3.0T磁共振不同DWI序列在正常胰腺中的分析评价  

Evaluation of diffusion-weighted MR imaging sequences of normal pancreas at 3.0T

作　　者：姚秀忠[1] 冯豪[1] 陈文芳[1] 饶圣祥[1] 孙非 王鹤 曾蒙苏[1] 

机构地区：[1]复旦大学附属中山医院放射科,上海200032 [2]GE中国Healthcare,上海201203

出　　处：《中国临床医学影像杂志》2013年第1期17-22,共6页Journal of China Clinic Medical Imaging

基　　金：上海市级医院新兴前沿技术项目<胰腺癌诊断及治疗关键技术开发研究>;项目编号:SHDC12010120

摘　　要：目的:分析比较3.0T磁共振不同DWI序列在正常胰腺中的伪影及信噪比(SNR)。方法:在3.0T磁共振上,30例正常志愿者行常规T1WI、频率饱和脂肪抑制T2WI,MRCP,DWI及LAVE平扫,DWI序列均基于SE-EPI序列及b值为0和600 s/mm2,包括X、Y、Z三轴弥散梯度憋气DWI(BH600ALL)、Z轴弥散梯度憋气DWI(BH600SI)、呼吸门控DWI(TRIG600)、呼吸门控翻转恢复脂肪抑制DWI(TRIG600+BS)、自由呼吸翻转恢复脂肪抑制DWI(FB600+BS)及憋气翻转恢复脂肪抑制DWI(BH600ALL+BS),统计学比较分析不同DWI序列正常胰腺伪影评分值及SNR。结果:正常胰腺在TRIG600+BS序列伪影评分最低,胰腺轮廓清晰,呈均匀低信号,FB600+BS胰腺轮廓模糊,TRIG600胰腺多呈不均匀高信号,憋气背景抑制DWI伪影评分最高,单因素方差分析统计学有明显差异,P<0.001。正常胰腺在BH600ALL,BH600SI,TRIG600,TRIG600+BS,FB600+BS和BH600+BS六个DWI序列上的SNR有明显统计学差异,P<0.001,其中TRIG600序列的SNR最高,BH600+BS序列最低;在不同DWI序列中,胰头、胰体及胰尾的SNR逐渐增加,胰头与胰尾的SNR有统计学差异,P<0.05。结论:在3.0T MR仪上,TRIG600+BS中胰腺呈均匀一致低信号,轮廓清晰,图像质量优于其它五个DWI序列。Objective： To investigate the artifact and SNR of normal pancreas among different DW＇I sequences on 3.0T MR s cEinner. Methods： Thirty normal volunteers Underwent conventional TIWI, T2wi with Fatsat., MRCP, DWI and non-enhanced LAVA on 3.0T. Based on SE-EPI sequence and b values=O and 600 s/ram2, DWI sequences included breath-hold DWI with MPG pulses in X, Y,＇Z direction（BH600ALL）, breath-hold DWI with MPG pulses in Z direction（BH600SI）, respirat6Ltriggered DWI with MPG pulses in X, Y, Z direction （TRIG600）,. respiratory-triggered DWI with MPG pulses in X, Y, Z direction and inversion recovery for fat saturation （TRIG600＋BS）, free-breathing DWI with MPG pulses in X, Y, Z direction and inversion recovery for fat saturation （FB600＋BS） and breath-hold DWI with MPG pulses in X, Y, Z direction and inversion recovery for fat saturation （BH600＋BS）. Artifacts and SNR of normal pancreas were statistically investigated and compared among different DWI sequences. Results： Artifacts of normal pancreas showed noticeably statistical difference among different DWI sequences by ANOVA （P〈O.O01）. Normal pancreas displayed the lowest artifact scores i~ TRIG600＋BS and the highest artifact scores in BH600＋BS. SNR of normal pancreas showed noticeably statistical difference among different DWI sequences （P〈0.001）; Among six different DWI sequences, TRIG600 had the highest SNR, while BH600＋BS had the lowest SNR. The head, body and tail of p^increas had the increasing SNR in all six different DWI sequences and the statistical difference in SNR was noticed between the head and tail of pancreas （P〈0.05）. Conclusion： Normal pancreas in TRIG600＋BS displayed homogeneous hypointensity, edge sharpness and the superior image quality compared to other five DWI sequences on 3.0T MR.

关 键 词：胰腺 磁共振成像 弥散 

分 类 号：R322.491[医药卫生—人体解剖和组织胚胎学] R445.2[医药卫生—基础医学]