2016-01-04 15:31 GMT+01:00 Martin Reuter <mreuter@nmr.mgh.harvard.edu>:

Hi Kasper,

this is because you use two different version of the OS (each coming with different sets of libraries). 11.4.2 is Lion from 2012. 13.4.0 is Mavericks from 2014.

You don't need to keep the computer fixed, but the OS should be the same (= here same means same version) and the system (ie processor).

Cheers, Martin

On 01/04/2016 05:58 AM, Kasper Jessen wrote:
Dear freesurfer,

As i understand from a previous forum thread, it is recommended that all the data is run on the same computer with the same operating system.

However, what is the reason for the differing results when I am running the same 10 subjects on a MacPro and iMac respectively (please see below):

MacPro:

build-stamp.txt: freesurfer-Darwin-lion-stable-pub-v5.3.0
13.4.0 Darwin Kernel Version 13.4.0

iMac:

build-stamp.txt: freesurfer-Darwin-lion-stable-pub-v5.3.0

11.4.2 Darwin Kernel Version 11.4.2

All the values are different. For example, the lh_caudalmiddlefrontal_thickness is on the iMac 2.472 and on the MacPro 2.537.

Is it because of a randomization generator in FreeSurfer?

Best regards,

Kasper Jessen
_______________________________________________
Freesurfer mailing list
Freesurfer@nmr.mgh.harvard.edu
https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
-- Martin Reuter, PhD Assistant Professor of Radiology, Harvard Medical School Assistant Professor of Neurology, Harvard Medical School A.A.Martinos Center for Biomedical Imaging Massachusetts General Hospital Research Affiliate, CSAIL, MIT Phone: +1-617-724-5652 Web : http://reuter.mit.edu
_______________________________________________
Freesurfer mailing list
Freesurfer@nmr.mgh.harvard.edu
https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

The information in this e-mail is intended only for the person to whom it is
addressed. If you believe this e-mail was sent to you in error and the e-mail
contains patient information, please contact the Partners Compliance HelpLine at
http://www.partners.org/complianceline . If the e-mail was sent to you in error
but does not contain patient information, please contact the sender and properly
dispose of the e-mail.

Kasper Jessen,

MD, PhD student
Center for neuropsychiatric Schizophrenia Research (CNSR)

Mental Health Centre Glostrup

Nordre Ringvej 29-67

2600 Glostrup
Tlf.: 24430136
E-mail: kasper_j@cnsr.dk eller kasper.jessen@regionh.dk