相位编码方向对桥脑区弥散加权成像质量的影响  

Effect of phase encoding on diffusion weighted imaging quality in pontine

作　　者：戴艳芳[1,2] 陈楠 贾秀琴[1,2] 齐志刚 段祥攻[1,2] 李坤成 DAI Yanfang;CHEN Nan;JIA Xiuqin;QI Zhigang;DUAN Xianggong;LI Kuncheng(Department of Radiology,Xuanwu Hospital,Capital Medical University,Beijing 100053,P.R.China;Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics,Beijing 100053,P.R.China)

机构地区：[1]首都医科大学宣武医院放射科,北京100053 [2]磁共振成像脑信息学北京市重点实验室,北京100053

出　　处：《医学影像学杂志》2018年第4期517-520,共4页Journal of Medical Imaging

基　　金：北京市医院管理局重点医学专业发展专项经费(编号:ZYLX201609)

摘　　要：目的研究编码极相对桥脑区弥散加权成像(DWI)质量的影响。方法对121例因中枢神经系统疾病就诊行常规颅脑磁共振检查患者,同时行前后、后前两相位编码方向DWI扫描,采用配对样本秩和检验和独立样本秩和检验进行统计分析相位编码对桥脑区图像对诊断主观评分的影响,并分析伪影类型对该评分影响。结果对于桥脑区DWI,采用前后相位编码方向的诊断评分优于后前相位编码方向(Z=-6.959,P<0.001),拉伸伪影的评分优于压缩伪影(Z=-6.223,P<0.001),后前相位编码方向图像中伴有伪高信号者的诊断评分趋于更低(Z=-9.567,P<0.001)。结论桥脑区前后相位编码方向DWI磁敏感伪影对诊断的干扰小于后前相位编码方向。ObjectiveTo study the effect of imaging quality in pontine with different phase encoding on diffusion weighted imaging(DWI).Methods A total of 121 patients were enrolled in this study.For each subject,the protocol of DWI was repeated,acquiring both phaseencoding directions,anteriorposterior(AP)and posterioranterior(PA).The imaging quality of the two images and the influence of the artifact type on the score were analyzed.Statistical analysis was performed by using Wilcoxon paired signed rank test and MannWhitney U test.Results The imaging quality of AP phase encoding direction was superior to that of PA(Z=6.959,P<0.001).The score of tensile artifacts was better than that of compressive artifacts(Z=6223,P<0.001).The score of the pseudohigh signal in the AP phase encoding direction image tended to be lower(Z=9567,P<0.001).Conclusion The AP phaseencoding directions is superior to the PA in the diagnostic value for pontine.

关 键 词：桥脑 磁共振成像 磁敏感伪影 相位编码 

分 类 号：R743.33[医药卫生—神经病学与精神病学] R445.2[医药卫生—临床医学]