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Proceedings Paper

Design criteria in choosing optimized OCT scanning regimes
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Paper Abstract

A comparative analysis on the performance of different scanning regimes in time domain optical coherence tomography is presented in terms of image size. Safety thresholds due to the different continuous irradiation time per transverse pixel in different scanning regimes are also considered. We present the maximum exposure level for a variety of scanning procedures, employing either A scanning (depth priority) or T scanning (transverse priority) when generating cross section images, en-face images or collecting 3D volumes. We present a comparison between such B-scan images, and different criteria to allow the user to choose the right mode of operation. Mainly, two criteria are detailed, a scanning criterion and a safety criterion. The scanning criterion depends on the number of pixels along the lateral and axial directions. The analysis shows that en-face scanning allows wider images while the longitudinal scanning is more suitable to deep cross sections. The safety criterion refers to safety levels to be observed in each scanning mode. We show that the flying spot OCT imaging has different safety limits for T- and A- based imaging modes. The analysis leads to maximum permissible optical power levels that favors T-scan imaging of wide objects. We then apply the analysis considering as object the eye.

Paper Details

Date Published: 11 July 2007
PDF: 9 pages
Proc. SPIE 6627, Optical Coherence Tomography and Coherence Techniques III, 66271E (11 July 2007);
Show Author Affiliations
Carla Carmelo Rosa, Univ. of Porto (Portugal)
INESC-Porto (Portugal)
John Rogers, Ophthalmic Technologies Inc. (Canada)
Justin Pedro, Ophthalmic Technologies Inc. (Canada)
Richard Rosen M.D., New York Eye Infirmary (United States)
Adrian Podoleanu, Univ. of Kent (United Kingdom)

Published in SPIE Proceedings Vol. 6627:
Optical Coherence Tomography and Coherence Techniques III
Peter E. Andersen; Zhongping Chen, Editor(s)

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