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Contrast contrast determines perceived contrast
Optical Society of America Annual Meeting, 1991A testpatch of visual texture has greater apparent contrast when it is surrounded by a uniform mean gray field than by a background of similar, high contrast texture. Temporally modulating the contrast of surrounding texture induces a substantial antiphase modulation of testpatch apparent contrast.
Charles Chubb +2 more
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Current Problems in Cardiology, 2007
Myocardial contrast echocardiography (MCE) is a noninvasive imaging technique that relies on the ultrasound detection of microbubble contrast agents. These agents are confined to the intravascular space thereby producing signal enhancement from the blood pool.
Beat A, Kaufmann +2 more
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Myocardial contrast echocardiography (MCE) is a noninvasive imaging technique that relies on the ultrasound detection of microbubble contrast agents. These agents are confined to the intravascular space thereby producing signal enhancement from the blood pool.
Beat A, Kaufmann +2 more
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Clinical Radiology, 1977
Contrast nasopharyngography was performed in 25 cases of nasopharyngeal lesions, 15 of which were carcinoma, six malignant lymphoma, and four benign lesions including neurofibroma, haemangioma, angiofibroma and tuberculosis. Nasopharyngography was also performed in 22 cases with extranasopharyngeal lesions, including nine of head and neck malignant ...
Shimpei Tada +5 more
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Contrast nasopharyngography was performed in 25 cases of nasopharyngeal lesions, 15 of which were carcinoma, six malignant lymphoma, and four benign lesions including neurofibroma, haemangioma, angiofibroma and tuberculosis. Nasopharyngography was also performed in 22 cases with extranasopharyngeal lesions, including nine of head and neck malignant ...
Shimpei Tada +5 more
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The Contrast Contrast Illusion
2017Abstract To most observers, a patch of medium-contrast texture viewed against a background of high-contrast texture appears lower in contrast than an identical patch viewed against a homogeneous, mean gray background. This is the contrast contrast illusion.
Charles Chubb +2 more
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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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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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