20 March 2013 Rotational Dove prism scanning dual angle Doppler OCT
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Abstract
Traditional Doppler OCT is highly sensitive to motion artifacts due to the dependence on the Doppler angle. This limits its reproducibility in clinical practice. To overcome this limitation, we use a bidirectional technique with a novel rotating scanning scheme. The volume is probed simultaneously from two distinct illumination directions with variable controlled orientations, allowing reconstruction of the true flow velocity, independently of the vessel orientation. A Dove prism in the sample arm permits a rotation of the illumination directions that can be synchronized with the standard beam steering device. The principle is implemented with Swept Source OCT at 1060nm with 100,000 A-Scans/s. We apply the system to human retinal absolute blood velocity measurement by performing segment and circumpapillary time series scans around the optic nerve head. We also demonstrate microvasculature imaging by calculation of squared intensity differences between successive tomograms.
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Cedric Blatter, Cedric Blatter, Séverine Coquoz, Séverine Coquoz, Branislav Grajciar, Branislav Grajciar, Amardeep S. G. Singh, Amardeep S. G. Singh, René M. Werkmeister, René M. Werkmeister, Leopold Schmetterer, Leopold Schmetterer, Rainer A. Leitgeb, Rainer A. Leitgeb, } "Rotational Dove prism scanning dual angle Doppler OCT", Proc. SPIE 8571, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVII, 857117 (20 March 2013); doi: 10.1117/12.2006242; https://doi.org/10.1117/12.2006242
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