A quantitative evaluation of the optic disc ischemia

The paper describes a method based on numeric techniques far image processing that can be used to determine the degree of the retinal ischemia. On the digital images obtained from fundus fluorescein angiography two regions of interest are selected and processed to obtain the ratio of photometric values of the two sets of pixels; this numerical ratio is used as an index of the disease. The semiautomatic method has been compared witb visual interpretation of fluorangiograms and a good agreement has been found. The described procedure has been developed on a general purpose processor and can be implemented on dedicated systems for digital fluorescein angiography.