主动脉夹层螺旋CT血管造影成像  

The Technique of SCTA Image in Aortic Dissection

作　　者：龚雪鹏[1] 宦怡[1] 尤志军[1] 白娅妮[1] 施伟[2] 

机构地区：[1]第四军医大学西京医院放射科,陕西西安710032 [2]第四军医大学校直门诊部

出　　处：《实用放射学杂志》2002年第7期602-604,共3页Journal of Practical Radiology

摘　　要：目的　探讨在主动脉夹层中进行SCTA的扫描参数。方法　回顾分析成功进行SCTA检查的 34例疑为主动脉夹层的病例 ,对照DSA或手术结果逐例观察、记录并分析所采用的CT扫描参数、影像后处理效果。结果　 34例中有 32例诊为主动脉夹层并正确分型 ,2例正常 ,2 5例并行DSA( 17例 )及手术 ( 8例 ) ,SCTA结果与之完全相符 ,图像效果好 ,成功率在 88.9%以上。其主要扫描参数的使用 :( 1)升主动脉夹层 :层厚 4mm ,重建间隔 2mm ,螺距 1.2 5 ,管电流 175mA ;( 2 )累及升、弓、降部及胸主动脉 :层厚 5mm ,重建间隔 2～ 3mm ,螺距 1.5 0 ,管电流 15 0mA ;( 3)累及腹主动脉 :层厚 6～ 8mm ,重建间隔 2～ 3mm ,螺距 1.5 0或 1.75 ,管电流 15 0mA。管电压均为 12 0kV ,造影剂用量均为 90～ 10 0ml,流速 3ml/s ;延迟扫描时间在胸主动脉取 2 0s ,腹主动脉 2 5s。影像后处理方法主要应用MPR、SSD、MIP、VR等 4种后处理方法。结论　合理地制定扫描计划 ,根据扫描范围选择、匹配好各种扫描参数 。Objective To study the scan parameter of spiral CT angiography in aortic dissection.Methods 34 cases with aortic dissection successively underwent SCTA were studied retrospectively.The CT scan parameters,methods of posteriorimage treating were reviewed and analysed one by one.Results In 34 cases,32 cases were diagnosed as aortic dissection and classified correctly,in accordance with the result of operation and DSA,the quality of image was satisfied and the rate of success at least above 88.9%.The use of main scan parameters:(1)the ascend aortic dissection:slice thickness 4 mm,reconstruction interval 2 mm,pitch 1.25;tube current 175 mA;(2)involed in ascend,arch,descend and throacic aorta dissection:slice thickness 5 mm,reconstruction interval 2～3 mm,pitch 1.5;tube current 150 mA;(3)involved in abdominal aortic dissection:slice thickness 6～8 mm,reconstruction interval 2～3 mm,pitch 1.5 or 1.75;tube current 125 mA.The tube voltage all were 120 kV,the dosage of contrast media was 90～100 ml;the delayed scan time was choiced 20 second in throacic aortic and 25 second in abdominal aortic.The posterior image methods main used MPR,SSD,MIP and VR. Conclusion To set a sensible scaning plan,choose and match scan parameters properly according to the scaning length,can avoid the shortage of restrain SCTA scaning length and get satisfied image.

关 键 词：主动脉夹层 螺旋CT 血管造影成像 容积重建 扫描参数 诊断 

分 类 号：R543.1[医药卫生—心血管疾病] R816.2[医药卫生—内科学]