Aims: The aim of this study is to have a pictorial review on the role of 64-slice multi-detector computerized tomography (MDCT) in detecting post coronary artery graft (GABG) cardiothoracic complications. Materials &a...Aims: The aim of this study is to have a pictorial review on the role of 64-slice multi-detector computerized tomography (MDCT) in detecting post coronary artery graft (GABG) cardiothoracic complications. Materials & Methods: During the period from November 2012 to December 2013, a prospective evaluation of 40 patients with suspected post-operative cardiothoracic complications underwent MDCT coronary angiography in our clinical radiology department. Informed consent was obtained from all patients and the study had institutional review board approval. Descriptive statistics were used to analyze the data. Results: There were 35 males and 5 females, their mean age ± (SD) of 57 ± 3.9 years. A total of 60 grafts were available for evaluation. Two patients could not be evaluated due to clip-artifacts and advanced atherosclerotic disease. Eleven patients showed occluded graft (9) at proximal and distal (2) anastomosis. Seven patients showed pericardial effusion and pleural effusion (8). Two patients had chest wall infection with retrosternal extension and associated mediastinal involvement. One patient showed aneurysm at the re-implanted coronary artery after Bentall procedure, another patient had postoperative myocardial infarction, one patient showed dissection of the ascending aorta, one patient pseudoaneurysm of left ventricle, two patients localized pericardial hematoma, two patients pulmonary embolism, and two patients showed pneumonia. All these complications occurred from 1-60 days from surgery. Conclusion: HD MDCT is an easy non-invasive technique which showed to be effective in diagnosis of most postoperative CABG cardiothoracic complications and is gaining more ground in difficult clinical situations.展开更多
Rationale and Objectives: Cystic lung disease may be accurately diagnosed by imaging interpretation of specialist radiologists, without other information. We hypothesized that with minimal training non-specialists cou...Rationale and Objectives: Cystic lung disease may be accurately diagnosed by imaging interpretation of specialist radiologists, without other information. We hypothesized that with minimal training non-specialists could perform similarly to specialist physicians in the diagnosis of cystic lung disease. Methods: 72 cystic lung disease cases and 25 cystic lung disease mimics were obtained from three sources: 1) a prospective acquired diffuse lung disease registry, 2) a retrospective search of medical records and 3) teaching files. Cases were anonymized, randomized and interpreted by 7 diffuse lung disease specialists and 15 non-specialist radiologists and pulmonologists. Clinical information other than age and sex was not provided. Prior to interpretation, non-specialists viewed a short PDF training document explaining cystic lung disease interpretation. Results: Correct first choice diagnosis of 85%-88% may be achieved by high-performing specialist readers and 71%-80% by non-specialists and lower-performing specialists, with mean accuracies in the diagnosis of LAM (91%, p Conclusion: With specific but limited training, non-specialist physicians can diagnose cystic lung diseases from CT appearance alone with similar accuracy to specialists, correctly identifying approximately 75% of cases.展开更多
Charge transport characteristics of Cd_（0.95）Mn_（0.05）Te：In radiation detectors have been evaluated by combining time resolved current transient measurements with time of flight charge transient measurements.The ...Charge transport characteristics of Cd_（0.95）Mn_（0.05）Te：In radiation detectors have been evaluated by combining time resolved current transient measurements with time of flight charge transient measurements.The shapes of the measured current pulses have been interpreted with respect to a concentration of net positive space-charge, which has resulted in an electric field gradient across the detector bulk.From the recorded current pulses the charge collection efficiency of the detector was found to approach 100%.From the evolution of the charge collection efficiency with applied bias,the electron mobility-lifetime product ofμ_nτ_n =（8.5±0.4）×10^（-4） cm^2/V has been estimated.The electron transit time was determined using both transient current technique and time of flight measurements in the bias range of 100-1900 V.From the dependence of drift velocity on applied electric field the electron mobility was found to beμ_n =（718±55） cm^2/（V·s） at room temperature.展开更多
文摘Aims: The aim of this study is to have a pictorial review on the role of 64-slice multi-detector computerized tomography (MDCT) in detecting post coronary artery graft (GABG) cardiothoracic complications. Materials & Methods: During the period from November 2012 to December 2013, a prospective evaluation of 40 patients with suspected post-operative cardiothoracic complications underwent MDCT coronary angiography in our clinical radiology department. Informed consent was obtained from all patients and the study had institutional review board approval. Descriptive statistics were used to analyze the data. Results: There were 35 males and 5 females, their mean age ± (SD) of 57 ± 3.9 years. A total of 60 grafts were available for evaluation. Two patients could not be evaluated due to clip-artifacts and advanced atherosclerotic disease. Eleven patients showed occluded graft (9) at proximal and distal (2) anastomosis. Seven patients showed pericardial effusion and pleural effusion (8). Two patients had chest wall infection with retrosternal extension and associated mediastinal involvement. One patient showed aneurysm at the re-implanted coronary artery after Bentall procedure, another patient had postoperative myocardial infarction, one patient showed dissection of the ascending aorta, one patient pseudoaneurysm of left ventricle, two patients localized pericardial hematoma, two patients pulmonary embolism, and two patients showed pneumonia. All these complications occurred from 1-60 days from surgery. Conclusion: HD MDCT is an easy non-invasive technique which showed to be effective in diagnosis of most postoperative CABG cardiothoracic complications and is gaining more ground in difficult clinical situations.
文摘Rationale and Objectives: Cystic lung disease may be accurately diagnosed by imaging interpretation of specialist radiologists, without other information. We hypothesized that with minimal training non-specialists could perform similarly to specialist physicians in the diagnosis of cystic lung disease. Methods: 72 cystic lung disease cases and 25 cystic lung disease mimics were obtained from three sources: 1) a prospective acquired diffuse lung disease registry, 2) a retrospective search of medical records and 3) teaching files. Cases were anonymized, randomized and interpreted by 7 diffuse lung disease specialists and 15 non-specialist radiologists and pulmonologists. Clinical information other than age and sex was not provided. Prior to interpretation, non-specialists viewed a short PDF training document explaining cystic lung disease interpretation. Results: Correct first choice diagnosis of 85%-88% may be achieved by high-performing specialist readers and 71%-80% by non-specialists and lower-performing specialists, with mean accuracies in the diagnosis of LAM (91%, p Conclusion: With specific but limited training, non-specialist physicians can diagnose cystic lung diseases from CT appearance alone with similar accuracy to specialists, correctly identifying approximately 75% of cases.
基金supported in part by the Cooperative Research Centre for Biomedical Imaging Development
文摘Charge transport characteristics of Cd_（0.95）Mn_（0.05）Te：In radiation detectors have been evaluated by combining time resolved current transient measurements with time of flight charge transient measurements.The shapes of the measured current pulses have been interpreted with respect to a concentration of net positive space-charge, which has resulted in an electric field gradient across the detector bulk.From the recorded current pulses the charge collection efficiency of the detector was found to approach 100%.From the evolution of the charge collection efficiency with applied bias,the electron mobility-lifetime product ofμ_nτ_n =（8.5±0.4）×10^（-4） cm^2/V has been estimated.The electron transit time was determined using both transient current technique and time of flight measurements in the bias range of 100-1900 V.From the dependence of drift velocity on applied electric field the electron mobility was found to beμ_n =（718±55） cm^2/（V·s） at room temperature.
