Improved accuracy of frequency-domain photon migration close to light source using delta-P1 approximation of the adjustable parameter f

The δ-P1 approximation can improve the accuracy of the diffusion equation in the near field. Usually, the method to determine the fractional forward-scattering peak f in the δ-P1 approximation is to compare the first two moments of the Henyey-Greenstein phase function and those of the δ-Eddington ph...

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Bibliographic Details
Published in:Journal of modern optics 2008-05, Vol.55 (9), p.1375-1386
Main Authors: Chai, Chenggang, Chen, Yaqin, Zeng, Shaoqun, Luo, Qingming
Format: Article
Language:English
Subjects:
light propagation in tissues
near-field
photon density waves
radiative transfer
δ-P1 approximation
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Summary:The δ-P1 approximation can improve the accuracy of the diffusion equation in the near field. Usually, the method to determine the fractional forward-scattering peak f in the δ-P1 approximation is to compare the first two moments of the Henyey-Greenstein phase function and those of the δ-Eddington phase function. The error relative to Monte Carlo estimation still exists within a mean free path using the value f above. To overcome this defect, we put forward a new method to determine the parameter f for improving the accuracy of frequency-domain photon migration in the δ-P1 approximation if the detector is close to a light source. Results demonstrate that the adjustable f δ-P1 approximation can accurately predict photon fluence rate at distances less than half the transport mean free paths from the source.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500340701656304