Dear Juergen,
as far as I understand, to average and to smooth are commutative operators, so
the results will not depend on which one is applied first. So, it will be more
efficinet first averaging and then smoothing, because, in this way, you only
have to smooth one image.
Yours
Carles Falcon
SCT-University of Barcelona
Missatge de Juergen Haenggi <[log in to unmask]>:
> Dear SPM users
>
> I have a question concering the order of preprocessing steps when I intend
> to built own templates for optimized VBM. Some SPM user first averaging all
> images of a sample and then smoothing the averaged image. Other SPM users
> smoothing first all images and then averaging the smoothed images.
> Is there any important difference in the output image between the two
> different orders of averaging and smoothing?
> Which order is recommended?
>
> Thanks for help
> Juergen Haenggi
>
>
> ----------------------------------------------
> Juergen Haenggi, Ph.D. student
> lic. phil., Psychology & Neuroscience
> Oristalstrasse 46
> 4410 Liestal
> 0041 61 921 30 19 (home phone)
> 0041 76 445 86 84 (mobile phone)
> [log in to unmask] (email)
> [log in to unmask] (email)
> http://www.juergenhaenggi.ch (private website)
> ----------------------------------------------
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