Hi,
Depending on how your DTI images were produced/converted, you may need
to adjust the intensity display range in FSLView (the Min and Max
settings near the top). However, this intensity display issue won't
affect any processing with tractography, etc. If the tractography is
not working well then I suggest you go back and check the output of
dtifit first to make sure your input data is ok, then once you've
fixed that, rerun bedpostX.
Cheers.
On 27 Jan 2008, at 00:18, Anastasia Ford wrote:
> Hello,
>
> We are trying to do tractography analysis on the Philips 3T Achieva
> system. We have been able to
> fit the tensors, generate the FA maps, as well as map out some
> tracts. We are having difficulties
> with the scaling imposed by the DICOM out from Philips. Do you have
> any suggestions on how to
> rescale the data for FSLview? Also, we were wondering if there is a
> way to threshold the view of
> tracts based on the probability threshold. Finally, we are working
> on implementing the target
> classification tractography using a specified list of targets and
> applying the proj_thresh of the
> output volumes, but the images do not contain any data. Could the
> scaling issue be a problem for
> this analysis?
>
> Thanks,
>
> Anastasia
>
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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