物理学报Issue(21)：101-107,7.DOI:10.7498/aps.62.210702
锥束CT平板探测器成像的余晖建模与校正方法
Image lag modeling and correction method for flat panel detector in cone-beam CT
摘要
Abstract
Cone-beam computed tomography (CT) has the notable features, viz high efficiency and high precision, and is widely used in the areas such as medical imaging and industrial non-destructive testing, but the presence of image lag reduces the quality of CT images. By referencing the multi-exponential decay model for the image lag and combining with the actual decay rule of the flat panel detector output signal, a new decay modeling and correction method for the image lag based on multi-exponential fitting is proposed. Firstly, an imaging experiment using cone-beam CT based on flat panel detector is carried out;the results show that the image lag decay of the pixels in the flat panel detector has a good consistency, and is irrelevant to the initial gray value. Then, the rapid image lag correction is achieved according to the image lag decay model, and the comparison of image quality of the projected images and slice images before and after image lag correction indicates that the edge sharpness of the part has been significantly improved after the lag correction. This method does not need to obtain the scintillation compositions and the decay time constants of the detector, and is easily applied to the practical cone-beam CT imaging systems for image lag detection and correction.关键词
余晖/平板探测器/锥束CT/多指数衰减Key words
image lag/flat panel detector/cone-beam CT/multi-exponential decay引用本文复制引用
黄魁东,张定华,李明君,张华..锥束CT平板探测器成像的余晖建模与校正方法[J].物理学报,2013,(21):101-107,7.基金项目
国家科技重大专项(批准号:2012ZX04007021)、国家自然科学基金青年科学基金(批准号:51105315)、陕西省自然科学基础研究计划(批准号:2013JM7003)和西北工业大学基础研究基金(批准号:JC20110253, JC20120226)资助的课题.@@@@Project supported by the National Science and Technology Major Project of the Ministry of Industry and Information Technology of China (Grant No.2012ZX04007021), the Young Scientists Fund of the National Natural Science Foundation of China (Grant No.51105315), the Natural Science Basic Research Program of Shaanxi Province, China (Grant No.2013JM7003), and the Northwestern Polytechnical University Foundation for Fundamental Research, China (Grant Nos. JC20110253, JC20120226) （批准号:2012ZX04007021）
