Design criteria in choosing optimized OCT scanning regimes

Carla Carmelo Rosa; John Rogers; Justin Pedro; Richard Rosen M.D.; Adrian Podoleanu

doi:10.1117/12.728400

11 July 2007 Design criteria in choosing optimized OCT scanning regimes

Carla Carmelo Rosa, John Rogers, Justin Pedro, Richard Rosen M.D., Adrian Podoleanu

Proceedings Volume 6627, Optical Coherence Tomography and Coherence Techniques III; 66271E (2007) https://doi.org/10.1117/12.728400
Event: European Conferences on Biomedical Optics, 2007, Munich, Germany

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.

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Carla Carmelo Rosa, John Rogers, Justin Pedro, Richard Rosen M.D., and Adrian Podoleanu "Design criteria in choosing optimized OCT scanning regimes", Proc. SPIE 6627, Optical Coherence Tomography and Coherence Techniques III, 66271E (11 July 2007); https://doi.org/10.1117/12.728400

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KEYWORDS

Optical coherence tomography

Safety

Image quality

Retina

Imaging systems

Eye

Image resolution

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