Hi, I have 12 runs of functional data I am trying to convert to FSFast formats and then preprocess. I have been using mri_convert to make my .img files into bshorts. However mri_convert makes only 30 files when my folders originally contained 37 or 73 files. Is this what it is supposed to do? I am also then trying to run preproc-sess on these files but i keep getting an error during the motion correction of the first run. it says can't register a 1 brick dataset to itself, and ERROR: 3dvolreg existed with status 1. I am using the command "preproc-sess -sf sessid -df sesspar -fwhm 6" for preprocessing and "mri_convert 028/f001.img 028/f_001.bshort" for file conversion. Does anyone know why my steps aren't working or knows of a better way to do these steps? Thank you so much, Margaret Duff