基于Hurst指数的脑胶质瘤分级方法

Grading method of gliomas based on Hurst index

目的基于复杂度分析对胶质瘤患者的磁共振大脑静息态数据进行描述,寻找基于复杂度分析的肿瘤分级的客观指标。方法基于复杂度赫斯特(Hurst)指数分析方法对被试者大脑肿瘤fMRI影像的功能信息进行提取和分析,并对肿瘤进行分级研究。首先基于MRIcro软件对患者肿瘤区域、对侧正常区域以及正常对照组的肿瘤对应区域进行提取;接着对提取出来的区域进行Hurst指数计算;然后对肿瘤区域及其对侧正常区域的Hurst指数值进行统计分析,对肿瘤区域及对照组同区域的Hurst指数值进行统计分析;最后将29例肿瘤患者样本按照病理等级进行分组,其中一级肿瘤患者10例,二级肿瘤患者7例,三、四级肿瘤患者各6例,对不同组别的Hurst指数进行双样本统计分析。结果被试肿瘤区域的Hurst指数值与肿瘤等级成正比关系,肿瘤等级越高Hurst指数值越大。统计分析表明不同级别肿瘤区域的Hurst指数差异具有统计学意义。低级别肿瘤Hurst指数范围为0.6381~0.6737,高级别肿瘤Hurst指数范围为0.7514~0.8194。结论Hurst指数分析方法可以区分低级别和高级别胶质瘤,可以为更细致的胶质瘤的等级划分提供帮助。

Objective To describe the MRI brain rest data of glioma patients based on complexity analysis,and to find objective indicators of tumor grading based on complexity analysis. Methods Based on the complexity of the Hurst index analysis method,the functional information of fMRI images of brain tumors was extracted and analyzed,and the tumors were graded. Firstly,based on the MRIcro software,the corresponding regions of the tumor in the patient’s tumor region,contralateral normal region,and normal control group were extracted;then the Hurst index was calculated for the extracted region;then the Hurst index value of the tumor region and its contralateral normal region was performed. Statistical analysis was performed on the Hurst index values in the same region of the tumor region and the control group. Finally,29 tumor patients were grouped according to pathological grade,including 10 primary tumor patients,7 secondary tumor patients,6 third- and fourth-grade tumor patients,and two-sample statistical analysis was performed on the Hurst index of different groups. Results The Hurst index value of the tumor region was proportional to the tumor grade. The higher the tumor grade was,the higher the Hurst index value was. The statistical analysis showed that the Hurst index of the tumor areas at different levels was significantly different. The Hurst index ranged from 0.638 1 to 0.673 7 in low-grade tumors,and from 0.751 4 to 0.819 4 in high-grade tumors. Conclusions The Hurst index analysis method can distinguish between low-grade and high-grade gliomas,and can provide help for more detailed classification of gliomas.