Dear Kasper,

This is due to the different operating systems you are running not differences in the computers. Your iMac is running ~10.7 and your MacPro is running ~10.9. You should always run your analysis on the same operating system, however you should get no differences on different computers with the same operating system.

hth d

On Mon, Nov 2, 2015 at 11:47 AM, Kasper Jessen kasper_j@cnsr.dk wrote:

Dear FreeSurfer group,

I have tested the data output on the same subjects using the same FreeSurfer version but on different machines, a MacPro and a iMac. The output are different, which argues that it is important to run freesurfer on the same computer on all your subjects.

Is it due to a randomisation in freesurfer (maybe because of seed points)? Is it possible to get the same results even though you run in on different computers?

MacPro: build-stamp.txt: freesurfer-Darwin-lion-stable-pub-v5.3.0 Darwin mac-pro-2014.regionh.top.local 13.4.0 Darwin Kernel Version 13.4.0: Wed Mar 18 16:20:14 PDT 2015; root:xnu-2422.115.14~1/RELEASE_X86_64 x86_64

iMac: build-stamp.txt: freesurfer-Darwin-lion-stable-pub-v5.3.0 Darwin Nikolajs-iMac.local 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64

Best regards, Kasper Jessen

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