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
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
Thank you for your reply.
Okay - so if i understand it correctly, then both the OS version and the computer system (i.e processor) has to be the same.
What is the reason for the processer has to be the same?
Best regards, Kasper Jessen
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 listFreesurfer@nmr.mgh.harvard.eduhttps://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.
It is mainly the OS version, yet, sometimes the same OS can run on very different architectures (eg. on 32bit or 64 bit systems, or even tablets and phones), which could affect results. Starting with Lion, OSX only runs on 64 bit systems though.
Best, Martin
On 01/05/2016 02:09 AM, Kasper Jessen wrote:
Thank you for your reply.
Okay - so if i understand it correctly, then both the OS version and the computer system (i.e processor) has to be the same.
What is the reason for the processer has to be the same?
Best regards, Kasper Jessen
2016-01-04 15:31 GMT+01:00 Martin Reuter <mreuter@nmr.mgh.harvard.edu mailto: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 <mailto: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 <tel:%2B1-617-724-5652> Web :http://reuter.mit.edu _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto: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 mailto:kasper_j@cnsr.dk eller kasper.jessen@regionh.dk mailto:kasper.jessen@regionh.dk
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