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Dear Satra, Thanks for your reply! Unfortunately, I am not familiar with python.. Do you have alternative suggestions? Maartje On 25-Jan-12 4:33 PM, Satrajit Ghosh wrote: > hi, > > if you are comfortable with python, you can do this very easily with > nibabel and numpy. there is also a TSNR interface in the nipype package. > > http://www.mit.edu/~satra/nipype-nightly/interfaces/generated/nipype.algorithms.misc.html#tsnr > <http://www.mit.edu/%7Esatra/nipype-nightly/interfaces/generated/nipype.algorithms.misc.html#tsnr> > > cheers, > > satra > > On Wed, Jan 25, 2012 at 9:53 AM, Maartje Luijten <[log in to unmask] > <mailto:[log in to unmask]>> wrote: > > Dear All, > > I would like to calculate voxel-wise signal to noise maps and > temporal signal to noise maps (functions in signal to noise over > time). > Does anyone knows how to do this (possible using imcalc or a script)? > > I searched on the mailinglist archives and found the message > below. Unfortunately, the message that is referred to is no longer > available. > > All suggestions are welcome. > > Thanks a lot! > Maartje > > Hi, > > If you want a voxelwise mean over a voxelwise standard deviation for a > bunch of images, i.e. you want an SNR image, then use spm_imcalc_ui as > in this post: > > http://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0608&L=SPM&P=R45864 > <http://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0608&L=SPM&P=R45864> > <http://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0608&L=SPM&P=R45864 > <http://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0608&L=SPM&P=R45864>> > > If you want mean over std of the voxels of a single image, then the > attached should do the trick. And if you want something else, please > ask again! > > Best, > Ged. > > > -- > Maartje Luijten, MSc > Institute of Psychology > Erasmus University Rotterdam > Woudestein T13-07 > PO Box 1738 > 3000 DR Rotterdam > The Netherlands > Tel: +31 10 408 9729 <tel:%2B31%2010%20408%209729> > Mob: +31 647 949 807 <tel:%2B31%20647%20949%20807> > Fax: +31 10 408 9009 <tel:%2B31%2010%20408%209009> > E-mail: [log in to unmask] <mailto:[log in to unmask]> > > -- Maartje Luijten, MSc Institute of Psychology Erasmus University Rotterdam Woudestein T13-07 PO Box 1738 3000 DR Rotterdam The Netherlands Tel: +31 10 408 9729 Mob: +31 647 949 807 Fax: +31 10 408 9009 E-mail: [log in to unmask]