Hi Moreno,
> I am trying to calculate the Haemodynamic Response Function from fMRI
> images... any advices ??
As with so many things, spm has a solution for you :) The function you
look for is called spm_hrf, and takes your TR as the input, as in
TR = 3;
myhrf = spm_hrf(TR);
and you can check this by typing
figure; plot(myhrf)
which will give you the expected curve for your TR. If you want a
"classical" (nicer :) curve for teaching purposes, choose 0.01 or so.
You may also pass further parameters of the response function, as you
can see when you type
help spm_hrf
Cheers,
Marko
--
____________________________________________________
PD Dr. med. Marko Wilke
Facharzt für Kinder- und Jugendmedizin
Leiter, Experimentelle Pädiatrische Neurobildgebung
Universitäts-Kinderklinik
Abt. III (Neuropädiatrie)
Marko Wilke, MD, PhD
Pediatrician
Head, Experimental Pediatric Neuroimaging
University Children's Hospital
Dept. III (Pediatric Neurology)
Hoppe-Seyler-Str. 1
D - 72076 Tübingen, Germany
Tel. +49 7071 29-83416
Fax +49 7071 29-5473
[log in to unmask]
http://www.medizin.uni-tuebingen.de/kinder/epn
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