【摘要】 目的探讨不同b值对肝硬化DWI纹理特征的影响。方法回顾性分析39例肝硬化患者的DWI表现,同时选取27名DWI图像肝脏正常者作为对照组,b值分别为0、20、50、100、200、400、800、1 000、1 200、1 500s/mm2。于DWI图像不同层面选取3个ROI,提取37个纹理特征。采用百分比变异系数(%COV)>15%筛选不稳定纹理特征,以指数拟合方法分析不稳定纹理特征与b值的拟合程度。结果 37个纹理特征中,20个(20/37,54.05%)纹理特征不稳定;随b值增大,其中10个纹理特征呈指数上升趋势,4个纹理特征呈指数下降趋势,其余6个纹理特征无法定义其与b值的相对变化趋势。结论 DWI的b值影响肝硬化背景下的纹理特征;部分纹理特征与b值存在相关性。更多还原

【Abstract】 Objective To investigate the impact of multi-b-value on texture features of DWI in liver cirrhosis.Methods DWI manifestations of liver cirrhosis in 37 patients were analyzed retrospectively,and DWI of 27 healthy volunteers(control group)were enrolled as controls.The b values were set as 0,20,50,100,200,400,800,1 000,1 200 and 1 500s/mm~2,respectively.Three ROIs at different levels of every set image were selected,and 37 texture features within these ROIs were extracted.Unstable texture features affected by different b-values were screened with the percent coefficient of variation(%COV),and the fitting degree between the unstable texture features and b values were analyzed with exponential fitting.Results Among 37 texture features,20(20/37,54.05%)were unstable.With the increase of b values,exponential upward trend was found in 10 texture features,exponential downward trend was found in 4 texture features,and the relative trends could not be defined in other 6 unstable texture features.Conclusion The b values of DWI impact the texture features in liver cirrhosis.Correlations exist among some texture features and b values.更多还原