代数重建技术中加权研究及其快速实现  

Weighting research and fast realization for algebraic reconstruction technique

作　　者：王宏钧[1] 路宏年[1] 

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100083

出　　处：《计算机工程与设计》2006年第15期2718-2719,2727,共3页Computer Engineering and Design

基　　金：国家自然科学基金项目(60172014)。

摘　　要：在用代数重建技术(ART)进行图像重建时,其重建精度及速度始终是研究的两个重要方面。为提高重建精度,利用加权函数对方程组系数进行加权处理。对于用加权函数对方程组进行加权时大大增加的计算量,针对锥束情况提出用离散线性插值法求取权值,其在保证精度的前提下,提高了迭代重建速度。通过对一板壳构件断层重建计算机模拟结果表明,此加权处理后图像质量明显改善,同时利用离散线性插值法可将重建速度提高近30倍。When reconstructing images with algebraic reconstruction technique （ART）, the accuracy and speed are two important aspects for researching. To enhance reconstruction accuracy, weighting functions to weight the coefficient of equations is used. As the computational expense increases greatly when the equations are weighted by weighting functions, discrete linear interpolation method to get the weight for cone-beam is put forward. The method can increase reconstruction speed, and ensure reconstruction accuracy at the same time. Computer simulation result for shell-like object shows that image quality is improved obviously after weighting, and the speed is improved about 30 times with the discrete linear interpolation method.

关 键 词：加权研究 贝塞尔-凯塞函数 代数重建技术 快速重建 板壳结构 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]