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Optical Review

, Volume 25, Issue 2, pp 227–236 | Cite as

Polarimetric imaging of turbid inhomogeneous slab media based on backscattering using a pencil beam for illumination: Monte Carlo simulation

  • Soichi Otsuki
Regular Paper
  • 122 Downloads

Abstract

Polarimetric imaging of absorbing, strongly scattering, or birefringent inclusions is investigated in a negligibly absorbing, moderately scattering, and isotropic slab medium. It was proved that the reduced effective scattering Mueller matrix is exactly calculated from experimental or simulated raw matrices even if the medium is anisotropic and/or heterogeneous, or the outgoing light beam exits obliquely to the normal of the slab surface. The calculation also gives a reasonable approximation of the reduced matrix using a light beam with a finite diameter for illumination. The reduced matrix was calculated using a Monte Carlo simulation and was factorized in two dimensions by the Lu–Chipman polar decomposition. The intensity of backscattered light shows clear and modestly clear differences for absorbing and strongly scattering inclusions, respectively, whereas it shows no difference for birefringent inclusions. Conversely, some polarization parameters, for example, the selective depolarization coefficients exhibit only a slight difference for the absorbing inclusions, whereas they showed clear difference for the strongly scattering or birefringent inclusions. Moreover, these quantities become larger with increasing the difference in the optical properties of the inclusions relative to the surrounding medium. However, it is difficult to recognize inclusions that buried at the depth deeper than 3 mm under the surface. Thus, the present technique can detect the approximate shape and size of these inclusions, and considering the depth where inclusions lie, estimate their optical properties. This study reveals the possibility of the polarization-sensitive imaging of turbid inhomogeneous media using a pencil beam for illumination.

Keywords

Polarimetric imaging Backscattering Multiple scattering Light propagation in tissues Monte Carlo simulation 

Notes

Acknowledgements

This research was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI (JP26390092).

Compliance with Ethical Standards

Disclosures

The corresponding author states that there is no conflict of interest.

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Copyright information

© The Optical Society of Japan 2018

Authors and Affiliations

  1. 1.Kansai CenterNational Institute of Advanced Industrial Science and Technology (AIST)IkedaJapan

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