[Insight-users] 3D image sub-volume and transform matrix

[Dženan Zukić]

The order in which you apply rotation and translation is important. Try the
opposite of what you are doing right now.

2011/11/15 Jeremy Lecoeur <jeremy.lecoeur at vanderbilt.edu>

> **
> So, if I got this right, my translation should be the difference (in mm)
> between the 1st voxel of each image and my rotation should be based on the
> three Euler angles.
> When I do that, the orientation looks good but not the the translation. Is
> there a trick related to the fact that the two images have different
> resolutions.
> Small volume is 0.0683 x 0.0683 x 0.5 mm and big volume is 0.5 x 0.5 x 0.5
> mm.
>
> Jeremy
>
>
> On 11/11/2011 02:39, Dženan Zukić wrote:
>
> Maybe this example will help:
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/VolumeRendering/itkVtkImageConvert
>
>
> On Thu, Nov 10, 2011 at 21:28, Jeremy Lecoeur <
> jeremy.lecoeur at vanderbilt.edu> wrote:
>
>>
>>
>> Hello,
>>
>> I have two 3D images, one is a sub-volume of the other but is not in the
>> same orientation.
>> For the big image, I know its size and also the coordinates in mm of its
>> first voxel with respect to a frame of reference.
>> For the small image, I know its size, the coordinates in mm of its first
>> voxel with respect to the same frame of reference and also the 3 euler
>> angles (phi, theta, psi) that defines its orientation.
>> With that, how can I compute the transformation matrix that will allow
>> me to see the small image in the big image, at the right place? I know
>> it's supposed to be fairly simple but I cannot figure it out.
>>
>> Jeremy
>>
>> --
>> Jeremy Lecoeur, Ph.D.
>>
>>
>>
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>
>
>
> --
> Jeremy Lecoeur, Ph.D.
> Research Associate
> Vanderbilt University
> Phone: +1 615 343 7798
> Fax: +1 615 343 5459
>
>
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