Hi, I have currently processed some 100 brains in freesurfer on different machines. Unfortunately, one machine was installed with version 3.0.3 (64 bit version), while the other machines were using version 3.0.1 (32 bit). It now looks like there is a systematic difference in the results from the various versions. I tested my suspicion by processing several identical volumes in both versions. The 3.0.3 version under-estimated the Intra Cranial Volume compared to the 3.0.1 version (around 75% of the 3.0.1-volume). Most other measures were slightly smaller, but no more than between 95-99% of the 3.0.1-volumes.
What is the reason for this? How much of the processing stream do I have to re-run?
Thanks,
Martin Ystad Medical Student University of Bergen, Norway.