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Proceedings Paper

Detection and characterization of an optical inhomogeneity by diffuse photon-pairs density wave in a multiple-scattering medium
Author(s): Li-Ping Yu; Jheng-Syong Wu; Yi-Hsin Chan; Li-Chen Su; Chien Chou
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Paper Abstract

Conventionally, the detection and characterization of an optical inhomogeneity embedded in turbid media is dependent on the perturbation of diffuse photon density wave (DPDW) and its noise level, which is defined as the signal-to-noise ratio (SNR). In this study, we calculate the limitation of detection and characterization by using diffuse photon-pairs density wave (DPPDW) which is a novel method in studying turbid media. DPPDW is produced by linear polarized photon-pairs (LPPPs) laser beam which experience multiple-scattering events in turbid media. Meanwhile, the fractional amplitude and phase noise in detecting heterodyne signal determine the detection and characterization of DPPDW in a multiple scattering medium. The amplitude attenuation and phase change of heterodyne signal of DPPDW and their SNR analysis are demonstrated and discussed. As a result, we anticipate that the properties of DPPDW depending upon the degree of spatial coherence (DOC) and the degree of polarization (DOP) of LPPPs in turbid media can result in an improvement on detection and then the perturbation of DPPDW produced by an inhomogeneity embedded in a multiple scattering medium is able to be measured.

Paper Details

Date Published: 12 July 2007
PDF: 11 pages
Proc. SPIE 6629, Diffuse Optical Imaging of Tissue, 66290F (12 July 2007); doi: 10.1117/12.728617
Show Author Affiliations
Li-Ping Yu, National Yang Ming Univ. (Taiwan)
Jheng-Syong Wu, National Central Univ. (Taiwan)
Yi-Hsin Chan, Chang Gung Memorial Hospital, Chang Gung Univ. College of Medicine (Taiwan)
Li-Chen Su, National Central Univ. (Taiwan)
Chien Chou, National Yang Ming Univ. (Taiwan)
National Central Univ. (Taiwan)


Published in SPIE Proceedings Vol. 6629:
Diffuse Optical Imaging of Tissue
Brian W. Pogue; Rinaldo Cubeddu, Editor(s)

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