Hi

We are having a problem using 3dTshift and the -stim_nptr option of 3dDeconvolve. Our 3d+t datasets consist of 944 volumes (25 slices, acquired alt+z, TR 2000 msec). Our stimulus events occur at even multiples of 4 per TR. We have approached the process in the following order

1)to3d

2) 3dTshift -verbose -TR 2000ms -tzero 0.0 -prefix subj1_EP_tshift subj1_EP+orig.BRIK

3)3dvolreg - for motion corrected output 3d+t (plus registration parameters)

4) 3dDeconvolve (using -stim_nptr 4 for the stimulus events)

The problem is that 3dDeconvolve gives us the following error message:
"Must align all slices to 0 offset time, before using -stim_nptr option. See program 3dTshift. "

These input datasets ( the volume registered 3d+t datasets) have been processed with 3dTShift, and the slices should have been set to 0 offset time. There were no errors output from 3dTshift, and it seemed to run fine. Does using 3dvolreg AFTER 3dTshift cause this problem? Should we use 3dvolreg PRIOR to 3dTshift?

Thanks in advance,
Tim Souza
Jennifer Kim