Nakanishi T, Fukuoka H, Azuma K, Ito K
Department of Radiology, Hiroshima University, School of Medicine, Japan.
Radiat Med. 1997 May-Jun;15(3):155-61.
To assess the diagnostic value of CT angiography of thoracic aortic aneurysm and dissection with electron-beam CT.
Electron-beam CT angiography was used for the evaluation of thoracic aortic aneurysm (n = 15), and aortic dissection (n = 15). Continuous volume scan (CVS), permitted by continuous X-ray exposure with table incrementation, was performed in all patients. An additional electrocardiographically triggered scan was obtained in four patients. Three-dimensional surface display and multiplanar reformations were obtained and compared with digital subtraction angiography.
Motion artifacts and the resulting degradation of three-dimensional image quality were frequent in the ascending aorta of CVS images. Electrocardiographically triggered sections improved the image quality of the ascending aorta. In the aortic arch and descending aorta, excellent three-dimensional images competitive in quality with digital subtraction angiography were obtained in all patients. For patients with aortic dissection, multiplanar reformation was useful to demonstrate the intimal flap and entry sites.
The use of electron-beam CT angiography is feasible for the diagnosis of thoracic aortic aneurysm and dissection.
评估电子束CT对胸主动脉瘤和主动脉夹层的诊断价值。
采用电子束CT血管造影术评估胸主动脉瘤（n = 15）和主动脉夹层（n = 15）。所有患者均进行连续容积扫描（CVS），通过连续X线曝光及床移动实现。4例患者还进行了心电图触发扫描。获取三维表面显示和多平面重组图像，并与数字减影血管造影进行比较。
CVS图像升主动脉中运动伪影及由此导致的三维图像质量下降较为常见。心电图触发扫描改善了升主动脉的图像质量。在主动脉弓和降主动脉，所有患者均获得了质量可与数字减影血管造影媲美的优质三维图像。对于主动脉夹层患者，多平面重组有助于显示内膜瓣和破口部位。
电子束CT血管造影术用于胸主动脉瘤和主动脉夹层的诊断是可行的。
