20 November 2014 Dual illumination OCT at 1050nm and 840nm for whole eye segment imaging
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We presented an improved dual channel dual focus spectral domain optical coherence tomography (SD-OCT) with two illuminations at 840 nm and 1050 nm for whole eye segment imaging and biometry in vivo. The two light beams were coupled and optically optimized to scan the anterior and posterior segment of the eye simultaneously. This configuration with dichroic mirrors integrated in the sample arm enables us to acquire images from the anterior segment and retina effectively with minimum loss of sample signal. In addition, the full resolved complex (FRC) method was applied to double the imaging depth for the whole anterior segment imaging by eliminating the mirror image. The axial resolution for 1050 nm and 840 nm OCT was 14 μm and 8 μm in air, respectively. Finally, the system was successfully tested in imaging the unaccommodated and accommodated eyes. The preliminary results demonstrated the significant improvements comparing with our previous dual channel SD-OCT configuration in which the two probing beams had the same central wavelength of 840 nm.
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Shanhui Fan, Lin Qin, Cuixia Dai, Chuanqing Zhou, "Dual illumination OCT at 1050nm and 840nm for whole eye segment imaging", Proc. SPIE 9268, Optics in Health Care and Biomedical Optics VI, 92682O (20 November 2014); doi: 10.1117/12.2073620; https://doi.org/10.1117/12.2073620

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