不同脂肪抑制技术对髋部体素内不相干运动成像参数的影响  

Effects of different fat suppression techniques on introvoxel incoherent motion parameters of the hip

作　　者：张思伟[1] 黄燕[1] 林俊杰[1] 梁爽[1] 易云平[1] ZHANG Siwei;HUANG Yan;LIN Junjie;LIANG Shuang;YI Yunping(Department of Radiology ,Guangdong Provincial Hospital of TCM,Guangzhou 510000,China)

机构地区：[1]广东省中医院芳村医院影像科,广东广州510000

出　　处：《实用放射学杂志》2018年第12期1941-1944,共4页Journal of Practical Radiology

基　　金：广东省科技计划项目(粤科规划字[-20151110号序号8).

摘　　要：目的探讨频率选择饱和(Fat sat)技术、精准频率反转恢复(SPAIR)技术和选择性水激发(Water Excit)技术对髋部体素内不相干运动(IVIM)成像参数结果的影响。方法随机选取47例女性志愿者行髋部1.5T MR扫描,包括常规序列和IVIM序列,其中常规T2WI及IVIM序列分别采用Fat sat、SPAIR和Water Excit 3种压脂方式。计算所得图像的信噪比(SNR)、对比噪声比(CNR)、变异系数(CV)、表观扩散系数(ADC)、快扩散系数(Dh)、慢扩散系数(Dslow)和灌注分数(F)值,并作统计学对比分析和一致性评价。结果(1)Water Excit压脂序列图像的ADC值、Dslow值高于Fat sat和SPAIR压脂序列,差异有统计学意义(P<O.05);而3种压脂序列的SNR、CNR、CV、Dslow和F值的差异均无统计学意义(P>0.05)。(2)Fat sat和SPAIR图像测量的结果具有较好的一致性。结论采用Water Excit脂肪抑制技术会对IVIM测得的ADC值和Dslow值产生高估可能,而采用Fat sat或SPAIR压脂方式则不会对IVIM测量结果产生影响。Objective To investigate the influence of fat suppression technique on the parameters obtained with introvoxel incoherent motion (IVIM)for the normal hip.Methods 47female volunteers were randomly selected to perform 1.5T MR examination with common sequence and IVIM sequence.The three different Fat suppression techniques:Fat sat,SPAIR and Water Excit were utilized respectively in T2WI sequence and IVIM sequence.The value of signal-to-noise ratio (SNR),contrast-to-noise ratio (CNR},coefficient of variation(CV), ADC,Dfast ,Dslow and F values for three methods were calculated and compared quantitatively.The consistency evaluation of these methods were also conducted.Results (1)ADC value and Dslow value obtained with the Water Excit method were higher than those with Fat sat and SPAIR statistically(Pal0.05),however there was no significant differences between the SNR,CNR,CV,Dfast and F values measured in three fat suppression methods(P>0.05).(2)The results of Fat sat and SPAIR techniques exhibited good consistency.Conclusion In Water Excit technique,overestimation of the ADC and Dslow values may be presented,while the IVIM measurement results are not influenced by the use of Fat sat or SPAIR method.

关 键 词：体素内不相干运动 磁共振成像 脂肪抑制 

分 类 号：R445.2[医药卫生—影像医学与核医学] R816.8[医药卫生—诊断学]