Hi. Yes, we definitely appreciate ART!

However, I am in a similar situation where I have only a handful of subjects who completed both pre- and post scans following an intensive therapy. Normally we would exclude anyone who had more than 2mm translation and 3 degrees rotation (original voxel sizes are 4.25mm), but the number of subjects is precious few, and one of them has 8 degrees of rotation through the last 2/3 of the run.  Is there any general recommended cut-off (for example, 8 degrees is probably extreme and the subject should be omitted)? Or would ART effectively remove the offending scans, and then the problem becomes one of limited power?

Thanks for any help, as always!

Best,
Mary