A1 Refereed original research article in a scientific journal
Digital micromirror device based ophthalmoscope with concentric circle scanning
Authors: Damodaran M, Vienola KV, Braaf B, Vermeer KA, de Boer JF
Publisher: Optica Publishing Group
Publication year: 2017
Journal: Biomedical Optics Express
Journal name in source: BIOMEDICAL OPTICS EXPRESS
Journal acronym: Biomed. Opt. Express
Volume: 8
Issue: 5
First page : 2766
Last page: 2780
Number of pages: 15
ISSN: 2156-7085
DOI: https://doi.org/10.1364/BOE.8.002766
Web address : https://opg.optica.org/boe/fulltext.cfm?uri=boe-8-5-2766&id=363564
Abstract
Retinal imaging is demonstrated using a novel scanning light ophthalmoscope based on a digital micromirror device with 810 nm illumination. Concentric circles were used as scan patterns, which facilitated fixation by a human subject for imaging. An annular illumination was implemented in the system to reduce the background caused by corneal reflections and thereby to enhance the signal-to-noise ratio. A 1.9-fold increase in the signal-to-noise ratio was found by using an annular illumination aperture compared to a circular illumination aperture, resulting in a 5-fold increase in imaging speed and a better signal-to-noise ratio compared to our previous system. We tested the imaging performance of our system by performing non-mydriatic imaging on two subjects at a speed of 7 Hz with a maximum 20 degrees (diameter) field of view. The images were shot noise limited and clearly show various anatomical features of the retina with high contrast. (C) 2017 Optical Society of America.
Retinal imaging is demonstrated using a novel scanning light ophthalmoscope based on a digital micromirror device with 810 nm illumination. Concentric circles were used as scan patterns, which facilitated fixation by a human subject for imaging. An annular illumination was implemented in the system to reduce the background caused by corneal reflections and thereby to enhance the signal-to-noise ratio. A 1.9-fold increase in the signal-to-noise ratio was found by using an annular illumination aperture compared to a circular illumination aperture, resulting in a 5-fold increase in imaging speed and a better signal-to-noise ratio compared to our previous system. We tested the imaging performance of our system by performing non-mydriatic imaging on two subjects at a speed of 7 Hz with a maximum 20 degrees (diameter) field of view. The images were shot noise limited and clearly show various anatomical features of the retina with high contrast. (C) 2017 Optical Society of America.
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