比较3.0T与5.0T MR胆胰管造影图像质量

Comparison on image quality of 3.0T and 5.0T MRcholangiopancreatography

目的比较3.0T与5.0T MR胆胰管造影(MRCP)图像质量。方法前瞻性纳入18例胆管扩张患者(胆管扩张组)和7名健康志愿者(健康组),采用3.0T和5.0T MR仪行MRCP,比较二者显示胆管树细节能力、信噪比(SNR)及图像伪影。结果胆管扩张组中,5.0T MRCP所示胆管树分支数目、分支总长度及最大分支长度均大于3.0T MRCP(P均<0.05);健康组中,5.0T MRCP所示胆管树分支数目及分支总长度均大于3.0T MRCP(P均<0.05)。2组5.0T MRCP的SNR均大于3.0T MRCP,但差异无统计学意义(P均>0.05)。3.0T与5.0T MRCP图像伪影差异无统计学意义(P=0.054)。结论5.0T MRCP所示胆管树解剖细节较3.0T MRCP更佳,而其SNR及图像伪影与后者相当。

Objective To compare image quality of 3.0T and 5.0T MR cholangiopancreatography(MRCP).Methods Eighteen patients with bile duct dilation(bile duct dilation group)and 7 healthy volunteers(healthy group)were prospectively enrolled.MRCP was performed with 3.0T and 5.0T scanners,respectively,and the ability for displaying details of bile duct tree,signal-to-noise ratio(SNR)and image artifacts were compared between 3.0T and 5.0T MRCP.Results In bile duct dilation group,the number of branches,total branch length and the maximum branch length of bile duct tree on 5.0T MRCP were all greater than those on 3.0T MRCP(all P<0.05).In healthy group,the number of branches and total branch length of bile duct tree on 5.0T MRCP were both greater than those on 3.0T MRCP(both P<0.05).In both groups,the SNR of 5.0T MRCP was greater than that of 3.0T MRCP,but the difference was not significant(both P>0.05).No significant difference of image artifacts was found between 3.0T and 5.0T MRCP(P=0.054).Conclusion 5.0T MRCP might display better anatomical details of bile duct tree than 3.0T MRCP,with SNR and image artifacts comparable to 3.0T MRCP.