摘要
三维锥束CT图像重建运算量大,纯软件(仅使用CPU)计算时间较长。为了充分利用计算机图形处理器(Graphic Process Unit,GPU)的并行处理能力以及提高数据传输效率,研究了一种结合使用GPU多重纹理(multitexture)加速三维锥束CT的FDK图像重建过程的方法。该方法采用多重纹理映射来提高反投影速度、减少中间数据存储量、减少浮点累加次数,使用顶点颜色通道来实现距离加权运算,采用扩展方法来增加并行反投影的纹理单元,从而提高重建速度。计算机实验结果表明,使用普通PC机重建尺寸为2563的图像,在保证数据精度为16bit浮点数的要求下,GPU反投影计算可以在10s以内完成。与仅使用CPU的重建方法相比,GPU重建图像加速方法达到了较高的时间加速比。
The three-dimension Computed Tomography(CT) reconstruction is time consuming on CPU only.A new accelerated 3D reconstruction method with FDK algorithm using multitexture of GPU (Graphic Process Unit) was developed.Uslng muhitexture hardware,the reconstruction speeds up the baekprojeetion,reduee the temporary memory for saving the result of backprojeetion, and decrease the floating-point sum passes.Using the color channels of vertexes to realize FDK depth weighting computation,and extending the texture units for backprojection,the reconstruction is accelerated.Therefore,the backprojection of a 2563 volume can be completed with 16 bit floating-point textures in less than 10 seconds.The experiment results show that the new GPU accelerated 3D reconstruction method get a fast performance and good quality.
出处
《计算机工程与应用》
CSCD
北大核心
2008年第7期227-230,共4页
Computer Engineering and Applications
基金
国家自然科学基金(the National Natural Science Foundation of China under Grant No.600672098)
关键词
三维锥束CT
FDK算法
加速重建
图形处理器
多重纹理
3D cone CT
FDK algorithm
accelerated reconstruction
GPU(Graphic Process Unit)
multitexture