探测器分块排列的CT系统及其图像重建  

CT System and Image Reconstruction with Block Arrangement of Detector

作　　者：罗宁[1] 袁翠云[1] 齐宏亮[1] 徐圆[1] 周凌宏[1] LUO Ning, YUAN Cui-yun, QI Hong-liang, XU Yuan, ZHOU Ling-hong(Institute of Medical Instrument, School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, Chin)

机构地区：[1]南方医科大学生物医学工程医疗仪器研究所,广州510515

出　　处：《核电子学与探测技术》2017年第8期847-851,共5页Nuclear Electronics & Detection Technology

基　　金：国家科技支撑计划(2015BAI01B10);南方医科大学科研启动计划(LX2016N003)资助

摘　　要：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.

关 键 词：计算机断层扫描 探测器分块 扫描视野 稀疏角度 迭代重建 

分 类 号：TN911.73[电子电信—通信与信息系统]