Hello Freesurfers!

I am running a recon-all -long study and one of my subjects is giving me trouble. The brain segmentation volume for tp2 is greater than tp1.  The scans were taken from the same machine with the same parameters, but the dimensions are mismatched:

Volumes differ in dimension

v1dim 512 512 32 1

v2dim 560 560 30 1

I am worried that dimension mismatch is causing an error in brain volume estimation. I have tried reslicing v1 to v2 dimensions but freesurfer did not like it. Would a dimension mismatch lead to significant volume differences, and is there any work around? \

Thanks,

Ken