目的本研究的目的在于探讨 3.0T磁共振LAVA-FLEX动态增强扫描序列 在肛瘘诊断及分型中的应用价值。方法 术前行普通序列和LAVA-FLEX动态增强扫 描序列，统计分析不同扫描序列及动态 增强扫描序列各期对肛瘘内口及瘘管的 检出率。结果 对照手术结果，在肛瘘内 口及瘘管显示率上，AX LAVA+C显示率最 高,AX LAVA平扫显示率最低，8种序列按 序排列依次为AX LAVA+C、COR LAVA+C、 AX DWI、SAG LAVA+C、AX T2WI/FS、COR T2WI/FS、SAG T2WI/FS、AX LAVA，总体 进行X2 检验，P<0.001，差异有显著性意 义。在内口及瘘管的显示上，T2WI/FS与 LAVA增强序列对比来看，无论从内口的显 示来看，还是从瘘管的显示来看，LAVA增 强序列都优于T2WI/FS(P分别为0.006、 0.005)，差异具有统计学意义。结论 LAVA-FLEX增强MRI扫描检查方法能准确定 位各型肛瘘内口、走向，能准确显示与周 围组织的关系，分型较为客观准确，是术 前诊断各型肛瘘的一种值得推广的扫描方 法。

Objective It was to assess the application value of LAVA-FLEX sequences in determining the type of anal fistula and it was also to study the characteristics in dynamic inhancement phases. Methods 31 patients with surgically proved anal fistula underwent MRI examination.The following sequences were obtained: sagittal T2WI/FS、T2WI/ FS axial、T2WI/FS coronary、DWI、LAVA-FLEX, sagittal、axial and coronary LAVA-FLEX + C. Statistical analysis with surgical results was refered as standards.The value of MRI with various sequences in the diagnosis of various types of anal fistulas and their enternal openings was statistically analyzed according to surgical results. SPASS 17.0 software package was used to perform X2 test,t test,analysis of variance and there was statistically significant(P<0.05). Results On the display for internal openings and anal fistula,it showed highest rates reaching up to 88.09% and 87.8% in the AX LAVA-FLEX +C.It showed 8 sequences as follows: AX LAVA+C、COR LAVA+C、AX DWI、 SAG LAVA+C、AX T2WI/FS、COR T2WI/FS、SAG T2WI/FS、AX LAVA.It performed X2 test, the results of interal openings: X2 =28.886,P1=0.000, P1<0.001,the results of anal fistula: X2 =42.352,P1=0.000, P1<0.001, The difference was statistically significant. LAVA-FLEX inhanced sequence was better than T2WI/FS(P=0.006、0.005), there was statistically significant difference.It was compared with 6 phases ,contrast noise ratio showed from high to low equilibrium phase、venous phase、late arterial phase、 coronal phase、early arteral phase、sagittal phase、plain phase. Conclusion It showed highest rate in AX LAVA+C for kinds of sequences in MRI for ana fistula. It showed highest for contrast noise ratio in the equilibrium phase.