[Insight-users] Transformation Matrix

[Karthik Krishnan]

On 5/15/07, Marco Zanger <marcozanger at gmail.com> wrote:
>
> Hi,
>
> I'm a student trying to fight against DICOM ugly registries. Using MATLAB
> and MIPAV I've been trying to realize how to calculate the Transformation
> Matrix in order to find an absolute Voxel position from a relative one. I
> red that DICOM (0020,0037) registry and from that i understood that it's
> information provides the directions cosines from x and y. from MIPAV and a
> certain image i got this example:
>
> (0020,0037) = 0.9966044465, 0, -0.08233827028, -0.005859506527, 0.99746231,
> -0.0709551988.
>
> And the MIPAV calculates the next matrix:
>
> 0,9966 -0,0059 0,0821 0,0000
> 0,0000 0,9975 0,0712 0,0000
> -0,0823 -0,0710 0,9941 0,0000
> 0,0000 0,0000 0,0000 0,0000
>
> As u can see, the first to columns are those described in the (0020,0037)
> registry, but the third one is being calculated in a mysterious way.


cross product of the first 2 .
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