I guess that's what Matt meant when he said "if you get the maths right"
Saad.
On 22 Jul 2011, at 14:03, Pablo Velasco wrote:
> Hi Daniela,
>
> Intuitively, I don't think this is correct: if you average two images taken with diffusion gradients in exact opposite directions, the average of the diffusion vectors will be zero. However, the average of the images will not. I guess if your rotated vectors are pointing almost along the same direction, the error you will get from averaging directions and images will be very small.
>
> Why don't you just do the analysis on a dataset with 72 directions?
>
> -Pablo
>
--
Saad Jbabdi
University of Oxford, FMRIB Centre
JR Hospital, Headington, OX3 9DU, UK
(+44)1865-222466 (fax 717)
www.fmrib.ox.ac.uk/~saad
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