Hi,
I was wondering if there is any documentation on mri_cnr, particularly how the noise is calculated.
Thank you,
Paul
>
> thanks Dr. B.....that helped a lot
>
> ----- Original Message -----
> Sent: Monday, June 18, 2012 2:27:29 PM
> Subject: Re: [Freesurfer] mri_cnr
>
> Hi KK
>
> this is something i wrote for myself, but you are welcome to try it out.
> YOu don't need to give it the slope stuff, that is optional. The "vol"
> command line parms are the volumes that you want to assess CNR in. For
> example:
>
> mri_cnr ~/local_subjects/bruce/surf ~/local_subjects/bruce/mri/norm.mgz
> processing MRI volume /homes/4/fischl/local_subjects/bruce/mri/norm.mgz...
> white = 95.8+-9.7, gray = 65.3+-17.9, csf = 40.1+-17.2
> gray/white CNR = 2.241, gray/csf CNR = 1.026
> lh CNR = 1.633
> white = 95.7+-9.9, gray = 65.5+-17.8, csf = 41.5+-17.4
> gray/white CNR = 2.205, gray/csf CNR = 0.937
> rh CNR = 1.571
> total CNR = 1.602
>
>
> On Mon,
> 18 Jun 2012, Kushal Kapse wrote:
>
> > hi fellas,
> >
> > i am trying to run mri_cnr command in freesurfer to compute and see CNR for gray/white/csf.... the command gives following info as help:
> >
> > -bash-3.2$ mri_cnr
> > usage: mri_cnr [options] <surf directory> <vol 1> <vol 2> ...
> > -s <slope fname> <dist in> <dist out> <step in> <step out>
> >
> >
> > i understand that 'surf directory'= subjects 'surf' folder ; but i am not able to figure out what it means by vol1, vol2 and slope fname......it doesnt show any error but just doesnt do anything even if i mention the surf directory to this command.....
> >
> > i checked on freesurfer mail archive, but no info since 2009 about any update on this command.....
> >
> > may someone please give an info if anyone ever used this command
> >
> >
> > thanks
> > kk
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