The values in the mask generated using TT_desai_ddpmaps atlas are not fractions or percentages. These values range from 0 to 255. I don't know how to change probability threshold with specific percentage or fraction into the threshold values corresponding to the values stored in this mask. Because I don't know what the unit of the values stored in the mask is. I guess value '0' is 0% and value '255' is 100% in the generated mask. If 30% probability is used as the threshold, is it right that my ROI mask is generated like this:

whereami -mask_atlas_region DD_Desai_PM:left:ctx_lh_G_insular_short -prefix insular_short
3dcalc -a insular_short+tlrc -expr 'ispostive(a/255*100-30)' -prefix myroi

Thank you very much!
I am very appreciated for your answers!



Edited 1 time(s). Last edit at 03/05/2018 12:57PM by Zhang Yu.