 |
 |
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). thanks, jane 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