I have an experiment with 3 different sequences, but the maximum difference I've found was 5% ----------------------------------------------------------- Pedro Paulo de M. Oliveira Junior Diretor de Operações Netfilter & SpeedComm Telecom --- Novo Netfilter 3.2 www.Netfilter.com.br --- Novo Netfilter Small Business
2009/9/4 sima chalavi <sima.chal...@gmail.com> > Hi Pedro, > Thanks for your reply, > > Actually I am using 6 different sequences for scanning the same subject, so > a small part of the difference could be because of randomness, but there > should be a way to select the best scan from these 6 different scans. I need > to know how to select the best. > > any suggestion? > > Regards, > Sima. > > 2009/9/4 Pedro Paulo de Magalhães Oliveira Junior <p...@netfilter.com.br> > >> Hi Sima, >> I've run 6 versions of the same scan of the same subject I got some >> differences too. Not so big as you found but still some differences >> >> Probably it's the -randomness flag in the recon-all >> >> Check: >> http://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg11235.html >> <http://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg11235.html> >> cheers >> ----------------------------------------------------------- >> Pedro Paulo de M. Oliveira Junior >> Diretor de Operações >> Netfilter & SpeedComm Telecom >> --- Novo Netfilter 3.2 www.Netfilter.com.br >> --- Novo Netfilter Small Business >> >> >> >> 2009/9/4 sima chalavi <sima.chal...@gmail.com> >> >>> >>> Dear Freesurfer experts, >>> >>> We performed 6 different (pilot) structural scans from the same subject >>> and analyzed the data using Freesurfer in order to find the best scan to >>> be used in our real experiment. >>> >>> We have checked the Freesurfer output visually and there do not seem to >>> be any problem as described in the trouble shooting manual. So all 6 scans >>> manage to get through the Freesurfer process just fine. >>> >>> >>> However, There are a lot of differences between the numerical results for >>> the different scans. Please find Attached graphs of (some of ) the results >>> of segmentation and parcellation of these 6 sequences from the statistical >>> outputs. >>> Now, the problem is how to select the best scan from these results. >>> >>> Does any body have a standard protocol for assessing images for analysis >>> or a standard metric, e.g. goodness of fit, from the software that we can >>> assess without having a gold standard? >>> >>> Or any other tip is also appreciated. >>> >>> Thanks in advance, >>> >>> Sima. >>> >>> >
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