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Proceedings Paper

Non-mydriatic confocal retinal imaging using a digital light projector
Author(s): Matthew S. Muller; Jason J. Green; Karthikeyan Baskaran; Allen W. Ingling; Jeffrey L. Clendenon; Thomas J. Gast; Ann E. Elsner
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Paper Abstract

A digital light projector is implemented as an integrated illumination source and scanning element in a confocal nonmydriatic retinal camera, the Digital Light Ophthalmoscope (DLO). To simulate scanning, a series of illumination lines are rapidly projected on the retina. The backscattered light is imaged onto a 2-dimensional rolling shutter CMOS sensor. By temporally and spatially overlapping the illumination lines with the rolling shutter, confocal imaging is achieved. This approach enables a low cost, flexible, and robust design with a small footprint. The 3rd generation DLO technical design is presented, using a DLP LightCrafter 4500 and USB3.0 CMOS sensor. Specific improvements over previous work include the use of yellow illumination, filtered from the broad green LED spectrum, to obtain strong blood absorption and high contrast images while reducing pupil constriction and patient discomfort.

Paper Details

Date Published: 10 March 2015
PDF: 10 pages
Proc. SPIE 9376, Emerging Digital Micromirror Device Based Systems and Applications VII, 93760E (10 March 2015); doi: 10.1117/12.2077704
Show Author Affiliations
Matthew S. Muller, Aeon Imaging, LLC (United States)
Jason J. Green, Indiana Univ. (United States)
Karthikeyan Baskaran, Indiana Univ. (United States)
Allen W. Ingling, Aeon Imaging, LLC (United States)
Jeffrey L. Clendenon, Aeon Imaging, LLC (United States)
Thomas J. Gast, Aeon Imaging, LLC (United States)
Ann E. Elsner, Aeon Imaging, LLC (United States)
Indiana Univ. (United States)

Published in SPIE Proceedings Vol. 9376:
Emerging Digital Micromirror Device Based Systems and Applications VII
Michael R. Douglass; Philip S. King; Benjamin L. Lee, Editor(s)

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