基于CT断层图像的数字重建射线影像快速射线跟踪算法研究  

Research on digitally reconstructed radiograph fast ray tracing algorithm based on CT tomographic image

作　　者：李同英[1,2] 朱洪波[2] LI Tong-ying ZHU Hong-bo(Department of Computer and Information Engineering, Nantong Institute of Technology, Nantong 226002, China Key Lab Nanjing on Wideband Wireless Communications and University of Posts and Telecommunications, Sensor Network Technology, Nanjing 210003, China)

机构地区：[1]南通理工学院计算机与信息工程学院,江苏南通226002 [2]南京邮电大学教育部宽带无线通信与传感网技术重点实验室,江苏南京210003

出　　处：《陕西理工学院学报（自然科学版）》2017年第1期76-81,共6页Journal of Shananxi University of Technology:Natural Science Edition

基　　金：国家高技术研究发展计划项目(863计划)(2014AA01A705);国家973计划课题(2013CB329005)

摘　　要：提出了一种由序列断层图像进行数字重建射线影像的快速射线跟踪算法。采用基于向量的射线跟踪算法,利用计算机体层摄影数据模拟人体组织对辐射线的吸收规律。算法仅有加法及减法运算,计算简便,不需要通过解方程获得相应交点,具有成像时间短、运算速度快等特点。对三维假体存储和检索算法进行了改进,可以实现在线DRR计算,提高了计算速度。最后,对初步得到的DRR影像做进一步数字处理,提高了实用价值。A fast ray tracing algorithm from sequence tomographic images for DRR （Digitally Recon- structed Radiograph）was presented. A ray tracing algorithm based on vector was adopted, and Computed Tomography（CT） data was used to simulate the absorption of radiation from human tissues. The algorithm only has the addition and the subtraction operation, and the computation is simple. The algorithm does not need to obtain the corresponding intersection by solving the equation, and it has the characteristics of short imaging time and fast computing speed. At the same time, this paper improves the algorithm of 3D prosthesis storage and retrieval, and the algorithm realized online DRR calculation, which greatly improves the computing speed. Finally, the DRR images obtained in this paper were further processed digitally to improve their practi- cal value.

关 键 词：数字重建射线影像 CT模拟 射线跟踪 虚拟模拟 虚拟射影成像 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]