增强MRA在急性肺栓塞诊断中的应用

目的 评价增强磁共振血管造影（ＣＥ ＭＲＡ）诊断急性肺栓塞的价值。材料与方法 对１１例疑有急性肺栓塞的患者进行肺部ＤＳＡ和ＣＥ ＭＲＡ检查。ＣＥ ＭＲＡ检查时，嘱患者屏气，于静脉内团注钆－喷替酸葡甲胺（Ｇｄ－ＤＴＰＡ）对比剂后行肺动脉期扫描，用３Ｄ自由感应衰减的射频扰相稳态梯度召唤回波序列采集图像。所有ＣＥ ＭＲＡ图像由２位ＭＲ诊断医师独立评估，并与ＤＳＡ诊断结果对比。结果 １１例患者中，ＤＳＡ发

Contrast-enhanced MR AngiographyIts Clinical Application in Diagnosing Acute Pulmonary Embolism

Objective To evaluate contrast enhanced MRA (CE MRA) in diagnosing acute pulmonary embolism (PE).Materials and Methods A total of 11 consecutive patients with suspected PE underwent both DSA and CE MRA. CE MRA was performed during suspended respiration at pulmonary arterial phase after intravenous bolus injection of gadolinium. A steady state gradient recalled echo sequence with 3D of free induction decay sampling technique was used.Results A total of 31 acute pulmonary emboli were depicted in 11 patients on DSA, while 28 of these emboli were depicted in patients on CE MRA. The CE MRA features of PE had direct signs and indirect signs. The direct signs were as follows: (1) central filling defect (n=8), (2) mural filling defect (n=14) and (3) total occlusion (n=2). The indirect signs included decreased vascularity, reduced pulmonary perfusion and marked dilatation of main pulmonary artery.Conclusion No radiation hazard and needless of using iodinated contrast media, CE MRA is a helpful non invasive technique for the diagnosis of PE.