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.
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