Polarization‐multiplexed,dual‐beam swept source optical coherence tomography angiography |
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Authors: | Jianlong Yang Rahul Chandwani Rui Zhao Zhuo Wang Yali Jia David Huang Gangjun Liu |
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Institution: | Casey Eye Institute, Oregon Health and Science University, Portland, Oregon |
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Abstract: | A polarization‐multiplexed, dual‐beam setup is proposed to expand the field of view (FOV) for a swept source optical coherence tomography angiography (OCTA) system. This method used a Wollaston prism to split sample path light into 2 orthogonal‐polarized beams. This allowed 2 beams to shine on the cornea at an angle separation of ~14°, which led to a separation of ~4.2 mm on the retina. A 3‐mm glass plate was inserted into one of the beam paths to set a constant path length difference between the 2 polarized beams so the interferogram from the 2 beams are coded at different frequency bands. The resulting OCTA images from the 2 beams were coded with a depth separation of ~2 mm. A total of 5 × 5 mm2 angiograms from the 2 beams were obtained simultaneously in 4 seconds. The 2 angiograms then were montaged to get a wider FOV of ~5 × 9.2 mm2. ![image](//wol-prod-cdn.literatumonline.com/cms/attachment/337fef4a-b7e5-40ca-9a60-ad07a8504f75/jbio201700303-gra-0001.png) |
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Keywords: | medical and biological imaging ophthalmic optics and devices optical coherence tomography |
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