硬件加速的数字化放射图像重建算法  

A Hardware Accelerated Digital Reconstruction Radiograph Rendering Algorithm

作　　者：陈为[1] 

机构地区：[1]浙江大学CAD&CG国家重点实验室,杭州310027

出　　处：《计算机辅助设计与图形学学报》2005年第4期683-688,共6页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家自然科学基金(60103017;60303028);国家重点基础研究发展规划项目(2002CB312100);浙江省人才基金青年项目(R603046)

摘　　要：数字化放射图像重建技术被广泛应用于癌症放射治疗中,包括诊断、术前规划及术内辅助提出一种两步法硬件加速数字化放射图像重建算法第一步将光线投射的三个步骤,即几何变换、场景遍历和渲染,完全在可编程图形硬件中实现,从而快速模拟了X 光线的衰减过程;第二步利用浮点精度纹理和render to texture功能,快速模拟出高质量的X 光线的负片曝光效果实验结果表明,该算法能高质量地交互重建数字化放射图像。Digital reconstructed radiograph (DRR) is an important technique widely used in radiotherapy including diagnosis, pre-operative planning and intra-operative assistance. In this paper, we present a novel two-step hardware accelerated DRR algorithm. First, three stages involved in direct volume rendering algorithm, namely, geometric transformation, traversing and illumination, are fully accomplished in graphics accelerator, yielding an X-ray attenuation image. Subsequently, the resultant image is used for simulating X-ray exposure process by exploring the newest features such as render-to-texture technique. Preliminary experimental results show that our algorithm can achieve high-quality DRR images at an interactive rendering speed and thus is suitable for radiotherapy diagnosing and treatment applications.

关 键 词：数字化放射图像 X-光线 图形硬件加速 光线投射 

分 类 号：TP391.7[自动化与计算机技术—计算机应用技术]