Hi,

I recently ran several subjects through both a Linux version of FreeSurfer (4.5, 64bit) and a Mac version (4.5, 64 bit processors), and noticed some differences in the results. I know that you advise against comparing across different versions of FreeSurfer, but I wasn't sure about different platforms. Is there any thing I can do to make the results identical, or should I just make sure to process everything on one platform? Or is this something that will be fixed in an upcoming version of FreeSurfer like the Linux 32/64 bit issue?

Also I am a bit confused as to the 64 bit status of the Mac version of FreeSurfer. Obviously it runs fine on 64 bit machines, but are the binaries themselves 64 bit? When I run:

file /Applications/freesurfer/bin/[freesurfer executable]

it returns that the file is a i386 Mach-O executable. Am I correct in thinking that this means that the current Mac version of FreeSurfer does not run in 64 bit mode? And if so, are there any plans to release a Mac version in the future that does have 64 bit binaries?

Thanks in advance for for any answers,

- Tyler