[Mrtrix-discussion] question about CSD

[Michael Zeineh]

Thank you Donald.

I see. So, for the example an axial DTI with thick slices but small in
plane voxels, a structure entirely in-plane would be resolved better
than if the same object were entirely through-plane (assuming things
like SNR are similar).

Michael

On Sun, Jan 17, 2010 at 3:18 PM, Donald Tournier
<d.tournier at brain.org.au> wrote:
> Hi Michael,
>
> Yes, it should work with anisotropic voxels (although isotropic would
> always be recommended). There is little point interpolating (at least
> not using linear interpolation), since the tracking code performs
> linear interpolation while tracking. In terms of bias, the
> orientations are provided with respect to real (scanner) coordinates,
> so do not depend on the voxel dimensions. There would however be a
> bias when tracking WM structures oriented predominantly through-plane
> versus in-plane, since the "effective resolution" would be higher in
> the first case. This applies to all tracking methods though, not just
> MRtrix (and is not a limitation of the CSD itself).
>
> Hope that helps,
>
> Donald.
>
>
> 2010/1/16 Michael Zeineh <mmzeineh at gmail.com>:
>> Out of curiosity, will it work on anisotropic diffusion data (i.e.
>> voxels are thicker along one axis)? If so, would there be any expected
>> errors or biases? Would simple interpolation (somewhat) resolve those
>> issues?
>>
>> Thank you,
>> Michael
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>
>
>
> --
> Jacques-Donald Tournier (PhD)
> Brain Research Institute, Melbourne, Australia
> Tel: +61 (0)3 9496 4078
>