A NOVEL EMPIRICAL POST-PROCESSING CUPPING CALIBRATION FOR CONE-BEAM COMPUTED TOMOGRAPHY

摘要：

This paper proposes a novel empirical postprocessing cupping calibration (NEPCC) for CT cupping artifacts which are caused by nonlinearities in the projection data. This method is only based on the initial reconstructed images with cupping artifacts and requires neither the a-priori knowledge of the spectrum nor the coefficients of the attenuation. It aims at finding a proper corrector for the region with cupping artifacts by linearizing the basis images in a polynomial form. The basis images are obtained by integrating 180° forward projected data of the initial reconstruction for every pixel in the region of interest (ROI). The coefficients of the polynomial are determined by using a template image, which is obtained directly from the uncorrected phantom image without any assumptions of the phantoms size or position, which is also required for fitting the product of the corrector and the initial reconstruction to it in image domain. This approach proved to be effective in performing water pre-correction for a conebeam computed tomography (CBCT).

关键词： cone-beam CT post-processing cupping artifacts

作者: Beibei Qian Lisheng Xu DayuXiao Max Q.-H Meng Yan Kang

作者单位: Sino-Dutch Biomedical and Information Engineering School,Northeastern University Shenyang City,Liaon Sino-Dutch Biomedical and Information Engineering School,Northeastern University Shenyang City,Liaon Sino-Dutch Biomedical and Information Engineering School,Northeastern University Shenyang City,Liaon

会议类型: 国际会议

会议名称: The Thirteenth China-Japan-Korea Joint Symposium on Medical Informatics(第十三届中日韩医药信息学会议CJKMI 2011)

会议地点: 深圳

会议语种:英文

页码: 39-43

在线出版日期: 2011-10-31（万方平台首次上网日期，不代表论文的发表时间）