快速梯度自旋回波序列在3D磁共振胆胰管成像中的应用

The Application of Fast Gradient and Spin Echo Sequence in 3D Magnetic Resonance Cholangiopancreatography

目的探讨快速梯度自旋回波(GRASE)序列在3D磁共振胆胰管成像(MRCP)中的应用。方法选取2018年6月至2020年6月于医院采用Philips Ingenia 3.0T超导型MR成像系统、32通道相控阵直接全数字射频接收体部线圈行3D MRCP检查的患者60例,扫描序列包括快速自旋回波(TSE)序列和GRASE序列,比较两种序列的采集时间,并对两种序列的扫描图像进行主观和客观评价。结果GRASE序列对胆总管、胆囊管、主胰管、左右肝管的显示评分及图像伪影评分、图像质量总体评分均高于TSE序列,差异均有统计学意义(P<0.05)。GRASE序列的采集时间为16 s,较TSE序列的(399.06±84.53)s缩短约96%。GRASE序列的对比噪声比(CNR)高于TSE序列,差异有统计学意义(P<0.05);GRASE序列的信噪比(SNR)略高于TSE序列,但差异无统计学意义(P>0.05)。结论采用GRASE序列行3D MRCP检查可提高图像质量,缩短采集时间,保证CNR。

Objective The application of fast gradient and spin echo(GRASE)sequence in 3D magnetic resonance cholangiopancreatography(MRCP)was investigated.Methods With selection of sixty patients who underwent 3D MRCP examination using the Philips Ingenia 3.0T superconducting MR imaging system and a 32-channel phased array direct digital RF receiving coil in the hospital from June 2018 to June 2020,the acquisition times of the two sequences were compared,and the scanned images of the two sequences were subjectively and objectively evaluated,with the scanning sequence including turbo spin echo(TSE)sequence and GRASE sequence.Results The display scores,image artifact scores,and overall image quality scores of the GRASE sequence on the common bile duct,gallbladder duct,main pancreatic duct,left and right hepatic ducts were higher than those of the TSE sequence,and the differences were statistically significant(P<0.05).The acquisition time of GRASE sequence was 16 seconds,which was about 96%shorter than that of TSE sequence(399.06±84.53)seconds.The contrast to noise ratio(CNR)of the GRASE sequence was higher than that of the TSE sequence,and the difference was statistically significant(P<0.05);The signal to noise ratio(SNR)of the GRASE sequence was slightly higher than that of the TSE sequence,but the difference was not statistically significant(P>0.05).Conclusion The use of the GRASE sequence in 3D MRCP examinations can improve image quality,shorten acquisition time,and ensure CNR.