[Rtk-users] CUDA Forward Projection Intensity Variance with Geometry Shift

[Simon Rit]

Hi Daniel,
I don't see how moving the source and the detector could trigger a drastic
drop in intensities. If you can send two geometry files (before and after
the drop), we can try to have a look.
Best regards,
Simon

On Sun, Feb 11, 2018 at 8:18 AM, Daniel Xun Lin <danielx.lin at gmail.com>
wrote:

> Hi,
>
> I am using the CUDAForwardProjection functionality of RTK through the
> SimpleRTK wrapper. I am trying to generate DRRs that are realistic and
> simulates fluoroscopic images of the structure and thus far I've setup the
> image spacing and pixel based on the dimensions of the C-arm that was used
> to acquire the CT and the fluoroscopic images and have gotten good results
> when the detector is simulated to have all angles at 0.
>
> However, when I attempt to simulate movement of the model (by changing the
> X/Y coordinate on the projection image of isocenter or by modifying the X/Y
> source offset), the overall intensity of my projection image sees a drastic
> drop.
>
> It would be greatly appreciated if anyone could advise on whether this may
> be an issue of me incorrectly setting my ConstantImageSource or if I am
> simulating the offset of my structures incorrectly.
>
> I apologize if I am vague on any points or if anything is unclear, please
> let me know.
>
> Thank you,
> Daniel Xun Lin
>
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