Hello,
I am new to AFNI (in fact, I am using this week to try to see if I want to switch my lab from SPM to AFNI in the Fall). For the most part, I think that I have preprocessing working, except that I am hitting one nasty problem.

Half way through scanning, one of our participants asked to be pulled out of the scanner to adjust the headphones, and then went right back into the scanner to complete the task. We then altered the oblique angle to best match what we had for the earlier sessions. It was ~19degrees for the early and ~22degrees for the later.

The problem is that I can't figure out how to use these data together in AFNI. The raw data have the same image dimensions (64x64x33) but after I run 3dWarp or if I skip that and just try to combine later, I get errors that the data are in different meshes.

Using 3dinfo, I can see why. The earlier mesh is 64x73x55 voxels following the deoblique stage, and the later mesh is 64x74x58.

I was wondering if there was a way to get these images into the same mesh. A lot of space around the images is air, so I figured that we may be able to crop some slices. Or, perhaps add some zeros to pad the images (and make a common mesh with 64x74x58 voxels).

Any suggestions for a novice would be greatly appreciated.

Best,
Wil