map small matrix

We have correlation matrix (264*264) for 140 subjects and used this matrices in GraphVar to obtained features in excel file such as Betweennes centrality feature (140 subjects*  264 features), then we used SVM classification and the resulted discriminant features was (140 subjects*  80 features). my question, how I convert this discriminant features into NIFTI Image to be used as input for 2 sample T-test in DPABI software???
Your help is appreciated.

I remembed someone (if not you) has asked how to write features back to NIfTI image a while ago. Please search this forum.