Hi - if you are doing affine registration (which is likely given that the
input is PET) then the main difference is that FLIRT starts by searching
across all possible initial orientations before starting the local
minimisations, whereas AIR carries out pure local minimisation starting
from the initial orientation. If you want to read more about some relevant
comparisons, see the results in a technical report (also published in
NeuroImage) at
http://www.fmrib.ox.ac.uk/analysis/techrep/tr02mj1/tr02mj1/node22.html
Thanks, Steve.
On Mon, 28 Apr 2003, Elyse R. Katz wrote:
> Hi all,
> I have been coregistering FDG-PET scans to T1-weighted structural
> MRI's (intrasubject) using AIR within Medx. FSL's FLIRT has just
> come to my attention as another option for doing these types of
> coregistrations. I understand that both methods have their strengths
> and weaknesses, but I'm not sure which method would be best for
> what I'm doing. Do you all have any opinions?
>
> Thanks!
>
> Elyse Katz
> UCLA, Neuropsychiatric Institute
>
Stephen M. Smith MA DPhil CEng MIEE
Associate Director, FMRIB and Analysis Research Coordinator
Oxford University Centre for Functional MRI of the Brain
John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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