研究二维广义轨迹锥形束 CT 中的 BPF 算法。

Investigation of BPF algorithm in cone-beam CT with 2D general trajectories.

机构信息

Lauterbur Center for Biomedical Imaging Research, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Guangdong, China.

出版信息

J Xray Sci Technol. 2012;20(3):351-62. doi: 10.3233/XST-2012-0343.

DOI:10.3233/XST-2012-0343

PMID:22948356

Abstract

A mathematical derivation was conducted to illustrate that exact 3D image reconstruction could be achieved for z-homogeneous phantoms from data acquired with 2D general trajectories using the back projection filtration (BPF) algorithm. The conclusion was verified by computer simulation and experimental result with a circular scanning trajectory. Furthermore, the effect of the non-uniform degree along z-axis of the phantoms on the accuracy of the 3D reconstruction by BPF algorithm was investigated by numerical simulation with a gradual-phantom and a disk-phantom. The preliminary result showed that the performance of BPF algorithm improved with the z-axis homogeneity of the scanned object.

摘要

进行了数学推导，以说明使用反向投影滤波（BPF）算法从二维一般轨迹获取的数据可以实现 z 均匀体模的精确三维图像重建。该结论通过圆形扫描轨迹的计算机模拟和实验结果得到了验证。此外，通过数值模拟渐变体模和圆盘体模，研究了体模沿 z 轴的不均匀程度对 BPF 算法三维重建精度的影响。初步结果表明，BPF 算法的性能随扫描物体 z 轴均匀性的提高而提高。