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Proceedings Paper

Digital processing of noisy OCT signals in phase space
Author(s): Kin Man Yung; Joseph M. Schmitt; Siu Lung Lee
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Paper Abstract

OCT images, like those produced by ultrasound scanners, are contaminated with speckles. Speckle in OCT images occurs when light waves reflected by pairs of scatterers spaced by a distance of approximately (k + 1/2) (lambda) , for any integer k, add destructively to give a signal of very small amplitude. Rapid phase changes indicate the locations at which speckle occurs in OCT A-line signals. These changes can be detected by obtaining the unwrapped phase angle of quadrature- demodulated signals or zeros of z-transform of windowed A- lines. This paper discusses a zero-adjustment procedure (ZAP) that is capable of detecting and reducing speckle with the help of the signal phase. The method is evaluated on an analytical model and applied to OCT images of living skin.

Paper Details

Date Published: 24 April 1998
PDF: 10 pages
Proc. SPIE 3251, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications II, (24 April 1998); doi: 10.1117/12.306050
Show Author Affiliations
Kin Man Yung, Hong Kong Univ. of Science and Technology (Hong Kong)
Joseph M. Schmitt, Hong Kong Univ. of Science and Technology (United States)
Siu Lung Lee, Hong Kong Univ. of Science and Technology (Hong Kong)


Published in SPIE Proceedings Vol. 3251:
Coherence Domain Optical Methods in Biomedical Science and Clinical Applications II
Valery V. Tuchin; Joseph A. Izatt, Editor(s)

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