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Добірка наукової літератури з теми "DXA imaging"

Автор: Grafiati

Опубліковано: 23 травня 2025

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Статті в журналах з теми "DXA imaging"

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Hussain, Dildar, and Seung-Moo Han. "Computer-aided osteoporosis detection from DXA imaging." Computer Methods and Programs in Biomedicine 173 (May 2019): 87–107. http://dx.doi.org/10.1016/j.cmpb.2019.03.011.

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Sorci, Olivia R., Rashad Madi, Sun Min Kim, Alexandra S. Batzdorf, Austin Alecxih, Julia N. Hornyak, Sheenali Patel, and Chamith S. Rajapakse. "Normative vertebral deformity measurements in a clinically relevant population using magnetic resonance imaging." World Journal of Radiology 16, no. 12 (December 28, 2024): 749–59. https://doi.org/10.4329/wjr.v16.i12.749.

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BACKGROUND Osteoporosis is the leading cause of vertebral fractures. Dual-energy X-ray absorptiometry (DXA) and radiographs are traditionally used to detect osteoporosis and vertebral fractures/deformities. Magnetic resonance imaging (MRI) can be utilized to detect the relative severity of vertebral deformities using three-dimensional information not available in traditional DXA and lateral two-dimensional radiography imaging techniques. AIM To generate normative vertebral parameters in women using MRI and DXA scans, determine the correlations between MRI-calculated vertebral deformities and age, DXA T-scores, and DXA Z-scores, and compare MRI vertebral deformity values with radiography values previously published in the literature. METHODS This study is a retrospective vertebral morphometric analysis conducted at our institution. The patient sample included MR images from 1638 female patients who underwent both MR and DXA imaging between 2005 and 2014. Biconcavity, wedge, crush, anterior height (Ha)/posterior height (Hp), and middle height (Hm)/posterior height values were calculated from the MR images of the patient’s vertebrae. Associations between vertebral deformity values, patient age, and DXA T-scores were analyzed using Spearman correlation. The MRI-derived measurements were compared with radiograph-based calculations from population-based data compiled from multiple studies. RESULTS Age was positively correlated with lumbar Hm/Hp (P = 0.04) and thoracic wedge (P = 0.03) and biconcavity (P = 0.001) and negatively correlated with thoracic Ha/Hp (P = 0.002) and Hm/Hp (P = 0.001) values. DXA T-scores correlated positively with lumbar Hm/Hp (P < 0.0001) and negatively with lumbar wedge (P = 0.046), biconcavity (P < 0.0001), and Ha/Hp (P = 0.046) values. Qualitative analysis revealed that Ha/Hp differed between MRI and radiography population-based data by no more than 0.3 and Hm/Hp by a maximum of 1.2. CONCLUSION Compared with traditional imaging techniques, MRI detects vertebral deformities with high accuracy and reliability. It may be a sensitive, ionizing, radiation-free tool for use in clinical settings.

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Frøssing, Signe, Malin Chatarina Nylander, Elizaveta Chabanova, Caroline Kistorp, Sven O. Skouby, and Jens Faber. "Quantification of visceral adipose tissue in polycystic ovary syndrome: dual-energy X-ray absorptiometry versus magnetic resonance imaging." Acta Radiologica 59, no. 1 (May 23, 2017): 13–17. http://dx.doi.org/10.1177/0284185117711475.

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Background Polycystic ovary syndrome (PCOS) is associated with frequent overweight and abdominal obesity. Quantifying visceral adipose tissue (VAT) in PCOS patients can be a tool to assess metabolic risk and monitor effects of treatment. The latest dual-energy X-ray absorptiometry (DXA) technology can measure VAT and subcutaneous adipose tissue (SAT) in a clinical setting. Purpose To compare DXA-measurements of VAT and SAT with the gold standard MRI in women with PCOS. Material and Methods A cross-sectional study of 67 overweight women with PCOS was performed. Measurements of VAT and SAT were performed by DXA in a 5-cm thick transverse slice at the L4/L5 level and by MRI in a 1-cm thick transverse slice at the L3 level. Results Mean (SD) DXA-VAT was 81 (34) cm3, DXA-SAT was 498 (118) cm3, MRI-VAT was 117 (48) cm3, and MRI-SAT was 408 (122) cm3. MRI and DXA measures of VAT (r = 0.82, P < 0.001) and SAT (r = 0.92, P < 0.001) correlated closely, and DXA-VAT was stronger correlated with MRI-VAT than BMI (r = 0.62, P < 0.001) and waist circumference (r = 0.60, P < 0.001). DXA-VAT coefficient of variance was 6.7% and inter correlation coefficient was 0.98. Bland–Altman analyses showed DXA to slightly underestimate VAT and SAT measurements compared with MRI. Conclusion DXA and MRI measurements of VAT and SAT correlated closely despite different size of region of interest, and DXA-VAT was superior to waist circumference and BMI in estimating MRI-VAT. DXA showed high reproducibility making it is suitable for repeated measurements in the same individual over time.

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Freda, Pamela U., Wei Shen, Carlos M. Reyes-Vidal, Eliza B. Geer, Fernando Arias-Mendoza, Dympna Gallagher, and Steven B. Heymsfield. "Skeletal Muscle Mass in Acromegaly Assessed by Magnetic Resonance Imaging and Dual-Photon X-Ray Absorptiometry." Journal of Clinical Endocrinology & Metabolism 94, no. 8 (August 1, 2009): 2880–86. http://dx.doi.org/10.1210/jc.2009-0026.

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Context: GH and IGF-I are nitrogen retaining and anabolic, but the impact of long-term exposure to supraphysiological GH and IGF-I, either from endogenous overproduction in acromegaly or exogenous sources, on skeletal muscle (SM) mass is not clear. Objectives: The objectives of the study were to assess SM mass by whole-body magnetic resonance imaging (MRI) in acromegaly and test the hypothesis that dual-energy x-ray absorptiometry (DXA) lean tissue mass-derived estimates of SM accurately estimate true SM mass. Design, Setting, and Patients: The design was a cross-sectional study in 27 acromegaly patients compared with predicted models developed in 315 nonacromegaly subjects and to matched controls. Outcome Measures: Mass of SM from whole-body MRI and lean tissue from DXA were measured. Results: SM mass did not differ from predicted or control values in active acromegaly: 31.75 ± 8.6 kg (acromegaly) vs. 33.06 ± 8.9 kg (predicted); SM was 95.6 ± 12.8% of predicted (range 66.7–122%) (P = 0.088). Lean tissue mass (DXA) was higher in acromegaly than controls: 65.91 ± 15.2 vs. 58.73 ± 13.5 kg (P < 0.0001). The difference between lean tissue mass (DXA) and SM in acromegaly patients was higher than that in controls (P < 0.0001) consistent with an enlarged non-SM lean compartment in acromegaly. SM mass predicted by DXA correlated highly with SM mass by MRI (r = 0.97, P < 0.0001). SM (MRI) to SM (DXA predicted) ratio was 1.018 (range 0.896–1.159), indicating high agreement of these measures of SM. Conclusions: SM mass in active acromegaly patients did not differ from predicted values. SM mass estimated from DXA agreed highly with SM by MRI, supporting the validity of the DXA model in assessing SM in acromegaly and other disorders of GH/IGF-I secretion.

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Yue, Dong, Sun Li Fei, Chen Jing, Wang Ru Xin, Dong Rui Tong, Liu Ai Lian, and Ya Hong Luo. "The relationship between calcium (water) density and age distribution in adult women with spectral CT: initial result compared to bone mineral density by dual-energy X-ray absorptiometry." Acta Radiologica 60, no. 6 (September 24, 2018): 762–68. http://dx.doi.org/10.1177/0284185118801139.

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Background Calcium (water) density (DCa(Wa)) of gemstone spectral imaging by spectral computed tomography (CT) is a new method of evaluating bone structures. Purpose To investigate age-related change of DCa(Wa) of a chosen lumbar vertebra in adult women with spectral CT and the correlation between the DCa(Wa) and bone mineral density (BMD) of dual-energy X-ray absorptiometry (DXA). Material and Methods A total of 305 adult women underwent spectral CT, 127 of whom simultaneously underwent DXA. All the patients were divided into 11 subgroups based on age. DCa(Wa) and BMD were measured at the second lumbar vertebra on the calcium (water)-based material decomposition images of spectral CT and DXA, respectively. A one-way analysis of variance (ANOVA) was performed for the difference of the measurements among adjacent age subgroups. Pearson correlation was used to assess the association between age and DCa(Wa), age and BMD, as well as DCa(Wa) and BMD. Results There was a significant negative correlation between DCa(Wa) and age (r = −0.719) as well as BMD and age(r = −0.851). The mean DCa(Wa) of L2 vertebral body was significantly different between the 40–44- and 45–49-, 45–49- and 50–54-, 55–59- and 60–64-, 65–69- and 70–74-year-old age subgroups. BMD was significantly different between the 35–39- and 40–44-, 45–49- and 50–54-, and 65–69- and 70–74-year-old age subgroups. There was a significant positive correlation between DCa(Wa) and BMD. Conclusions The DCa(Wa) of lumbar vertebra by spectral CT demonstrated similar age distribution as BMD of DXA and could be used as a method of measuring the vertebral bone mineral density in adult women.

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Mu, Shengkai, Jingxu Wang, and Shuyi Gong. "Application of Medical Imaging Based on Deep Learning in the Treatment of Lumbar Degenerative Diseases and Osteoporosis with Bone Cement Screws." Computational and Mathematical Methods in Medicine 2021 (October 11, 2021): 1–10. http://dx.doi.org/10.1155/2021/2638495.

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Objective. To explore the application value of magnetic resonance spectroscopy (MRS) and GSI-energy spectrum electronic computed tomography (CT) medical imaging based on the deep convolutional neural network (CNN) in the treatment of lumbar degenerative disease and osteoporosis. Methods. There were 56 cases of suspected lumbar degenerative disease and osteoporosis. A group of 56 subjects were examined using 1.5 TMR spectrum (MRS) and dual-energy X-ray absorptiometry (DXA) to collect the lumbar L3 vertebral body fat ratio (FF) and L1~4 vertebral bone mineral density (BMD) value. We divided the subjects into 2 groups with T value -2.5 as the critical point. Set T value > -2.5 as the negative group and T value ≤ -2.5 as the positive group. Pearson’s method is used for FF-MRS and BMD correlation analyses. A group of all patients underwent GSI-energy spectrum CT scan, and X-ray bone mineral density (DXA) test results (bone density per unit area) were used as the gold standard to analyze the diagnosis of osteoporosis by the GSI-energy spectrum CT scan method value. Results. The differences in FF and BMD between the negative group and the positive group were statistically significant ( P < 0.01 ), and there was a highly negative correlation between the average value of FF and BMD. 30 cases were diagnosed as osteoporosis by DXA. The accuracy of GSI-energy spectrum CT medical imaging in diagnosing osteoporosis is 89.30%. The GSI-energy spectrum CT diagnosis of osteoporosis and DXA examination results have good consistency. Conclusion. Based on the deep convolutional neural network (CNN) MRS technology, GSI-energy spectrum CT medical imaging is used in the clinical diagnosis and treatment of lumbar degenerative lesions and osteoporosis. It has a good advantage in assessing bone quality and has good consistency with DXA examination and has better application value high.

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Wilson, Kevin E., Chris R. Ruth, and Thomas L. Kelly. "DXA precision." Journal of Clinical Densitometry 10, no. 2 (April 2007): S205. http://dx.doi.org/10.1016/j.jocd.2007.03.026.

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C. Weigand, Anna, Helen Schweizer, Deise Aline Knob, and Armin M. Scholz. "Phenotyping of the Visceral Adipose Tissue Using Dual Energy X-ray Absorptiometry (DXA) and Magnetic Resonance Imaging (MRI) in Pigs." Animals 10, no. 7 (July 9, 2020): 1165. http://dx.doi.org/10.3390/ani10071165.

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The objective of this study was to phenotype visceral adipose tissue (VAT) in pigs. In this context, the ability to detect VAT by using the DXA CoreScan mode within the enCORE software, version 17 (GE Healthcare) was evaluated in comparison with MRI measurements (Siemens Magnetom C!) of the same body region. A number of 120 crossbred pigs of the F1 and F2 generation, with the parental breeds Large White, Landrace, Piétrain, and Duroc, were examined at an age of 150 days. A whole-body scan in two different modes (“thick”, “standard”) was carried out by a GE Lunar iDXA scanner. Very strong relationships (R2 = 0.95, RMSE = 175 cm3) were found for VAT between the two DXA modes. The comparison of VAT measured by MRI and DXA shows high linear relationships (“thick”: R2 = 0.76, RMSE = 399.25 cm3/“standard”: R2 = 0.71, RMSE = 443.42 cm3), but is biased, according to the Bland–Altman analysis. A variance analysis of VAT shows significant differences for both DXA modes and for MRI between male and female pigs, as well as between F1 and F2. In conclusion, DXA “CoreScan” has the ability to estimate VAT in pigs with a close relationship to MRI but needs bias correction.

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Yoon, Hong, Jung-Ho Kim, Dal-Sung Ryu, and Seung-Hwan Yoon. "What Causes the Discrepancy between Quantitative Computed Tomography and Dual Energy X-Ray Absorptiometry?" Nerve 7, no. 2 (October 31, 2021): 64–70. http://dx.doi.org/10.21129/nerve.2021.7.2.64.

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Objective: Dual energy X-ray absorptiometry (DXA) is a standard tool for measuring the bone mineral density (BMD), but it sometimes provides inaccurate results. In contrast, quantitative computed tomography (QCT) measures the BMD more accurately by directly measuring the trabecular bone. This study examined the factors that cause the discrepancy between DXA and QCT with advanced spinal imaging.Methods: The medical records of 59 patients who underwent DXA, QCT, and a lumbar spine magnetic resonance imaging (MRI) were reviewed retrospectively. The following values were measured on plain radiographs, computed tomography, and MRI: lumbar lordosis, segmental scoliosis, compression fracture, spondylosis, abdominal aortic calcification, facet joint degeneration, and Modic change. The significant parameters contributing to the discordance results between DXA and QCT were evaluated by logistic regression analysis.Results: QCT identified osteoporosis in 43 patients (72.88%). DXA identified 15 osteoporotic patients (25.42%). Of the 44 patients not diagnosed with osteoporosis by DXA, 30 patients (68.18%) were diagnosed with osteoporosis by QCT. Multivariate logistic regression analysis showed that the result of DXA might be overestimated by a degenerated facet joint (odds ratio [OR] 4.58; 95% confidence interval [CI], 1.1-19.07) and measurements at a fracture site (OR, 1.63; 95% CI, 1.23-2.15).Conclusion: DXA might miss a diagnosis of osteoporosis. Facet joint hypertrophy due to degeneration revealed a stronger association with the overestimation of the BMD by DXA than the formation of osteophytes at the vertebral body. Therefore, the results of DXA should be interpreted carefully, considering the possibility of interruption.

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Bazzocchi, Alberto, Amanda Isaac, Danoob Dalili, Anastasia Fotiadou, Eleni P. Kariki, Jan S. Kirschke, Christian R. Krestan, et al. "Imaging of Metabolic Bone Diseases: The Spine View, Part I." Seminars in Musculoskeletal Radiology 26, no. 04 (August 2022): 478–90. http://dx.doi.org/10.1055/s-0042-1754340.

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AbstractMetabolic bone diseases comprise a wide spectrum. Of them, osteoporosis is the most frequent and the most commonly found in the spine, with a high impact on health care systems and on morbidity due to vertebral fractures (VFs).This article discusses state-of-the-art techniques on the imaging of metabolic bone diseases in the spine, from the well-established methods to the latest improvements, recent developments, and future perspectives.We review the classical features of involvement of metabolic conditions involving the spine. Then we analyze the different imaging techniques for the diagnosis, characterization, and monitoring of metabolic bone disease: dual-energy X-ray absorptiometry (DXA) and DXA-based fracture risk assessment applications or indexes, such as the geometric parameters, Bone Strain Index, and Trabecular Bone Score; quantitative computed tomography; and magnetic resonance and ultrasonography-based techniques, such as radiofrequency echographic multi spectrometry. We also describe the current possibilities of imaging to guide the treatment of VFs secondary to metabolic bone disease.

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Дисертації з теми "DXA imaging"

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Farzi, Mohsen. "Bone ageing and osteoporosis : automated DXA image analysis for population imaging." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/22477/.

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Groll, Emily D. "Comparison of anthropometric and DXA measurements of regional body fat." Virtual Press, 2008. http://liblink.bsu.edu/uhtbin/catkey/1398712.

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Purpose: The primary purpose of this research study was to assess the degree of agreement between simple anthropometric measurements (i.e. body mass index, waist circumference, hip circumference, and waist-to-hip ratio) and the measures of regional adiposity, with a primary focus on the androidlgynoid ratio, assessed using dual energy x-ray absorptiometry (DXA). This secondary purpose of the study was to identify any significant correlations between the measures of regional adiposity, physical activity, and cardiovascular risk factors. Methods: Forty-eight subjects, 19 males (48.7 ± 16.9 years) and 29 females (43.6 ± 16.2 years), volunteered to participate in this study. Subjects underwent laboratory testing compromised of resting blood pressure, blood lipid analysis, waist & hip circumference, total body DXA scan, and a one week physical activity assessment. Results: Significant correlations were observed between body mass index and region body fat % (r = 0.84, 0.79), waist circumference and android fat % (r = 0.79, 0.75), and waist-to-hip ratio and androidlgynoid ratio (r = 0.72, 0.61) for men and women, respectively. Fasting insulin was correlated with region body fat %, android body fat %, trunk body fat %, and the android/gynoid ratio. The android/gynoid ratio was correlated with high density lipoproteins, very low density lipoproteins, triglycerides, and fasting glucose. There was a statistically significant negative relationship observed between average steps per day and body mass index, waist circumference, hip circumference, region body fat %, android body fat %, and trunk body fat %. Conclusions: This study found that there are strong relationships between simple anthropometric measures and regional body fat measures from the DXA. According to the data in the present study, body mass index, waist circumference, and waist-to-hip ratio provide simple yet sensitive methods for the estimation of regional body fat in Caucasian males and females. In addition, this study found significant correlations between measures of the blood lipid profile, physical activity, and both simple anthropometric and DXA measures of regional body fat. Key words: android fat, body mass index, dual-energy x-ray absorptiometry, gynoid fat, obesity, waist circumference.
School of Physical Education, Sport, and Exercise Science

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Jennings, Dalton James. "USE OF BODY COMPOSITION IMAGING TO CALCULATE 3-D INERTIAL PARAMETERS FOR INVERSE DYNAMIC ANALYSIS OF YOUTH PITCHING ARM KINETICS." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2122.

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The objectives of this study were to 1) calculate participant-specific segment inertial parameters using dual energy X-ray absorptiometry (DXA) data (referred to as full DXA-driven parameters) and compare the pitching arm kinetic predictions using full DXA-driven inverse dynamics vs scaled, DXA mass-driven (using DXA masses but scaled centers of mass and radii of gyration), and DXA scaled inverse dynamics(ID) (using the full DXA-driven inertial parameters averaged across all participants), 2) examine associations between full DXA-driven kinetics and body mass index (BMI) and 3) examine associations between full DXA-driven kinetics and segment mass index (SMI). Eighteen 10- to 11- year-olds pitched 10 fastballs. DXA scans were conducted and examined to obtain 3D inertial parameters of the upper arm, forearm, and hand. Full DXA-driven and scaled inertial parameters were compared using paired t-tests. Pitching arm kinetic predictions calculated with the four methods (i.e. scaled ID, DXA mass-driven ID, full DXA-driven ID, and DXA scaled ID) were compared using a repeated measures ANOVA with Tukey post-hoc tests. The major results were that 1) full DXA-driven participant specific inertial parameters differed from scaled inertial parameters 2) kinetic predictions significantly varied by method and 3) full DXA-driven ID predictions for shoulder compression force and shoulder internal rotation torque were significantly associated with BMI and/or SMI.

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Weigand, Anna Christine [Verfasser], and Armin [Akademischer Betreuer] Scholz. "Phenotyping of the visceral adipose tissue using Dual Energy X-ray Absorptiometry (DXA) and Magnetic Resonance Imaging (MRI) in pigs / Anna Christine Weigand ; Betreuer: Armin Scholz." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2021. http://d-nb.info/1230754849/34.

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Nelson, McKenzie Louise. "Predictions of Radius Bending Strength by Radius Stiffness, Mineral, and Ulna Mechanical Properties." Ohio University Art and Sciences Honors Theses / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ouashonors1492615282195033.

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6

Saleem, Afsah. "Machine learning for computer-aided diagnostics from complex medical images." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2025. https://ro.ecu.edu.au/theses/2927.

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Machine learning has significantly transformed medical image analysis in the current age of artificial intelligence offering vast potential in improving disease diagnosis and management. Cardiovascular diseases (CVDs) are among the leading cause of global mortality, emphasizing the need for early detection for effective intervention and prevention. Abdominal Aortic Calcification (AAC) is an early indicator and contributor to Atherosclerotic Cardiovascular Diseases (ASCVDs) and is commonly assessed through imaging modalities such as computed tomography (CT), X-rays, and Dual-energy X-ray Absorptiometry (DXA). Among these, lateral spine DXA scans, commonly used for osteoporosis screening, offer a cost-effective and low-radiation opportunity for opportunistic CVD risk assessment. Despite advancements in medical imaging technologies, AAC evaluation still relies on manual interpretation by trained clinicians, a process that is labor-intensive, subjective, and prone to variability. Automating the process of AAC quantification can address these challenges and enable consistent, early screening for CVD risk. This research presents robust machine-learning frameworks for the automated and accurate prediction of the AAC-24 score and its classification into relevant risk classes (low, moderate, and high). First, we explore deep feature ensembling methods to develop a deep feature fusion network for AAC-4 scoring using regression loss. However, its performance was limited by class ambiguities from inter-class similarities, intra-class variations, and low resolution VFA DXA artifacts. To mitigate this problem, we formulate AAC-24 scoring as an ordinal regression problem and propose a novel supervised contrastive ordinal learning (SCOL) framework. SCOL leverages a label-dependent distance metric to capture the ordinal nature of AAC labels. Using SCOL, we develop a Dual-encoder Contrastive Ordinal Learning (DCOL) framework to learn contrastive ordinal representation at global and local levels, improving feature separability and class diversity in the latent space among the AAC-24 categories. Clinical validation demonstrated a strong association between ML-AAC-24 scores and ASCVD risk, with substantial agreement between ML predictions and expert assessments. To enhance generalizability across different imaging modalities, SCOL framework is further explored for lateral spine X-rays via cross-domain fine-tuning, enhancing its utility in diverse clinical settings. To strengthen this work on highly imbalanced disease grading medical datasets, a prototype-based learning approach is incorporated within the SCOL framework to develop a generic disease grading system. The framework is evaluated on public datasets for diabetic retinopathy grading and breast cancer staging, demonstrating its ability to learn robust, ordinal-aware prototypes that generalize across diverse medical imaging tasks. Additionally, to enhance the interpretability and reliability of automated systems in clinical diagnosis, we develop a context-aware ordinal learning framework for granular-level AAC-24 scoring. We address the challenges of SCOl in handling class imbalance for ordinal regression tasks and introduce SCOL+. We explore SCOL+ in a multi-label setting to determine the extent of calcification in each section of the aorta to aid clinicians in making detailed and interpretable diagnoses. In this thesis, the AAC algorithms are developed using five large clinical datasets obtained from machines with different manufactures, including patients from Australia, Canada, and the United States, spanning both male and female patients. In conclusion, as DXA scans are commonly captured in various clinical scenarios, this research offers a novel and opportunistic approach to cardiovascular disease detection and monitoring in clinical practice, potentially revolutionizing the way we approach CVD risk screening.

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Gill, Martin. "DNA-binding ruthenium complexes : cellular imaging and cytotoxicity." Thesis, University of Sheffield, 2010. http://etheses.whiterose.ac.uk/1161/.

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Müller, Thomas. "Imaging of DNA and DNA-RAP1 assembly by STM, TEM and SFM /." [S.l.] : [s.n.], 1994. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10958.

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Domingues, Juan de Moraes. "Che Guevara : a m?dia como potencializadora do mito." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2008. http://tede2.pucrs.br/tede2/handle/tede/4357.

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Made available in DSpace on 2015-04-14T14:40:50Z (GMT). No. of bitstreams: 1 407971.pdf: 2301241 bytes, checksum: 2c2a812141f3b25e08595dee907fd565 (MD5) Previous issue date: 2008-12-10
Este trabalho analisa a for?a de perman?ncia do mito de Che Guevara 40 anos depois de sua morte. Desde que foi morto na Bol?via, em outubro de 1967, Che se transformou em mito, a despeito de suas distintas vers?es e releituras ao longo do tempo. A famosa foto de Alberto Korda, reproduzida aos milhares nessas quatro d?cadas, se tornou uma esp?cie de totem ideol?gico, mas tamb?m uma imagem consumida por milhares de pessoas das mais diferentes maneiras. Esta disserta??o, portanto, se ocupa em verificar a trajet?ria deste mito e a for?a que o mant?m. Para isso, o estudo identifica ao menos quatro vari?veis que atuam no fortalecimento do mito de Che: a midi?tica, a ideol?gica, a imag?tica e a de consumo. Embora n?o ajam necessariamente de forma simult?nea e nem na ordem acima citada, ? este ciclo que retroalimenta o universo guevarista. ? importante notar que dentre as quatro vari?veis, ? a m?dia que, em seus diferentes suportes, potencializa as outras tr?s, impulsionando a imagem, o consumo e a ideologia de Che e seu mito.

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Wei, Diming. "The beauty of DNA architecture : the design and applications in DNA nanotechnology /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CBME%202009%20WEI.

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Книги з теми "DXA imaging"

1

Licata, Angelo A. A DXA primer for the practicing clinician: A case-based manual for understanding and interpreting bone densitometry. New York: Springer, 2014.

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2

Thomson, Sarah L. Imagina un día. Barcelona: Editorial Juventud, 2006.

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3

Irek, Waldemar. Ad imaginem Tuam: Księga jubileuszowa dla uczczenia Arcybiskupa Mariana Gołębiowskiego. Wrocław: Papieski Wydział Teologiczny, 2012.

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4

Workshop on Document Image Analysis (1997 San Juan, P.R.). Proceedings, Workshop on Document Image Analysis (DIA '97): June 20, 1997, San Juan, Puerto Rico : in cooperation with CVPR '97. Los Alamitos, CA: IEEE Computer Society Press, 1997.

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5

Marinho, Caio. Sertão, sertões: Repensando contradições, reconstruindo veredas : um percurso em muitos tempos pelas imagens do conflito. São Paulo: Elefante, 2019.

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6

Zidong, Wang, and Liu Xiaohui, eds. Microarray image analysis: An algorithmic approach. Boca Raton, FL: Chapman & Hall/CRC, 2010.

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7

Marques, Susana Lourenço. Pó, cinza e nevoeiro: Ensaio sobre a ausência a partir de imagens da colecção de fotografia da Muralha. Guimarães]: A Oficina, CIPRL, 2018.

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8

Mouriquand, Jacqueline. Diagnosis of non-palpable breast lesions: Ultrasonographically controlled fine-needle aspiration : diagnostic and prognostic implications of cytologic grading, morphometry, DNA cytometry, immunocytochemistry, and color doppler. Basel: Karger, 1993.

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9

Mouriquand, Jacqueline. Diagnosis of non-palpable breast lesions: Ultrasonographically controlled fine-needle aspirations : diagnostic and prognostic implications of cytologic grading, morphometry, DNA cytometry, immunocytochemistry, and color doppler. Basel: Karger, 1993.

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10

1941-, Natterer F., and Wübbeling Frank, eds. Mathematical methods in image reconstruction. Philadelphia: Society for Industrial and Applied Mathematics, 2001.

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Більше джерел

Частини книг з теми "DXA imaging"

1

Albanese, Carlina V. "Periprosthetic DXA." In Imaging of Prosthetic Joints, 81–92. Milano: Springer Milan, 2014. http://dx.doi.org/10.1007/978-88-470-5483-7_8.

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2

Whitehouse, Richard. "Dual Energy X-Ray Absorptiometry (DXA)." In Imaging and Technology in Urology, 19–22. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-2422-1_5.

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3

Walker, Nicholas Faure, and Richard Whitehouse. "Dual Energy X-Ray Absorptiometry (DXA)." In Imaging and Technology in Urology, 19–23. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-26058-2_4.

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4

Lin, Yu-Ching, and Wing P. Chan. "Extraskeletal Causes of Imaging Pitfalls on DXA." In Dual Energy X-ray Absorptiometry, 157–80. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-9542-4_6.

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Rothman, Micol S. "Applying DXA and Other Imaging to Clinical Conundrums." In 2016 Meet-The-Professor: Endocrine Case Management, 48–50. 2055 L Street, NW, Suite 600, Washington, DC 20036: The Endocrine Society, 2016. http://dx.doi.org/10.1210/mtp5.9781943550043.ch9.

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Bromiley, P. A., J. E. Adams, and T. F. Cootes. "Localisation of Vertebrae on DXA Images Using Constrained Local Models with Random Forest Regression Voting." In Recent Advances in Computational Methods and Clinical Applications for Spine Imaging, 159–71. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14148-0_14.

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Qin, Yi-Xian, Yi Xia, Wei Lin, Erik Mittra, Clint Rubin, and Barry Gruber. "Noninvasive Ultrasound Imaging for Bone Quality Assessment Using Scanning Confocal Acoustic Diagnosis, μCT, DXA Measurements, and Mechanical Testing." In Lecture Notes in Computer Science, 216–23. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-77413-6_28.

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8

Raz, Eytan. "DSA Imaging Protocol and Technique." In Neurovascular Imaging, 67–84. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4614-9029-6_50.

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9

Raz, Eytan. "DSA Imaging Protocol and Technique." In Neurovascular Imaging, 1–17. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-9212-2_50-1.

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Weis, Serge, Michael Sonnberger, Andreas Dunzinger, Eva Voglmayr, Martin Aichholzer, Raimund Kleiser, and Peter Strasser. "Desmoplastic (Infantile) Astrocytoma/Ganglioglioma (DIA/DIG)." In Imaging Brain Diseases, 1545–52. Vienna: Springer Vienna, 2019. http://dx.doi.org/10.1007/978-3-7091-1544-2_63.

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Тези доповідей конференцій з теми "DXA imaging"

1

Lee, S., J. Jung, Y. Choi, J. H. Jung, S. Lee, and S. Jang. "Development of Multi-Channel DXA Detector for Cone Beam Data Acquisition." In 2024 IEEE Nuclear Science Symposium (NSS), Medical Imaging Conference (MIC) and Room Temperature Semiconductor Detector Conference (RTSD), 1. IEEE, 2024. http://dx.doi.org/10.1109/nss/mic/rtsd57108.2024.10657318.

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2

Pearce, Emma, Nathan R. Gemmell, Jefferson Flórez, Jiaye Ding, Rupert F. Oulton, Alex S. Clark, and Chris C. Phillips. "Cancer Detection using Quantum Imaging with Undetected Photons." In Quantum Sensing and Metrology, QTh1G.3. Washington, D.C.: Optica Publishing Group, 2024. https://doi.org/10.1364/qsm.2024.qth1g.3.

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QUIP shifts image wavelengths using quantum entanglement, allowing for imagers that work beyond the cutoff of our Si camera. We plan to use them to image the elevated DNA concentrations characteristic of Cancer.

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3

Dunn, Bryce, Remi Veneziano, Madinah Azizi, John R. Cressman, and Parag V. Chitnis. "DNA-based nanoprobes for fluorescence K+ sensing in neural systems." In Neural Imaging and Sensing 2025, edited by Qingming Luo, Jun Ding, and Ling Fu, 14. SPIE, 2025. https://doi.org/10.1117/12.3043800.

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4

Gong, Ruyi, Geng Wang, Nicolas Acosta, Yuanzhe Su, Wing Shun Li, Luay Almassalha, and Vadim Backman. "DNA spectroscopic intrinsic-contrast photon-localization optical nanoscopy." In Single Molecule Spectroscopy and Superresolution Imaging XVIII, edited by Rainer Erdmann, Felix Koberling, and Mike Heilemann, 18. SPIE, 2025. https://doi.org/10.1117/12.3042527.

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Taguchi, Katsuyuki, Shalini Subramanian, Andreia V. Faria, and William P. Segars. "Can we assess brain perfusion even when DSA images are contaminated by motion artifacts?" In Physics of Medical Imaging, edited by John M. Sabol, Shiva Abbaszadeh, and Ke Li, 28. SPIE, 2025. https://doi.org/10.1117/12.3044775.

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6

Tian, Leilei. "Conjugated-DNA hybrid materials for biosensing imaging and therapy applications." In Organic and Hybrid Sensors and Bioelectronics XVII, edited by Ioannis Kymissis, Emil J. List-Kratochvil, and Sahika Inal, 29. SPIE, 2024. http://dx.doi.org/10.1117/12.3036949.

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7

Dunn, Bryce, Ritesh Isuri, Marzieh Hanafi, Wendy Chung, David Rioux, Sébastien Blais-Ouellette, Edward J. Delikatny, John R. Cressman, Remi Veneziano, and Parag V. Chitnis. "NIR-II fluorescent DNA nanoparticles for contrast-enhanced tumor imaging." In Reporters, Contrast Agents, and Molecular Probes for Biomedical Applications XVI, edited by Ramesh Raghavachari and Mikhail Y. Berezin, 14. SPIE, 2025. https://doi.org/10.1117/12.3044021.

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8

Dimopoulos, George, Sabrina Reverol, Parmita Mondal, Michael Udin, Kyle A. Williams, Parisa Naghdi, Ahmad Rahmatpour, et al. "Automated registration of 3D neurovascular territory atlas to 2D DSA for targeted quantitative angiography analysis in subarachnoid hemorrhage." In Clinical and Biomedical Imaging, edited by Barjor S. Gimi and Andrzej Krol, 41. SPIE, 2025. https://doi.org/10.1117/12.3045442.

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9

Spisz, Thomas S., Thomas J. Beck, Howard S. Feldmesser, Michelle H. Chen, Thomas C. Magee, Paul R. Bade, and Harry K. Charles, Jr. "Determination of bone structural parameters from multiple projection DXA images." In Medical Imaging 2004, edited by Amir A. Amini and Armando Manduca. SPIE, 2004. http://dx.doi.org/10.1117/12.535361.

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10

Ahmad, Omar M., Krishna Ramamurthi, Kevin E. Wilson, Klaus Engelke, Mary Bouxsein, and Russell H. Taylor. "3D structural measurements of the proximal femur from 2D DXA images using a statistical atlas." In SPIE Medical Imaging, edited by Nico Karssemeijer and Maryellen L. Giger. SPIE, 2009. http://dx.doi.org/10.1117/12.811176.

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Звіти організацій з теми "DXA imaging"

1

Phoebe L. Stewart. Cryo-EM Imaging of DNA-PK DNA Damage Repair Complexes. Office of Scientific and Technical Information (OSTI), June 2005. http://dx.doi.org/10.2172/841088.

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Rosato-Scott, Claire, Dani J. Barrington, Amita Bhakta, Sarah J. House, Islay Mactaggart, and Jane Wilbur. Precisamos de Falar Sobre Incontinência. The Sanitation Learning Hub, Institute of Development Studies, October 2020. http://dx.doi.org/10.19088/slh.2020.007.

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Qualquer pessoa, de qualquer género, em qualquer idade, pode não conseguir conter a urina ou as fezes. O que faria se lhe acontecesse isso a si? Imagine que tinha acordado esta manhã e tinha feito chichi na cama. O que fazia? Lavava-se, vestia roupa lavada, mudava a roupa da cama e punha-a a lavar na máquina? Podia ir à loja e comprar pensos para incontinência. E, se soubesse que havia ajuda disponível para a incontinência urinária, talvez marcasse uma consulta médica na próxima semana e depois continuasse o seu dia, sem que a sua dignidade fosse afectada. Agora imagine que tinha acordado esta manhã e tinha feito chichi na cama. Mas, para se lavar ou para lavar a roupa e a roupa de cama, tinha de caminhar durante uma hora para ir buscar água. Imagine que tem medo de ir sozinho buscar água, o caminho é íngreme e custa-lhe a servir-se da bomba manual. Mesmo que arranjasse água, não tinha sabão suficiente e o cheiro continuava a fazer-se sentir qualquer forma. E que, depois de todo esse esforço, não tinha nada que pudesse usar para absorver a urina, se isto se repetisse. E se não soubesse que a incontinência urinária é comum, e passasse o resto do dia preocupado com a sua saúde e tivesse vergonha de ir para o trabalho, porque as pessoas podiam saber? E se estivesse preocupada que o seu companheiro lhe voltasse a bater por «estar a fazer porcarias», e, por isso, bebesse muito pouco durante todo o dia, com medo de que voltasse a acontecer o mesmo? O que se pode fazer para apoiar as pessoas que vivem com incontinência? Para começar, precisamos de falar de incontinência.

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Jittapiromsak, Nutchawan. Value of Dynamic Contrast-Enhanced Magnetic Resonance Imaging for Determining the Plasma Epstein-Barr Virus Status and Staging of Nasopharyngeal Carcinoma. Faculty of Medicine, Chulalongkorn University, 2019. https://doi.org/10.58837/chula.res.2019.9.

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Objective: To determine the associations between dynamic-contrast enhanced (DCE) magnetic resonance imaging (MRI) parameters and plasma Epstein-Barr virus (EBV) DNA status and nasopharyngeal carcinoma (NPC) stages. Methods: We prospectively studied the DCE MRI results of 47 patients with newly diagnosed NPC and a known pre-treatment plasma EBV DNA level. Regions of interest (ROIs) were drawn at primary tumors, and DCE MRI parameters, including mean and max values of Ktrans, Kep Ve, and Vp, were recorded. Spearman’s rank correlation was used to identify significant associations between DCE MRI parameters and plasma EBV DNA level and NPC stages. Mann-Whitney U tests and unpaired t-test were performed to compare DCE MRI parameters among groups and to find optimal cut-off values using receiver operating characteristic curves. Results: DCE MRI parameters were correlated with plasma EBV DNA levels and NPC stages. Positive plasma EBV DNA was correlated with lower Kepmean (optimal cut-off value, 2.1 min⁻¹ ; area under the curve [AUC], 0.714) and higher Vemax (optimal cut-off value, 0.675; AUC, 0.706). Vemax higher than 0.765 (AUC, 0.678) was correlated with plasma EBV DNA (≥2,300 copies mlll⁻¹). Higher Ktransmax (cut-off value, 1.495 min⁻¹; AUC, 0.767) was correlated with high T stage, and higher Vpmean(cut-off value, 0.125; AUC, 0739) was correlated with positive lymph nodes. Ktransmax higher than 1.495 min⁻¹ (AUC, 0.711) was correlated with the high stage group. Conclusions: DCE MRI is correlated with the plasma EBV DNA status and NPC stages. Therefore, DCE MRI findings may be used as imaging biomarkers for NPC patients.

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4

Kopelman, R. (Nanometer scale exciton spectroscopy and photochemistry: Dynamic imaging of DNA structure-activity relations and radiation signatures). Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/6060311.

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5

Opala-Berdzik, Agnieszka, Magdalena Rudek-Zeprzałka, Justyna Niesporek, Maciej Cebula, Jan Baron, Katarzyna Gruszczyńska, Augusto Gil Pascoal, Patrícia Mota, and Daria Chmielewska. Technical aspects of the inter-recti distance measurement with ultrasonographic imaging for physiotherapy purposes: A protocol for a scoping review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, September 2022. http://dx.doi.org/10.37766/inplasy2022.9.0116.

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Review question / Objective: The scoping review aims to identify publications describing the measurement of inter-recti distance (IRD)/diastasis recti abdominis (DRA) using ultrasonographic imaging (USI). The identification is based on the population/concept/context (PCC) framework that concerns human adults that underwent IRD/linea alba width/DRA measurement with USI for physiotherapy/physical exercise purposes. Based on systematically mapped peer-reviewed studies it is aimed to perform data extraction and synthesis of specific aspects of the IRD measurement procedure and discuss their similarities and differences. Related to that the attempt will be made to formulate recommendations on the IRD measurement procedure, which might be considered in future physiotherapy studies and practice. The recommendations will be made based on the synthesis of the results in light of existing literature and as the result of discussions and consensus between the authors (coming from three research centers).

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6

Kopelman, R. [Nanometer scale exciton spectroscopy and photochemistry: Dynamic imaging of DNA structure-activity relations and radiation signatures]. Progress report, September 24, 1990--July 24, 1991. Office of Scientific and Technical Information (OSTI), December 1991. http://dx.doi.org/10.2172/10107053.

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7

Kopelman, R. Nanometer scale exciton/photon dynamic spectrochemical imaging for DNA structure-activity relations and radiation signatures. Final progress report, December 24, 1993--December 23, 1996. Office of Scientific and Technical Information (OSTI), June 1997. http://dx.doi.org/10.2172/486116.

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8

Mesa Rosero, Edwin Hernán, Gloria Elsa Rodríguez Jiménez, María Victoria Díaz Franco, Claudia Meza Narváez, and María Inés Carmona López. Reconocimiento social de las profesiones de fonoaudiología y fisioterapia en Chile y Colombia. Corporación Universitaria Iberoamericana, January 2018. http://dx.doi.org/10.32457/12728/999820184.

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Según Fernández Pérez (2001) "El concepto profesión ha evolucionado a través del tiempo y ha sido producto de un desarrollo histórico, que ha creado y renovado mecanismos de diversa índole, hasta llegar a los procesos modernos que se conocen hoy en día", en ese sentido profesiones como la enfermería se han interesado por conocer y hasta transformar su imagen social en los diferentes ámbitos de desempeño, los cuales han llegado a ser tergiversado por los medios de comunicación, específicamente espacios televisivos como las novelas (Gómez-Bustamante, 2012; Encinas Prieto, 2016) 2. Por lo anterior se propuso un proceso de investigación que indagará la imagen social de la fisioterapia y la fonoaudiología utilizando una metodología mixta con un muestreo en bola de nieve, de esta manera se caracterizó percepción de la labor de los profesionales en fonoaudiología y fisioterapia en Chile y Colombia en tres grupos poblaciones, el social que contempló la comunidad en general, docentes y estudiantes de otras profesiones, el educativo en dónde se tuvo en cuenta a los profesionales y los estudiantes y el grupo ocupacional que considero a los empleadores. Para Colombia se obtuvieron 353 registros válidos, correspondiendo, como lo indica la tabla 13, docentes con el 18,1%, empleadores 4,2 %, estudiantes 36,3% y 41,4% comunidad en general

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Vargas, Sonia, Gelver Pérez, Milton Jara, Doris Chaparro, and Fredy Fernández. Proyecto Educativo del Programa de Licenciatura en Educación Infantil. Sonia Lucia Vargas, February 2019. http://dx.doi.org/10.35997/peplei2020.

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El proyecto educativo del programa (PEP), es un documento que contiene los lineamientos, políticas y principios que orientan y dirigen el desarrollo del programa. Este guarda coherencia con el Proyecto Educativo Institucional (PEI), y muestra la relación entre los objetivos del programa y las asignaturas de su plan de estudio. La Corporación Universitaria Adventista se define como una institución educativa cuyo origen, estructura y desarrollo responden a la concepción filosófica y misional de la iglesia Adventista del Séptimo Día. Esta filosofía se expresa de manera sintética en la siguiente declaración: Existe un Dios Creador, Redentor y Sustentador del universo, fuente de todo conocimiento y sabiduría. A su semejanza, Dios creó al ser humano perfecto; debido al pecado, aquel perdió su condición original. La educación adventista tiene como propósito coadyuvar a la restauración del ser humano a la imagen de su Hacedor, al generar ambientes de aprendizaje que estimulen la formación integral del estudiante en armonía con principios y valores cristianos que le permitan una preparación práctica para el servicio a Dios y a sus semejantes.

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Muñoz Valbuena, Diana Marcela, and Liliana Fonseca Cipagauta. Murciélagos de los Cerros Orientales. Universidad Militar Nueva Granada, November 2023. http://dx.doi.org/10.18359/litgris.7035.

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En un extenso proceso de selección natural, aparecen los únicos mamíferos voladores llamados murciélagos. Sus extremidades tomaron apariencia de alas y las membranas entre dedos se desarrollaron formando lo que hoy conocemos como patagio, es decir, la membrana de piel delgada que da el soporte para poder volar. A partir de ahí nació el término científico del orden Quiróptera el cual proviene del griego Kheriós que es mano y Ptéron que significa ala. Además, la palabra murciélago es originaria del latín mus o muris que refiere a ratón; caeculus a ciego y finalmente alatus a alado. Otra de las características por la que conocemos estas especies es la ecolocalización, la cual se refiere a la construcción de la imagen del entorno a través del sonido que es emitido por los objetos. Los quirópteros evolucionaron en dos clados Megachiroptera y microchiroptera. El primer clado está distribuido en Australia, Asia y África. Por su gran tamaño, son conocidos como los zorros voladores. Pueden alcanzar hasta 1.50 metros de envergadura, y sus ojos son desarrollados en respuesta a sus hábitos diurnos. Por ende, la ecolocalización es nula y no dependen de esta. Por otra parte, los microchiroptera se distribuyen por todo el mundo siendo mucho más pequeños y diversos, tienen hábitos fundamentalmente nocturnos por lo que sus ojos son menos desarrollados. Sin embargo, su ecolocalización es muy especializada. Los murciélagos han inspirado muchas historias fantásticas, fomentándose una imagen errónea y poco informativa de estas especies. Han sido asociados a enfermedades y males, y se cree que todas las especies son hematófagas, es decir, que se alimentan de sangre. Sin embargo, su morfología y hábitos de comportamiento son tan distintos que podemos encontrar a especies que se alimentan de polen (polinívoros), frutas (frugívoros), insectos (insectívoros), carne (carnívoros), y sangre (hematófagos), entre otros. Esto hace que desempeñen papeles protagónicos en los ecosistemas, como controladores de insectos, ayudan a que tengamos que comer sobre la mesa, dado que son claves en los procesos de polinización, y dispersión de semillas. En La Sabana de Bogotá hay una alta intervención del hombre, dada por las construcciones, las carreteras y las industrias. Sin embargo, aún se encuentran áreas protegidas, humedales y pequeños parches de bosque que son el pulmón de esta región, pero que cada vez estas zonas están más incomunicadas. Los murciélagos han mantenido la comunicación y el flujo de energía e interacciones al desplazarse entre ellas, conservando y restaurando estos ecosistemas frágiles. Por esta razón, es de vital importancia comprender y conocer mejor a nuestros buenos e importantes vecinos. Esta cartilla busca familiarizar al lector con algunos de los murciélagos que habitan La Sabana de Bogotá, y lograr que conociendo lo que tenemos lo preservemos.

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