3.0T磁共振扩散加权成像诊断胰腺癌

目的 探讨3.0T MR扩散加权成像及其表观扩散系数(ADC值)对胰腺癌的诊断价值.方法 对经手术病理证实的胰腺癌患者30例及对照组30例行DWI检查(b值＝800 s/mm~2),测量肿瘤组织、瘤周组织及对照组正常胰腺组织的 ADC值,并对所得结果进行统计学检验.结果 ①肿瘤组织、瘤周组织和正常胰腺组织的平均ADC值分别为(1.494±0.273)×10~(-3) mm~2/s、(1.631±0.281)×10~(-3) mm~2/s和(1.778±0.237)×10~(-3) mm~2/s.单因素方差分析显示肿瘤组织与正常胰腺组织间差异有统计学意义,而肿瘤组织与瘤周组织间平均ADC值差异无统计学意义.②以肿瘤组织平均ADC值95%可信区间的上限(1.622×10~(-3) mm~2/s)作为诊断胰腺癌的上限阈值点,诊断的灵敏度、特异度、准确率、阳性预测值、阴性预测值分别为73.33%、86.67%、80.00%、84.62%、76.47%,ROC曲线下面积Az=0.800.结论 胰腺癌组织与正常胰腺组织间平均ADC值差异具有统计学意义,测量ADC值对于诊断胰腺癌具有一定帮助.

Utility of 3.0T MR diffusion-weighted imaging in diagnosis of pancreatic carcinoma

Objective To evaluate the ability of diffusion-weighted imaging(DWI)and the apparent diffusion coefficient(ADC)value in diagnosis of pancreatic cancer at 3.0T MR.Methods The diffusion-weigted sequences with b=800 s/mm 2 were performed in 30 patients of pancreatic cancer confirmed pathology,and in 30 control subjects with normal pancreas as well.ADC value of the cancer,pericancerous tissue and normal pancreas were recorded and statistically analyzed with ANOVA and ROC analysis.Results The mean ADC value of c...