基于加权追踪的医学影像体绘制技术  

Medical Image Volume Rendering Technology Based on Weighted Tracking

作　　者：闫强 陈春晓[1] 王亮[1] YAN Qiang;CHEN Chun-xiao;WANG Liang(Department of Biomedical Engineering Nanjing University of Aeronautics and Astronautics,Nanjing,Jiangsu 211106,China)

机构地区：[1]南京航空航天大学生物医学工程系,江苏南京211106

出　　处：《计算机仿真》2022年第4期166-169,402,共5页Computer Simulation

摘　　要：目前,医学影像体绘制主要采用光线投射算法。随着计算机硬件技术的快速发展以及医学体数据集的大量增加,对医学影像体绘制技术提出了更高的要求。基于物理特性光传输理论的蒙特卡罗光线追踪方法可以模拟光在介质中的真实传播路径,生成的图像能反映阴影、景深等信息,视觉效果更加逼真。通过设计加权追踪系数,引入细化包围盒算法对加权追踪进行优化,实现了基于加权追踪的多重散射光线追踪体绘制。实验结果表明,多重散射能够生成比单次散射更加平滑、细致逼真的图像,加权追踪的计算速度相比经典的Woodcock追踪算法加快了12.06%。Currently, medical volume rendering mainly uses ray casting algorithm. With the rapid development of computer hardware and the massive increase of medical volume data sets, higher requirements are put forward for medical volume rendering. The Monte Carlo ray tracing method based on the light transmission theory can simulate the true propagation path of light in the medium. The image generated by this method can reflect shadow, depth and other information, and the visual effect is more realistic. In this paper, we designed the weighted tracking coefficients, and introduced a refined bounding box algorithm to optimize the weighted tracking, and realized the multi-scattered ray tracing volume rendering based on the weighted tracking. Experimental results show that multiple scattering can generate smoother, more detailed and realistic images than single scattering, and the calculation speed of weighted tracking is 12. 06% faster than the Woodcock tracking algorithm.

关 键 词：体绘制 加权追踪 蒙特卡罗光线追踪 细化包围盒 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]