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
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