[Rtk-users] RTK geometry definition

[Simon Rit]

Hi Laura,
You have different answers to that question. First, you can change
OutOfPlaneAngle instead of GantryAngle to rotate around z but you also
have to change the other parameters to place the source adequately.
Refer to the geometry document for more details. Another option is to
change the direction of your input 3D image in which you backproject,
backproject and reset the direction to identity after backprojection
with itk::ChangeInformationImageFilter. You can do that with, e.g.,
"rtkbackprojections --direction 1,0,0,0,0,1,0,1,0" if you want to swap
y and z.
Simon

On Thu, Jun 20, 2013 at 9:21 AM, Laura Trubuil
<laura.trubuil at mail.medecom.fr> wrote:
> Dear RTK users,
> I have a question about RTK geometry definition, for the backprojection
> algorithm.
> The rotation axis is assumed to be y (from what I reconstruct, and from what
> I read in the RTK document about geometry definition).
> I want to change it, and use a geometry which uses z as rotation axis. Is it
> possible? If it is, which parameter do I need to change?
> Regards,
>
> Laura
>
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