摘要目的评估钆塞酸增强MRI和扩散加权成像(DWI)对新辅助化疗(NAC)后直肠癌肝转移(CRML)的诊断性能。方法本组研究人群包括77例病人140个转移瘤,且均在术前1个月内行钆塞酸增强MRI检查,分为2组:A组(未接受NAC,n=38)和B组(接受NAC,n=39)。2名放射科医师独立分析MRI影像并且对CRML的诊断可信度分5个等级。计算和比较两组的诊断准确度、敏感度和阳性预测值 Abstract Objective To evaluate the diagnostic value of gadoxaic acid-enhanced MRI and diffusion-weighted imaging (DWI) in the diagnosis of rectal cancer liver metastasis (CRML) after neoadjuvant chemotherapy (NAC). Methods The study population consisted of 140 metastatic tumors from 77 patients, all of whom underwent enhanced gadolinium increased MRI within one month before surgery. The patients were divided into two groups: group A (nAC: n = 38) and group B Accept NAC, n = 39). Two radiologists independently analyzed MRI images and rated the diagnosis of CRML as 5 levels. The diagnostic accuracy, sensitivity and positive predictive value were calculated and compared between the two groups