[Camino-users] FA interpolation and coordinate system

[Philip A Cook]

Hi,

NIFTI coordinate refer to the center of voxels, so if you define voxel space with an offset of 0.5, you would want to add that back in, yes.

You can get FA pointwise along the fibers with tractstats.


Phil

On Oct 15, 2012, at 4:09 PM, Yan Jin wrote:

> Hi,
> 
> I have a question about how to interpolate the FA value at a point on
> a fiber. I noticed that in the current version of camino, the physical
> coordinates of fibers refer to the CENTER of a voxel. So does that
> mean if I convert them to the voxel space, let's say I get the voxel
> index after conversion as (8.6, 9.2,3.5), should I add 0.5 on each and
> make it (9.1, 9.7, 4.0) as the actual voxel index to do FA
> interpolation at this point?
> 
> Also does camino provide FA interpolation point by point along the
> fibers? tractstatimage only provides min, max, mean, etc., not
> pointwise.
> 
> Thanks,
> Yan
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