Hi - if your runs are acquired directly after each other like this,
then, assuming there is little subject motion, you will be fine to
merge the data and the bvals/bvecs before running eddy_correct.
If you only want to reconstructy the tensor, then you won't need to
use bedpost - you can run dtifit instead.
Hope this helps
Tim
Tim Behrens
Centre for Functional MRI of the Brain
The John Radcliffe Hospital
Headley Way Oxford OX3 9DU
Oxford University
Work 01865 222782
Mobile 07980 884537
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www.fmrib.ox.ac.uk/~behrens
On 25 Jan 2006, at 17:59, Jenifer Juranek wrote:
> Hi,
> I am working with a 12 MDDW sequence on our Siemens 3T Trio
> scanner. NEX per
> run=3, so I capture 2 runs (one right after the other) to increase
> my number
> of averages to 6. I'm interested in reconstructing the diffusion
> tensor
> using FDT.
>
> 1) Is it reasonable to use avwmerge to merge both runs into a
> single file
> before running bedpost? Or should each run be processed
> independently and
> averaged "downstream" in the pipeline?
>
> Thanks for your advice!
> Jenifer
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