一般直线-圆弧扫描轨迹CT的三维精确重建  

Exact Cone-beam CT Reconstruction with General Line-circle Trajectories

作　　者：左年明[1] 夏丹[2] 蒋田仔[1] 邹宇[2] 潘晓川[2] 

机构地区：[1]中国科学院自动化研究所模式识别国家重点实验室,中国北京100080 [2]美国芝加哥大学放射系,美国芝加哥60637

出　　处：《电子学报》2007年第7期1382-1386,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60328101)

摘　　要：近年,C-arm CT扫描系统的推出,给实际的扫描轨迹提供了很大的灵活性,比如圆弧-圆弧及直线-圆弧等扫描轨迹,针对于不同的成像及放疗部位,它们将具有很好的应用前景.最近提出的BPF算法不但可以处理投影数据的纵向截断问题,而且也可以处理投影数据的横向截断问题,这使得精确的局部重建成为可能.为了更好的进行局部重建,本文提出了一种一般形式的直线-圆弧扫描轨迹,并且针对这种扫描轨迹,基于上述的BPF算法,提出了一个通用的三维精确重建算法,它可以适用于直线和圆弧所在平面成任意角度的成像系统.这将更进一步的接近真正意义上的局部重建.文章最后的实验结果也证明了我们算法的有效性.In the recent years, the appearance of C-ann CT brought much versatilities to the CT scanning trajectories,such as circle-circle trajectory ,line-circle trajectory and so on,and they would play an special role for a specific region of imaging or radiotherapy. Recently, a novel BPF reconstruction algorithm has been developed, which can handle both the longitudinal truncations and the transversal truncations in projection data, and therefore enable the feasibility of exact local reconstruction. In order to obtain much better local reconstructions, in this work, we proposed a general line-circle trajectory, and furthermore, based on the BPF algorithm, we developed a universal reconstruction algorithm for this kind of trajectory, which can be accommodated to different combinations of the circle and the line in the trajectory. This algorithm can achieve a ROI as small as possible, which will be verified and validated in the experiments in this work.

关 键 词：锥束CT(Computed Tomography) 三维精确重建 C-ARM 直线-圆弧轨迹 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]