[MINC-users] SNR question

[Maxime Descoteaux]

Hi all,

Is there a minc tool to estimate the SNR of an anatomical volume  
automatically?  I have a T2 volume of the human brain and would like  
to have an approximation of the SNR.

If no tool exist can I do the following:
-take a ROI in the background and compute the standard deviation of  
the signal in that ROI, std_background
-take a ROI in the brain and find the std_data
-SNR = std_data / std_background

The obvious question is how big and in which area should my data ROI  
be.  Containing both white matter and gray matter? or it doesn't  
really matter to obtain a rough estimation of the SNR.

thanks

Max