Hi Bruce, Thanks for the help! I was thinking of the CSF as a homogeneous structure, but I will see what I get with the caudate.
Best wishes, Max On dijous 14 abril 2016 14:49 CEST, Bruce Fischl <fis...@nmr.mgh.harvard.edu> wrote: > Hi Max > > I don't think we output the background std, but depending on your goal > you could use the std of some relatively homogenous structure (caudate?) as > a proxy. This will probably overestimate it a bit. Alternatively you could > draw a background ROI and right click on it in freeview and it will allow > you to compute statistics. You could also use mri_vol2vol to map this > across subjects using the talairach.m3z and measure it in each one. > > cheers > Bruce > > On Thu, 14 Apr 2016, > BAUTISTA-PERPINYA Maximilià wrote: > > > Hi experts, > > > > I wish to calculate signal-to-noise ratio (SNR) of my T1 MRI images. Do you > > know if I can use freesurfer for this? > > SNR = mean signal at ROI / standard dev. of background noise. The mean > > signal at ROI I can obtain from the aseg.stats table, but I cannot seem to > > find a value describing the standard dev. of the background noise. Does > > anybody know if freesurfer can output this? Otherwise, how would you > > recommend to calculate it? > > > > Thank you for your help. > > > > Best, > > > > Max > > > > _______________________________________________ > > Freesurfer mailing list > > Freesurfer@nmr.mgh.harvard.edu > > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > > > > -- Maximilià Bautista-Perpinyà, BSc Master student at Joint Master in Neuroscience (JMN) Université de Strasbourg (in partnership with Universität Freiburg and Universität Basel) & Master Intern at Biological and Personality Psychology Laboratory Department of Psychology, Universität Freiburg (+49) 015759302368 maximila.bautista-perpi...@etu.unistra.fr maxbau...@gmail.com _______________________________________________ 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.
