Digital processing of noisy OCT signals in phase space

Kin Man Yung; Joseph M. Schmitt; Siu Lung Lee

doi:10.1117/12.306050

24 April 1998 Digital processing of noisy OCT signals in phase space

Kin Man Yung, Joseph M. Schmitt, Siu Lung Lee

Proceedings Volume 3251, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications II; (1998) https://doi.org/10.1117/12.306050
Event: BiOS '98 International Biomedical Optics Symposium, 1998, San Jose, CA, United States

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.

Citation Download Citation

Kin Man Yung, Joseph M. Schmitt, and Siu Lung Lee "Digital processing of noisy OCT signals in phase space", Proc. SPIE 3251, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications II, (24 April 1998); https://doi.org/10.1117/12.306050

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