大螺距双源CT在急性主动脉夹层诊断中的应用  

Application of high pitch dual source CT in the diagnosis of acute aortic dissection

作　　者：王西宾[1] 盛杰鑫 薛斌[1] 赵雪[1] 

机构地区：[1]汉中市中心医院医学影像科,陕西汉中723000

出　　处：《实用放射学杂志》2016年第7期1033-1035,1047,共4页Journal of Practical Radiology

摘　　要：目的：探讨大螺距双源 CT 低剂量血管造影技术在急性主动脉夹层（AAD）诊断中的应用价值。方法对21例疑似主动脉夹层的危重患者,采用第2代双源 CT Flash 技术（螺距3.2,100 kV,100 mAs）,使用较低的对比剂量（60 mL）,在不使用心电门控状态下行全主动脉造影检查。结果所有受检患者均在接受了尽可能低的辐射剂量及碘摄入量的同时,获得了准确的,包括主动脉内膜破口的位置、内膜片、真假腔及病变累及的范围等血管征象及解剖关系信息,Stanford A 型2例,B 型19例,2例主动脉破裂。平均扫描时间2.6 s,平均有效辐射剂量270 mGy＆#183;cm。结论大螺距双源 CT 低剂量血管造影技术配合低对比剂量,能快速获得满足诊断要求的优质图像,为全身重度复合伤的危重患者是否合并主动脉夹层提供了安全、可靠、即时的筛查方法。Objective To investigate the application value of low dose high pitch dual source CT angiography technique in diagno-sis of acute aortic dissection.Methods 21 cases of critically ill patients with suspected aortic dissection underwent total aortic angiog-raphy without using ECG by adopting the second generation dual source CT Flash Technology （pitch 3 .2 ,1 0 0 kV and 1 0 0 mAs）, using a lower contrast dose （60 mL）.Results All subjects accepted as low as possible radiation doses and iodine intake;at the same time,accurate information including aortic intimal tear position,intimal flap,true and false lumen,and lesions involving the range vessel signs and anatomic relationship were received,2 cases of Stanford type A,type B 1 9 cases （2 cases of aortic rupture）.Average scan time 2.6 s,average effective radiation dose cm 270 mGy＆#183;cm.Conclusion High quality images by using high pitch dual source CT low dose angiography with lower contrast dose provide safe,reliable,real-time screening method for critically ill patients with aor-tic dissection caused by systemic severe compound injury.

关 键 词：大螺距 计算机体层成像 辐射剂量 主动脉夹层 

分 类 号：R814.42[医药卫生—影像医学与核医学] R543.1[医药卫生—放射医学]