1临床资料
患者男,74岁。既往高血压病史25年,脑梗死5年,有反复发作咳嗽咳痰史,1天前突发心前区疼痛,无扩散,持续数小时不缓解,伴大汗,濒死感,据心电图及心肌酶谱明确诊断为急性心肌梗死,经抗凝对症治疗后,于2013年3月15日入本院ICU病...1临床资料
患者男,74岁。既往高血压病史25年,脑梗死5年,有反复发作咳嗽咳痰史,1天前突发心前区疼痛,无扩散,持续数小时不缓解,伴大汗,濒死感,据心电图及心肌酶谱明确诊断为急性心肌梗死,经抗凝对症治疗后,于2013年3月15日入本院ICU病房。体格检查：神清,精神不振,双肺听诊呼吸音粗,可闻及少量湿啰音, WBC 6.3＆#215;109/L,中性粒65%,淋巴29%, T 36.8℃, P 89次/min,心律相对不齐, BP 133/85 mmHg。展开更多
X-ray diffraction enhanced imaging （DEI） has extremely high sensitivity for weakly absorbing low- Z samples in medical and biological fields. In this paper, we propose an Algebra Reconstruction Technique （ART） ite...X-ray diffraction enhanced imaging （DEI） has extremely high sensitivity for weakly absorbing low- Z samples in medical and biological fields. In this paper, we propose an Algebra Reconstruction Technique （ART） iterative reconstruction algorithm for computed tomography of diffraction enhanced imaging （DEI-CT）. An Ordered Subsets （OS） technique is used to accelerate the ART reconstruction. Few-view reconstruction is also studied, and a partial differential equation （PDE） type filter which has the ability of edge-preserving and denoising is used to improve the image quality and eliminate the artifacts. The proposed algorithm is validated with both the numerical simulations and the experiment at the Beijing synchrotron radiation facility （BSRF）.展开更多
Tomosynthesis is a three-dimension reconstruction method that can remove the effect of superim- position with limited angle projections. It is especially promising in mammography where radiation dose is concerned. In ...Tomosynthesis is a three-dimension reconstruction method that can remove the effect of superim- position with limited angle projections. It is especially promising in mammography where radiation dose is concerned. In this paper, we propose a maximum likelihood tomosynthesis reconstruction algorithm （ML-TS） on the apparent absorption data of diffraction enhanced imaging （DEI）. The motivation of this contribution is to develop a tomosynthesis algorithm in low-dose or noisy circumstances and make DEI get closer to clinic application. The theoretical statistical models of DEI data in physics are analyzed and the proposed algorithm is validated with the experimental data at the Beijing Synchrotron Radiation Facility （BSRF）. The results of ML-TS have better contrast compared with the well known ＇shift-and-add＇ algorithm and FBP algorithm.展开更多
Cosmic ray muon radiography which has good penetration ability and is sensitive to high-Z materials, is an effective method to detect shielded nuclear materials. This paper summarizes methods developed to process muon...Cosmic ray muon radiography which has good penetration ability and is sensitive to high-Z materials, is an effective method to detect shielded nuclear materials. This paper summarizes methods developed to process muon radiography in Tsinghua University. The methods include detector data correction, reconstruction algorithms （maximum likelihood scattering, MLS, and the maximum likelihood scattering and displacement, MLSD） acceleration, and the modification of the normalized mean absolute distance measure （NMADM） into a picture comparison binarization method （PCBM） which is more suitable for cosmic ray muon radiographs. Simulations demonstrate that all these methods give excellent results, so that cosmic muon radiography can become more widely used.展开更多
文摘1临床资料
患者男,74岁。既往高血压病史25年,脑梗死5年,有反复发作咳嗽咳痰史,1天前突发心前区疼痛,无扩散,持续数小时不缓解,伴大汗,濒死感,据心电图及心肌酶谱明确诊断为急性心肌梗死,经抗凝对症治疗后,于2013年3月15日入本院ICU病房。体格检查：神清,精神不振,双肺听诊呼吸音粗,可闻及少量湿啰音, WBC 6.3＆#215;109/L,中性粒65%,淋巴29%, T 36.8℃, P 89次/min,心律相对不齐, BP 133/85 mmHg。
基金Supported by National Natural Science Foundation of China (10875066)Program for New Century Excellent Talents in University (NCET-05-0060)
文摘X-ray diffraction enhanced imaging （DEI） has extremely high sensitivity for weakly absorbing low- Z samples in medical and biological fields. In this paper, we propose an Algebra Reconstruction Technique （ART） iterative reconstruction algorithm for computed tomography of diffraction enhanced imaging （DEI-CT）. An Ordered Subsets （OS） technique is used to accelerate the ART reconstruction. Few-view reconstruction is also studied, and a partial differential equation （PDE） type filter which has the ability of edge-preserving and denoising is used to improve the image quality and eliminate the artifacts. The proposed algorithm is validated with both the numerical simulations and the experiment at the Beijing synchrotron radiation facility （BSRF）.
基金Supported by National Natural Science Foundation of China (10875066)Program for New Century Excellent Talents in University (NCET-05-0060)
文摘Tomosynthesis is a three-dimension reconstruction method that can remove the effect of superim- position with limited angle projections. It is especially promising in mammography where radiation dose is concerned. In this paper, we propose a maximum likelihood tomosynthesis reconstruction algorithm （ML-TS） on the apparent absorption data of diffraction enhanced imaging （DEI）. The motivation of this contribution is to develop a tomosynthesis algorithm in low-dose or noisy circumstances and make DEI get closer to clinic application. The theoretical statistical models of DEI data in physics are analyzed and the proposed algorithm is validated with the experimental data at the Beijing Synchrotron Radiation Facility （BSRF）. The results of ML-TS have better contrast compared with the well known ＇shift-and-add＇ algorithm and FBP algorithm.
基金Supported by the National Natural Science Foundation of China(No. 10575059)the Program for New Century Excellent Talents in University (No. NCET-05-0060)the National Natural Science Foundation of China for Young Scholars (No. 10605015)
文摘Cosmic ray muon radiography which has good penetration ability and is sensitive to high-Z materials, is an effective method to detect shielded nuclear materials. This paper summarizes methods developed to process muon radiography in Tsinghua University. The methods include detector data correction, reconstruction algorithms （maximum likelihood scattering, MLS, and the maximum likelihood scattering and displacement, MLSD） acceleration, and the modification of the normalized mean absolute distance measure （NMADM） into a picture comparison binarization method （PCBM） which is more suitable for cosmic ray muon radiographs. Simulations demonstrate that all these methods give excellent results, so that cosmic muon radiography can become more widely used.
