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Journal articles on the topic 'Thermography'
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1
Kostrub, Oleksandr, Oleksandr Shukalo, Vadim Dunaevsky, Vitaliy Kotovsky, Volodymyr Tymofeiev, and Svitlana Nazarchuk. "Remote infrared thermography in the system of comprehensive diagnostics of the health of military personnel before surgical intervention." ORTHOPAEDICS TRAUMATOLOGY and PROSTHETICS, no. 1 (April 2, 2025): 5–12. https://doi.org/10.15674/0030-5987202515-12.
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A complete and informative diagnosis of the general health of military personnel before surgical intervention is of great importance for its successful implementation. A simple and affordable diagnostic method of radiological diagnostics is the method of remote infrared thermography. Conducting a comprehensive thermographic examination of military personnel before surgical intervention allows for the treatment of those pathological conditions that were detected during the thermographic examination. Objective. To show the possibility and evaluate the diagnostic informativeness remote infrared thermography in the system of comprehensive diagnostic monitoring of the health of military personnel before surgical intervention; to obtain thermographic visualizations of detected pathological changes associated with participation in combat operations. Methods. The work used a domestic thermograph with a temperature sensitivity of 0.07 °C and a ThermaCAM thermograph E 300 FLIR SYSTEM. Observation and control of thermal fields were carried out in the ranges of 3÷5 μm and 8÷14 μm. The examination was carried out during inpatient and outpatient treatment. Results. Received thermographic visualizations detected pathologies: disorders functions breathing; thermal asymmetries zones projections lung because of COVID-19; complications after firearm injury — pneumothorax; zones hyperthermia temporal bones due to contusion; vascular pattern disorders in the thyroid gland; functional and chronic disorders organs gastrointestinal and urological pathologies; degenerativedystrophic musculoskeletal changes The oscillographic distributions of temperature patterns of the detected pathological conditions, which characterize the severity of traumatic and degenerative-dystrophic changes, were studied. Conclusions. In the presented work for the first time obtained and the results of a comprehensive thermographic health check-up military personnel after a long stay in the combat zone and before operational Remote infrared thermography, as one of the methods of radiological diagnostics, allows for a comprehensive examination of a significant number of military personnel in a short period of time and to identify pathological changes that require additional examination by narrowly specialized specialists.
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Ostafiychuk, D. I., and O. G. Shaiko-Shaikovsky. "Thermography and Thermometry in Medicine. The Importance and Use of Non-Invasive Methods in the Diagnostics of Certain Diseases." Journal of Thermoelectricity, no. 1 (March 31, 2025): 26–36. https://doi.org/10.63527/1607-8829-2025-1-26-36.
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Thermography and thermometry are modern diagnostic methods that are currently increasingly used in medical research due to their sufficient information content and non-invasiveness. The paper examines the possibilities of thermography in modern medical diagnostics, analyzes the literature on thermographic and thermometric research methods, and identifies the main areas of application of the method in medicine. The biophysical aspects of thermography, physiological and physical factors that influence the formation of thermographic and thermometric diagnostics have been identified.
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Zhou, Jian Min, Jun Yang, and Qi Wan. "Review on Non-Destructive Testing Technique of Eddy Current Pulsed Thermography." Applied Mechanics and Materials 742 (March 2015): 128–31. http://dx.doi.org/10.4028/www.scientific.net/amm.742.128.
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This paper introduces the theory of eddy current pulsed thermography and expounds the research status of eddy current pulsed thermography in application and information extraction. Thermographic signal reconstruction, pulsed phase thermography, principal component analysis were introuduced in this paper and listed some fusion multiple methods to acquire information from infrared image. At last, it summarizes research progress, existing problem and deelopment of eddy current pulsed thermography.
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Oe, Makoto, Rie Roselyne Yotsu, Hiromi Sanada, Takashi Nagase, and Takeshi Tamaki. "Screening for Osteomyelitis Using Thermography in Patients with Diabetic Foot." Ulcers 2013 (March 31, 2013): 1–6. http://dx.doi.org/10.1155/2013/284294.
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One of the most serious complications of diabetic foot (DF) is osteomyelitis, and early detection is important. To assess the validity of thermography to screen for osteomyelitis, we investigated thermographic findings in patients with both DF and osteomyelitis. The subjects were 18 diabetic patients with 20 occurrences of DF who visited a dermatology department at a hospital in Tokyo and underwent evaluation by magnetic resonance imaging (MRI) and thermography between June 2010 and July 2012. Osteomyelitis was identified by MRI. Thermographs were taken of the wounds and legs after bed rest of more than 15 minutes. Two wound management researchers evaluated the range of increased skin temperature. There were three types of distribution of increased skin temperature: the periwound, ankle, and knee patterns. Fisher’s exact test revealed that the ankle pattern was significantly more common in the group with osteomyelitis than in the group without osteomyelitis (P=0.011). The positive predictive value was 100%, and the negative predictive value was 71.4%. Our results suggest that an area of increased skin temperature extending to the ankle can be a sign of osteomyelitis. Thermography might therefore be useful for screening for osteomyelitis in patients with DF.
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Nurhandayani, Lenny, Sri Andarini, and Heri Kristianto. "DIABETIC FOOT: A SCOPING REVIEW OF NEUROSENSORIC DISORDERS – THERMOGRAPHY." Jurnal Health Sains 4, no. 7 (2023): 19–25. http://dx.doi.org/10.46799/jhs.v4i7.1006.
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Background: Diabetic foot is a chronic complication that can be detrimental and has an impact on the quality of life of diabetic patients. Neurosensory examination of skin temperature using a thermograph can help prevent diabetic foot. Objective: to identify the neurosensory examination of skin temperature using infrared thermographs in addressing the risk of diabetic foot Design: The design in this study is Scoping review Methods: A journal search was conducted using the keywords "infrared thermography, screening or assessment, diabetic foot, and meta-analysis" to collect relevant articles published in the last ten years from four databases (ProQuest, PubMed, ScienceDirect, and Google Scholar). The inclusion criteria were: nurses, patients, diabetic foot, assessment, full-text articles, studies focusing on nursing issues, and written in English. Four journal articles were selected and analyzed using PICO. Results: Four meta-analysis articles on neurosensory examination of skin temperature sensitivity using a thermograph have a p value < 0.05, which can support clinical nursing for monitoring diabetic foot prevention. Conclusion: Examination of skin temperature sensation using a thermograph can be used as a method for neurosensory assessment in monitoring nursing care for structural integrity problems in the physiological changes of the diabetic foot.
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Popardovská, Eva, and Vladimír Popardovský. "Active Thermografy as a Method for Non-destructive Testing of Polymer Composite Materials." Science & Military 16, no. 2 (2021): 5–9. http://dx.doi.org/10.52651/sam.a.2021.2.5-9.
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Infrared (IR) thermography is a method for imaging thermal fields on the target surfaces in real time. It is a noncontact and non-destructive method of obtaining thermogram of tested material surface or inside of it. We can divide the IR thermographic testing methods into two basic groups – passive and active thermography. This article introduces a basic overview of IR active thermography.
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Yang, B., P. K. Liaw, J. Y. Huang, R. C. Kuo, J. G. Huang, and D. E. Fielden. "Stress Analyses and Geometry Effects During Cyclic Loading Using Thermography." Journal of Engineering Materials and Technology 127, no. 1 (2005): 75–82. http://dx.doi.org/10.1115/1.1836793.
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A high-speed and high-sensitivity thermographic-infrared (IR) imaging system has been used to investigate the temperature evolutions of SA533B1 steel specimens during high-cycle fatigue experiments. Both thermodynamics and heat-transfer theories are applied to quantify the relationship between the observed temperature variations and stress–strain states during fatigue. The thermoelastic effect has been utilized to calculate the maximum stress level during fatigue testing. The predicted results matched the experimental data quite well. Different temperature and strain behaviors have been observed between cylindrical and flat specimens during high-cycle fatigue experiments. Explanations have been provided, based on Lu¨ders band evolutions in flat specimens during fatigue, which have been observed in detail by thermography. Numerical methods have been provided to convert the temperature map (thermograph) into heat-dissipation-rate (HDR) map, which illustrates the kinetics of the Lu¨ders-band evolution. Thus, the thermography technology can provide an effective means to “watch” and “quantify” the heat-evolution processes, such as the mechanical-damage behaviors, which can open up new opportunities for in- situ studying mechanical and phase-transformation behaviors in detail.
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Wang, X. G., V. Crupi, X. L. Guo, and E. Guglielmino. "A thermography-based approach for structural analysis and fatigue evaluation." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 5 (2011): 1173–85. http://dx.doi.org/10.1177/0954406211421998.
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The infrared thermography has been developed for Non-Destructive Testing (NDT), stress analysis, and in the last 10 years for metal fatigue assessment. The present research enables to realize these different research objectives all together thanks to an innovative experimental procedure, which includes NDT by lock-in thermography, thermoelastic stress analysis, and fatigue parameters assessment by Rapid Thermographic Method ( RTM). The developed procedure has been performed on a set of hole-notched specimens, achieving good results and predictions in a relatively short time. Moreover, the fatigue strength reduction coefficients of the specimens were determined by RTM. This thermography-based approach is dedicated for structural analysis and fatigue evaluation; it is an interesting attempt to apply different thermographic methods to a common research topic.
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Livada, Časlav, Hrvoje Glavaš, Alfonzo Baumgartner, and Dina Jukić. "The Dangers of Analyzing Thermographic Radiometric Data as Images." Journal of Imaging 9, no. 7 (2023): 143. http://dx.doi.org/10.3390/jimaging9070143.
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Thermography is probably the most used method of measuring surface temperature by analyzing radiation in the infrared part of the spectrum which accuracy depends on factors such as emissivity and reflected radiation. Contrary to popular belief that thermographic images represent temperature maps, they are actually thermal radiation converted into an image, and if not properly calibrated, they show incorrect temperatures. The objective of this study is to analyze commonly used image processing techniques and their impact on radiometric data in thermography. In particular, the extent to which a thermograph can be considered as an image and how image processing affects radiometric data. Three analyzes are presented in the paper. The first one examines how image processing techniques, such as contrast and brightness, affect physical reality and its representation in thermographic imaging. The second analysis examines the effects of JPEG compression on radiometric data and how degradation of the data varies with the compression parameters. The third analysis aims to determine the optimal resolution increase required to minimize the effects of compression on the radiometric data. The output from an IR camera in CSV format was used for these analyses, and compared to images from the manufacturer’s software. The IR camera providing data in JPEG format was used, and the data included thermographic images, visible images, and a matrix of thermal radiation data. The study was verified with a reference blackbody radiation set at 60 °C. The results highlight the dangers of interpreting thermographic images as temperature maps without considering the underlying radiometric data which can be affected by image processing and compression. The paper concludes with the importance of accurate and precise thermographic analysis for reliable temperature measurement.
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Kaur, K., A. Sharma, A. Rani, V. Kher, and R. Mulaveesala. "Physical insights into principal component thermography." Insight - Non-Destructive Testing and Condition Monitoring 62, no. 5 (2020): 277–80. http://dx.doi.org/10.1784/insi.2020.62.5.277.
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Among widely used non-destructive testing (NDT) methods, infrared thermography (IRT) has gained importance due to its fast, whole-field, remote and quantitative inspection capabilities for the evaluation of various materials. Being fast and easy to implement, pulsed thermography (PT) plays a vital role in the infrared thermographic community. This paper provides a physical insight into the selection of empirical orthogonal functions obtained from principal component pulsed thermography for the detection of subsurface defects located inside a mild steel specimen.
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Cabizosu, Alessio, Daniele Grotto, Alberto López López, and Raúl Castañeda Vozmediano. "Thermography Sensor to Assess Motor and Sensitive Neuromuscular Sequels of Brain Damage." Sensors 24, no. 6 (2024): 1723. http://dx.doi.org/10.3390/s24061723.
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Introduction. The aim of this study was to observe the validity, diagnostic capacity, and reliability of the thermographic technique in the analysis of sensitive and motor sequelae in patients with chronic brain damage. Method. A longitudinal descriptive observational study was performed. Forty-five people with impairment in at least one anatomical region participated in and completed this study. All patients who had become infected by SARS-CoV-2 in the past year were excluded. Thermographic measurement was conducted, and the Modified Ashworth Scale and Pressure Pain Threshold was analyzed. Results. A high correlation between two times of thermography data was observed. The Spearman correlations obtained between the Ashworth score on each leg and the temperature given by thermography were all significant. Discussion and conclusions. Despite the above, the Spearman correlations obtained between the PPT in each leg and the temperature offered by thermography were not significant in any of the measurements. For this reason, thermography is a potential tool for the diagnosis and assessment of neuromuscular motor sequelae, but not for sensitive sequelae, after brain injury. Nevertheless, for the time being, no statistical relationship has been observed between the data reported by thermography and PPT; thus, future studies are needed to further investigate these results.
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Morozov, A. M., E. M. Mokhov, V. A. Kadykov, and A. V. Panova. "Medical thermography: capabilities and perspectives." Kazan medical journal 99, no. 2 (2018): 264–70. http://dx.doi.org/10.17816/kmj2018-264.
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Medical thermography is a modern diagnostic method that is currently gaining popularity due to high informative value and non-invasiveness. The aim of the study was to review the capabilities and prospects of medical thermography in modern medicine. The analysis of domestic and foreign literature on the application of medical thermography methods for the period of 2012-2017 was performed. The article presents the capabilities of imaging in various fields of medicine, evaluates the prospects of further development of the method, advances and disadvantages of thermography were identified. It also provides the review of the application of medical infrared thermography in clinical medicine. The experience of thermography application in various medical fields was investigated: angiology, otolaryngology, surgery, neurology, obstetrics and gyenecology, etc. Apart from medical aspects of this topic, the article discusses the history of medical thermography as well as provides the physical principles of this method. At present, thermal imaging can solve a wide range of problems: determining the presence of changes in the human body, and, as a result, the probability of pathology development, monitoring the effectiveness of treatment and rehabilitation. Every year more and more studies are carried out, confirming the high efficiency, reliability and safety of thermography, thermographic screenings are suggested, that can be assumed as prediction of future method's popularity.
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Mineo, Carmelo, Nicola Montinaro, Mario Fustaino, Antonio Pantano, and Donatella Cerniglia. "Fine Alignment of Thermographic Images for Robotic Inspection of Parts with Complex Geometries." Sensors 22, no. 16 (2022): 6267. http://dx.doi.org/10.3390/s22166267.
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Increasing the efficiency of the quality control phase in industrial production lines through automation is a rapidly growing trend. In non-destructive testing, active thermography techniques are known for their suitability to allow rapid non-contact and full-field inspections. The robotic manipulation of the thermographic instrumentation enables the possibility of performing inspections of large components with complex geometries by collecting multiple thermographic images from optimal positions. The robotisation of the thermographic inspection is highly desirable to improve assessment speed and repeatability without compromising inspection accuracy. Although integrating a robotic setup for thermographic data capture is not challenging, the application of robotic thermography has not grown significantly to date due to the absence of a suitable approach for merging multiple thermographic images into a single presentation. Indeed, such an approach must guarantee accurate alignment and consistent pixel blending, which is crucial to facilitate defect detection and sizing. In this work, an innovative inspection platform was conceptualised and implemented, consisting of a pulsed thermography setup, a six-axis robotic manipulator and an algorithm for image alignment, correction and blending. The performance of the inspection platform is tested on a convex-shaped specimen with artificial defects, which highlights the potential of the new combined approach. This work bridges a technology gap, making thermographic inspections more deployable in industrial environments. The proposed fine image alignment approach can find applicability beyond thermographic non-destructive testing.
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Mehr, Katarzyna, and Teresa Matthews-Brzozowska. "Thermographic profile of the face before treatment with autologous preparation: a preliminary report." Journal of Face Aesthetics 6, no. 2 (2023): 107–11. http://dx.doi.org/10.20883/jofa.75.
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The paper presents a thermographic image of the face of a 30-year-old patient before an autologous procedure using her own blood (CGF-Harmony) in the upper and middle parts of the face. The thermographic method is non-invasive, safe and non-contact. The possibility of using thermography in aesthetic medicine is important because it brings certain values, but one should be aware of the existence of certain limitations in thermography tests, resulting from many factors such as diet, use of various cosmetics, other environmental conditions and others.
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Amarandei, Mihaela, Karla Berdich, Izabella Szigyarto, Lorand Kun, and Liviu Marşavina. "Nondestructive Evaluation of Polyurethane Materials Using Transient Thermography." Key Engineering Materials 525-526 (November 2012): 21–24. http://dx.doi.org/10.4028/www.scientific.net/kem.525-526.21.
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The aim of this work is to investigate the potential of transient thermography in the nondestructive evaluation of structural defects of NECURON 1001 using the FLIR thermographic system. Necuron is a polyurethane material used for applications like: fixture and gauges, master and copy models, models with high mechanical stress, etc. Transient thermography is a thermographic method which implies the investigation of materials that are of a different (often higher) temperature than the ambient. The heat flow into the sample is altered in the presence of a subsurface defect or feature, creating a temperature contrast at the surface that is recorded by the infrared system. Results show that this method of evaluation can indicate, in necuron, defects of small sizes that can be overlooked in the manufacturing process. Also, it was shown that the transient thermography method presented can be an important tool in evaluating structural defects of materials.
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Ciatto, Stefano, Marco Rosselli Del Turco, Silvia Cecchini, Grazia Grazzini, and Anna Iossa. "Telethermography and Breast Cancer Risk Prediction." Tumori Journal 75, no. 2 (1989): 110–12. http://dx.doi.org/10.1177/030089168907500206.
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The authors report on 4,624 noncancer women classified by telethermography (TH1-2 vs TH3) and followed for an average of 6.6 years (range, 2–12). Breast cancer occurring beyond the sixth month from TH were recorded according to a Cancer Registry, and the association between breast cancer incidence and thermographic class or patient age was evaluated. Univariate analysis showed a significant association of age and thermography with further cancer incidence, but multivariate analysis (Cox's model) confirmed a significant association only for age. Thermography (TH3) showed a nonsignificant odds ratio of 1.6 with respect to TH1-2 cases. Thus thermography did not show any practical role as a breast cancer risk indicator. Possible biases affecting previous reports suggesting the use of thermography as a breast cancer risk indicator are discussed.
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Mayer, Z., A. Epperlein, R. Volk, E. Vollmer, and F. Schultmann. "Comparison of building thermography approaches using terrestrial and aerial thermographic images." IOP Conference Series: Earth and Environmental Science 1078, no. 1 (2022): 012026. http://dx.doi.org/10.1088/1755-1315/1078/1/012026.
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Abstract Thermography is commonly used for auditing buildings. Classical manual terrestrial thermography records images of individual buildings at a short distance. When auditing a large number of buildings (e.g. whole city districts) this approach reaches its limits. Using drones with thermographic cameras allows images to be recorded automatically from different angles, with faster speed and without violating property rights. However, an airborne camera has a significantly greater distance and more varied angles to a building compared to terrestrial thermography. To investigate the influence of these factors for building auditing, we perform a study evaluating seven different drone settings of varying flight speed, angle, and altitude. A comparison is drawn to manually recorded terrestrial thermographic images. While we find that a flight speed between 1m/s and 3m/s does not influence the thermographic quality, high flight altitudes and steep viewing angles lead to a significant reduction of visible details, contrast, and to falsified temperatures. A flight altitude of 12m over buildings is found to be the most suitable for the qualitative and quantitative analysis of rooftops and a qualitative analysis of façades. A flight altitude of 42m over buildings can only be used for qualitative audits with little detail.
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Wen, Ching-Mei, Stefano Sfarra, Gianfranco Gargiulo, and Yuan Yao. "Edge-Group Sparse Principal Component Thermography for Defect Detection in an Ancient Marquetry Sample." Proceedings 27, no. 1 (2019): 34. http://dx.doi.org/10.3390/proceedings2019027034.
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Nondestructive inspection (NDI) has immensely contributed to the restoration of historic and artistic works. As one of the most common used NDI methods, active thermography is an easy-to-operate and efficient technique. Principal component thermography (PCT) has been widely used to deal with thermographic data for enhancing the visibility of subsurface defects. Unlike PCT, edge-group sparse PCT introduced herein enforces sparsity of principal component (PC) loadings by considering the spatial connectivity of thermographic image pixels. The feasibility and effectiveness of this method is illustrated by the experimental results of the defect characterization in an ancient marquetry sample with a fir wood support.
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Nowakowski, Antoni. "Problems of Active Dynamic Thermography Measurement Standardization in Medicine." Pomiary Automatyka Robotyka 25, no. 3 (2021): 51–56. http://dx.doi.org/10.14313/par_241/51.
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Reliability of thermographic diagnostics in medicine is an important practical problem. In the field of static thermography, a great deal of effort has been made to define the conditions for thermographic measurements, which is now the golden standard for such research. In recent years, there are more and more reports on dynamic tests with external stimulation, such as Active Dynamic Thermography, Thermographic Signal Reconstruction or Thermal Tomography. The subject of this report is a discussion of the problems of standardization of dynamic tests, the choice of the method of thermal stimulation and the conditions determining the credibility of such tests in medical diagnostics. Typical methods of thermal stimulation are discussed, problems concerning accuracy and control of resulting distributions of temperature are commented. The best practices to get reliable conditions of measurements are summarized.
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Kenedi, Paulo P., Lucas L. Vignoli, Brenno T. Duarte, Jorge de Souza e Silva Neto, and Carlos F. Cardoso Bandeira. "Damage tracking of notched composite plates by thermography—Experimental observations and analytical model for damage onset." Journal of Composite Materials 56, no. 8 (2022): 1211–20. http://dx.doi.org/10.1177/00219983211072297.
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The thermographic approach is a non-contact/full field technique that can be used to recognize surface damages that generates small sudden heatings. The load monitoring can be used, associated with thermography, to quantify the resistance loss synchronized with surface localized temperature changes. An experimental arrangement was set up to test notched composites specimens subjected to progressive axial load, up to the final failure. The results show that the utilization of the passive thermography, together with the resistance curves, as complementary procedure, can become a helpful tool to evaluate damage tolerance for design of composite applications. Additionally, an analytical model was proposed to estimate damage onset, resulting in good agreements with thermography first heating event.
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Noronha, Jéssica Hálice, Denise Sabbagh Haddad, Emiko Saito Arita, and Eduardo Borba Neves. "Thermography in dentistry: a bibliometric review / Termografia em odontologia: uma revisão bibliométrica." Brazilian Journal of Health Review 5, no. 2 (2022): 5049–72. http://dx.doi.org/10.34119/bjhrv5n2-092.
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Infrared thermography is an imaging exam present in the scope of diagnosis, evolutionary monitoring, and prognosis in the health area. Over the years, thermography has been studied in medicine, and it is a technique recently used in Dentistry. In this sense, the objective of this work was to carry out a literature review with a bibliometric approach to the use of thermal images for the diagnosis/monitoring of dental treatments. Studies that relate thermography to dental specialties were analyzed, considering the use of thermography as a diagnostic aid and monitoring of dental treatments in its wide range of activities. Searches were performed in the following databases: PubMed, Web of Science, Embase, Scopus, Scielo, from 1985 to 2020, with a search phrase including thermography and Dentistry specialties. The results show the trends in publications relating thermographic images to dental specialties by year of publication, journals, country, type of study, manufacturer of cameras used, resolution, and ambient temperature, totaling 119 publications in 83 journals. Temporomandibular Dysfunction and Orofacial Pain was the specialty with the highest concentration of publications relating thermography to Dentistry (27 articles). Endodontics was the second specialty (23 articles), Restorative Dentistry was the third specialty (18 articles) followed by Surgery (17 articles). It can be concluded that thermography is indicated as an auxiliary diagnostic method in Dentistry specialties. The main indications for thermography in Dentistry are in the context of diagnosis of Orofacial Pain (dysfunctions temporomandibular disorders of the muscular and articular types, noninflammatory odontalgias and neuropathies), Endodontics (inflammatory odontalgias), Implantology (osseointegration), and follow-up evolution of the postoperative surgeries.
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Pieczonka, Łukasz, Mariusz Szwedo, and Tadeusz Uhl. "Investigation of the Effectiveness of Different Thermographic Testing Modalities in Damage Detection." Key Engineering Materials 558 (June 2013): 349–56. http://dx.doi.org/10.4028/www.scientific.net/kem.558.349.
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The paper deals with practical aspects of Thermographic Nondestructive Testing (TNDT). A comparative study of burst vibrothermography (VT) and pulsed thermography (PT) measurements is presented and discussed. The authors have developed a diagnostic system for thermographic testing of structures that was used to perform experiments. Supported test modalities include burst vibrothermography and pulsed thermography, among other techniques. The system comprises both hardware and software components facilitating TNDT inspections. Experimental testing has been performed, on a composite plate, using the developed diagnostic system and two of the supported test modalities. The goal of these investigations was to compare the performance of both TNDT methods in revealing Barely Visible Impact Damage (BVID) in a composite plate.
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Pavelski, Mariana, Mardjory da Silva Basten, Eduarda Busato, and Peterson Triches Dornbusch. "Infrared thermography evaluation from the back region of healthy horses in controlled temperature room." Ciência Rural 45, no. 7 (2015): 1274–79. http://dx.doi.org/10.1590/0103-8478cr20140675.
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The infrared thermography is a diagnostic imaging tool, which measures the surface temperature of an object through its heat emission. It is a non-invasive method, painless, with no involvement of radiation. Horses have elevated incidence of back injuries which causes decrease in their performance. A rapid and accurate diagnostic is essential to start the treatment. The aim of this paper was to establish the ideal time to the animal stay e inside a controlled room to balance their temperature and in the second time verify the thermographic temperature of specific back regions. It was studied fifteen healthy horses, being performed thermography of thoracic, lumbar and pelvic regions in four different times. There was a significant difference between the thermography performed outside and inside of the controlled temperature room. It was concluded that the ideal time to the horse stay into the controlled temperature room was thirty minutes and the mean thermographic temperatures of back regions, were obtained and can be used as parameters to identify injuries in other horses.
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Muzika, Lukáš, Jiří Tesař, Michal Švantner, Jiří Skála, and Petra Honnerová. "Comparison of Methods for Emissivity Influence Suppression on Thermographic Data." Buildings 13, no. 1 (2022): 69. http://dx.doi.org/10.3390/buildings13010069.
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Emissivity is a crucial parameter for a quantitative thermography measurement. It influences measured temperature using an infrared camera. Typically, the emissivity is handled by infrared camera software but often for more complex tasks—e.g., setting and controlling the emissivity of individual pixels—a custom-made solution must be created. This can be especially beneficial for active thermography measurement and dynamic building inspection by infrared thermography as many surfaces of interest with different emissivity occur in thermographic data. In literature, one technique for suppressing emissivity occurs most often—the technique used by infrared camera manufacturers. Nonetheless, two other techniques are marginally mentioned. The most complex technique is the one used by infrared camera manufacturers, which allows many parameters to be set, but it is difficult to incorporate it into own solution. In contrast, the second one can be adapted easily, and it uses the relationship between emissivity and the fourth power of temperatures. The third one is a scarcely used technique that occurs for some active thermography measurements, in which a thermographic sequence in counts is divided by a frame when temperature equilibrium is reached. The main goal of this article is to compare these individual techniques from the point of view of the accuracy and possibility of use. The experiment showed that all three methods can be successfully used for the suppression of emissivity influence.
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Figueredo, Antonio, Mauro Azevedo, Paula Da Silveira, et al. "Infrared thermography as a complementary tool in dental." Concilium 23, no. 10 (2023): 445–53. http://dx.doi.org/10.53660/clm-1398-23f31.
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Infrared cameras have the ability to measure infrared radiation, resulting in the generation of thermal images where each pixel refers to a different temperature value. Thermographic images allow measuring the thermal variations that can be used to obtain physiological information. This study aimed to analyze the applications of thermography in dentistry through an integrative literature review. This work is the result of research carried out in the following databases: Virtual Health Library (VHL), PubMed, Ebsco and ScienceDirect. The following descriptors “thermography”, “dentistry” and “diagnosis were used, and 13 articles were selected to compose this work. This integrative review allowed analyzing, through several studies, the clinical applications of thermography in dentistry. Because it is a non-invasive method, this technique has a promising future in dentistry. Therefore, based on the studies already published and analyzed, it can be concluded that infrared thermography is an auxiliary tool in dental diagnosis and useful for monitoring and examining therapeutic interventions.
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Oe, Makoto, Kahori Tsuruoka, Yumiko Ohashi, et al. "Prevention of diabetic foot ulcers using a smartphone and mobile thermography: a case study." Journal of Wound Care 30, no. 2 (2021): 116–19. http://dx.doi.org/10.12968/jowc.2021.30.2.116.
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Objective: Early identification of pre-ulcerative pathology is important to preventing diabetic foot ulcers (DFU), but signs of inflammation are difficult to detect on the feet of patients with diabetic neuropathy due to decreased sensation. However, infrared thermography can objectively identify inflammation. Therefore, a device that allows patients to visualise thermograms of their feet might be an effective way to prevent DFU. We aimed to determine the effects of a novel self-monitoring device to prevent DFU using a thermograph attached to a smartphone. Method: A self-monitoring device comprising a mobile thermograph attached to a smartphone on a selfie stick was created, and its effects in two patients with diabetic neuropathy and foot calluses assessed. Results: For one patient, he understood that walking too much increased the temperature in the skin of his feet (a sign of inflammation). The other patient could not detect high-risk findings, because the temperature of his skin did not increase during the study period. Conclusion: This device might provide self-care incentives to prevent DFU, although some issues, such as the automatic detection of high-risk thermographic changes, need to be improved.
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PRACHT, Monika, and Waldemar ŚWIDERSKI. "Experimental Testing of Aramid Composite Applied in Ballistic Armour by Ultrasonic IR Thermography." Problems of Mechatronics Armament Aviation Safety Engineering 10, no. 2 (2019): 79–88. http://dx.doi.org/10.5604/01.3001.0013.2117.
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Reference samples, in which artificial discontinuities (defects) are fabricated, are used to verify non-destructive testing procedures. Artificial discontinuities are known defects of reference samples and enable verification the feasibility of the verified NDT method for the identification of location and depth of discontinuities. Thermographic inspection of reference samples also helps to determine the required thermal input source parameters to test samples. This paper presents the results of experimental testing for ultrasonic IR thermography of defects in aramid composite laminate intended for light ballistic armour. Specimens of the aramid composite material included artificial defects and were inspected at various ultrasonic frequencies. Optical thermography and X-ray inspection were carried out on the same specimens, and their results were compared to those determined with ultrasonic IR thermography.
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Moustakidis, Serafeim, Athanasios Anagnostis, Apostolos Chondronasios, Patrik Karlsson, and Kostas Hrissagis. "Excitation-invariant pre-processing of thermographic data." Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability 232, no. 4 (2018): 435–46. http://dx.doi.org/10.1177/1748006x18770888.
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There is a large number of industries that make extensive use of composite materials in their respective sectors. This rise in composites’ use has necessitated the development of new non-destructive inspection techniques that focus on manufacturing quality assurance, as well as in-service damage testing. Active infrared thermography is now a popular nondestructive testing method for detecting defects in composite structures. Non-uniform emissivity, uneven heating of the test surface, and variation in thermal properties of the test material are some of the crucial factors in experimental thermography. These unwanted thermal effects are typically coped with the application of a number of well-established thermographic techniques including pulse phase thermography and thermographic signal reconstruction. This article addresses this problem of the induced uneven heating at the pre-processing phase prior to the application of the thermographic processing techniques. To accomplish this, a number of excitation invariant pre-processing techniques were developed and tested in this article addressing the unwanted effect of non-uniform excitation in the collected thermographic data. Various fitting approaches were validated in light of modeling the non-uniform heating effect, and new normalization approaches were proposed following a time-dependent framework. The proposed pre-processing techniques were validated on a testing composite sample with pre-determined defects. The results demonstrated the effectiveness of the proposed processing algorithms in terms of removing the unwanted heat distribution effect along with the signal-to-noise ratio of the produced infrared images.
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Tu, Katherine, Clemente Ibarra-Castanedo, Stefano Sfarra, Yuan Yao, and Xavier P. V. Maldague. "Multiscale Analysis of Solar Loading Thermographic Signals for Wall Structure Inspection." Sensors 21, no. 8 (2021): 2806. http://dx.doi.org/10.3390/s21082806.
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Infrared thermography has been widely adopted in many applications for material structure inspection, where data analysis methods are often implemented to elaborate raw thermal data and to characterize material structural properties. Herein, a multiscale thermographic data analysis framework is proposed and applied to building structure inspection. In detail, thermograms are first collected by conducting solar loading thermography, which are then decomposed into several intrinsic mode functions under different spatial scales by multidimensional ensemble empirical mode decomposition. At each scale, principal component analysis (PCA) is implemented for feature extraction. By visualizing the loading vectors of PCA, the important building structures are highlighted. Compared with principal component thermography that applies PCA directly to raw thermal data, the proposed multiscale analysis method is able to zoom in on different types of structural features.
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Wu, Cui Qin, Wei Ping Wang, Qi Gang Yuan, Yan Jun Li, Wei Zhang, and Xiang Dong Zhang. "Infrared Thermography Non-Destructive Testing of Composite Materials." Advanced Materials Research 291-294 (July 2011): 1307–10. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1307.
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To detect the delamination, disbond，inclusion defects of the glass fiber composite materials applied in the solid rocket motor, active infrared thermographic non-destructive testing(NDT) is researched. The samples including known defects are heated by pulsed high energy flash lamp. The surface temperature of the samples is monitored by infrared thermography camera. The results of the experiments show that the active infrared thermography technique is a fast and effective inspection method for detecting the defects of delamination, disbond，inclusion of the composites. The samples are also detected by underwater ultrasonic c-scans. The paper concludes that the active infrared thermography NDT is more suitable to rapidly detect the defect in large-area and the underwater ultrasonic c-scans is more suitable to quantitatively identify the defect in local-area.
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CHOI, SEUNG-HYUN, SOO-KEUN PARK, and JAE-YEOL KIM. "NDE OF ADVANCED AUTOMOTIVE COMPOSITE MATERIALS THAT APPLY ULTRASOUND INFRARED THERMOGRAPHY TECHNIQUE." International Journal of Modern Physics: Conference Series 06 (January 2012): 515–20. http://dx.doi.org/10.1142/s2010194512003704.
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The infrared thermographic nondestructive inspection technique is a quality inspection and stability assessment method used to diagnose the physical characteristics and defects by detecting the infrared ray radiated from the object without destructing it. Recently, the nondestructive inspection and assessment that use the ultrasound-infrared thermography technique are widely adopted in diverse areas. The ultrasound-infrared thermography technique uses the phenomenon that the ultrasound wave incidence to an object with cracks or defects on its mating surface generates local heat on the surface. The car industry increasingly uses composite materials for their lightweight, strength, and environmental resistance. In this study, the car piston passed through the ultrasound-infrared thermography technique for nondestructive testing, among the composite material car parts. This study also examined the effects of the frequency and power to optimize the nondestructive inspection.
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D’Accardi, Ester, Davide Palumbo, Rosanna Tamborrino, and Umberto Galietti. "A Quantitative Comparison Among Different Algorithms for Defects Detection on Aluminum with the Pulsed Thermography Technique." Metals 8, no. 10 (2018): 859. http://dx.doi.org/10.3390/met8100859.
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Pulsed thermography is commonly used as a non-destructive technique for evaluating defects within materials and components. In the last few years, many algorithms have been developed with the aim to detect defects and different methods have been used for detecting their size and depth. However, only few works in the literature reported a comparison among the different algorithms in terms of the number of detected defects, the time spent in testing and analysis, and the quantitative evaluation of size and depth. In this work, starting from a pulsed thermographic test carried out on an aluminum specimen with twenty flat bottom holes of known nominal size and depth, different algorithms have been used with the aim to obtain a comparison among them in terms of signal to background contrast (SBC) and number of detected defects by analyzing different time intervals. Moreover, the correlation between SBC and the aspect ratio of the defects has been investigated. The algorithms used have been: Pulsed Phase Thermography (PPT), Slope, Correlation Coefficient (R2), Thermal Signal Reconstruction (TSR) and Principal Component Thermography (PCT). The results showed the advantages, disadvantages, and sensitivity of the various thermographic algorithms.
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Sfarra, Stefano, Clemente Ibarra-Castanedo, Carlo Santulli, Domenica Paoletti, and Xavier Maldague. "Monitoring of jute/hemp fiber hybrid laminates by nondestructive testing techniques." Science and Engineering of Composite Materials 23, no. 3 (2016): 283–300. http://dx.doi.org/10.1515/secm-2013-0138.
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AbstractDamage following static indentation of jute/hemp (50 wt.% total fiber content) hybrid laminates was detected by a number of nondestructive testing (NDT) techniques, in particular, near (NIR) and short-wave (SWIR) infrared reflectography and transmittography, infrared thermography (IRT), digital speckle photography (DSP), and holographic interferometry (HI), to discover and evaluate real defects in a laminate with a complex structure. A comparative study between thermographic data acquired in the mid- (MWIR) and long-wave infrared (LWIR) spectrum bands, by pulsed (PT) and square pulse (SPT) thermography, is reported and analyzed. A thermal simulation by COMSOL® Multiphysics (COMSOL Inc., Burlington, MA, USA) to validate the heating provided is also added. The robust SOBI (SOBI-RO) algorithm, available into the ICALAB Toolbox (BSI RIKEN ABSP Lab, Hirosawa, Japan) and operating in the MATLAB® (The MathWorks, Inc., Natick, MA, USA) environment, was applied on SPT data with results comparable to the ones acquired by several thermographic techniques. Finally, segmentation operators were applied both to the NIR/SWIR transmittography images and to a characteristic principal component thermography (PCT) image (EOFs) to visualize damage in the area surrounding indentation.
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Roemer, J., L. Pieczonka, M. Juszczyk, and T. Uhl. "Nondestructive Testing of Ceramic Hip Joint Implants with Laser Spot Thermography." Archives of Metallurgy and Materials 62, no. 4 (2017): 2133–39. http://dx.doi.org/10.1515/amm-2017-0315.
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AbstractThe paper presents an application of laser spot thermography for damage detection in ceramic samples with surface breaking cracks. The measurement technique is an active thermographic approach based on an external heat delivery to a test sample, by means of a laser pulse, and signal acquisition by an infrared camera. Damage detection is based on the analysis of surface temperature distribution near the exciting laser spot. The technique is nondestructive, non-contact and allows for full-field measurements. Surface breaking cracks are a very common type of damage in ceramic materials that are introduced in the manufacturing process or during the service period. This paper briefly discusses theoretical background of laser spot thermography, describes the experimental test rig and signal processing methods involved. Damage detection results obtained with laser spot thermography are compared with reference measurements obtained with vibrothermography. This is a different modality of active thermography, that has been previously proven effective for this type of damage. We demonstrate that both measurement techniques can be effectively used for damage detection and quality control applications of ceramic materials.
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de Carvalho, Gabriela, Carlos Eduardo Girasol, Luiz Guilherme Cruz Gonçalves, Elaine Caldeira Oliveira Guirro, and Rinaldo Roberto de Jesus Guirro. "Correlation between skin temperature in the lower limbs and biochemical marker, performance data, and clinical recovery scales." PLOS ONE 16, no. 3 (2021): e0248653. http://dx.doi.org/10.1371/journal.pone.0248653.
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The aim of this study was to evaluate the correlation between tools commonly used in the detection of physiological changes, such as clinical complaints, a biochemical marker of muscle injury, and performance data during official matches, with infrared thermography, which has been commonly used in the possible tracking of musculoskeletal injuries in athletes. Twenty-two athletes from a professional soccer club (age 27.7 ± 3.93 years; BMI 24.35 ± 1.80 kg/cm2) were followed during the season of a national championship, totaling 19 matches with an interval of 7 days between matches. At each match, the athletes used a Global Positioning System (GPS) device to collect performance data. Forty-eight hours after each match, every athlete’s perception of recovery, fatigue, and pain was documented. Blood was collected for creatine kinase (CK) analysis, and infrared thermography was applied. Only athletes who presented pain above 4 in either limb were included for thermographic analysis. Each thermographic image was divided into 14 regions of interest. For statistical analysis, we included only the images that showed differences ≥ 1° C. Data normality was verified by the Kolmogorov-Smirnov test with Dallal-Wilkinson-Lilliefors correction. We used the Pearson correlation coefficient to verify the correlation between infrared thermography and the biochemical marker, performance data, and clinical recovery scales. No correlation was observed between mean skin temperature and blood CK levels, pain level, perception of recovery, and fatigue perception (r <0.2, p>0.05). Thus, infrared thermography did not correlate with CK level, pain, fatigue perception, or recovery, nor with performance variables within the field.
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Farmaki, Spyridoula, Dimitrios A. Exarchos, Ilias K. Tragazikis, Theodore E. Matikas, and Konstantinos G. Dassios. "A Novel Infrared Thermography Sensing Approach for Rapid, Quantitative Assessment of Damage in Aircraft Composites." Sensors 20, no. 15 (2020): 4113. http://dx.doi.org/10.3390/s20154113.
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The current necessity of the scientific and industrial community, for reduction of aircraft maintenance cost and duration, prioritizes the need for development of innovative nondestructive techniques enabling fast and reliable defect detection on aircraft fuselage and wing skin parts. Herein, a new low-cost thermographic strategy, termed Pulsed Phase-Informed Lock-in Thermography, operating on the synergy of two independent, active infrared thermography techniques, is reported for the fast and quantitative assessment of superficial and subsurface damage in aircraft-grade composite materials. The two-step approach relies on the fast, initial qualitative assessment, by Pulsed Phase Thermography, of defect location and the identification of the optimal material-intrinsic frequency, over which lock-in thermography is subsequently applied for the quantification of the damage’s dilatational characteristics. A state-of-the-art ultra-compact infrared thermography module envisioned to form part of a fully-automated autonomous nondestructive testing inspection solution for aircraft was conceived, developed, and tested on aircraft-grade composite specimens with impact damages induced at variable energy levels and on a full-scale aircraft fuselage skin composite panel. The latter task was performed in semi-automated mode with the infrared thermography module mounted on the prototype autonomous vortex robot platform. The timescale requirement for a full assessment of damage(s) within the sensor’s field of view is of the order of 60 s which, in combination with the high precision of the methodology, unfolds unprecedented potential towards the reduction in duration and costs of tactical aircraft maintenance, optimization of efficiency and minimization of accidents.
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Harumi Seino, Caroline, Rodolfo Santos Rossi, Juliana Aparecida Bombardelli, et al. "Evaluation of body temperature by infrared thermography in calves under different thermal states." Acta Veterinaria Brasilica 18, no. 2 (2024): 179–85. http://dx.doi.org/10.21708/avb.2024.18.2.12411.
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The first 30 days of calves' life is a critical period for dairy farming due to the incidence of diseases that can result in high rates of mortality and morbidity. Fever is an early clinical sign of illness; however, the use of a rectal thermometer to measure body temperature in large herds is impractical. Research using a thermographic camera has demonstrated the availability of obtaining the superficial temperature without contact the evaluated local. The objective of this study was to evaluate the use of infrared thermography to measure body temperature in calves ≤ 30 days old, identifying the body regions that present a high correlation between superficial infrared temperature (IRT) and rectal temperature. Nineteen Holstein calves were enrolled in this study. An infrared thermography camera was used to obtain thermographic images of the following body regions: hooves, eyes, forehead, muzzle, and mouth. Thermographic images were obtained at 3, 5, 10±2, 15±2 , 20±2, 25±2, and 30±2 days after birth. Maximum (Tmax), minimum (Tmin), and mean (Tmean) temperatures were obtained for each body region. Calves were categorized as hyperthermic or euthermic animals based on rectal temperature. Correlations between IRT and rectal temperature varied according to each body region and rectal temperature category. The maximum temperatures of left and right eyes measured by infrared thermography showed a higher correlation with rectal temperature, regardless of rectal temperature category (hyperthermia or euthermia). In general, Tmax and Tmean had a higher correlation with rectal temperatures than Tmin.
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Elizalde, Rubén Rodríguez. "Assessment of Architectural Heritage and Historic Structures Through Aerial Thermography." Revista de Gestão Social e Ambiental 18, no. 10 (2024): e08761. http://dx.doi.org/10.24857/rgsa.v18n10-105.
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Objective: The objective of this study is to verify the applicability of aerial thermography as a complement to common inspections in the heritage field, assessing what it can contribute as a complement to such exclusively visual inspections. Theoretical Framework: The contribution of terrestrial thermography and aerial thermography to the heritage field is briefly presented, justifying the limitations of terrestrial thermography and the advantages of aerial thermography. Method: Within the framework of this research, the inspection was carried out, with a drone with a thermographic camera, on three unique elements of great heritage relevance, previously visually inspected by a drone with a photographic camera: the Roman Bridge of Alcántara, the Aqueduct of Segovia and the Roman Bridge of Alconétar. Results and Discussion: The results obtained in the inspections carried out allow us to draw the first conclusions on the applicability of this technology to architectural heritage: the inspections will demonstrate the usefulness of thermography for the diagnosis of lesions on stone that do not occur at a superficial level. . Implications of the Research: The usefulness of thermography for the diagnosis of lesions on stone that do not occur at a superficial level and that, when they appear on the surface, are already at an advanced stage of development inside the element. Early detection of such lesions can be key when trying to adopt early therapies that are less aggressive and costly, thus avoiding further damage to the constituent elements of the monument to be protected. Originality/Value: This study contributes to verifying the use of microtechnology tools that speed up the control and monitoring processes of damaging phenomena, eliminating the risks to the safety and health of workers and considerably reducing the risks to the architectural monument to be inspected.
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Kavuru, Manogna, and Elisabetta Rosina. "Developing Guidelines for the Use of Passive Thermography on Cultural Heritage in Tropical Climates." Applied Sciences 10, no. 23 (2020): 8411. http://dx.doi.org/10.3390/app10238411.
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Infrared thermography (IRT) has been a very successful tool for the diagnosis and monitoring of cultural heritage restoration projects. It has been used to identify anomalies, moisture issues, etc., in historic buildings. Although it is a promising tool, one of the limitations is that a method to deploy it onsite has not been standardized. This is due to the different variables that might affect thermal signatures captured by the thermal camera, when onsite. Especially since environmental conditions play a major role in thermography, the process must vary from region to region significantly. That said, efforts have been made over the years to establish some base standards for designated purposes of infrared thermography in the construction field. These standards and best practice methods, although comprehensive, do not effectively help with issues that are contextual to the location of the building, for instance, tropical climates, such as India. This paper aims to suggest guidelines for a passive approach of thermography, based on practical applications and procedures followed during the thermographic survey at the former British Residency in Hyderabad, India. Additionally, this paper explores the avenues through which region specific guidelines can be established.
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Kapcak, Ayse Basak, and Elif Dogan. "Short Communication: Correlation of Thermographic Ocular and Auricular Temperatures with Rectal Temperature in Anesthetized Dogs." Veterinary Medicine International 2023 (October 19, 2023): 1–6. http://dx.doi.org/10.1155/2023/9939580.
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Objective. The aim of this study was to determine the correlation of both ocular and auricular thermographic temperatures with rectal temperatures and to determine the advantage of infrared thermography in clinical practice due to its ease of measurement. Animals. This study was designed as a pilot study and conducted on 6 mongrel male dogs during routine castration surgeries at the Kastamonu Municipality Temporary Animal Care Center. Methods. Rectal temperatures and ocular-auricular thermographic images were taken from 6 dogs anesthetized (xylazine HCl 1 mg/kg and ketamine HCl 15 mg/kg) during routine neutering surgeries. Data were analyzed by Bland–Altman for correlation between rectal-ocular and rectal-auricular temperatures. Results. Rectal temperatures were significantly higher than orbital and auricular temperatures. In the correlation test, no significant difference and correlation were found between the measurements. Conclusion. As a result of the study, it was determined that the use of thermography was more advantageous than the waiting times of the digital thermometer used to record rectal temperatures. In addition, the noninvasive nature of thermography increased its acceptability in all dogs. The findings from this pilot study were considered to be at a level that could provide a basis for future studies.
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SCHAEFER, A. L., S. D. M. JONES, A. C. MURRAY, A. P. SATHER, and A. K. W. TONG. "INFRARED THERMOGRAPHY OF PIGS WITH KNOWN GENOTYPES FOR STRESS SUSCEPTIBILITY IN RELATION TO PORK QUALITY." Canadian Journal of Animal Science 69, no. 2 (1989): 491–95. http://dx.doi.org/10.4141/cjas89-056.
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Twenty five market-weight pigs averaging 92.0 kg body weight represented by eight halothane-negative with NN genotype, nine crossbred with Nn genotype and eight halothane-positive with nn genotype animals were thermographed to determine whether temperature differences were related to meat quality. Infrared thermograph analysis demonstrated no differences in mean external medial temperatures among genotypes in the live animal nor in the internal medial carcass surface. However, pigs with cooler mean side temperatures displayed a higher percent drip loss (P ≤ 0.09) and paler colored meat (P ≤ 0.03). This was particularly evident in the H+ pigs where a highly significant negative correlation between expressible juice (−0.87; P ≤ 0.01) as well as percent drip loss (−0.75; P ≤ 0.05) and mean live external medial surface temperature was observed. Furthermore, the halothane-positive pigs displayed small hot spots over the dorsal front shoulder area and over the posterior third of the animals. Key words: Infrared thermography, meat quality, pig genotype
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Hodorowicz-Zaniewska, Diana, Stefano Zurrida, Agnieszka Kotlarz, et al. "A Prospective Pilot Study on Use of Liquid Crystal Thermography to Detect Early Breast Cancer." Integrative Cancer Therapies 19 (January 2020): 153473542091577. http://dx.doi.org/10.1177/1534735420915778.
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Background: Breast cancer is the most common cancer in women. While mammography is the standard for early detection in women older than 50 years of age, there is no standard for younger women. The aim of this prospective pilot study was to assess liquid crystal contact thermography, using the Braster device, as a means for the early detection of breast cancer. The device is intended to be used as a complementary tool to standard of care (sonography, mammography, etc). Patients and Methods: A total of 274 consecutive women presenting at Polish breast centers for prophylactic breast examination were enrolled to receive thermography; 19 were excluded for errors in thermographic image acquisition. The women were divided according to age (n = 135, <50 years; n = 120, ≥50 years). A control population was included (n = 40, <50 years; n = 23, ≥50 years). The primary endpoint, stratified by age group, was the C-statistic for discrimination between breast cancer and noncancer. Results: In women with abnormal breast ultrasound (n = 95, <50 years; n = 87, ≥50 years), the C-statistic was 0.85 and 0.75, respectively ( P = .20), for discrimination between breast cancer and noncancer. Sensitivity did not differ ( P = .79) between the younger (82%) and older women (78%), while specificity was lower in the older women (60% vs 87%, P = .025). The false-positive rate was similar in women with normal and abnormal breast ultrasound. Positive thermographic result in women with Breast Imaging Reporting and Data System (BIRADS) 4A on ultrasound increased the probability of breast cancer by over 2-fold. Conversely, a negative thermographic result decreased the probability of cancer more than 3-fold. Breast size and structure did not affect the thermography performance. No adverse events were observed. Conclusions: Thermography performed well in women <50 years of age, while its specificity in women ≥50 years was inadequate. These promising findings suggest that the Braster device deserves further investigation as a supporting tool for the early detection of breast cancer in women younger than 50 years of age.
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Kruljc, Peter. "Thermographic Examination of the Horse." Acta Veterinaria 73, no. 3 (2023): 289–316. http://dx.doi.org/10.2478/acve-2023-0023.
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Abstract Thermography is a noninvasive diagnostic imaging technique that detects regions of the body surface with increased (or decreased) temperature by measuring infrared radiation. It reveals physiological and pathophysiological changes primarily related to blood flow and metabolic rate in the examined body regions, as well as altered heat production. These include physical stress, various physical injuries, medical conditions, and environmental factors. In equine medicine, thermography can be used for early detection of tissue temperature changes, allowing intervention at an early stage of a medical deterioration. Thermographic examination can be used to detect tissue abnormalities in all regions of the body. It is particularly useful for the detection of musculoskeletal disorders. Inflammatory processes are present in many diseases and injuries, which can be successfully detected with thermography. Thermography makes it possible to monitor the success of treatment. Often, thermographically visible disease changes are detected before clinical signs or other imaging techniques become visible in the animal. In physical therapy, it helps locate regions of the body in need of treatment and plays an important role in detecting illegal procedures (such as local analgesics) to improve competitive performance in horses. Thermography serves as a complementary diagnostic tool. However, in practice, it has some limitations. The method is not specific and cannot determine the etiology of pathological changes. Therefore, it is usually used together with other diagnostic methods (such as X-ray, ultrasound, computed tomography and magnetic resonance imaging) and can not replace them.
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Makashova, N. V., A. E. Vasilyeva, O. Yu Kolosova та N. E. Morozova. "Рossibilities of the Thermography in Early Diagnostics of Bleb Scarring (Prelimenary Report)". Ophthalmology in Russia 18, № 2 (2021): 290–95. http://dx.doi.org/10.18008/1816-5095-2021-2-290-295.
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Thermography is the method of noninvasive registration of visible image of the own infrared radiation of the human body surface by special devices. The physiological basis of its application in medical diagnostics is the amplification of infrared radiation intensity from pathologic spots that is connected with the enhancement of blood supply and metabolism.Purpose. To study the possibilities of thermography for functional bleb status assessment, for early diagnostics of bleb scarring processes and for definition of needling indications.Patients and methods. There were executed 32 thermography (32 patients and eyes) of blebs in 7 days after minimally invasive sinustrabeculectomy. Authors used thermal imaging Тesto 875-2i with SuperResolution technology and telephoto lens 9°×7°. The bleb area and temperature were studied With IRSoft and Universal Desktop Ruler programs. Intraocular pressure (corneal compensated) (IOPcc) was measured with Ocular Response Analyzer®, ORA.Conclusion. The study has shown the direct correlation dependence between bleb functional activity and its thermographic characteristics (area and temperature).
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Yousefi, Ibarra-Castanedo, and Maldague. "Infrared Non-Destructive Testing via Semi-Nonnegative Matrix Factorization." Proceedings 27, no. 1 (2019): 13. http://dx.doi.org/10.3390/proceedings2019027013.
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Detection of subsurface defects is undeniably a growing subfield of infrared non-destructive testing (IR-NDT). There are many algorithms used for this purpose, where non-negative matrix factorization (NMF) is considered to be an interesting alternative to principal component analysis (PCA) by having no negative basis in matrix decomposition. Here, an application of Semi non-negative matrix factorization (Semi-NMF) in IR-NDT is presented to determine the subsurface defects of an Aluminum plate specimen through active thermographic method. To benchmark, the defect detection accuracy and computational load of the Semi-NMF approach is compared to state-of-the-art thermography processing approaches such as: principal component thermography (PCT), Candid Covariance-Free Incremental Principal Component Thermography (CCIPCT), Sparse PCT, Sparse NMF and standard NMF with gradient descend (GD) and non-negative least square (NNLS). The results show 86% accuracy for 27.5s computational time for SemiNMF, which conclusively indicate the promising performance of the approach in the field of IR-NDT.
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Partida González, C., C. González Sánchez, N. L. Pérez Chuliá, and J. Otero Rebollo. "Medical termography. Diagnosis and clinical evolution in postraumatic cervical sprain." Cuadernos de Medicina Forense 26, no. 26(02) (2023): 121–31. http://dx.doi.org/10.59457/cmf.2023.26.02.org.06.
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The main objective of this study is to validate medical thermography as a useful complementary test to determine acute processes in grade I and II trauma of cervical sprain after a traffic accident. From May 2020 to August 2021, thermographic studies were carried out on people injured in traffic accidents with a main diagnosis of cervical sprain, treated in health centers in 20 Spanish provinces, carried out by accredited technical personnel and under pre-established conditions. The data were analyzed by a team of Pain Specialist Anesthesiologists using specific software for application in clinical medicine. The results of this study allow us to affirm that thermography provides reliable data on the clinical situation of the patient both at the beginning and in its evolution after treatment, being of great help for medical decision-making. Its simple application and innocuousness allow thermography to monitor evolutionary processes with unlimited repeatability, detecting temperature changes on the skin’s surface caused by physiological dysfunction.
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Mironov, S. P., A. I. Krupatkin, and G. M. Burmakova. "The use of computer thermography in the diagnosis of diseases of the lumbosacral spine in athletes and ballet dancers." N.N. Priorov Journal of Traumatology and Orthopedics 9, no. 3 (2022): 31–35. http://dx.doi.org/10.17816/vto99932.
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The experience in thermographic examination of 108 patients (athlets and ballet dancers) with lumbar-sacral spine diseases is presented. All patients have been treated at the CITO Department of Sports and Ballet Injury during the period from 1987 to 2002. Various thermograms typical of osteochondrosis, spondyloarthrosis, spondylolysis and ligamentous pathology of lumbar-sacral spine are given and described. Thermography is shown to be a nonspecific examination method which only defines more precisely the clinical and radiologic data. The main value of thermography is the possibility to detect the activity of the pathologic process and to retrace the dynamics of the disease development during follow up and treatment.
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Dragomir, Alin, Maricel Adam, Silviu-Marian Antohi, Adrian Vîlcu, and Alexandra Bodoga. "Considerations Regarding Electrical Equipment Monitoring Through Infrared Thermography." Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section 68, no. 4 (2022): 45–56. http://dx.doi.org/10.2478/bipie-2022-0021.
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Abstract In the paper are highlighted the main advantages of wireless monitoring methods present in the market for electrical equipment temperature surveillance. Also, are considerate the mandatory corrections applied to the thermographic image in order to adjust the electrical equipment temperature. In the final part, there are shown the resulted values of an infrared thermography inspection performed in industrial environment, which reveals the thermal stresses identification of the busbar’s connections from a medium voltage switch separator. In addition, the paper present why a highly reflexive surface is not suitable for infrared thermography, and in what manner affects the data obtained from the monitoring devices.
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Munguía-Siu, Andrés, Irene Vergara, and Juan Horacio Espinoza-Rodríguez. "The Use of Hybrid CNN-RNN Deep Learning Models to Discriminate Tumor Tissue in Dynamic Breast Thermography." Journal of Imaging 10, no. 12 (2024): 329. https://doi.org/10.3390/jimaging10120329.
Full textAbstract:
Breast cancer is one of the leading causes of death for women worldwide, and early detection can help reduce the death rate. Infrared thermography has gained popularity as a non-invasive and rapid method for detecting this pathology and can be further enhanced by applying neural networks to extract spatial and even temporal data derived from breast thermographic images if they are acquired sequentially. In this study, we evaluated hybrid convolutional-recurrent neural network (CNN-RNN) models based on five state-of-the-art pre-trained CNN architectures coupled with three RNNs to discern tumor abnormalities in dynamic breast thermographic images. The hybrid architecture that achieved the best performance for detecting breast cancer was VGG16-LSTM, which showed accuracy (ACC), sensitivity (SENS), and specificity (SPEC) of 95.72%, 92.76%, and 98.68%, respectively, with a CPU runtime of 3.9 s. However, the hybrid architecture that showed the fastest CPU runtime was AlexNet-RNN with 0.61 s, although with lower performance (ACC: 80.59%, SENS: 68.52%, SPEC: 92.76%), but still superior to AlexNet (ACC: 69.41%, SENS: 52.63%, SPEC: 86.18%) with 0.44 s. Our findings show that hybrid CNN-RNN models outperform stand-alone CNN models, indicating that temporal data recovery from dynamic breast thermographs is possible without significantly compromising classifier runtime.
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Liu, Xingliang, Guiyun Tian, Yu Chen, Haoze Luo, Jian Zhang, and Wuhua Li. "Non-Contact Degradation Evaluation for IGBT Modules Using Eddy Current Pulsed Thermography Approach." Energies 13, no. 10 (2020): 2613. http://dx.doi.org/10.3390/en13102613.
Full textAbstract:
In this paper, a non-contact degradation evaluation method for insulated gate bipolar transistor (IGBT) modules is proposed based on eddy current pulsed thermography approach. In non-contact heat excitation procedures, a high-power induction heater is introduced to generate heat excitation in IGBT modules. The thermographs of the whole temperature mapping are recorded non-invasively by an IR camera. As a result, the joint degradation of IGBT modules can be evaluated by the transient thermal response curves derived from the recorded thermographs. Firstly, the non-destructive evaluation principle of the eddy current pulsed thermography (ECPT) system for an IGBT module with a heat sink is introduced. A 3D simulation module is built with physical parameters in ANSYS simulations, and then thermal propagation behavior considering the degradation impact is investigated. An experimental ECPT system is set up to verify the effectiveness of the proposed method. The experimental results show that the delay time to peak temperature can be extracted and treated as an effective indicative feature of joint degradation.