Objective To evaluate the visualization of the anterior spinal artery (ASA) and the artery of Adamkiewicz (AKA) as well as the affecting factors for the detection rate using multidetector row CT (MDCT). Methods Ninety...Objective To evaluate the visualization of the anterior spinal artery (ASA) and the artery of Adamkiewicz (AKA) as well as the affecting factors for the detection rate using multidetector row CT (MDCT). Methods Ninety-nine consecutive patients (31 women and 68 men; age range, 25-90 years; average age 61.3 years) with suspicion for thoracic aortic lesions necessitating surgical intervention (31 aortic aneurysm, 45 dissection, 5 intramural hematoma, and 18 normal), underwent 16-slice MDCT angiography from the aortic arch to the aortic bifurcation. Transverse sections, multiplanar reformations (MPR) and thin maximum intensity projections (MIP) were used to assess the ASA and AKA. The level of the ASA and AKA origins and CT acquisition parameters were recorded. The contrast-to-noise ratio (CNR) of the image, an index of the mass of the T11 body (vertebral mass index), the subcutaneous fat thickness,and the CT value within the aortic arch and at the T11 level were measured. The detection of the ASA and AKA was evaluated relative to the acquisition parameters, scan characteristics, and aortic lesion type. Differences were assessed with Wilcoxon rank-sum and t tests. Results The ASA was visualized in 51 patients (52%) and the AKA in 18 patients (18 %). The ASA was identified in 36/67 (54%)patients with 1.25 mm thickness and in15/32 (47%) patients with 2.5-3.0 mm thickness. This difference did not achieve significance (P=0.13). The detection rate of the ASA and the AKA was influenced by vertebral mass index and the CNR (P＜0.05). The amount of subcutaneous fat affected the detection rate of the ASA (P＜0.05) but not the AKA. In CT scans with ASA detection, the mean CT values in the aorta at the arch and at T11 were 360 and 358 HU, respectively; whereas in CT scans without ASA detection, the CT values in the aorta at the arch and at T11 were lower (297 and 317 HU, respectively; both P＜0.05). Conclusion The ASA and AKA were less frequently detected in our cohorts than previous reports. The visualization of the ASA and AKA was significantly affected by aortic enhancement, the 'vertebral mass index', and the CNR.展开更多
Objective: To identify the morphological parameters that are related to intracranial aneurysms(IAs) rupture using a case-control model.Methods: A total of 107 patients with multiple IAs and aneurysmal subarachnoid hem...Objective: To identify the morphological parameters that are related to intracranial aneurysms(IAs) rupture using a case-control model.Methods: A total of 107 patients with multiple IAs and aneurysmal subarachnoid hemorrhage between August 2011 and February 2017 were enrolled in this study.Characteristics of IAs location, shape, neck width, perpendicular height, depth, maximum size, flow angle, parent vessel diameter(PVD), aspect ratio(AR) and size ratio(SR) were evaluated using CT angiography.Multiple logistic regression analysis was used to identify the independent risk factors associated with IAs rupture.Receiver operating characteristic curve analysis was performed on the final model, and the optimal thresholds were obtained.Results: IAs located in the internal carotid artery(ICA) was associated with a negative risk of rupture, whereas AR, SR1(height/PVD) and SR2(depth/PVD) were associated with increased risk of rupture.When SR was calculated differently, the odds ratio values of these factors were also different.The receiver operating characteristic curve showed that AR, SR1 and SR2 had cut-off values of 1.01, 1.48 and 1.40, respectively.SR3(maximum size/PVD) was not associated with IAs rupture.Conclusions: IAs located in the ICA are associated with a negative risk of rupture, while high AR(>1.01), SR1(>1.48) or SR2(>1.40) are risk factors for multiple IAs rupture.展开更多
Basilar artery fenestration is a rare anatomical variation resulting from the failed fusion of the two vertebral arteries during embryonic life. In order of frequency, it is the second most common location of vascular...Basilar artery fenestration is a rare anatomical variation resulting from the failed fusion of the two vertebral arteries during embryonic life. In order of frequency, it is the second most common location of vascular fenestrations after the anterior communicating artery. Vertebrobasilar junction aneurysms are uncommon but often associated with basilar artery fenestration. We report the case of a fenestrated vertebrobasilar junction saccular aneurysm in a 57-year-old woman. The diagnosis was incidentally made on CT angiography which found the anatomical variant and the aneurysm. The radiological features illustrating this association are detailed here and a brief discussion of its pathogenesis and management was made. Vertebrobasilar junction aneurysms are rare and their presence should suggest an associated basilar fenestration.展开更多
目的探讨320排CT螺旋扫描模式下应用单能量去金属伪影技术(single energy metal artifact reduction,SEMAR)在复杂腹主动脉瘤腔内修复术(endovascular aortic repair,EVAR)联合弹簧圈瘤体栓塞术后CTA复查中的应用价值。方法回顾性分析2...目的探讨320排CT螺旋扫描模式下应用单能量去金属伪影技术(single energy metal artifact reduction,SEMAR)在复杂腹主动脉瘤腔内修复术(endovascular aortic repair,EVAR)联合弹簧圈瘤体栓塞术后CTA复查中的应用价值。方法回顾性分析2023年8月至2024年2月在复旦大学附属中山医院行EVAR联合弹簧圈瘤体栓塞术后30 d行腹部CTA复查的14例腹主动脉瘤患者和2例髂内动脉瘤患者的CTA图像。对原始数据分别用混合迭代重建算法(non-SEMAR组)和联合SEMAR算法(SEMAR组)进行重建,对比两组图像伪影指数(artifact index,AI)、伪影周围对比噪声比(contrast-to-noise ratio,CNR)和主观评分。结果SEMAR组弹簧圈上、下、左、右和邻近主动脉腔内的AI值均低于non-SEMAR组(38.16±19.20 vs 89.29±30.93、30.75±16.28 vs 82.62±28.01、33.61±16.18 vs 74.90±26.28、44.99±15.91 vs 87.72±33.70和24.49±12.58 vs 47.29±13.55,P<0.001);SEMAR组各方位CNR高于non-SEMAR组(2.47±2.15 vs 1.01±0.74、2.32±2.01 vs 0.72±0.50、4.93±4.15 vs 1.38±0.79、4.10±4.14 vs 1.56±1.18和19.91±11.01 vs 11.01±7.77,P<0.05)。与non-SEMAR组相比,SEMAR组图像主观评分明显增加(P<0.001)。结论SEMAR技术可减少弹簧圈伪影,提高瘤体、内脏动脉、支架和内漏显示的清晰度,对EVAR术后随访有重要临床意义。展开更多
文摘Objective To evaluate the visualization of the anterior spinal artery (ASA) and the artery of Adamkiewicz (AKA) as well as the affecting factors for the detection rate using multidetector row CT (MDCT). Methods Ninety-nine consecutive patients (31 women and 68 men; age range, 25-90 years; average age 61.3 years) with suspicion for thoracic aortic lesions necessitating surgical intervention (31 aortic aneurysm, 45 dissection, 5 intramural hematoma, and 18 normal), underwent 16-slice MDCT angiography from the aortic arch to the aortic bifurcation. Transverse sections, multiplanar reformations (MPR) and thin maximum intensity projections (MIP) were used to assess the ASA and AKA. The level of the ASA and AKA origins and CT acquisition parameters were recorded. The contrast-to-noise ratio (CNR) of the image, an index of the mass of the T11 body (vertebral mass index), the subcutaneous fat thickness,and the CT value within the aortic arch and at the T11 level were measured. The detection of the ASA and AKA was evaluated relative to the acquisition parameters, scan characteristics, and aortic lesion type. Differences were assessed with Wilcoxon rank-sum and t tests. Results The ASA was visualized in 51 patients (52%) and the AKA in 18 patients (18 %). The ASA was identified in 36/67 (54%)patients with 1.25 mm thickness and in15/32 (47%) patients with 2.5-3.0 mm thickness. This difference did not achieve significance (P=0.13). The detection rate of the ASA and the AKA was influenced by vertebral mass index and the CNR (P＜0.05). The amount of subcutaneous fat affected the detection rate of the ASA (P＜0.05) but not the AKA. In CT scans with ASA detection, the mean CT values in the aorta at the arch and at T11 were 360 and 358 HU, respectively; whereas in CT scans without ASA detection, the CT values in the aorta at the arch and at T11 were lower (297 and 317 HU, respectively; both P＜0.05). Conclusion The ASA and AKA were less frequently detected in our cohorts than previous reports. The visualization of the ASA and AKA was significantly affected by aortic enhancement, the 'vertebral mass index', and the CNR.
基金supported by Research Project of Third Military Medical University(2016YLC22)
文摘Objective: To identify the morphological parameters that are related to intracranial aneurysms(IAs) rupture using a case-control model.Methods: A total of 107 patients with multiple IAs and aneurysmal subarachnoid hemorrhage between August 2011 and February 2017 were enrolled in this study.Characteristics of IAs location, shape, neck width, perpendicular height, depth, maximum size, flow angle, parent vessel diameter(PVD), aspect ratio(AR) and size ratio(SR) were evaluated using CT angiography.Multiple logistic regression analysis was used to identify the independent risk factors associated with IAs rupture.Receiver operating characteristic curve analysis was performed on the final model, and the optimal thresholds were obtained.Results: IAs located in the internal carotid artery(ICA) was associated with a negative risk of rupture, whereas AR, SR1(height/PVD) and SR2(depth/PVD) were associated with increased risk of rupture.When SR was calculated differently, the odds ratio values of these factors were also different.The receiver operating characteristic curve showed that AR, SR1 and SR2 had cut-off values of 1.01, 1.48 and 1.40, respectively.SR3(maximum size/PVD) was not associated with IAs rupture.Conclusions: IAs located in the ICA are associated with a negative risk of rupture, while high AR(>1.01), SR1(>1.48) or SR2(>1.40) are risk factors for multiple IAs rupture.
文摘Basilar artery fenestration is a rare anatomical variation resulting from the failed fusion of the two vertebral arteries during embryonic life. In order of frequency, it is the second most common location of vascular fenestrations after the anterior communicating artery. Vertebrobasilar junction aneurysms are uncommon but often associated with basilar artery fenestration. We report the case of a fenestrated vertebrobasilar junction saccular aneurysm in a 57-year-old woman. The diagnosis was incidentally made on CT angiography which found the anatomical variant and the aneurysm. The radiological features illustrating this association are detailed here and a brief discussion of its pathogenesis and management was made. Vertebrobasilar junction aneurysms are rare and their presence should suggest an associated basilar fenestration.
文摘目的探讨320排CT螺旋扫描模式下应用单能量去金属伪影技术(single energy metal artifact reduction,SEMAR)在复杂腹主动脉瘤腔内修复术(endovascular aortic repair,EVAR)联合弹簧圈瘤体栓塞术后CTA复查中的应用价值。方法回顾性分析2023年8月至2024年2月在复旦大学附属中山医院行EVAR联合弹簧圈瘤体栓塞术后30 d行腹部CTA复查的14例腹主动脉瘤患者和2例髂内动脉瘤患者的CTA图像。对原始数据分别用混合迭代重建算法(non-SEMAR组)和联合SEMAR算法(SEMAR组)进行重建,对比两组图像伪影指数(artifact index,AI)、伪影周围对比噪声比(contrast-to-noise ratio,CNR)和主观评分。结果SEMAR组弹簧圈上、下、左、右和邻近主动脉腔内的AI值均低于non-SEMAR组(38.16±19.20 vs 89.29±30.93、30.75±16.28 vs 82.62±28.01、33.61±16.18 vs 74.90±26.28、44.99±15.91 vs 87.72±33.70和24.49±12.58 vs 47.29±13.55,P<0.001);SEMAR组各方位CNR高于non-SEMAR组(2.47±2.15 vs 1.01±0.74、2.32±2.01 vs 0.72±0.50、4.93±4.15 vs 1.38±0.79、4.10±4.14 vs 1.56±1.18和19.91±11.01 vs 11.01±7.77,P<0.05)。与non-SEMAR组相比,SEMAR组图像主观评分明显增加(P<0.001)。结论SEMAR技术可减少弹簧圈伪影,提高瘤体、内脏动脉、支架和内漏显示的清晰度,对EVAR术后随访有重要临床意义。
