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Renormalization of the highly forward-peaked phase function using the double exponential formula for radiative transfer

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Abstract

Numerical calculation of photon migration in biological tissue using the radiative transfer equation (RTE) has attracted great interests in biomedical optics and imaging. Because biological tissue is a highly forward-peaked scattering medium, renormalization of the phase function in numerical calculation of the RTE is crucial. This paper proposes a simple approach of renormalizing the phase function by the double exponential formula, which was heuristically modified from the original one. Firstly, the validity of the proposed approach was tested by comparing numerical results for an average cosine of the polar scattering angle calculated by the proposed approach with those by the conventional approach in highly forward-peaked scattering. The results show that calculation of the average cosine converged faster using the proposed approach than using the conventional one as a total number of discrete angular directions increases. Next, the accuracy of the numerical solutions of the RTE using the proposed approach was examined by comparing the numerical solutions with the analytical solutions of the RTE in a homogeneous medium with highly forward-peaked scattering. It was found that the proposed approach reduced the errors of the numerical solutions from those using the conventional one especially at a small value of the total number of the directions. This result suggests that the proposed approach has a possibility to improve the accuracy for the numerical results of the RTE in the highly scattering medium.

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Acknowledgments

This work was partially supported by JSPS KAKENHI Grant No.15K17980, 15K06125, and 25287028; and by Japan Agency for Medical Research and Development.

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Authors and Affiliations

  1. Division of Mechanical and Space Engineering, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido, 060-8628, Japan

    Hiroyuki Fujii & Masao Watanabe

  2. National Defense Medical College, 3-2 Namiki, Tokorozawa, Saitama, 359-8513, Japan

    Shinpei Okawa

  3. Brain Science Inspired Life Support Research Center, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo, 182-8585, Japan

    Yukio Yamada

  4. Preeminent Medical Photonics Education and Reseach Center, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka, 431-3192, Japan

    Yoko Hoshi

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  1. Hiroyuki Fujii
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  2. Shinpei Okawa
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  3. Yukio Yamada
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  4. Yoko Hoshi
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  5. Masao Watanabe
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Correspondence to Hiroyuki Fujii.

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Fujii, H., Okawa, S., Yamada, Y. et al. Renormalization of the highly forward-peaked phase function using the double exponential formula for radiative transfer. J Math Chem 54, 2048–2061 (2016). https://doi.org/10.1007/s10910-016-0670-3

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  • DOI: https://doi.org/10.1007/s10910-016-0670-3

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