Doug,

We tried using 3dTshift again, just to make sure it was working, which produced the following output during processing:


3dTshift -verbose -TR 2000ms -tzero 0.0 -prefix subj1_EP_tshift_test subj1_EP+orig.BRIK

++ opening input dataset header
++ using tpattern = 0 1040 80 1120 160 1200 240 1280 320 1360 400 1440 480 1520 560 1600 640 1680 720 1760 800 1840 880 1920 960 ms
++ common time point set to 0
++ copying input dataset bricks
++ Time series length = 923; FFT length set to 960
++ slice 0: fractional shift = 0
++ slice 1: fractional shift = -0.52
++ slice 2: fractional shift = -0.04
++ slice 3: fractional shift = -0.56
++ slice 4: fractional shift = -0.08
++ slice 5: fractional shift = -0.6
++ slice 6: fractional shift = -0.12
++ slice 7: fractional shift = -0.64
++ slice 8: fractional shift = -0.16
++ slice 9: fractional shift = -0.68
++ slice 10: fractional shift = -0.2
++ slice 11: fractional shift = -0.72
++ slice 12: fractional shift = -0.24
++ slice 13: fractional shift = -0.76
++ slice 14: fractional shift = -0.28
++ slice 15: fractional shift = -0.8
++ slice 16: fractional shift = -0.32
++ slice 17: fractional shift = -0.84
++ slice 18: fractional shift = -0.36
++ slice 19: fractional shift = -0.88
++ slice 20: fractional shift = -0.4
++ slice 21: fractional shift = -0.92
++ slice 22: fractional shift = -0.44
++ slice 23: fractional shift = -0.96
++ slice 24: fractional shift = -0.48
++ writing output

We then tried using the 3drefit command you had suggested, which should remove the slice-offset correction and received the following message:

3drefit -notoff subj1_EP_tshift_test+orig.BRIK

++ 3drefit: Processing AFNI dataset subj1_EP_tshift_test+orig.BRIK
** -notoff: dataset has no time-offsets to clear!

Is there a tag produced by 3dTshift that is not being written to this dataset?

Thanks!
Tim Souza
Jennifer Kim