just the brain. For the spine you probably want to do it manually.
freeview can help with this - draw ROIs in the gray and white matter,
then look at the difference between the means (squared) divided by the
sum of the variance
On Thu, 31 Aug 2017, James Welsh wrote:
Thank you Dr Bruce for the info! Is this command works on T1 images acquired
from the spine or just
the brain?
____________________________________________________________________________________________________
From: freesurfer-boun...@nmr.mgh.harvard.edu
<freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of
Bruce Fischl <fis...@nmr.mgh.harvard.edu>
Sent: Thursday, August 31, 2017 10:08:17 AM
To: Freesurfer support list
Subject: Re: [Freesurfer] motion estimates
Hi James
after running recon-all you can use mri_cnr to measure CNR (which is
usually more interesting than SNR). Motion is harder. Martin investigated
this at some point, but I'm not sure where he left it
cheers
Bruce
On Thu, 31 Aug 2017,
James Welsh wrote:
> Dear Freesurfer experts, I want to inquire if there are any tools in
freesurfer that can help to
> evaluate T1 quality regarding motion and SNR.
>
> Thanks!
> James
>
>
>
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