Application Value of 3.0T MR Diffusion Weighted Imaging in Assessment of Rectal Adenoma
Objective To assess the value of apparent diffusion coefficient(ADC)in predicting rectal adenoma with or not canceration before surgery.Methods The MRI and DWI findings of 71 patients(21 rectal adenoma,14 rectal adenoma canceration and 36 rectal adenocarcinoma)had pathological proved were retrospectively analyzed.DWI with b=0 s/mm2 and b=1000s/mm2 were acquired.Average tumor ADCs and minimum tumor ADCs were measured and compared between subgroups stratified by rectal adenoma,rectal adenoma canceration and rectal adenocarcinoma,independent sample t test was used to compare them.Results It showed that the differences of minimum tumor ADCs(1.126±0.134,1.015±0.107,P=0.015)between rectal adenoma group and rectal adenoma canceration group,average tumor ADCs(1.277±0.099,1.026±0.096,P=0.000)and minimum tumor ADCs(1.126±0.134,0.995±0.087,P=0.000)between rectal adenoma group and rectal adenocarcinoma group,average tumor ADCs(1.207±0.116,1.026±0.096,P=0.000)and minimum tumor ADCs(1.015±0.107,0.995±0.087,P=0.047)between rectal adenoma canceration group and rectal adenocarcinoma group.There was no significant difference of average tumor ADCs(1.277±0.099,1.207±0.116,P=0.064)between rectal adenoma group and rectal adenoma canceration group,minimum tumor ADCs was better than average tumor ADCs when it was used to predict rectal adenoma with or not canceration.Conclusion ADC values can effectively predict rectal adenoma with or not canceration.
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