基于滤波反投影的超短锥束CT扫描算法

分析了现有的一些超短扫描算法,提出一种基于滤波反投影(FBP)方法的超短扫描算法和实现这种算法的圆周分段联合的扫描方式.用该算法对感兴趣区域实施超短扫描所获取的数据可以进行精确的体积重建,并且对噪声不敏感.所提出的圆周分段联合的锥束投影扫描是一种把圆周轨道的半扫描和超短扫描进行合并的组合扫描方式,这种方式有助于提高病灶区域的空间分辨率和密度分辨率,并可降低病人所受X射线照射的剂量.

An FBP-Based Super-Short-Scan Algorithm for Local Cone-Beam Tomography

Analyzing the existing super-short-scan algorithms,a new super-short-scan algorithm is proposed for local cone-beam CT(computed tomography) on FBP(filtered-back projection)basis with a scanning mode provided for the new algorithm to implement the piecewise circumferential combination.It is used to exactly reconstruct a volume of interest by using a data set acquired by super-short scan to make the reconstruction insensitive to noise.The cone-beam projection scan with piecewise circumferential combination proposed is such a scanning mode that the half-scan in circular trajectory is in combination with super-short scan,which is beneficial to improving the spatial resolution and image contrast of focal area and especially reducing the roentgen dose to patients.