Imaging of the human choroid with a 1.7 MHz A-scan rate FDML swept source OCT system

I. Gorczynska; J. V. Migacz; R. Jonnal; R. J. Zawadzki; R. Poddar; J. S. Werner

doi:10.1117/12.2251704

8 February 2017 Imaging of the human choroid with a 1.7 MHz A-scan rate FDML swept source OCT system

I. Gorczynska, J. V. Migacz, R. Jonnal, R. J. Zawadzki, R. Poddar, J. S. Werner

Proceedings Volume 10045, Ophthalmic Technologies XXVII; 1004510 (2017) https://doi.org/10.1117/12.2251704
Event: SPIE BiOS, 2017, San Francisco, California, United States

Abstract

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 imaging.

Conference Presentation

Citation Download Citation

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 (8 February 2017); https://doi.org/10.1117/12.2251704

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