摘要
目的通过采用不同的TSE factor、EPI factor组合,将屏气3D GRASE-MRCP序列的扫描时间缩短至15秒以内,并选出图像质量较佳的TSE factor、EPI factor组合。方法在3.0T上对31例患者分别采用5组不同TSE factor、EPI factor组合的3D GRASE-MRCP序列进行扫描,扫描时间均在15秒以内,对所得5组图像胆总管的对比信噪比(CNR)进行方差分析及两两对比;由三名高年资的影像科医师对5组序列的成像效果目测评分,组间对比采用Kruskal-Wallis H检验及两两对比。结果 5组图像的胆总管CNR中,组1(14*7)、组3(13*7)、组4(14*5)的CNR显著高于组5(14*9),其它组间两两对比CNR均没有显著差异。专家目测评分,组1评分显著高于组4、组5,组1与组2、3间无显著统计学差异。结论优化后的3D GRASE-MRCP序列扫描时间可缩短至15秒以内,更适用于临床。综合CNR定量分析及专家目测评分的结果,TSE factor、EPI factor的组合为14*7时图像质量较佳。
Objective To investigate the most appropriate value of TSE factor and EPI factor for accelerated 3 D GRASE-MRCP which is within 15 seconds. Methods Thirty-one patients underwent3 D GRASE-MRCP 5 times with different value of TSE factor and EPI factor at 3 T,the acquisition time of each sequence was less than 15 seconds. ANOVA and pairwise comparison were used to compare the contrast-to-noise(CNR)of common bile duct between 5 groups. The images quality of 5 groups were scored by three experienced radiologists. Scoring results were analyzed statistically with the KruskalWallis H test and pairwise comparison. Results The CNR of Group 5(14*9)was significantly higher than that of Group 1(14*7)、Group 3(13*7)、Group 4(14*5). The qualitative scores for Group 1 is significantly better than that of Group 4 and 5. Conclusion The acquisition time of accelerated 3 D GRASE-MRCP could be less than 15 seconds,which made it more feasible for clinical use. When the value of TSE factor and EPI factor were 14×7,it provided better CNR and image quality.
作者
苏赟
黎继昕
李靖雯
黎成
胡辉军
钟镜联
SU Yun;LI Jixin;LI Jingwen;LI Cheng;HU Huijun;ZHONG Jinglian(Department of Radiology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120;Department of Nuclear Medicine,The First Affiliated Hospital of Guangzhou Medical University,Guangzhou 510120,China.)
出处
《岭南现代临床外科》
2019年第5期525-527,532,共4页
Lingnan Modern Clinics in Surgery
关键词
磁共振胰胆管成像技术
磁共振成像
屏气
胆管
magnetic resonance cholangiopancreatography
magnetic resonance imaging
breath holding
biliary tract
