Numerical correction of bi-directional scanning distortion in FDML OCT

Mohammad Shahidul Islam; Yusi Miao; Myeong Jin Ju

doi:10.1117/12.3005753

13 March 2024 Numerical correction of bi-directional scanning distortion in FDML OCT

Mohammad Shahidul Islam, Yusi Miao, Myeong Jin Ju

Author Affiliations +

Proceedings Volume PC12830, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXVIII; PC128301N (2024) https://doi.org/10.1117/12.3005753
Event: SPIE BiOS, 2024, San Francisco, California, United States

Conference Poster

Abstract

Optical Coherence Tomography (OCT) is a non-invasive imaging technique, essential in medical diagnostics due to its ability to produce high-resolution images of internal structures of biological tissues. One of the unique features of the FDML based MHz-OCT is the optical buffering that increases the A-scan rate by creating successive time-delayed copies of the original sweep. However, due to the optical buffering, numerous studies have reported that A-lines originates from different buffer can have different amplitude and phase. Another challenge associated with high A-scan laser source is to pair with the high-speed mechanical scanning protocol to avoid oversampling. Most of the FDML based OCT system is oversampled due to the mechanical limitation of the galvanometer. In this paper, an optimization method is applied to the backward scanning data to eliminate the distortions. Moreover, the phase and amplitude misalignment issues are also numerically corrected. The amplitude inconsistencies in the acquired interferogram are also addressed and solved.

Citation Download Citation

Mohammad Shahidul Islam, Yusi Miao, and Myeong Jin Ju "Numerical correction of bi-directional scanning distortion in FDML OCT", Proc. SPIE PC12830, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXVIII, PC128301N (13 March 2024); https://doi.org/10.1117/12.3005753

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