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Investigation of a probe design for facilitating the uses of the standard photon diffusion equation at short source-detector separations: Monte Carlo simulations

J. Biomed. Opt. 14, 054043 (Oct 30, 2009); http://dx.doi.org/10.1117/1.3253386

Sheng-Hao Tseng

National Cheng-Kung University, Department of Electro-Optical Engineering, 1 University Road, Tainan, Taiwan 701

Carole Hayakawa, Jerome Spanier, and Anthony J. Durkin

University of California, Irvine, Beckman Laser Institute, Laser Microbeam and Medical Program, 1002 Health Sciences Road, Irvine, California 92617

We design a special diffusing probe to investigate the optical properties of human skin in vivo. The special geometry of the probe enables a modified two-layer (MTL) diffusion model to precisely describe the photon transport even when the source-detector separation is shorter than 3 mean free paths. We provide a frequency domain comparison between the Monte Carlo model and the diffusion model in both the MTL geometry and conventional semiinfinite geometry. We show that using the Monte Carlo model as a benchmark method, the MTL diffusion theory performs better than the diffusion theory in the semiinfinite geometry. In addition, we carry out Monte Carlo simulations with the goal of investigating the dependence of the interrogation depth of this probe on several parameters including source-detector separation, sample optical properties, and properties of the diffusing high-scattering layer. From the simulations, we find that the optical properties of samples modulate the interrogation volume greatly, and the source-detector separation and the thickness of the diffusing layer are the two dominant probe parameters that impact the interrogation volume. Our simulation results provide design guidelines for a MTL geometry probe.

© 2009 Society of Photo-Optical Instrumentation Engineers

History
Received May 07, 2009
Accepted Aug 28, 2009
Revised Aug 26, 2009
Published online Oct 30, 2009
Citation
Sheng-Hao Tseng, Carole Hayakawa, Jerome Spanier and Anthony J. Durkin, "Investigation of a probe design for facilitating the uses of the standard photon diffusion equation at short source-detector separations: Monte Carlo simulations", J. Biomed. Opt. 14, 054043 (Oct 30, 2009); http://dx.doi.org/10.1117/1.3253386

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