Optical coherence tomography speckle reduction by a partially spatially coherent source

Jeehyun Kim; Donald T. Miller; Eunha K. Kim; Sanghoon Oh; Jung Hwan Oh; Thomas E. Milner

doi:10.1117/1.2138031

1 November 2005 Optical coherence tomography speckle reduction by a partially spatially coherent source

Jeehyun Kim, Donald T. Miller, Eunha K. Kim, Sanghoon Oh, Jung Hwan Oh, Thomas E. Milner

Author Affiliations +

Journal of Biomedical Optics, Vol. 10, Issue 6, 064034 (November 2005). https://doi.org/10.1117/1.2138031

Abstract

Speckle in optical coherence tomography (OCT) images originates in the high spatial coherence of incident light that enables interference of light backscattered from spatially heterogenous tissue specimens. We report results of a numerical simulation and an experiment to test speckle reduction using a partially spatially coherent source. A Gaussian-Schell model for a partially spatially coherent source is used in the OCT simulation. For the experiment, such a source was generated by a spatially coherent boardband light source and a multimode fiber. The advantage of using a multimode fiber in combination with a broadband source is the large number of photons per coherence volume. To illustrate speckle reduction with a partially spatially coherent source, we record low-coherence interferograms of a scattering surface using single-mode and multimode source fibers. Interferograms recorded using a single-mode source fiber are indicative of those observed using conventional OCT. Speckle in OCT images recorded using a multimode source fiber is substantially reduced.

©(2005) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Jeehyun Kim, Donald T. Miller, Eunha K. Kim, Sanghoon Oh, Jung Hwan Oh, and Thomas E. Milner "Optical coherence tomography speckle reduction by a partially spatially coherent source," Journal of Biomedical Optics 10(6), 064034 (1 November 2005). https://doi.org/10.1117/1.2138031

Published: 1 November 2005

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KEYWORDS

Speckle

Optical coherence tomography

Multimode fibers

Optical fibers

Spatial coherence

CCD cameras

Light

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