Dear Spmers,
I have two questions, the first is more important:
We want to do the statistical analysis for one subject on both the
normalised EPI data and the unnormalised data. Having performed identical
steps for each (except normalisation in one), in separate directories we
looked at the glass brain pictures.
In the normalised images we saw what we expected - several discrete blobs
of activation. However in the unnormalised data the whole brain was
coloured grey for the same threshold. Having moved the threshold higher we
could identify peaks corresponding to those seen in the normalised data.
Is this because our subjects brain was much smaller than the template or
are we missing something? We have performed these steps with another
subject and the normalised/unnormalised data look much more comparable at
the same threshold. We double checked the design matrix and estimation.
The second question is more cosmetic. In spm96 the coregistration option
provided columns of grey, white matter, csf and other. Is it correct that
spm 99 just gives columns of grey and white matter?
Any help would be greatly apprieciated,
Emma
,---------------------------------------------------------------------.
| Emma Williams |
| MRI Physicist, Wolfson Brain Imaging Centre |
+----------------------------------------------------------------------+
| Wolfson Brain Imaging Centre |Email: [log in to unmask] |
| |Phone email: [log in to unmask] |
| University of Cambridge, |Tel (MR suite): +44 1223 331821 |
| Box 65 Addenbrooke's Hospital|Tel (Analysis): +44 1223 762128 |
| Hills Road |FAX: +44 1223 331826 |
| Cambridge, UK, CB2 2QQ |http://www.wbic.cam.ac.uk/~ejw1001 |
`----------------------------------------------------------------------'
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|