Hi,
Hard to quantify to be sure on this - but I would have thought that a
well-spaced set of 21 directions should not make too much difference
if the exact locations of the bvecs are changed a little between
different acquisitions - Tim or Saad can comment further if they
disagree.
Cheers.
On 9 Oct 2008, at 15:28, Jenifer Juranek wrote:
> Thanks, Steve.
> Could you help me understand "reasonably large"?
> Data has 21 directions (and a single b0).
> Reasonable to pool data across bvec variants?
> Interested in both quantitative metrics (FA, MD) and probabilistic
> tractography (in case definition of reasonably large varies by
> objective).
>
> Jenifer
>
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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
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