Results 291 to 300 of about 15,851,959 (333)
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Ultrasound in Medicine & Biology, 1994
Myocardial contrast echocardiography (MCE) is an ultrasound imaging technique which promises to provide a safe, noninvasive means of assessing myocardial perfusion. A contrast agent, consisting of a suspension of air-filled microspheres, serves as an ultrasound tracer. When these microspheres are injected intravascularly, the acoustic interface created
J W, Winkelmann +4 more
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Myocardial contrast echocardiography (MCE) is an ultrasound imaging technique which promises to provide a safe, noninvasive means of assessing myocardial perfusion. A contrast agent, consisting of a suspension of air-filled microspheres, serves as an ultrasound tracer. When these microspheres are injected intravascularly, the acoustic interface created
J W, Winkelmann +4 more
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Contrast-Associated Acute Kidney Injury.
New England Journal of Medicine, 2019Contrast-Associated Acute Kidney Injury This review summarizes the pathophysiology and definition of contrast-associated acute kidney injury, as well as risk stratification.
R. Mehran, G. Dangas, S. Weisbord
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Journal of the Optical Society of America A, 1991
In foveal vision there is a tendency toward contrast constancy above threshold. Contrast sensitivity varies greatly across different spatial and temporal frequencies and at different luminances, but perception of contrast above threshold varies much less (in logarithmic terms).
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In foveal vision there is a tendency toward contrast constancy above threshold. Contrast sensitivity varies greatly across different spatial and temporal frequencies and at different luminances, but perception of contrast above threshold varies much less (in logarithmic terms).
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Royal Institute of Philosophy Supplement, 1990
According to a causal model of explanation, we explain phenomena by giving their causes or, where the phenomena are themselves causal regularities, we explain them by giving a mechanism linking cause and effect. If we explain why smoking causes cancer, we do not give the cause of this causal connection, but we do give the causal mechanism that makes it.
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According to a causal model of explanation, we explain phenomena by giving their causes or, where the phenomena are themselves causal regularities, we explain them by giving a mechanism linking cause and effect. If we explain why smoking causes cancer, we do not give the cause of this causal connection, but we do give the causal mechanism that makes it.
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Veterinary Clinics of North America: Small Animal Practice, 1993
Pharmacologic development and clinical use of nonionic low osmolality contrast agents have lowered incidences of contrast reactions. Exclusive use of these agents may be limited owing to their high costs. Ionic high osmolality agents still provide reliable means of positive contrast enhancement, and minimal problems with reactions have been experienced
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Pharmacologic development and clinical use of nonionic low osmolality contrast agents have lowered incidences of contrast reactions. Exclusive use of these agents may be limited owing to their high costs. Ionic high osmolality agents still provide reliable means of positive contrast enhancement, and minimal problems with reactions have been experienced
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American Journal of Nephrology, 1981
Contrast nephropathy is an adverse alteration in renal function induced by intravascular contrast media. Most cases involve transient asymptomatic episodes; yet a significant number involve oliguria and/or permanent renal damage. The incidence of contrast nephropathy in the general hospitalized population is about 5%, and is associated with preexisting
S, Harkonen, C, Kjellstrand
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Contrast nephropathy is an adverse alteration in renal function induced by intravascular contrast media. Most cases involve transient asymptomatic episodes; yet a significant number involve oliguria and/or permanent renal damage. The incidence of contrast nephropathy in the general hospitalized population is about 5%, and is associated with preexisting
S, Harkonen, C, Kjellstrand
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Ophthalmology Clinics of North America, 2003
Spatial contrast is a physical dimension referring to the light-dark transition of a border or an edge in an image that delineates the existence of a pattern or an object. Contrast sensitivity refers to a measure of how much contrast a person requires to see a target.
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Spatial contrast is a physical dimension referring to the light-dark transition of a border or an edge in an image that delineates the existence of a pattern or an object. Contrast sensitivity refers to a measure of how much contrast a person requires to see a target.
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Clinical Techniques in Small Animal Practice, 2005
Cystography is a radiographic study performed to aid in evaluation of the urinary bladder for extramural, mural, or intraluminal lesions. These lesions may primarily involve the urinary bladder or may be an extension of disease from adjacent organs. Cystography is easy to perform with relatively few complications.
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Cystography is a radiographic study performed to aid in evaluation of the urinary bladder for extramural, mural, or intraluminal lesions. These lesions may primarily involve the urinary bladder or may be an extension of disease from adjacent organs. Cystography is easy to perform with relatively few complications.
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The Controversy of Contrast-Induced Nephropathy With Intravenous Contrast: What Is the Risk?
American Journal of Kidney Diseases, 2019Contrast-induced nephropathy (CIN) has long been observed in both experimental and clinical studies. However, recent observational studies have questioned the prevalence and severity of CIN following intravenous contrast exposure.
M. Rudnick +5 more
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