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

[susumu mori]

I see.
Xin and Andreia, I remember that we discussed about how we can apply manual
rotation to tensor files?

On Tue, Feb 26, 2013 at 10:22 AM, Dorian P. <alb.net at gmail.com> wrote:

> 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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>>
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>
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