<strong>Background and Purpose</strong>: Increasing concern of cerebral venous thrombosis due to treatable and curable causes of stroke. The diagnosis of cerebral venous sinus thrombosis is challenged due ...<strong>Background and Purpose</strong>: Increasing concern of cerebral venous thrombosis due to treatable and curable causes of stroke. The diagnosis of cerebral venous sinus thrombosis is challenged due to nonspecific clinical symptomatology. Patients may present at an emergency room with a variety of neurological conditions such as severe headache, weakness, seizure, etc. Neuroimaging, particularly noncontrast cranial computed tomography (NCCT), is an investigation of choice in differentiation and triage the patients for further treatment. CT is sensitive in the detection of acute thrombosis or blood clots in all regions of the body. We hypothesize that NCCT might be sensitive to diagnose cerebral venous thrombosis immediately. <strong>Materials and Methods:</strong> Retrospectively review the electronic database of our patients, there are 27 patients with cerebral sinus venous thrombosis (SVT) and 4 patients with cerebral deep venous thrombosis (DVT). Other 79 patients present with clinically diagnosed cerebral venous thrombosis but the final result can exclude cerebral venous thrombosis. We use MR imaging and CT venography as the gold standard. Independently reviewed by two neuroradiologists for CT direct sign and CT indirect signs that suggest SVT or DVT. CT direct signs for SVT and DVT are the presence of hyperdensity in the sinus venous or deep venous system (cord sign, attenuated vein sign) and CT indirect signs are the changes in brain parenchyma (brain edema, hemorrhagic infarction). <strong>Results:</strong> Sensitivity and specificity of NCCT in detection attenuated vein sign and diagnosis DVT are 75% and 100% whereas the sensitivity and specificity of NCCT in detection cord sign and diagnosis SVT are 43.8% and 99.7% as respectively. <strong>Conclusions:</strong> NCCT might not sensitive in detection of SVT without CT direct sign which needs further investigation. However, NCCT might beneficial for emergency conditions such as DVT patients, cortical vein thrombosis and also in SVT patients with the positive CT direct sign.展开更多
Objective：The objective was to qualitatively and quantitatively evaluate hepatic metastases using computed tomography （CT） virtual noncontrast （VNC） spectral imaging in a retrospective analysis.Methods：Forty hep...Objective：The objective was to qualitatively and quantitatively evaluate hepatic metastases using computed tomography （CT） virtual noncontrast （VNC） spectral imaging in a retrospective analysis.Methods：Forty hepatic metastases patients underwent CT scans including the conventional true noncontrast （TNC） and the tri-phasic contrast-enhanced dual energy spectral scans in the hepatic arterial,portal venous,and equilibrium phases.The tri-phasic spectral CT images were used to obtain three groups of VNC images including in the arterial （VNCa）,venous （VNCv）,and equilibrium （VNCe） phase by the material decomposition process using water and iodine as a base material pair.The image quality and the contrast-to-noise ratio （CNR） of metastasis of the four groups were compared with ANOVA analysis.The metastasis detection rates with the four nonenhanced image groups were calculated and compared using the Chisquare test.Results：There were no significant differences in image quality among TNC,VNCa and VNCv images （P 〉 0.05）.The quality of VNCe images was significantly worse than that of other three groups （P 〈 0.05）.The mean CNR of metastasis in the TNC and VNCs images was 1.86,2.42,1.92,and 1.94,respectively; the mean CNR of metastasis in VNCa images was significantly higher than that in other three groups （P 〈 0.05）,while no statistically significant difference was observed among VNCv,VNCe and TNC images （P 〉 0.05）.The metastasis detection rate of the four nonenhanced groups with no statistically significant difference （P 〉 0.05）.Conclusions：The quality of VNCa and VNCv images is identical to that of TNC images,and the metastasis detection rate in VNC images is similar to that in TNC images.VNC images obtained from arterial phase show metastases more clearly.Thus,VNCa imaging may be a surrogate to TNC imaging in hepatic metastasis diagnosis.展开更多
目的探讨三维同步非增强血管造影和斑块内出血(threedimensionalsimultaneous noncontrast angiography and intra plaque hemorrhage,3D-SNAP)高分辨磁共振成像技术对颅内动脉夹层的诊断价值。材料与方法连续收集2015年1月至2018年3月...目的探讨三维同步非增强血管造影和斑块内出血(threedimensionalsimultaneous noncontrast angiography and intra plaque hemorrhage,3D-SNAP)高分辨磁共振成像技术对颅内动脉夹层的诊断价值。材料与方法连续收集2015年1月至2018年3月陕西省人民医院神经内科43例后循环短暂性脑缺血发作(transientischemicattack,TIA)或脑梗死患者,其中颅内动脉夹层18例,非动脉夹层25例,所有患者均采用PhilipsIngenia 3.0 T MRI获取TOF-MRA、T1WI-VISTA、T2WI、3D-SNAP、CE-T1WI成像,双盲分析各序列颅内动脉夹层征象。采用卡方检验、独立样本t检验分析夹层组与非夹层组临床基本资料以及夹层组各序列影像学特征;利用受试者工作特征(receiveroperating characteristic,ROC)曲线比较各序列对颅内动脉夹层的诊断效能。结果 (1)夹层组年龄较非夹层组低,差异有统计学意义(P<0.05),两组间性别、血压、糖尿病、吸烟差异均无统计学意义。(2)6例患者在TOF-MRA、T2WI、T1WI-VISTA、SNAP及CE-T1WI成像序列同时显示夹层瘤样扩张、真假腔、壁内血肿、内膜瓣征象;颅内动脉夹层壁内血肿、双腔征及内膜瓣显示率高分辨MRI各序列比较差异有统计学意义(P<0.05),SNAP显示壁内血肿最敏感,CE-T1WI显示双腔征、内膜瓣征最敏感。(3) TOF-MRA、T2WI、T1WI-VISTA、3D-SNAP、CE-T1WI、SNAP联合CE-T1WI成像序列诊断颅内动脉夹层ROC曲线下面积分别为0.663、0.492、0.729、0.741、0.752、0.824。结论 3D-SNAP高分辨磁共振成像技术无创性、有效评价颅内动脉夹层具有无限的潜力和广阔的前景。展开更多
Lymphedema is a major disorder of lymphatic system that occurs primarily due to lymphatic system disorders or secondary lymphedema which is caused by radiation therapy involving lymph nodes or surgical operation disse...Lymphedema is a major disorder of lymphatic system that occurs primarily due to lymphatic system disorders or secondary lymphedema which is caused by radiation therapy involving lymph nodes or surgical operation dissection. Magnetic resonance lymphography (MRL) has been used to effectively examine the lymph vessels and identify their morphology. This review study intended to evaluate the role of non MR-lymphographic for the diagnosis assessment of lymphedema and to provide comprehensive review on clinical outcome of non-contrast MRI compared to MRI with contrast medium. In this study, scientific publications published in languages other than English were excluded. A systematic review was done in international databases including PubMed, Scopus, web of sciences, conference proceedings published till 2019. Non contrast MRI lymphography has strong capability to be the main imaging procedure of choice in the diagnosis lymphedema with accuracy up to 90%.展开更多
文摘<strong>Background and Purpose</strong>: Increasing concern of cerebral venous thrombosis due to treatable and curable causes of stroke. The diagnosis of cerebral venous sinus thrombosis is challenged due to nonspecific clinical symptomatology. Patients may present at an emergency room with a variety of neurological conditions such as severe headache, weakness, seizure, etc. Neuroimaging, particularly noncontrast cranial computed tomography (NCCT), is an investigation of choice in differentiation and triage the patients for further treatment. CT is sensitive in the detection of acute thrombosis or blood clots in all regions of the body. We hypothesize that NCCT might be sensitive to diagnose cerebral venous thrombosis immediately. <strong>Materials and Methods:</strong> Retrospectively review the electronic database of our patients, there are 27 patients with cerebral sinus venous thrombosis (SVT) and 4 patients with cerebral deep venous thrombosis (DVT). Other 79 patients present with clinically diagnosed cerebral venous thrombosis but the final result can exclude cerebral venous thrombosis. We use MR imaging and CT venography as the gold standard. Independently reviewed by two neuroradiologists for CT direct sign and CT indirect signs that suggest SVT or DVT. CT direct signs for SVT and DVT are the presence of hyperdensity in the sinus venous or deep venous system (cord sign, attenuated vein sign) and CT indirect signs are the changes in brain parenchyma (brain edema, hemorrhagic infarction). <strong>Results:</strong> Sensitivity and specificity of NCCT in detection attenuated vein sign and diagnosis DVT are 75% and 100% whereas the sensitivity and specificity of NCCT in detection cord sign and diagnosis SVT are 43.8% and 99.7% as respectively. <strong>Conclusions:</strong> NCCT might not sensitive in detection of SVT without CT direct sign which needs further investigation. However, NCCT might beneficial for emergency conditions such as DVT patients, cortical vein thrombosis and also in SVT patients with the positive CT direct sign.
文摘Objective：The objective was to qualitatively and quantitatively evaluate hepatic metastases using computed tomography （CT） virtual noncontrast （VNC） spectral imaging in a retrospective analysis.Methods：Forty hepatic metastases patients underwent CT scans including the conventional true noncontrast （TNC） and the tri-phasic contrast-enhanced dual energy spectral scans in the hepatic arterial,portal venous,and equilibrium phases.The tri-phasic spectral CT images were used to obtain three groups of VNC images including in the arterial （VNCa）,venous （VNCv）,and equilibrium （VNCe） phase by the material decomposition process using water and iodine as a base material pair.The image quality and the contrast-to-noise ratio （CNR） of metastasis of the four groups were compared with ANOVA analysis.The metastasis detection rates with the four nonenhanced image groups were calculated and compared using the Chisquare test.Results：There were no significant differences in image quality among TNC,VNCa and VNCv images （P 〉 0.05）.The quality of VNCe images was significantly worse than that of other three groups （P 〈 0.05）.The mean CNR of metastasis in the TNC and VNCs images was 1.86,2.42,1.92,and 1.94,respectively; the mean CNR of metastasis in VNCa images was significantly higher than that in other three groups （P 〈 0.05）,while no statistically significant difference was observed among VNCv,VNCe and TNC images （P 〉 0.05）.The metastasis detection rate of the four nonenhanced groups with no statistically significant difference （P 〉 0.05）.Conclusions：The quality of VNCa and VNCv images is identical to that of TNC images,and the metastasis detection rate in VNC images is similar to that in TNC images.VNC images obtained from arterial phase show metastases more clearly.Thus,VNCa imaging may be a surrogate to TNC imaging in hepatic metastasis diagnosis.
文摘目的探讨三维同步非增强血管造影和斑块内出血(threedimensionalsimultaneous noncontrast angiography and intra plaque hemorrhage,3D-SNAP)高分辨磁共振成像技术对颅内动脉夹层的诊断价值。材料与方法连续收集2015年1月至2018年3月陕西省人民医院神经内科43例后循环短暂性脑缺血发作(transientischemicattack,TIA)或脑梗死患者,其中颅内动脉夹层18例,非动脉夹层25例,所有患者均采用PhilipsIngenia 3.0 T MRI获取TOF-MRA、T1WI-VISTA、T2WI、3D-SNAP、CE-T1WI成像,双盲分析各序列颅内动脉夹层征象。采用卡方检验、独立样本t检验分析夹层组与非夹层组临床基本资料以及夹层组各序列影像学特征;利用受试者工作特征(receiveroperating characteristic,ROC)曲线比较各序列对颅内动脉夹层的诊断效能。结果 (1)夹层组年龄较非夹层组低,差异有统计学意义(P<0.05),两组间性别、血压、糖尿病、吸烟差异均无统计学意义。(2)6例患者在TOF-MRA、T2WI、T1WI-VISTA、SNAP及CE-T1WI成像序列同时显示夹层瘤样扩张、真假腔、壁内血肿、内膜瓣征象;颅内动脉夹层壁内血肿、双腔征及内膜瓣显示率高分辨MRI各序列比较差异有统计学意义(P<0.05),SNAP显示壁内血肿最敏感,CE-T1WI显示双腔征、内膜瓣征最敏感。(3) TOF-MRA、T2WI、T1WI-VISTA、3D-SNAP、CE-T1WI、SNAP联合CE-T1WI成像序列诊断颅内动脉夹层ROC曲线下面积分别为0.663、0.492、0.729、0.741、0.752、0.824。结论 3D-SNAP高分辨磁共振成像技术无创性、有效评价颅内动脉夹层具有无限的潜力和广阔的前景。
文摘Lymphedema is a major disorder of lymphatic system that occurs primarily due to lymphatic system disorders or secondary lymphedema which is caused by radiation therapy involving lymph nodes or surgical operation dissection. Magnetic resonance lymphography (MRL) has been used to effectively examine the lymph vessels and identify their morphology. This review study intended to evaluate the role of non MR-lymphographic for the diagnosis assessment of lymphedema and to provide comprehensive review on clinical outcome of non-contrast MRI compared to MRI with contrast medium. In this study, scientific publications published in languages other than English were excluded. A systematic review was done in international databases including PubMed, Scopus, web of sciences, conference proceedings published till 2019. Non contrast MRI lymphography has strong capability to be the main imaging procedure of choice in the diagnosis lymphedema with accuracy up to 90%.
