We demonstrate OCT angiography (OCTA) and Doppler OCT imaging of the choroid in the eyes of two
healthy volunteers and in a geographic atrophy case. We show that visualization of specific choroidal layers requires
selection of appropriate OCTA methods. We investigate how imaging speed, B-scan averaging and scanning density
influence visualization of various choroidal vessels. We introduce spatial power spectrum analysis of OCT en face
angiographic projections as a method of quantitative analysis of choroicapillaris morphology. We explore the possibility
of Doppler OCT imaging to provide information about directionality of blood flow in choroidal vessels. To achieve
these goals, we have developed OCT systems utilizing an FDML laser operating at 1.7 MHz sweep rate, at 1060 nm
center wavelength, and with 7.5 μm axial imaging resolution. A correlation mapping OCA method was implemented for
visualization of the vessels. Joint Spectral and Time domain OCT (STdOCT) technique was used for Doppler OCT
I. Gorczynska, J. V. Migacz, R. Jonnal, R. J. Zawadzki, R. Poddar, and J. S. Werner, "Imaging of the human choroid with a 1.7 MHz A-scan rate FDML swept source OCT system," Proc. SPIE 10045, Ophthalmic Technologies XXVII, 1004510 (Presented at SPIE BiOS: January 29, 2017; Published: 8 February 2017); https://doi.org/10.1117/12.2251704.
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