Hi Francesco,
these look pretty bad. Can you describe the acquisitions? How many? Did you motion correct and average them? What is the resolution? What field strength? What receive coil(s)?
cheers, Bruce
On Thu, 16 Sep 2004, F.Musso wrote:
Hi to all,
In our last analysis, among 12 subjects after "-stage 1" and "-stage 2" we got only 3 reasonable brain surfaces. Most of the other brains have a very odd shape: -pieces of skull -coharse lack of cortex -holes -bridges -bad cutting planes -cerebellar attachments It seems to be a segmentation problem. How to solve some of these problems is clearly explained in the 'FreesurferGuide' but the whole analysis seems to be "too much affected"!
I have to fix those errors manually? Can repeat the -stage 1 changing some parameters in the intensity normalization and/or segmentation process? I attach some examples (small jpg files)
Thank you in advance.
Cheers Francesco Musso
Laboratory of Molecular Neuroimaging & Electrophysiology, Department of Psychiatry, Johannes Gutenberg-University, Mainz, Germany