Hi,
This is part of the reason, yes. The other factor is that within the
centres of the tracts the FA may not be varying very quickly; this
also will therefore contribute to the smoothness of the skeleton-
projected data.
Cheers.
On 12 Jul 2007, at 15:31, Laura Mancini wrote:
> Hello,
>
> I have a question about the paper written by Steve Smith et al
> NeuroImage 31 (2006) 1487-1505. On page 1494, talking about
> multiple-comparison correction and why the Bonferroni correction would
> be over-conservative there is a sentence saying that "typically the
> final skeletonised FA data have intrisic smoothness of order of 4mm
> FWHM". Is that because the resolution of the acquired images is
> typically between 2x2x2 mm^3 and 4x4x4 mm^3 while the final MNI
> resolution is 1x1x1 mm^3 or for what other reason?
>
> Many thanks,
> Laura
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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)
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