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

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.