[Rtk-users] Isocenter question

[Simon Rit]

Hi,
If you want to move a volume around space and keep the same geometry for 
the source and detector positions, the best is to modify the origin of 
your itk image. I don't know what is the original file format but with 
mhd files, you simply have to change the Offset value in the mhd file.
Good luck,
Simon

On 04/02/2016 00:25, Solomon Tang wrote:
> Dear rtk-users,
>
> I am having success with forward projection and reconstruction of 
> complete cases much like in the example from the wiki. However, I am 
> interested in creating projections of cropped images. I took the 
> 00.mha from the example and cropped it. When I create the projection, 
> using rtkforwardprojections, the cropped projection rotates around the 
> isocenter of the original uncropped file around the AP axis as expected.
>
> Is there a way to create a projection of a cropped image such that the 
> cropped projection rotates around a newly centered AP axis?
>
> I am certain that the origin and spacing values of the geometry are 
> correct. I have tried messing with the sid and the sdd values but they 
> do not influence the distance between the isocenter and the cropped 
> object.
>
> Thanks
>
>
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