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COMPARISON OF 3 MM × 3 MM VERSUS 6 MM × 6 MM OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY SCAN SIZES IN THE EVALUATION OF NON–PROLIFERATIVE DIABETIC RETINOPATHY
Published Web Location
https://doi.org/10.1097/iae.0000000000001951Abstract
Purpose
To evaluate the utility of different optical coherence tomography angiography scan protocols in evaluating retinal changes in non-proliferative diabetic retinopathy.Methods
Patients were imaged with the RTVue XR Avanti OCT 3 mm × 3 mm and 6 mm × 6 mm "Angio Retina" scan protocols. Ability to clearly delineate the foveal avascular zone (FAZ), FAZ remodeling, microaneurysms, capillary nonperfusion, motion, and doubling artifacts were evaluated.Results
Forty-six eyes from 27 patients were enrolled. Eighty-nine percent of 3 mm × 3 mm versus 59% of 6 mm × 6 mm scans clearly delineated the FAZ (P = 0.001). Eighty percent of 3 mm × 3 mm versus 43% of 6 mm × 6 mm scans demonstrated FAZ remodeling (P = 0.0002). Microaneurysms were detected by 57% of 6 mm × 6 mm and 35% of 3 mm × 3 mm scans (P = 0.003). Capillary nonperfusion was detected in 87% of 3 mm × 3 mm scans versus 89% of 6 mm × 6 mm scans (P = 0.99). No significant differences were noted in the incidence of artifacts between the scan sizes (motion artifact P = 0.29 and doubling artifact P = 0.29).Conclusion
3 mm × 3 mm scan delineated FAZ and remodeling better than 6 mm × 6 mm scan, likely because of its higher scan density. 6 mm × 6 mm scans detected microaneurysms more readily than 3 mm × 3 mm, likely because of its larger scan area. There were utility for both 3 mm × 3 mm and 6 mm × 6 mm scans when evaluating these patients.Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.
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