[Mristudio-users] What is the formula to rotate tensors?

[Dorian P.]

Thank you Dr. Mori,

As mentioned before, my rotations have been done manually in Diffeomap on
the FA/B0 maps before applying AIR and later LDDMM. This procedure helped
AIR reach a good result. Without rotation and shifting, some of the
subjects had bad AIR results. Now I need to apply the same on tensors, but
there is no way to do manual rotations before applying the overall matrix
AIR->LDDMM.

Dorian

2013/2/26 susumu mori <susumu at mri.jhu.edu>

> If you want to do any transformation operation on a tensor file, you have
> to use DiffeoMap and load it through the "Open *.d" button.
> Then DiffeoMap knows the loaded files are tensor.
> You can find "Getting Started" here (
> https://www.mristudio.org/wiki/user_manual/diffeomap).
>
> Once a tensor file is loaded in this manner, AIR and LDDMM rotations will
> reorient the tensor directions when any rotation operations are performed.
>
> DtiStudio has AIR for intra-data coregistration. Because this is the
> pre-tensor-calculation phase, there is no tensor rotation involved.
>
> On Tue, Feb 26, 2013 at 9:01 AM, Dorian P. <alb.net at gmail.com> wrote:
>
>>  Hi MRIstudio list,
>>
>> I am returning to a previous topic with a detaled question. What would be
>> the formula to rotate the 6 tensors in space? DTIstudio cannot rotate
>> tensors manually but perhaps I can do this in Matlab. I need to do the
>> rotation to save some LDDMM transformations which always involved
>> preliminary manual rotation. Without it, I would have to run again AIR and
>> LDDMM on each subject.
>>
>> Thank you.
>>
>> P.s. If anybody knows how to read .dat files in Matlab, that may be a lot
>> helpful too.
>>
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