光学学报, 2019, 39 (4): 0412011, 网络出版: 2019-05-10
基于时域光信息的近红外光学成像 下载: 953次
Near-Infrared Optical Imaging Based on Time-Domain Photon Information
图像处理 图像重建技术 时域辐射传输 序列二次规划 步长加速法 image processing image reconstruction technique time-domain radiative transfer sequential quadratic programming step acceleration method
摘要
利用时域辐射传输方程,模拟了脉冲激光在弥散介质内的传输。利用广义Guess-Markov随机场模型,构建了正则化项,克服了反问题的病态特性。将步长加速法与序列二次规划算法相结合来求解反问题,构建了一种不依赖初值的光学成像算法,重建了二维弥散介质内的吸收系数和散射系数的分布,并模拟了癌变生物组织的近红外光学成像。研究结果表明,所提算法能够较好地解决初值依赖性问题且具备高精度,重建得到的图像能够清晰地分辨出介质内部的结构。
Abstract
The time-domain radiative transfer equation is used to simulate the propagation of pulsed laser in dispersive medium. The generalized Guess-Markov random field model is adopted to establish a regularization term and thus the ill-posed property of an inverse problem is overcome. The inverse problem is solved by the step acceleration method combined with the sequential quadratic programming algorithm. An optical imaging algorithm which does not rely on the initial values is proposed to reconstruct the distributions of absorption and scattering coefficients in the two-dimensional dispersive medium. The near-infrared optical imaging of the cancerous biological tissues is simulated. The research results show that the proposed algorithm can not only relatively well solve the initial value dependent problem, but also possesses high accuracy. The reconstructed images can show the inner structures of medium clearly.
乔要宾, 陈辛, 郭正玉. 基于时域光信息的近红外光学成像[J]. 光学学报, 2019, 39(4): 0412011. Yaobin Qiao, Xin Chen, Zhengyu Guo. Near-Infrared Optical Imaging Based on Time-Domain Photon Information[J]. Acta Optica Sinica, 2019, 39(4): 0412011.