磁共振三维PC法脑静脉血流成像研究

目的通过比较不同流速编码脑静脉(窦)的显示情况,选出3D/PC法脑静脉MRV的最佳流速编码.方法采用PHILIPSGYROSCAN-NT1.5T全身磁共振仪,对50例健康志愿者分别行15、20、25cm/s3种流速编码的3d/PC法脑静脉(窦)MRV,分析比较不同流速编码下各脑静脉(窦)的显示情况并作统计学处理.结果流速编码对较粗大的静脉(窦)显示率无明显影响,3种流速编码下显示率均达100%.较细小、变异大的静脉(窦)在不同的流速编码下,其显示率明显不同,其中以15cm/s显示最好,平均检出率为71%,明显高于20cm/s(62%)和25cm/s(48%)(F=27.725,P＜0.0005).结论15cm/s是3D/PC法脑静脉MRV的最佳流速编码,能很好地显示各脑静脉(窦),尤其是细小静脉(窦),具有较高的临床应用价值.

THE RESEARCH OF 3D/PC MRA IN THE CEREBRAL VEINS

Objective:To select the optimal velocity encoding (Venc) of 3D/PC MRA in the cerebral veins.Methods:3D/PC MRA at three velocity encoding(15cm/s,20cm/s,25cm/s) was performed on each of 50 healthy volunteers on PHILIPS GYROSCAN NT 1.5T hole body scanner.The images of the cerebral veins at different velocity were compared and analyzed.Results:Venc had no effect on showing the dural sinuses,such as superior sagital sinus,straight sinus,right transvers sinus and right sigmoid sinus,the presentation percentage is 100% respectively,while the presentation percentage of the left transvers sinus,left sigmoid sinus,superior cerebral vein and middle cerebral vein was significantly different at different velocity.The presentation percentage of 71% at 15cm/s was significantly higher than those of 62% and 48% at 20cm/s and 25cm/s respectively.Conclusion:15cm/s is the optimal velocity for 3D/PC MRA of the cerebral veins system,especially the smaller vein.It would be very useful for the physicians to evaluate the status of the cerebral veins.