I think I'd need to know a bit more about the problem in order to figure out what went wrong. My best guess at the moment is that if your files are *.nii.gz, then I'd suggest gunzipping them to *.nii files before trying them in SPM.Best regards,-JohnOn 15 September 2014 11:36, Roya Jalali <[log in to unmask]> wrote:HI everyoneI am a beginner in SPM and have problem in reading my data.I have converted my data from (philips scanner) PAR REC files to Nifti, but SPM doesnt read my files. should I convert to hdr img that I can analyse with slice timing correction? May I know what is the best way to convert them?Thanks--Sincerely Yours,Roya Jalali