no result after performing one sample t-test for the mrehomap

hi
i got two rehomap after performing reho analysis. after that i used the mreho map for statistical analysis.
there was no error and t-test was completed sucessfully, but when i overlayed it on ch2 template image. it was just a blank image(like plain colour)
how to solve this and how can i perform statistical analysis of reho results. the manaul provided does'nt provide sufficient information.