Phase resolved digital signal processing in optical coherence tomography

Johannes F. de Boer; Renu Tripathi; Boris Hyle Park; Nader Nassif

doi:10.1117/12.470460

14 June 2002 Phase resolved digital signal processing in optical coherence tomography

Johannes F. de Boer, Renu Tripathi, Boris Hyle Park, Nader Nassif

Proceedings Volume 4619, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI; (2002) https://doi.org/10.1117/12.470460
Event: International Symposium on Biomedical Optics, 2002, San Jose, CA, United States

Abstract

We present phase resolved digital signal processing techniques for Optical Coherence Tomography to correct for the non Gaussian shape of source spectra and for Group Delay Dispersion (GDD). A broadband source centered at 820 nm was synthesized by combining the spectra of two superluminescent diodes to improve axial image resolution in an optical coherence tomography (OCT) system. Spectral shaping was used to reduce the side lobes (ringing) in the axial point spread function due to the non-Gaussian shape of the spectra. Images of onion cells taken with each individual source and the combined sources, respectively, show the improved resolution and quality enhancement in a turbid biological sample. An OCT system operating at 1310 nm was used to demonstrate that the broadening effect of group delay dispersion (GDD) on the coherence function could be eliminated completely by introducing a quadratic phase shift in the Fourier domain of the interferometric signal. The technique is demonstrated by images of human skin grafts with group delay dispersion mismatch between sample and reference arm before and after digital processing.

Citation Download Citation

Johannes F. de Boer, Renu Tripathi, Boris Hyle Park, and Nader Nassif "Phase resolved digital signal processing in optical coherence tomography", Proc. SPIE 4619, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI, (14 June 2002); https://doi.org/10.1117/12.470460

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