Oks, thank you! Last question! And using CUDA this time... would the results also differ?
2016-11-15 16:18 GMT+01:00 Z K <zkauf...@nmr.mgh.harvard.edu>: > > > On 11/15/2016 07:21 AM, anonymous anonymous wrote: > >> Thank you so much for the extense answer! >> >> It happens that the person who analysed the first measure (of this >> longitudinal dataset) used two different OS (he did it in a Virtual >> machine on windows and a mac OS X) to speed up this step. That data has >> already been used in some studies. >> >> >> ¿So my question now would be how much does that really affect to the >> results? >> > > It is impossible to know for sure without processing the results on the > same OS. My guess is quite small, generally we see results differ on the > order of 5% or less, but still potentially enough to introduce bias. > > > > >> >> >> >> >> >> >> Hi >>> >>> I am using recon-all in some longitudinal data on a ubuntu 16.04, and >>> using >>> the development version of freesurfer as I was told here, because the >>> other >>> current version doesnt work on ubuntu 16.04. >>> >>> The problem is that the first scans were probablly processed using >>> virtualbox in a windows and an older version of freesurfer. >>> >>> >>> i think I already know the answer, that I can't do this if I dont want to >>> bias my results. Can I? >>> >> >> Yup. You know the answer ;) However, I did discover a way to make >> freesurfer 5.3 work on Ubuntu 16 by doing the following steps to install >> an older version of perl : >> >> 1) install perlbrew: >> >> $> sudo apt-get install perlbrew >> >> 2) use perlbrew to install perl version 5.20.3: >> >> $> perlbrew install perl-5.20.3 >> >> 3) You must change the '/bin/perl' file to a link which points to the >> version of perl installed by perlbrew. (This technique is not the >> standard practice but it is the only way to get the mni tools to use the >> older version of perl): >> >> $> cd /bin >> $> sudo mv perl perl.orig (can always set back later) >> $> ln -s ~/perl5/perlbrew/perls/perl-5.20.3/bin/perl >> >> >> >>> But I'm using a better computer now and I use the one with windows for >>> other analyses, so I wanted to know if I could install Virtual box on my >>> ubuntu 16.04 computer, and install the same version of linux used to >>> process the first measure. Should I also need to use the same version of >>> freesurfer? >>> >> >> >> You could do that, but The Virtual Box version is not really good for >> processing a large number of subjects because of the limited amount of >> disk space on the virtual image. Its really meant more as a teaching tool >> for users with Windows machines. >> >> >>> f the computer's specs are dfferent, does it matter? And if I assign >>> different cpu and ram on my virtual machine? >>> >> >> Different specs are fine. Its the OS, OS version, and version of >> freesurfer that should stay the same. >> >> >> >>> Thank you! >>> _______________________________________________ >>> Freesurfer mailing list >>> Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> >>> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >>> >> <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. >
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