Colleen A. Wilson

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We have quantified retinal edema in rat by specific gravity measurements in vitro. Specific gravity corresponds to tissue water content, which is increased in retinal edema. The gravimetric analysis of retinal edema corresponds well with light and transmission electron microscopy and radiolabelled albumen studies. Specific gravity measurements are the(More)
We report on the evolution of key spectral and temporal parameters of SGR 1806À20 prior to and following the highly energetic giant flare of 2004 December 27. Using RXTE, we track the pulse frequency of the SGR and find that the spin-down rate varied erratically in the months before and after the flare. Contrary to the giant flare in SGR 1900+14, we find no(More)
Experimental occlusion of the central retinal vessels in albino rats followed by reperfusion for 2 or 4 days resulted in a highly active proliferative response. Mitotic figures were produced in retinal vascular cells, presumed Müller cells, retinal pigment epithelial cells, and possibly other cell populations in the retina. A large number of mitoses were(More)
Dye-sensitized photochemical thrombosis is a new method of producing vascular occlusion in the eye for experimental purposes. The rate and duration of photodynamic occlusions of branch retinal vessels was measured in pigmented and albino rat eyes after intravenous injection of the photosensitizing dye, rose bengal. Selected vessels were exposed to focused,(More)
Retinal hypoxia is hypothesized to initiate angiogenesis, a leading cause of blindness in developed countries. Attempts to test this hypothesis suffer from the need to use highly invasive oxygen electrodes. In this communication, noninvasive and quantitative mapping of ocular oxygenation using magnetic resonance imaging is demonstrated for the first time.
Recent magnetic resonance imaging (MRI) studies show that gadolinium-diethylenetriaminepentaacetic acid (Gd-DTPA) entry into the vitreous space can be used as a qualitative marker of blood-retinal barrier (BRB) disruption. To determine if a more quantitative measurement of BRB breakdown could be obtained, the utility of acquiring real-time, T1-weighted(More)
Contrast-enhanced magnetic resonance imaging (MRI) is a promising method for investigating the breakdown of the blood-retinal barrier (BRB). However, subtle intensity changes due to low concentrations of contrast agent can be difficult to detect without observer bias. In this study, we developed a temporal correlation method for detecting these subtle(More)
We have quantitatively determined the PO2 within the vitreous space of the vitrectomized rabbit eye in vivo using 19F NMR and perfluorotributylamine (FTBA). The results of the present work are in good agreement with previous measurements of PO2 within the nonvitrectimized rabbit eye obtained using oxygen microelectrodes. In this study, good precision and(More)
Breakdown of the blood-retinal barrier (BRB), frequently an early clinical sign in retinopathy, can be accurately determined using contrast-enhanced MRI. However, increased vitreous fluidity with age and disease may affect the accuracy of the MRI method. We compared the permeability surface area product per area of leaky retina in eyes with normal vitreous(More)
PURPOSE Endophthalmitis is a severe inflammatory disorder with profound visual consequences. Treatment of this disorder has been limited by the lack of quantitative information regarding retinal responses to severe inflammation. The purpose of this study was to measure the effect of endotoxin-induced endophthalmitis on blood-retinal barrier (BRB) function(More)