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Journal articles on the topic 'Significant contrast'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Gayed, Isis W., Osama A. Raslan, Priya R. Bhosale, Nancy D. Perrier, Wei Wei, and Gregory Gladish. "Significant Coronary Calcification Detected Using Contrast-Enhanced Computed Tomography." Clinical Nuclear Medicine 35, no. 6 (2010): 404–8. http://dx.doi.org/10.1097/rlu.0b013e3181db4ad6.

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Russo, Neuza Gonçalves. "A contrastive analysis of some significant Portuguese and English phonemes." Estudos Germânicos 7, no. 1 (1986): 177. http://dx.doi.org/10.17851/0101-837x.7.1.177-215.

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This work deals with the description, distribution and classification of the English consonantal phonemes: /t/, /g/, /đ/, /l/, /č/ and the vowel phonemes: /u/ and /ə/ and their contrast to the corresponding Portuguese phonemes. Not only the contrast is shown but also the problems related to the learning of the above phonemes and their allophones by Portuguese speakers and some possible techniques and pieces of advice to minimize the problem. Este trabalho trata da descrição, distribuição e classificação dos fonemas /t/, /g/, /đ/, /l/, /č/ do inglês e dos fonemas vocálicos /u/ e /ə/ e o seu con

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Dr., Ch Veerendra Ravi Kiran, G. Muralidhar Dr., K. R. Ravikanth Dr., and T. Jaya Chandra Dr. "Incidence of contrast induced nephropathy among patients undergoing coronary interventions." Incidence of contrast induced nephropathy among patients undergoing coronary interventions 7, no. 6 (2019): 443–46. https://doi.org/10.17511/ijmrr.2019.i06.01.

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Background: Contrast media (CM) used during diagnostic and therapeutic percutaneous procedures is eliminated by the kidneys. A study has been planned to find the adverse effects of contrast agents on renal system. Methods: This was a hospital based cross sectional study, conducted in the department of general medicine, GSL Medical College. Individuals >25 age, both gender with heamoglobin concentration of > 10mg/dl were included. Exclusion criteria was also followed. Iodixanol or iohexol was used, administered at the rate of 80 – 100 ml per participants. Blood samples were collecte

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Gilchrist, Jim, Richard Pope, Usha Dhanesha, Sally Young, and Clare Horsley. "Prevalence of significant pre-clinical contrast sensitivity loss in diabetics." Ophthalmic and Physiological Optics 17, no. 2 (1997): 170. http://dx.doi.org/10.1046/j.1475-1313.1997.97807302.x.

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Mustafa, Wan Azani, Haniza Yazid, Hiam Alquran, Yazan Al-Issa, and Syahrul Junaini. "Significant effect of image contrast enhancement on weld defect detection." PLOS ONE 19, no. 6 (2024): e0306010. http://dx.doi.org/10.1371/journal.pone.0306010.

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Weld defect inspection is an essential aspect of testing in industries field. From a human viewpoint, a manual inspection can make appropriate justification more difficult and lead to incorrect identification during weld defect detection. Weld defect inspection uses X-radiography testing, which is now mostly outdated. Recently, numerous researchers have utilized X-radiography digital images to inspect the defect. As a result, for error-free inspection, an autonomous weld detection and classification system are required. One of the most difficult issues in the field of image processing, particu

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GILCHRIST, J. "Prevalence of significant pre-clinical contrast sensitivity loss in diabetics." Ophthalmic and Physiological Optics 17, no. 2 (1997): 170. http://dx.doi.org/10.1016/s0275-5408(97)80730-2.

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Lie, Ignatius Rivaldo, and Derry Alamsyah. "Pernerapan Algortima Diffie-Hellman pada Steganografi Least Significant Bit." MDP Student Conference 2, no. 1 (2023): 234–43. http://dx.doi.org/10.35957/mdp-sc.v2i1.4107.

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Perkembangan teknologi informasi berkembang begitu pesat seiring berjalannya waktu. Saat ini, informasi sering dipertukarkan melalui Internet dan karena itu rentan terhadap pencurian informasi. Banyak jenis informasi yang menggunakan pengamanan khusus seperti pin, kata sandi, dan data diri. Sehingga rentan terhadap penyadapan data melalui ruang bertukar informasi publik. Dalam penelitian ini dilakukan penerapan algoritma Diffie-hellman untuk steganografi least significant bits. Steganografi citra adalah proses penyembunyian pesan rahasia dalam citra digital dan Kriptografi adalah studi tentang

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Friedman, Mark A. "Contrast Echocardiography." Einstein Journal of Biology and Medicine 21, no. 1 (2016): 2. http://dx.doi.org/10.23861/ejbm200421443.

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Ultrasound contrast agents are widely used in clinical practice for left ventricle opacification in sub-optimal echocardiograms. Recently, significant research has focused on the use of contrast echocardiography as a non invasive means to evaluate myocardial perfusion. Advances in contrast agents as well as ultrasound technology have enabled investigations into myocardial contrast echocardiography as a possible alternative to nuclear imaging studies. This review will focus on the development and current uses of contrast echocardiography, as well as future indications, including myocardial perf

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Saba, L., M. Piga, E. Raz, D. Farina, and R. Montisci. "Carotid Artery Plaque Classification: Does Contrast Enhancement Play a Significant Role?" American Journal of Neuroradiology 33, no. 9 (2012): 1814–17. http://dx.doi.org/10.3174/ajnr.a3073.

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Matsushima, Kazuhide, Monica Peng, Eric W. Schaefer, Jeffrey H. Pruitt, Jeffry L. Kashuk, and Heidi L. Frankel. "Posttraumatic Contrast-Induced Acute Kidney Injury: Minimal Consequences or Significant Threat?" Journal of Trauma: Injury, Infection, and Critical Care 70, no. 2 (2011): 415–20. http://dx.doi.org/10.1097/ta.0b013e3182095fa6.

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11

Bucher, Andreas M., Carlo N. De Cecco, U. Joseph Schoepf, et al. "Is Contrast Medium Osmolality a Causal Factor for Contrast-Induced Nephropathy?" BioMed Research International 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/931413.

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The exact pathophysiology of contrast-induced nephropathy (CIN) is not fully clarified, yet the osmotic characteristics of contrast media (CM) have been a significant focus in many investigations of CIN. Osmotic effects of CM specific to the kidney include transient decreases in blood flow, filtration fraction, and glomerular filtration rate. Potentially significant secondary effects include an osmotically induced diuresis with a concomitant dehydrating effect. Clinical experiences that have compared the occurrence of CIN between the various classes of CM based on osmolality have suggested a m

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12

Barrett, B. J. "Contrast nephrotoxicity." Journal of the American Society of Nephrology 5, no. 2 (1994): 125–37. http://dx.doi.org/10.1681/asn.v52125.

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Iodinated contrast media have some nephrotoxic potential but rarely cause significant renal failure in patients with normally functioning kidneys. Patients with existing renal impairment, with or without diabetes, those with current congestive heart failure of Class III or IV, those with reduced effective arterial volume (e.g., nephrotic, cirrhotic), or those receiving drugs that may impair renal function or increase contrast nephrotoxicity are at higher risk. Contrast nephrotoxicity may be clinically important in patients with other factors simultaneously affecting the renal response to contr

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HATTORI, KOMEI. "Is the Pair-wise Contrast of Fatfolds Significant in Determining Body Composition?" Anthropological Science 102, no. 1 (1994): 75–84. http://dx.doi.org/10.1537/ase.102.75.

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Min, James K. "Assessing Hemodynamically Significant CAD by Difference in Contrast Opacification of CT Angiograms." JACC: Cardiovascular Imaging 9, no. 9 (2016): 1084–86. http://dx.doi.org/10.1016/j.jcmg.2016.01.029.

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15

Smith, Wayne S. "Contrast Constancy Revisited: The Perceived Contrast of Sinusoidal Gratings above Threshold." Quarterly Journal of Experimental Psychology 68, no. 2 (2015): 363–80. http://dx.doi.org/10.1080/17470218.2014.944919.

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The contrast sensitivity function of the human visual system, measured with sinusoidal luminance gratings, has an inverted U shape with a peak around 2–4 c/deg. Above threshold, it is thought that luminance gratings of equal physical contrasts but of distinguishably different spatial frequencies are all perceived as having similar contrasts, a phenomenon that has been termed contrast constancy. However, when suprathreshold contrast matches were measured for pairs of luminance gratings whose spatial frequencies were indistinguishable, the matching curves were not flat and followed a similar inv

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Chaichana, Kaisorn L., Thomas Kosztowski, Ashwini Niranjan, et al. "Prognostic significance of contrast-enhancing anaplastic astrocytomas in adults." Journal of Neurosurgery 113, no. 2 (2010): 286–92. http://dx.doi.org/10.3171/2010.2.jns091010.

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Object Patients harboring anaplastic astrocytomas (AAs) typically have a poor prognosis, with median survival times of approximately 3 years following resection. However, a significant variability in individual outcomes remains, with some patients surviving for a few months and others for several years. The ability to predict patient outcomes based on preoperative variables would help prognosticate survival and may also guide treatment strategies. The prognostic implications of a preoperative contrast-enhancing AA remain poorly understood. Methods The medical records of all patients who underw

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Black, Martha R., Anabela Rato, and Yasaman Rafat. "Effect of perceptual training without feedback on bilingual speech perception." Journal of Monolingual and Bilingual Speech 6, no. 2 (2024): 127–50. http://dx.doi.org/10.1558/jmbs.25370.

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This study examines the effect of perceptual training without feedback on the discrimination of the Spanish stop-approximant contrasts [b]–[B], [d]–[ð], and [g]–[y]. Of interest is if the aural repetition of target stimuli improves discrimination accuracy, how many repetitions are needed to observe a significant increase in perceptual discrimination accuracy, and if there is an effect of contrast type. Perception of the Spanish target phones was assessed in adult native (L1) Spanish speakers (n = 10) and L1 English bilingual learners of L2 Spanish (n = 23) via VCV nonwords over six blocks of 1

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18

Yang, Min-Jae, Hyeon-Seok Han, Seong-Ju Lee, Min-Soo Lee, and Myeong-Joo Cho. "A Study on Reduced Contrast Media Dose during Contrast Enhanced Abdominal CT: An AI-based Contrast Enhancement Boost Technique." Korean Society of Computed Tomographic Technology 26, no. 1 (2024): 65–73. http://dx.doi.org/10.31320/jksct.2024.26.1.65.

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In our hospital, we implement a reduction in contrast media dose (calculated as body weight × 1.2 mL) for clinical examinations conducted with dual-source dual-energy CT during contrast-enhanced abdominal CT examinations. Therefore, by applying the CE-Boost technique, the degree of contrast enhancement of blood vessels and tissues was compared with standard contrast media dose (body weight × 1.6 mL) in 120 kV single-source computed tomography images. In contrast-enhanced abdominal CT using the standard contrast media dose, the CE-Boost technique was applied to investigate the feasibility of re

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19

Ichhpujani, Parul, Uday Pratap Singh Parmar, Rohan Bir Singh, and Suresh Kumar. "Assessment of central and peripheral contrast sensitivity in myopes using Spaeth/Richman contrast sensitivity." Oman Journal of Ophthalmology 18, no. 1 (2025): 16–21. https://doi.org/10.4103/ojo.ojo_271_23.

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Abstract BACKGROUND: Assessing central and peripheral contrast sensitivity (CS) in myopic patients with varying degrees of refractive error using Spaeth/Richman contrast sensitivity test (SPARCS) and compared it with emmetropic individuals. MATERIALS AND METHODS: CS of 50 consecutive myopic individuals of varying severity was matched with emmetropes using an online CS test, SPARCS, and Pelli-Robson test. Group comparisons for continuously distributed data were made using analysis of variance (ANOVA) when comparing the groups. A post hoc analysis was also done to compare pairs of each group. SP

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Estabraq, Hussein Jasim Halboos, and M. Albakry Abbas. "Hiding text using the least significant bit technique to improve cover image in the steganography system." Bulletin of Electrical Engineering and Informatics 11, no. 6 (2022): 3258~3271. https://doi.org/10.11591/eei.v11i6.4337.

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One of the highest priorities in the era of information technology is to achieve an accurate and effective system for hiding security data. One of the goals of steganography is imperceptability to intruder. So this paper work to increase the imperceptibility on image, which has weaknesses in previous studies, as well as to avoid statistical attacks such as chi-square. A method has been proposed that includes calculating the color contrasts in the homogeneous areas of the image and dividing them according to the color contrast and exploiting the data of pixels that have a high impact to embed o

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Yao, Luyu, Honglin Dong, Cynthia Zhao, Shu Yang, and Wayne W. Zhang. "PS226. Significant Increase of Urine Fibrinogen in Mouse Model of Contrast-Induced Nephropathy." Journal of Vascular Surgery 59, no. 6 (2014): 87S. http://dx.doi.org/10.1016/j.jvs.2014.03.195.

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22

Zholudev, A. A., V. N. Trushin, Y. V. Chuprunov, and Al F. Khokhlov. "Significant improvement in contrast and information value of images of defects in crystals." Acta Crystallographica Section A Foundations of Crystallography 56, s1 (2000): s206. http://dx.doi.org/10.1107/s0108767300024545.

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23

Weisbord, Steven D., Kathryn C. Hartwig, Ali F. Sonel, Michael J. Fine, and Paul Palevsky. "The incidence of clinically significant contrast-induced nephropathy following non-emergent coronary angiography." Catheterization and Cardiovascular Interventions 71, no. 7 (2008): 879–85. http://dx.doi.org/10.1002/ccd.21565.

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24

Liu, Lu, Lingxian Xu, Junyue Wang, and Huang Wu. "Effect of Luminance and Contrast Variation on Stereoacuity Measurements Using Smartphone Technology." Journal of Ophthalmology 2021 (December 23, 2021): 1–8. http://dx.doi.org/10.1155/2021/5258782.

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Owing to the limitations of printed stereoacuity tests, the effects of luminance and contrast on stereopsis have not yet been sufficiently investigated, despite its important implications in designing stereoacuity measuring instruments, particularly for electronic devices. A stereopsis measurement system was established using two 4 K smartphones and a phoropter to evaluate the effects of luminance and contrast variations on the stereoacuity test. Seventeen young subjects with normal visual acuity and stereopsis were recruited. Two types of test symbols, contour-based and random-dot-based, were

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Okwori, Onoja Peter, Kato Chaha, Abdu Lawan, and Ugochukwu Anthony Eze. "Contrast sensitivity assessment using the Mars letter contrast sensitivity test." Medical hypothesis, discovery & innovation in optometry 5, no. 1 (2024): 10–17. http://dx.doi.org/10.51329/mehdioptometry192.

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Background: Contrast sensitivity (CS) represents an individual’s ability to detect differences in luminance between two areas and is an essential component of vision. Various studies have evaluated the relevance of different charts to assess CS in ophthalmology practice. We evaluated the CS of healthy individuals using the Mars letter CS chart. Methods: In this hospital-based cross-sectional study, we consecutively recruited healthy individuals older than 18 years with unremarkable ocular examinations who attended the general outpatient clinic at Benue State University Teaching Hospital, Makur

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Larsson, Helena, Anna-Karin Edberg, Ingrid Bolmsjö, and Margareta Rämgård. "Contrasts in older persons’ experiences and significant others’ perceptions of existential loneliness." Nursing Ethics 26, no. 6 (2018): 1623–37. http://dx.doi.org/10.1177/0969733018774828.

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Background: As frail older people might have difficulties in expressing themselves, their needs are often interpreted by others, for example, by significant others, whose information health care staff often have to rely on. This, in turn, can put health care staff in ethically difficult situations, where they have to choose between alternative courses of action. One aspect that might be especially difficult to express is that of existential loneliness. We have only sparse knowledge about whether, and in what way, the views of frail older persons and their significant others concerning existent

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Raptanova, Vladislava A., Alexandra A. Speranskaya, and Sergei N. Proshin. "Contrast-induced nephropathy (Pharmacology of X-ray contrast agents)." Pediatrician (St. Petersburg) 7, no. 1 (2016): 97–105. http://dx.doi.org/10.17816/ped7197-105.

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In the last 30 years the use of X-ray contrast media (RCM) has increased significantly during urography, angiography, computed tomography, and operating procedures. Every year the world uses about 60 million doses of PKM, but, despite the use of newer and less nephrotoxic drugs, the risk of contrast-induced nephropathy (CIN) is still significant, especially among patients with prior renal impairment. Contrast induced nephropathy is a major cause of acute renal injury and is a huge problema in clinical practice. So far, con-tradictions remain in the understanding of many aspects of CIN. Contras

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Neumann, Antonia, Alexander Leube, Najma Nabawi, et al. "Short-Term Peripheral Contrast Reduction Affects Central Chromatic and Achromatic Contrast Sensitivity." Photonics 9, no. 3 (2022): 123. http://dx.doi.org/10.3390/photonics9030123.

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Peripheral retinal contrast reduction is suggested as a potential myopia control strategy. However, the underlying mechanism is yet unknown. Therefore, this study investigated the influence of peripheral contrast reduction on central chromatic and achromatic contrast sensitivity (CS). A total of 19 participants were included. Peripheral contrast reduction was induced via Bangerter foils of 0.4 and 0.8 density, each with a clear central zone of 8.0 mm diameter. Central achromatic and chromatic (for S-, M-, and L-cone types) CS was measured at 3 and 12 cpd in a 2-IFC psychophysical procedure. CS

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Magister, Beatriz M. O’Donell, and Elisa M. Colombo. "Inner contrast and perceptual quality in tasks with video display units." Lighting Research & Technology 33, no. 3 (2001): 145–59. http://dx.doi.org/10.1177/136578280103300302.

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The purpose of this paper is to find the physical luminance contrast of an image that best relates to perceptual quality in VDU achromatic tasks. The studies were carried out by measurement of visual performance, comfort judgements and contrast adjustment, taking into account different resolutions, polarities, background luminances and illuminance values. The results add a new piece of evidence about inner contrast as an appropriate criterion to describe perceptual contrast. Inner contrast also provides a satisfactory criterion for the optimum relation of luminances in inner details of charact

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Shieh, Kong-King, and Yen-Kung Lai. "Effects of Ambient Illumination, Luminance Contrast, and Stimulus Type on Subjective Preference of VDT Target and Background Color Combinations." Perceptual and Motor Skills 107, no. 2 (2008): 336–52. http://dx.doi.org/10.2466/pms.107.2.336-352.

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This study investigated the effects of the target and background color combination on subjective preference, i.e., aesthetic appearance, legibility and visual comfort, of stimuli presented on a visual display terminal under various ambient illuminations, luminance contrasts, and stimulus types. Analysis showed the main effect of color combination was significant for the three dependent variables. Black-on-white and blue-on-white were the most preferred combinations, while turquoise-on-green and turquoise-on-red were the least preferred. A sign was rated better than text. The significant intera

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Goessmann, Holger, Stephan Schleder, Christian Stroszczynski, and Andreas G. Schreyer. "Significance of Postprocedural Contrast Medium Injection after CT-Guided Abscess Drainage." Tomography 9, no. 4 (2023): 1434–42. http://dx.doi.org/10.3390/tomography9040114.

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The aim was to evaluate the additive clinical value of an additional post-procedural control-scan after CT-guided percutaneous abscess drainage (PAD) placement with contrast medium (CM) via the newly placed drain. All CT-guided PADs during a 33-month period were retrospectively analyzed. We analyzed two subgroups, containing patients with and without surgery before intervention. Additionally, radiological records were reevaluated, concerning severe inflammatory response syndrome (SIRS) during the intervention. A total of 499 drainages were placed under CT-guidance in 352 patients. A total of 1

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Eves, Richard. "‘Black and white, a significant contrast’: Race, humanism and missionary photography in the Pacific." Ethnic and Racial Studies 29, no. 4 (2006): 725–48. http://dx.doi.org/10.1080/01419870600665490.

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Tirnaksiz, M. B., C. Deschamps, M. S. Allen, D. C. Johnson, and P. C. Pairolero. "Effectiveness of Screening Aqueous Contrast Swallow in Detecting Clinically Significant Anastomotic Leaks after Esophagectomy." European Surgical Research 37, no. 2 (2005): 123–28. http://dx.doi.org/10.1159/000084544.

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Alshalaggi, Salah, Hamid Osman, Mohammed Elsamani, et al. "Pre-contrast CT calcium score correlation with significant risk factors for coronary artery disease." Journal of Radiation Research and Applied Sciences 16, no. 1 (2023): 100516. http://dx.doi.org/10.1016/j.jrras.2022.100516.

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Umi, Salamah, Sarno Riyanarto, Zainal Arifin Agus, Satriyo Nugroho Anto, Ekoprayitno Rozi Ismail, and Budi Setia Asih Puji. "Incorporating Index of Fuzziness and Adaptive Thresholding for Image Segmentation." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 4 (2018): 2406–18. https://doi.org/10.11591/ijece.v8i4.pp2406-2418.

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Binary Segmentation of an image played an important role in many image processing application. An image that was having no bimodal (or nearly) histogram accompanied by low-contrast was still a challenging segmentation problem to address. In this paper, we proposed a new segmentation strategy to images with very irregular histogram and had not significant contrast using index of fuzziness and adaptive thresholding. Index of fuzziness was used to determine the initial threshold, while adaptive thresholding was used to refine the coarse segmentation results. The used data were grayscale images fr

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THORESON, WALLACE B., and DWIGHT A. BURKHARDT. "Contrast encoding in retinal bipolar cells: Current vs. voltage." Visual Neuroscience 20, no. 1 (2003): 19–28. http://dx.doi.org/10.1017/s0952523803201036.

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To investigate the influence of voltage-sensitive conductances in shaping light-evoked responses of retinal bipolar cells, whole-cell recordings were made in the slice preparation of the tiger salamander, Ambystoma tigrinum. To study contrast encoding, the retina was stimulated with 0.5-s steps of negative and positive contrasts of variable magnitude. In the main, responses recorded under voltage- and current-clamp modes were remarkably similar. In general agreement with past results in the intact retina, the contrast/response curves were relatively steep for small contrasts, thus showing high

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Huo, X., and G. Yossifon. "Significant enhancement of the electrorheological effect by non-straight electrode geometry." Soft Matter 15, no. 32 (2019): 6455–60. http://dx.doi.org/10.1039/c9sm00819e.

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In contrast to the commonly used straight electrodes with electrorheological (ER) fluid, here we studied the effect of non-straight electrodes where more than one order of magnitude enhancement of the apparent viscosity was observed.

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McCourt, Mark E. "Comparing the Spatial-Frequency Response of First-Order and Second-Order Lateral Visual Interactions: Grating Induction and Contrast – Contrast." Perception 34, no. 4 (2005): 501–10. http://dx.doi.org/10.1068/p5348.

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The magnitudes of two suprathreshold lateral spatial-interaction effects—grating induction and contrast–contrast—were compared with regard to their dependence upon inducing-grating spatial frequency. Both effects cause the contrast of target stimuli embedded in surrounding patterns to be matched nonveridically. The magnitudes of each effect were measured in a common unit that indexed the degree of nonveridical contrast matching across a large range of target-grating contrasts (±0.80). Grating induction was a low-pass effect with respect to spatial frequency, whereas contrast–contrast was bandp

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Kovalevskaya, M. A., O. A. Evdokimova, V. V. Sorokin, E. G. Kartamyshev, and A. V. Podoprigora. "Contrast sensitivity and contrast as criteria for loss of vision quality in retinal diseases." Modern technologies in ophtalmology, no. 1 (March 21, 2024): 208–14. http://dx.doi.org/10.25276/2312-4911-2024-1-208-214.

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Contrast sensitivity (CS) better correlates with subjective visual impairment and visionrelated quality of life compared with visual acuity (VA). Scleral lenses (SL) are a promising approach in the rehabilitation of patients with AMD, as they have a number of functional and cosmetic advantages. Despite the available types of SL, the search for possible modifications to improve the quality of life of patients with AMD continues. Purpose. To evaluate the effectiveness of contact correction using color filters to improve contrast sensitivity in patients with AMD. Material and methods. In the firs

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Koretsky, S. N., O. V. Mirgorodskaya, Yu A. Vasyuk, and O. M. Drapkina. "Diagnostic significance of myocardial and multimodal contrast exercise stress echocardiography in the detection of hemodynamically significant coronary artery stenosis in stable angina pectoris." Cardiovascular Therapy and Prevention 22, no. 4 (2023): 3540. http://dx.doi.org/10.15829/1728-8800-2023-3540.

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Aim. To evaluate the diagnostic significance of myocardial contrast stress echocardiography (MCSE) and multimodal contrast stress echocardiography (MMSE) with dosed exercise in detecting hemodynamically significant coronary artery stenosis in patients with stable coronary heart disease (CAD) without impaired regional left ventricular contractility at rest.Material and methods. MCSE and MMSE were performed in 61 patients with suspected or stable CAD (mean age, 62,9±8,9 years). All patients underwent coronary angiography. During MCSE, perfusion and regional contractility were assessed. With M

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Pelewicz, Katarzyna, and Piotr Miśkiewicz. "Iodinated contrast media-induced hyperthyroidism." Journal of Medical Science 89, no. 2 (2020): e439. http://dx.doi.org/10.20883/medical.e439.

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Currently, iodinated contrast media (ICM) is widely used in radiology, therefore numerous patients are exposed to contrast administration during diagnostic and interventional procedures. ICM contains an amount of iodine well above the recommended dietary allowance, which can lead to thyroid dysfunction. Indeed, individuals that are highly susceptible to increased iodine intake are often patients with pre-existing thyroid disease. ICM-induced hyperthyroidism (IIH) is usually transient, however, it may present as clinically significant thyrotoxicosis. Although IIH has been investigated in multip

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Navin, Kumar, Kumar Keshaw, Kashif Rizwi Md, Kumar Ranjan, and Meena Anamika. "Comparative Analysis of Multiphasic Contrast-Enhanced CT and Contrast-Enhanced MRI in Evaluating Hepatic Mass Lesions." International Journal of Pharmaceutical and Clinical Research 16, no. 5 (2024): 2093–97. https://doi.org/10.5281/zenodo.12803720.

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<strong>Background:</strong> There are several different benign and malignant disorders that can cause hepatic mass lesions. Precise imaging is essential to diagnosis and treatment. Due to its higher soft tissue contrast and non-ionizing radiation nature, contrast-enhanced magnetic resonance imaging, or CEMRI, is becoming more and more popular over multiphasic contrast-enhanced computed tomography (CECT), which has been the standard method. The purpose of this study is to evaluate hepatic mass lesions and compare the diagnostic accuracy of multiphasic CECT and CEMRI. <strong>Methods:

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Tipper, John C. "Do seismic reflections necessarily have chronostratigraphic significance?" Geological Magazine 130, no. 1 (1993): 47–55. http://dx.doi.org/10.1017/s0016756800023712.

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AbstractMany seismic reflections from within sedimentary successions are thought to be generated along stratal surfaces because those surfaces are laterally continuous and have marked acoustic impedance contrasts. As stratal surfaces are isochronous, those reflections are then also taken as being chronostratigraphically significant. In contrast, seismic reflections are thought not to be generated along the boundaries of lithostratigraphic units because those boundaries are discontinuous and gradational. Nevertheless, synthetic seismic analysis shows that seismic reflections should in many circ

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Rydland, J., A. Bjørnerud, O. Haugen, et al. "New intravascular contrast agent applied to dynamic contrast enhanced MR imaging of human breast cancer." Acta Radiologica 44, no. 3 (2003): 275–83. http://dx.doi.org/10.1080/j.1600-0455.2003.00068.x.

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Purpose: To evaluate the feasibility of using dynamic contrast-enhanced MR imaging with a new intravascular contrast agent in grading human breast cancer. Material and Methods: 23 patients with 27 breast tumors (21 carcinomas and 6 fibroadenomas) were examined with dynamic MR imaging after administration of Clariscan, an iron oxide nanoparticle with large T1 relaxivity and a long plasma half life. A 3D T1-weighted gradient echo sequence with an acquisition time of 60 s was repeated at regular intervals of 3–5 min before and up to 1 h after injection of 2 mg/kg b.w. of Clariscan. The endothelia

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Zhou, J. W., and Sami Dib. "An examination of large-scale galactic effects on molecular cloud properties in NGC 628: the significant impact of tidal effects from neighbouring material on the evolution of molecular clouds." Monthly Notices of the Royal Astronomical Society 537, no. 2 (2025): 2232–42. https://doi.org/10.1093/mnras/staf201.

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ABSTRACT The physical factors that influence the development of molecular cloud’s density contrast are connected to those that affect star formation in the galaxy. For NGC 628 (M74), the proportion of high- and low-density contrast clouds initially increases with the distance to the galactic centre ($R_{G}$) and then keeps relatively stable. Spiral arms, bubbles, and magnetic fields are not responsible for the variations in density contrast observed among molecular clouds. The effects of shear and tides calculated from the galactic rotation curve consistently decrease as $R_{G}$ increases, and

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Kulkarni, Chaitanya S., Jatin P. Kothari, Rashika A. Sirsat, and Alan F. Almeida. "A Simplified Risk Score to Estimate the Risk of Contrast-Induced Nephropathy after Contrast Exposure." Indian Journal of Nephrology 33, no. 5 (2023): 333–39. http://dx.doi.org/10.4103/ijn.ijn_65_21.

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Introduction: Scores are available to predict the probability of contrast-induced nephropathy (CIN) after cardiac interventions, but not many scores are available for non-cardiac interventions and there are none for intravenous exposure to contrast. We designed this study to develop a simplified score to determine the probability of developing CIN in patients exposed to the parenteral contrast medium. Methods: This was a prospective study of patients who received parenteral contrast. Of 1300 patients, the first 1000 comprised the derivation cohort and the next 300 comprised the validation coho

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Sharfaa, Peeroo Azraa Beebee, and Fakhruddin Shamsheer Barodawala. "Effect of Yellow Filter On Contrast Sensitivity Function In High Myopes." Journal of Multidisciplinary Research in Healthcare 9, no. 2 (2023): 75–79. http://dx.doi.org/10.15415/jmrh.2023.92008.

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Background: This study examines the influence of yellow filter on the contrast sensitivity function in individuals with high myopia. Through a comprehensive analysis, we explore the potential enhancement of visual perception and contrast sensitivity in this population. The findings con-tribute to our understanding of effective interventions to optimize visual outcomes for high myopes. Purpose: A cross-sectional study was conducted where thirty-four (n=34) healthy young subjects (age range 17-25 years old) having high myopia (SER ≥ 6.00D) without any ocular pathology. Contrast sensitivity func-

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Raastad, Morten, and Ole Kiehn. "Spike Coding During Locomotor Network Activity in Ventrally Located Neurons in the Isolated Spinal Cord From Neonatal Rat." Journal of Neurophysiology 83, no. 5 (2000): 2825–34. http://dx.doi.org/10.1152/jn.2000.83.5.2825.

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To characterize spike coding in spinal neurons during rhythmic locomotor activity, we recorded from individual cells in the lumbar spinal cord of neonatal rats by using the on-cell patch-clamp technique. Locomotor activity was induced by N-methyl-d aspartate (NMDA) and 5-hydroxytryptamine (5-HT) and monitored by ventral root recording. We made an estimator based on the assumption that the number of spikes arriving during two halves of the locomotor cycle could be a code used by the neuronal network to distinguish between the halves. This estimator, termed the spike contrast, was calculated as

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Celebi, Filiz, Emetullah Cindil, Dauren Sarsenov, Bulent Unalan, and Cem Balcı. "Added Value of Contrast Medium in Whole-Body Hybrid Positron Emission Tomography/Magnetic Resonance Imaging: Comparison between Contrast-Enhanced and Non-Contrast-Enhanced Protocols." Medical Principles and Practice 29, no. 1 (2019): 54–60. http://dx.doi.org/10.1159/000501497.

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Objective: To compare the diagnostic ability and time efficiency of contrast-enhanced (CE) whole body fluorodeoxyglucose (FDG) positron emission tomography/magnetic resonance imaging (PET/MRI) protocol and non-CE (NCE) protocol. Subjects and Methods: Ninety-three patients with known primary tumors underwent whole-body hybrid FDG PET/MRI during the follow-up of their malignancies with the use of NCE and CE protocols. The NCE PET/MRI protocol consisted of diffusion-weighted (b = 0 and 800 s/mm2) and T1-weighted Turbo Flash in the axial plane and T2-weighted HASTE sequence in the coronal planes (

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Perazella, Mark A. "Is Intravenous Contrast-Associated Acute Kidney Injury a Significant Problem and Are Risk Scores Useful?" Kidney360 6, no. 1 (2025): 9–11. https://doi.org/10.34067/kid.0000000636.

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