Measurement of retinal vessel diameters in images produced by the Heidelberg retinal tomograph

Karen Margaret Joos M.D.; Chasidy Singleton; Jin-Hui Shen

doi:10.1117/12.275112

26 May 1997 Measurement of retinal vessel diameters in images produced by the Heidelberg retinal tomograph

Karen Margaret Joos M.D., Chasidy Singleton, Jin-Hui Shen

Proceedings Volume 2971, Ophthalmic Technologies VII; (1997) https://doi.org/10.1117/12.275112
Event: BiOS '97, Part of Photonics West, 1997, San Jose, CA, United States

Abstract

To determine if a method can be used with the Heidelberg Retinal Tomograph (HRT) to improve measurement of retinal vessel diameters. The HRT was used to acquire 3 consecutive images of the optic nerve head in 7 normal subjects to obtain a mean topographic image. The files were transferred to `CorelPHOTO-PAINT The diameters of vessels with well- defined edges were measured using the `line tool'. Each vessel diameter was measured 5 times, and an average and standard deviation were calculated. Fifty-five arterioles and 49 venules were measured from the 7 normal subjects using `CorelPHOTO-PAINT `interactivemeas' submenu. The standard deviations of the vessels ranged from 0 to 10 microns with the majority less than 5 microns in subjects using `CorelPHOTO-PAINT of the measurable vessels ranged from 2 to 17 microns with the majority greater than 5 microns. The HRT `interactivemeas' submenu permits distance measurements, but it does not enhance the image enough to clearly define the vessel edges. Enlargement and improvement of contrast reduces user error in measuring retinal vessel diameters of HRT topographic images.

Citation Download Citation

Karen Margaret Joos M.D., Chasidy Singleton, and Jin-Hui Shen "Measurement of retinal vessel diameters in images produced by the Heidelberg retinal tomograph", Proc. SPIE 2971, Ophthalmic Technologies VII, (26 May 1997); https://doi.org/10.1117/12.275112

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