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Comparison of Cysts in Red and Green Images for Diabetic Macular Edema
Indiana University, USA.
Indiana University, USA;Aeon Imaging, USA.
Indiana University, USA.
Vise andre og tillknytning
2017 (engelsk)Inngår i: Optometry and Vision Science, ISSN 1040-5488, E-ISSN 1538-9235, Vol. 94, nr 2, s. 137-149Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Purpose: To investigate whether cysts in diabetic macular edema are better visualized in the red channel of color fundus camera images, as compared with the green channel, because color fundus camera screening methods that emphasize short-wavelength light may miss cysts in patients with dark fundi or changes to outer blood retinal barrier.

Methods: Fundus images for diabetic retinopathy photoscreening were acquired for a study with Aeon Imaging, EyePACS, University of California Berkeley, and Indiana University. There were 2047 underserved, adult diabetic patients, of whom over 90% self-identified as a racial/ethnic identify other than non-Hispanic white. Color fundus images at nominally 45 degrees were acquired with a Canon Cr-DGi non-mydriatic camera (Tokyo, Japan) then graded by an EyePACS certified grader. From the 148 patients graded to have clinically significant macular edema by the presence of hard exudates in the central 1500 [mu]m of the fovea, we evaluated macular cysts in 13 patients with cystoid macular edema. Age ranged from 33 to 68 years. Color fundus images were split into red, green, and blue channels with custom Matlab software (Mathworks, Natick, MA). The diameter of a cyst or confluent cysts was quantified in the red-channel and green-channel images separately.

Results: Cyst identification gave complete agreement between red-channel images and the standard full-color images. This was not the case for green-channel images, which did not expose cysts visible with standard full-color images in five cases, who had dark fundi. Cysts appeared more numerous and covered a larger area in the red channel (733 +/- 604 [mu]m) than in the green channel (349 +/- 433 [mu]m, p < 0.006).

Conclusions: Cysts may be underdetected with the present fundus camera methods, particularly when short-wavelength light is emphasized or in patients with dark fundi. Longer wavelength techniques may improve the detection of cysts and provide more information concerning the early stages of diabetic macular edema or the outer blood retinal barrier.

sted, utgiver, år, opplag, sider
2017. Vol. 94, nr 2, s. 137-149
Emneord [en]
diabetic retinopathy, diabetic macular edema, clinically significant macular edema, retina imaging, light tissue interactions, cystoid macular edema, color fundus photography, diabetic retinal screening
HSV kategori
Forskningsprogram
Naturvetenskap, Optometri
Identifikatorer
URN: urn:nbn:se:lnu:diva-58221DOI: 10.1097/OPX.0000000000001010OAI: oai:DiVA.org:lnu-58221DiVA, id: diva2:1048134
Tilgjengelig fra: 2016-11-20 Laget: 2016-11-20 Sist oppdatert: 2019-06-10bibliografisk kontrollert

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