编码速率对基底动脉相位对比磁共振测量值的影响  

Flow Velocity Measurements of Basilar Artery Utilizing PCMRI with Different Velocity Encoding

作　　者：陈展航[1] 董天发[1] 钟熹[2] 麦慧[1] 黄健威[1] 

机构地区：[1]广州医科大学附属第三医院放射科,广东广州510150 [2]广州医科大学附属肿瘤医院放射科,广东广州510095

出　　处：《中国CT和MRI杂志》2016年第12期13-15,共3页Chinese Journal of CT and MRI

基　　金：广东省医学科学技术研究基金项目(A2015103)

摘　　要：目的探讨编码速率(Venc)对基底动脉(BA)相位对比磁共振成像(PC MRI)测量结果的影响。方法对36例健康成年志愿者行BA PCMRI测量,选用TOFMRI垂直BA中间段定位扫描,在PCA/M幅度像上沿边缘绘制感兴趣区。每例预置Venc 40、80、120、160、200 cm/s行5次扫描。取峰值流速(PV)、平均流速(MV)及平均流量(MF)进行分析。结果 Venc预置40cm/s均出现相位混淆现象。Venc预置80-160cm/s各指标均数间无统计学差异(FPV=0.46,FMV=0.07,F MF=0.17;P值均>0.05);Venc预置40-160cm/s、Venc80-200cm/s各指标均数间存在差异(FPV=37.22,FMV=57.92,FMV=34.72;FPV=11.81,FMV=7.23,FMF=9.01;P值均<0.01)。结论 BA PCMRI测量可行Venc区间为80-160cm/s。Objective To evaluate the normal flow velocity measurements of Basilar Artery （BA） utilizing phase contrast magnetic resonance imaging（PCMRI）, and explore the influences of different Velocity encoding（Venc） on the PCMR flow measurements of BA. Methods 36 healthy volunteers were recruited for research. For every volunteer, the localizer was placed perpendicular to ampulla region of the BA on TOF-MRA image with the Venc of 40, 80, 120, 160, 200 cm/s. The region of interest was drew in the PCA/M amplitude image when the BA could be seen optimally. The evaluated parameters were the peak velocity （PV）, mean velocity （MV）, and the mean flow （MF）. Using SPSS17.0 statistical analysis, P〈0.05 was considered statistically significant. Resu/ts When Venc was set 40cm/s, all phase images appeared phase confusion. When Venc was set 80-200cm/s, all parameters did not show any statistical difference（FPV=0.46, FMV=0.07, FMF=0.17, P〉0.05）. When Venc was set 40-200cm/s and 80-200cm/ s, all parameters showed prominent statistical difference（FPV =37.22, FMV=57.92, FMV=34.72, FPV=11.81, FMV=7.23, FMF=9.01, P〈0.01）. Conclusion The feasible Venc district was 80-160cm/s.

关 键 词：磁共振成像 相位对比 基底动脉 编码速率 

分 类 号：R543.5[医药卫生—心血管疾病] R445.2[医药卫生—内科学]