Chen Xueli, Gao Xinbo, Qu Xiaochao, Chen Duofang, Ma Bin, Wang Lin, Peng Kuan, Liang Jimin, Tian Jie
Video and Image Processing System Lab, School of Electronic Engineering, Xidian University, Xi'an, Shaanxi 710071, China.
Int J Biomed Imaging. 2010;2010. doi: 10.1155/2010/650298. Epub 2010 Jun 27.
During the past decade, Monte Carlo method has obtained wide applications in optical imaging to simulate photon transport process inside tissues. However, this method has not been effectively extended to the simulation of free-space photon transport at present. In this paper, a uniform framework for noncontact optical imaging is proposed based on Monte Carlo method, which consists of the simulation of photon transport both in tissues and in free space. Specifically, the simplification theory of lens system is utilized to model the camera lens equipped in the optical imaging system, and Monte Carlo method is employed to describe the energy transformation from the tissue surface to the CCD camera. Also, the focusing effect of camera lens is considered to establish the relationship of corresponding points between tissue surface and CCD camera. Furthermore, a parallel version of the framework is realized, making the simulation much more convenient and effective. The feasibility of the uniform framework and the effectiveness of the parallel version are demonstrated with a cylindrical phantom based on real experimental results.
在过去十年中，蒙特卡罗方法在光学成像领域得到了广泛应用，用于模拟光子在组织内部的传输过程。然而，目前该方法尚未有效地扩展到自由空间光子传输的模拟。本文基于蒙特卡罗方法提出了一种用于非接触光学成像的统一框架，该框架包括组织内和自由空间中光子传输的模拟。具体而言，利用透镜系统的简化理论对光学成像系统中配备的相机镜头进行建模，并采用蒙特卡罗方法描述从组织表面到CCD相机的能量转换。此外，考虑相机镜头的聚焦效果来建立组织表面与CCD相机之间对应点的关系。此外，还实现了该框架的并行版本，使模拟更加便捷有效。基于实际实验结果，通过圆柱形模型验证了统一框架的可行性和并行版本的有效性。
