【摘要】 目的:探讨多回波采集T2*WI的三维梯度回波序列(ESWAN)动脉成像(MRA)及静脉成像(MRV)的可行性。方法:11例健康志愿者均行回波数为11的ESWAN及3D-TOFMRA检查,其中7例还加做2D-TOFMRV扫描。仅保留ESWAN序列中动脉流入增强效应较强的前3个回波后处理获得的幅度图像,经最大强度投影重组Willis环图像,分析Willis环各段显示效果并与3D-TOFMRA比较;保留后7个回波的图像后处理得到的幅度图像,经最小强度投影显示颅内静脉,比较ESWAN与2D-TOFMRV对脑深部静脉的显示效果。结果:ESWAN与3D-TOFMRA对Willis环显示结果高度一致(P=1.00),ESWAN对大脑深部静脉的显示明显优于2D-TOFMRV(P<0.0001)。结论:合理设置ESWAN参数,可以实现同次扫描采集MRA及MRV。更多还原

【Abstract】 Objective:To assess the feasibility of ESWAN for the acquisition and depiction of both cerebral veins and arteries.Methods:A total of 11 healthy volunteers were scheduled to undergo both ESWAN with 11 echos and 3D-TOF MRA examinations,7 of them underwent additional 2D-TOF MRV examination.The postprocessing magnitude images of the former 3 echos with stronger enhanced arterial flow-on ESWAN sequance were reserved and then by the way of MIP to form the reconstruction images of Willis circle and then the visualized branches of Willis circle were compared with those presented by 3D-TOF MRA.Finally,the intracranial veins on ESWAN sequence acquired through postprocessing magnitude images of the reserved later 7 echos by the way of MinIP reformatuion were compared with those of 2D-TOF MRA especially for the deep cerebral veins.Results:The results in visualization of Willis circle showed the excellent coincidence between ESWAN-MIP and TOF-MRA(P=1).As regard to the visualization of the deep cerebral veins,the ESWAN-MinIP was considerably superior to the TOF-MRV.Conclusion:The simultaneous acquisition of MRA and MRV could be provided by utilization of ESWAN sequence with appropriate parameters.更多还原