Application of single-breath-hold 3D-GRASE in MR cholangiopancreatography

ZHOU Liyu; ZOU Jianxun; CHEN Xugao; XIANG Wanqing; LI Wei

Abstract：Objective To evaluate the value of single-breath-hold 3D GRASE imaging in MR pancreaticobiliary duct.Meth-ods 57 patients with pancreaticobiliary diseases in our hospital were prospectively collected.All patients were scanned with 3D respiratory-triggered turbo self echo technique(3D-RT-TSE)and 3D breath-hold gradient-spin echo technique(3D-BH-GRASE),and the scanning time of the two methods was recorded respectively.The signal-to-noise ratio(SNR)of the common bile duct,the contrast ratio(CR)between the common bile duct and its surrounding tissues and the contrast noise ratio(CNR)between the common bile duct and the liver were measured and calculated.The image quality,artifact,background suppression degree and the display of the pancreaticobiliary duct were scored by two senior technicians,respectively.Results Compared with 3D-RT-TSE,the scanning time of 3D-BH-GRASE was significantly shorter(t=-70.995,P<0.001).The overall image qual-ity,artifact and effect score of pancreaticobiliary duct of 3D-BH-GRASE were better than those of 3D-RT-TSE,and the difference between the two methods was statistically significant(P<0.05).The SNR,CR,CNR and background suppression degree of 3D-BH-GRASE images were lower than those of 3D-RT-TSE,and the difference was statistically significant(P<0.001).Conclusion Compared with respiratory trigger(3D-RT-TSE),3D-BH-GRASE has shorter scanning time,better overall image quality and better display of pancreaticobiliary duct,which is worthy of further application.