Analyzing the influence of oblique incidence on quantitative backscattering tissue polarimetry: a pilot ex vivo study

Zheng Zhang; Conghui Shao; Honghui He; Chao He; Shaoxiong Liu; Hui Ma

doi:10.1117/1.JBO.28.10.102905

7 August 2023 Analyzing the influence of oblique incidence on quantitative backscattering tissue polarimetry: a pilot ex vivo study

Zheng Zhang, Conghui Shao, Honghui He, Chao He, Shaoxiong Liu, Hui Ma

Author Affiliations +

Journal of Biomedical Optics, Vol. 28, Issue 10, 102905 (August 2023). https://doi.org/10.1117/1.JBO.28.10.102905

Abstract

Significance

Among the available polarimetric techniques, backscattering Mueller matrix (MM) polarimetry provides a promising non-contact and quantitative tool for in vivo tissue detection and clinical diagnosis. To eliminate the surface reflection from the sample cost-effectively, the non-collinear backscattering MM imaging setup always has an oblique incidence. Meanwhile, for practical organ cavities imaged using polarimetric gastrointestinal endoscopy, the uneven tissue surfaces can induce various relative oblique incidences inevitably, which can affect the polarimetry in a complicated manner and needs to be considered for detailed study.

Aim

The purpose of this study is to systematically analyze the influence of oblique incidence on backscattering tissue polarimetry.

Approach

We measured the MMs of experimental phantom and ex vivo tissues with different incident angles and adopted a Monte Carlo simulation program based on cylindrical scattering model for further verification and analysis. Meanwhile, the results were quantitatively evaluated using the Fourier transform, basic statistics, and frequency distribution histograms.

Results

Oblique incidence can induce different changes on non-periodic, two-periodic, and four-periodic MM elements, leading to false-positive and false-negative polarization information for tissue polarimetry. Moreover, a prominent oblique incidence can bring more dramatic signal variations, such as phase retardance and element transposition.

Conclusions

The findings presented in this study give some crucial criterions of appropriate incident angle selections for in vivo polarimetric endoscopy and other applications and can also be valuable references for studying how to minimize the influence further.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 International License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

Citation Download Citation

Zheng Zhang, Conghui Shao, Honghui He, Chao He, Shaoxiong Liu, and Hui Ma "Analyzing the influence of oblique incidence on quantitative backscattering tissue polarimetry: a pilot ex vivo study," Journal of Biomedical Optics 28(10), 102905 (7 August 2023). https://doi.org/10.1117/1.JBO.28.10.102905

Received: 15 April 2023; Accepted: 24 July 2023; Published: 7 August 2023

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