In-line phase-contrast computed tomography（IL-PC-CT） imaging is a new physical and biochemical imaging method.IL-PC-CT has advantages compared to absorption CT when imaging soft tissues. In practical applications, r...In-line phase-contrast computed tomography（IL-PC-CT） imaging is a new physical and biochemical imaging method.IL-PC-CT has advantages compared to absorption CT when imaging soft tissues. In practical applications, ring artifacts which will reduce the image quality are commonly encountered in IL-PC-CT, and numerous correction methods exist to either pre-process the sinogram or post-process the reconstructed image. In this study, we develop an IL-PC-CT reconstruction method based on anisotropic total variation（TV） minimization. Using this method, the ring artifacts are corrected during the reconstruction process. This method is compared with two methods： a sinogram preprocessing correction technique based on wavelet-FFT filter and a reconstruction method based on isotropic TV. The correction results show that the proposed method can reduce visible ring artifacts while preserving the liver section details for real liver section synchrotron data.展开更多
为实现TV二次回路全面有效的实时监测,避免TV二次回路异常造成保护及安全自动装置的不正确动作,本文通过对TV二次回路异常情况的分析,采用分流法的原理,提出了一种检测TV二次回路的方法,研究开发了TV二次回路在线监测装置。在220 k V平...为实现TV二次回路全面有效的实时监测,避免TV二次回路异常造成保护及安全自动装置的不正确动作,本文通过对TV二次回路异常情况的分析,采用分流法的原理,提出了一种检测TV二次回路的方法,研究开发了TV二次回路在线监测装置。在220 k V平胜站的试运行结果表明,本TV二次回路在线监测装置能够准确无误地反映TV二次回路的运行状态,及时发现TV二次回路异常缺陷。展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.61671004,61271012,81371549,81671683,and 11501415)the Natural Science Foundation of Tianjin City,China(Grant No.16JCYBJC28600)+4 种基金the WBE Liver Fibrosis Foundation of China(Grant No.CFHPC20131033)the Instrument Developing Project of the Chinese Academy of Sciences(Grant No.YZ201410)the Foundation of Tianjin University of Technology and Education(Grant Nos.KJ11-22 and J10011060321)SRF for ROCS,SEMthe IHEP-CAS Scientific Research Foundation(Grant No.2013IHEPYJRC801)
文摘In-line phase-contrast computed tomography（IL-PC-CT） imaging is a new physical and biochemical imaging method.IL-PC-CT has advantages compared to absorption CT when imaging soft tissues. In practical applications, ring artifacts which will reduce the image quality are commonly encountered in IL-PC-CT, and numerous correction methods exist to either pre-process the sinogram or post-process the reconstructed image. In this study, we develop an IL-PC-CT reconstruction method based on anisotropic total variation（TV） minimization. Using this method, the ring artifacts are corrected during the reconstruction process. This method is compared with two methods： a sinogram preprocessing correction technique based on wavelet-FFT filter and a reconstruction method based on isotropic TV. The correction results show that the proposed method can reduce visible ring artifacts while preserving the liver section details for real liver section synchrotron data.
文摘为实现TV二次回路全面有效的实时监测,避免TV二次回路异常造成保护及安全自动装置的不正确动作,本文通过对TV二次回路异常情况的分析,采用分流法的原理,提出了一种检测TV二次回路的方法,研究开发了TV二次回路在线监测装置。在220 k V平胜站的试运行结果表明,本TV二次回路在线监测装置能够准确无误地反映TV二次回路的运行状态,及时发现TV二次回路异常缺陷。
