基于光线投射的锥束CT正投影算法研究  

Cone-beam CT forward projection algorithm based on ray-casting algorithm

作　　者：丁鹏[1] 孙怡[1] 

机构地区：[1]大连理工大学信息与通信工程学院,大连116023

出　　处：《中国体视学与图像分析》2010年第4期387-393,共7页Chinese Journal of Stereology and Image Analysis

摘　　要：计算机断层成像(computed tomography,CT)作为一种现代成像技术已经被广泛应用于医学诊断、工业无损检测等领域。在研究CT重建算法的过程中,正投影模拟数据是必不可少的一部分。本文提出一种基于光线投射算法的圆轨迹锥束扫描模式下的正投影算法,并结合CUDA(compute unified device architecture,统一计算设备架构)技术,实现了GPU(graphics processing unit,图形处理器)加速正投影计算。通过与传统的正投影算法相比,本文算法在投影图像质量上有一定的提高,并具有更高的计算效率。Computed tomography（CT） has been widely used in medical diagnosis and non-destructive testing industrial.The simulation of projection data plays an important role in the research of CT reconstruction algorithm.A CT forward projection algorithm in circular cone-beam scanning mode based on ray-casting algorithm is proposed in this paper,and accelerated by using GPU and CUDA technology.Compared with the results of traditional forward projection algorithm,the proposed algorithm can improve the quality of projection images.Moreover,it has the advantages of higher computational efficiency.

关 键 词：光线投射 CT正投影 GPU CUDA 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]