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Proceedings Paper

Parallel scanning light ophthalmoscope for retinal imaging (Conference Presentation)
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Paper Abstract

Scanning laser ophthalmoscopy is a confocal imaging technique that allows high-contrast imaging of retinal structures. Rapid, involuntary eye movements during image acquisition are known to cause artefacts and high-speed imaging of the retina is crucial to avoid them. To reach higher imaging speeds we propose to illuminate the retina with multiple parallel lines simultaneously within the whole field of view (FOV) instead of a single focused line that is raster-scanned. These multiple line patterns were generated with a digital micro-mirror device (DMD) and by shifting the line pattern, the whole FOV is scanned. The back-scattered light from the retinal layers is collected via a beam-splitter and imaged onto an area camera. After every pattern from the sequence is projected, the final image is generated by combining these back-reflected illumination patterns. Image processing is used to remove the background and out-of-focus light. Acquired pattern images are stacked, pixels sorted according to intensity and finally bottom layer of the stack is subtracted from the top layer to produce confocal image. The obtained confocal images are rich in structure, showing the small blood vessels around the macular avascular zone and the bow tie of Henle's fiber layer in the fovea. In the optic nerve head images the large arteries/veins, optic cup rim and cup itself are visualized. Images have good contrast and lateral resolution with a 10°×10° FOV. The initial results are promising for the development of high-speed retinal imaging using spatial light modulators such as the DMD.

Paper Details

Date Published: 26 April 2016
PDF: 1 pages
Proc. SPIE 9693, Ophthalmic Technologies XXVI, 96930R (26 April 2016); doi: 10.1117/12.2205247
Show Author Affiliations
Kari V. Vienola, Vrije Univ. Amsterdam (Netherlands)
Rotterdam Ophthalmic Institute (Netherlands)
Mathivanan Damodaran, Vrije Univ. Amsterdam (Netherlands)
Boy Braaf, Vrije Univ. Amsterdam (Netherlands)
Koenraad A. Vermeer, Rotterdam Ophthalmic Institute (Netherlands)
Johannes F. de Boer, Vrije Univ. Amsterdam (Netherlands)

Published in SPIE Proceedings Vol. 9693:
Ophthalmic Technologies XXVI
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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