Hi again, while working with the new caret version 5.5 I encountered some new (at least to me) features that I have some questions to.
Preprocessing-question: a) When I load a 1x1x1mm T1-nifti image with a q-form that has some angle to it, the voxel-dimensions shown in caret are not 1x1x1 any more but eg 0.96x1.02x0.99. How is the image resample if I use Volume->edit Attributes->resample. -is it just a resampling in the 3 major dimensions or is the affine transformation of the q-form used? -would you recommend this kind of resampling in this case? b) Rescaling-Wish: I use an unbiased T1-image that has a few outliers. What I do now I only use voxels within a lower-upper threshold to rescale. Is there some option within caret to do this? If not, I think it would be nice ;-) c) Remark: I often have a discrepancy of search handles and topology report of the surfaces (both telling me no handles euler=2) on one hand and the volume->segmentation->topology report on the other hand. In the latter I often find euler=1, handles=1 d) Remark-Question: Segmentation volumes seam to be saved as float32 not gzipped per default. Is there a reason for this? e) separate brain extraction question: Do you think a brain extraction eg with bet before segmentation is help/harmfull? Sorry for the many questions but there's so much to explore in your wonderful program. Regards and Thanks, Roland -- Dr. Roland Marcus Rutschmann <[EMAIL PROTECTED]> Institute for Experimental Psychology, University of Regensburg Universitätsstraße 31, 93053 Regensburg, Germany Tel: +49 941 943 2533, Fax: +49 941 943 3233 http://www.psychologie.uni-regensburg.de/Rutschmann
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