磁共振二维快速平衡稳态进动序列对主动脉夹层诊断的价值

目的 评价屏气二维快速平衡稳态进动序列(2D-FIESTA)在磁共振主动脉夹层(AD)多时相的成像特点及应用价值.方法 回顾分析5例采用2D-FIESTA多时相成像AD患者,Debakey Ⅰ型1例,DebakeyⅡ型1例,Debakey Ⅲ型3例,均采用心电触发的2D-FIESTA序列,呼气末屏气采集,采用主动脉长轴切面(平行主动脉弓斜位扫描)及横断面扫描,使用工作站AW4.2软件分析结果.结果 AD真、假腔显示率100%,内膜片显示率100%,内膜破口显示4例,附壁血栓显示2例,主动脉关闭不全显示2例,内膜破口血流喷射2例.结论 二维快速平衡稳态进动序列(2D-FIESTA)磁共振多时相成像在AD显示图像对比度高,伪影少,内膜片、内膜破口等显示清楚.

Application of breath hold two dimensional fast imaging employing steady state acquisition sequence for aortic dissection magnetic resonance many time phases imaging

Objective To evaluate the imaging characteristic and the value of application of breath hold two dimensional fast imaging employing steady state acquisition(FIFSTA) sequence, for aortic dissection(AD) magnetic resonance many time phases imaging. Methods To analyze retrospectively the manifestation of 5 cases with aortie dissection diagnosed, Bakey type Ⅰ,Ⅱ, Ⅲ, in 1, 1 and 3, all were examined using ECG triggered, two dimensional FIESTA sequence during end-expiratory breath hold. Scan with the long axes of aortic position(oblique position parallel with aortic arch) and transitional position. The results were analyzed by the soft of workstation AW4.2. Results The display rate of the true lumen and the false lumen of AD were 100% ,the display rate of membrane in aorta was 100% ,4 cases showed the hole of intimal tear,2 cases with thrombus,2 cases with aortic regurgitation,2 cases with ejecting in the hole of intimal tear. Conclusion Need not any contrast media, quickly acquired imaging, high contrast to noise ratio, least artifact,and especially show membrane in aorta and for the hole of intimal tear of aortic dissection(AD) magnetic resonance many time phases imaging with two dimensional FIESTA sequence.