MRI灰度直方图分析在髓母细胞瘤复发风险评估中的应用

摘要

目的 探讨MRI灰度直方图分析在髓母细胞瘤复发风险评估中的应用价值.方法 回顾性分析我院经手术病理证实的28例后颅窝髓母细胞瘤患者资料,根据术后随访3年内肿瘤是否复发将其分为复发组及未复发组,各14例.选取肿瘤MR增强矢状位图像最大层面,采用Mazda软件勾画ROI并进行灰度直方图分析,对2组肿瘤直方图参数特征进行统计学分析,获得2组肿瘤间差异有统计学意义的参数特征,并绘制ROC曲线,评价其对髓母细胞瘤复发的诊断效能.结果 利用直方图提取出的9个参数特征中,2组间峰度的差异有统计学意义(P=0.018),其ROC曲线下面积为0.776(P=0.018),最佳临界值为1.268,峰度鉴别肿瘤复发风险的敏感度、特异度分别为64.3％、71.4％.结论 MRI灰度直方图分析可作为评估髓母细胞瘤复发风险的重要辅助手段.%Objective To explore the value of MRI histogram analysis in the risk assessment of medulloblastoma recur rence.Methods The data of 28 patients pathologically confirmed of medulloblastoma was analyzed retrospectively.All patients were divided into recurrent group and the non recurrent group (each n=14).The ROIs were drawn on the maximum level of enhanced MR sagittal images,and the histogram analysis were performed using the software named Mazda.The statistical analysis was performed on the histogram parameters to find out the different characteristics between the two groups,and the ROC curve was drawn to evaluate its diagnostic efficacy for recurrence of medulloblastoma.Results In all of the 9 parameters which are extracted from histogram,kurtosis had statistical significance between the 2 groups (P=0.018).The area under the ROC curve was 0.776 (P=0.018),and the sensitivity and specificity of kurtosis in the risk assessment of medulloblastoma recurrence were 64.3％ and 71.4％,respectively.Conclusion MRI histogram analysis can be an important method to assess the risk of medulloblastoma recurrence.