so i used 3dvolreg as follows:
3dvolreg \
-zpad 4 \
-twopass \
-tshift 0 \
-prefix subject_EPI_Alnd_anat \
-base subject_anat+orig \
subject_EPI+orig
printed the following while processing:
++ Coarse del was 10, replace with 2
it didn't do a very good job though, its way off in the Z-axis, and slightly so in the x and y axes.
any other suggetions?
i also tried @SUMA_Align_To_Experiment (which uses the -twopass option of 3dvolreg, among others). This didn't work very well either. I have to think that being able to align an anat to extra-session anat is more difficult than aligning EPI to intra-session (but highly displaced) anat. Guess not.
Let me know. Thanks.
kevin