The preprocessing of retinal images for the detection of fluorescein leakage

被引:30
作者
Cree, MJ
Olson, JA
McHardy, KC
Sharp, PF
Forrester, JV
机构
[1] Univ Aberdeen, Dept Biomed Phys & Bioengn, Aberdeen AB9 2ZD, Scotland
[2] Aberdeen Royal Infirm, Eye Clin, Aberdeen, Scotland
[3] Royal Infirm, Diabet Clin, Aberdeen, Scotland
[4] Univ Aberdeen, Dept Ophthalmol, Aberdeen, Scotland
关键词
D O I
10.1088/0031-9155/44/1/021
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Images of the human retina are routinely used in clinical practice for the diagnosis and management of eye disease. Increased permeability of retinal brood vessels, which is a clinically significant feature, can be visualized with a process known as fluorescein angiography as leakage of fluorescence dye into the surrounding tissues. Analyses of such images can be quantified but significant degradation of images due to uneven illumination or occluded optical pathways is often incurred during image capture. We describe a procedure to restore fluorescein angiographic retinal images so that quantitative computation can be reliably performed. Analysis of the image acquisition system reveals that captured images are composed of two functions, one describing the true underlying image and the other the degradation incurred. These two functions are independent of one another and it is possible to estimate the degradation from an isolated captured image and restore it appropriately Any leakage of fluorescein dye is then detected by analysing the restored angiographic sequence over time and finding areas of the image that do not have the usual decrease in fluorescence intensity.
引用
收藏
页码:293 / 308
页数:16
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