为解决CT系统中扫描视野受限及低剂量成像问题,提出一种探测器分块排列的CT系统及其稀疏角度CT图像迭代重建方法.探测器分块排列可扩大CT图像物体扫描视野,稀疏角度采集投影数据能有效降低辐射剂量,同时采用ART-TV迭代算法重建CT图像.仿真实验表明:该方法可有效扩大CT系统扫描视野,在稀疏角度获取投影数据采集方式下,利用ART-TV迭代重建算法可重建优质CT图像,实现降低辐射剂量的目的.%To solve the problems of limited FOV and low-dose imaging, a CT system with block arrangement of detector is designed and an iterative reconstruction method for few-view CT is developed. Block arrangement of detector can enlarge FOV while sparse sampling of projection data can decrease radiation dose. Traditional ART-TV algorithm is applied to reconstruct CT image iteratively. Simulation experiments show that, larger CT image FOV is obtained and for sparse data-sampling modality, satisfactory CT images are reconstructed by ART-TV algorithm achieving the goal of low dose imaging.
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