Results 301 to 310 of about 6,621,534 (346)
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Strategies for increasing the sensitivity of gadolinium based MRI contrast agents.
Chemical Society Reviews, 2006Gadolinium(III) complexes are often used in clinical MRI to increase contrast by selectively relaxing the water molecules near the complex. There is a desire to improve the sensitivity (relaxivity) of these contrast agents in order to detect molecular ...
P. Caravan
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Photoacoustic Imaging: Contrast Agents and Their Biomedical Applications
Advances in Materials, 2018Photoacoustic (PA) imaging as a fast‐developing imaging technique has great potential in biomedical and clinical applications. It is a noninvasive imaging modality that depends on the light‐absorption coefficient of the imaged tissue and the injected PA ...
Qinrui Fu +4 more
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Optica Acta: International Journal of Optics, 1977
Like the modulation transfer function of man-made imaging devices, the contrast sensitivity of the human eye can be measured with sinusoidal grating targets of various spatial frequencies. Criterion-free psychophysical methods permit us to regard the contrast sensitivity as a direct measure of the subject's visual performance, independent of subjective
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Like the modulation transfer function of man-made imaging devices, the contrast sensitivity of the human eye can be measured with sinusoidal grating targets of various spatial frequencies. Criterion-free psychophysical methods permit us to regard the contrast sensitivity as a direct measure of the subject's visual performance, independent of subjective
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Contrast sensitivity in radial keratotomy
Acta Ophthalmologica, 1991Abstract In a prospective study, contrast sensitivity function was determined before and one month post‐surgery in 15 consecutive cases of radial keratotomy. The results obtained pre‐operatively were compared to those of an age‐matched, emmetropic reference group also comprising 15 persons. Three different test conditions were employed.
Hanne Olsen, Jørgen Goul Andersen
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Contrast Sensitivity and Glaucoma
1983In the past, our clinical methods of testing vision in glaucoma have, for the most part, been limited to routine light-sense perimetry in which we measure differential lights sensitivity at selected loci in the field of vision. Such testing has disclosed that glaucomatous impairment of light sensitivity usually begins in the paracentral and nasal ...
C. D. Phelps, M. A. Motolko
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Contrast Sensitivity After Epikeratophakia
Cornea, 1988Epikeratophakia is a rapidly evolving surgical procedure for the refractive correction of aphakia. Even when Snellen acuity after epikeratophakia is normal, patients often report a subjective degradation of the visual image through the surgically corrected eye.
Craig W. Adams +3 more
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Contrast sensitivity in diabetic pregnancy
Graefe's Archive for Clinical and Experimental Ophthalmology, 1997To evaluate the correlation between the changes in contrast sensitivity and retinopathy throughout pregnancy in diabetic women with mild background diabetic retinopathy.Contrast sensitivity (Vistech 6500 Contrast Test System) was measured in 22 type I diabetic women with mild background retinopathy [0-16 microaneurysms (MAs)/eye and occasional small ...
Timo Hellstedt +3 more
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Examination of Contrast Sensitivity
2016A very important ability of ours is that we can recognize relatively small objects. An ability of no less importance is that we can perceive little differences in brightness without a sharp edge. The first ability is measured with the examination of visual acuity, whereas the second one, with that of contrast sensitivity.
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