Hi - so presumably any blurring in the overlaid activation is due to
intrinsic or applied smoothing to the data.
There's a FEAT sub-GUI for the overlaying stuff if you click on the
bottom-right button on the FEAT GUI ("Utils").
On Tue, 18 May 2004, Jane Aspell wrote:
> Hi Steve
> Yes, these look ok. a bit blurry around the edges but no worse than example data
> i've seen on fsl webpages.
> although feat has a registration part within it to view my activations on my
> highres brain it seems to be necessary to use flirt and to select the option to
> apply the transformation to secondary images (ie the stat images produced by my
> feat analysis).
> In message <[log in to unmask]>
> FSL - FMRIB's Software Library <[log in to unmask]> writes:
> > Hi - it's difficult to judge registration quality by looking at the
> > activation overlay - you should be clicking on the registration evaluation
> > image towards the bottom of the FEAT webpage report and look at the
> > detailed registration evaluation images - do they look ok?
> > Cheers, Steve.
> > On Mon, 17 May 2004, Jane Aspell wrote:
> > > Hi
> > >
> > > I'm having some problems registering my functional data onto a highres
> > > image of an individual subject's brain. My functional data is in the form
> > > of 24 obliquely oriented slices mainly covering the occipital area (it's a
> > > vision study). The clusters of activation seem to 'flame out' from the
> > > brain in some areas, into 'space' by a few millimetres. This problem seems
> > > to be worse in occipital areas and not so bad in parietal areas. I have an
> > > idea that occipital areas are subject to more distortion than other areas -
> > > is this true? To register my functional to a highres with flirt i did a 7
> > > parameter global rescale transformation from my 24 slice functional
> > > data to a 120 slice EPI (slices at the same angle as the functional) and
> > > another 7 param global rescale to my individual highres structural. is
> > > there anything you could advise i do to improve my registration?
> > >
> > > many thanks for your time,
> > >
> > > Jane Aspell
> > >
> > Stephen M. Smith DPhil
> > 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
> Dr Jane Aspell
> Department of Experimental Psychology, University of Oxford,
> South Parks Road, Oxford, OX1 3UD
> tel: +44 (0)1865-281606
Stephen M. Smith DPhil
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