School of Mechanical Engineering, National Engineering Laboratory for Automotive Electronic Control Technology, Shanghai Jiao Tong University, Shanghai, 200240, China.
Lasers Med Sci. 2021 Feb;36(1):43-54. doi: 10.1007/s10103-020-03001-6. Epub 2020 Apr 10.
The detection and reconstruction of the optical properties within turbid slabs/plate parallel mediums have been widely investigated for its applications in medical diagnosis, atmosphere detection, etc., where the scattering of light would be expected. Although the scattering signal can be utilized for diagnostics purposes, the multiple scattering in the intermediate scattering regime (with an optical depth ~ 2-9) has posed a remarkable challenge. Existing optical tomography methods usually only reconstruct the reduced scattering coefficient to investigate the properties of the scattering target, while reconstruction efforts in analyzing the exact scattering phase function are rare. Solving such issues can provide much more information for proper interpretation of the characteristics of the turbid slab. This work demonstrates an inversion method based on optimization algorithms and the angular distribution of the transmitted light at the entrance plane and the exit plane of the sought medium. Candidate phase functions were pre-calculated and the optimization algorithm is able to reconstruct the phase function spatial distribution of the turbid slab with a satisfactory computational cost. Parametric studies were also performed to analyze the performance of each optimization algorithm used and the sensitivity of this Markov reconstruction scheme to noise.
混浊平板/板状平行介质内光学特性的探测和重建因其在医学诊断、大气探测等领域的应用而得到广泛研究，这些领域都预期会有光的散射。尽管散射信号可用于诊断目的，但在中间散射区域（光学深度约为 2-9）的多次散射带来了显著的挑战。现有的光学层析成像方法通常仅重建降低的散射系数以研究散射目标的性质，而对分析准确散射相位函数的重建工作则很少。解决这些问题可以为混浊平板特性的正确解释提供更多信息。这项工作展示了一种基于优化算法以及在目标介质的入口平面和出口平面上传输光的角度分布的反演方法。候选相位函数已预先计算，优化算法能够以令人满意的计算成本重建混浊平板的相位函数空间分布。还进行了参数研究以分析所使用的每种优化算法的性能以及这种马尔可夫重建方案对噪声的敏感性。
