<div dir="ltr"><div><div>Hi Daniel,<br></div>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.<br></div><div>Best regards,<br></div>Simon<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Feb 11, 2018 at 8:18 AM, Daniel Xun Lin <span dir="ltr"><<a href="mailto:danielx.lin@gmail.com" target="_blank">danielx.lin@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi,<div><br></div><div>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.</div><div><br></div><div>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.</div><div><br></div><div>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.</div><div><br></div><div>I apologize if I am vague on any points or if anything is unclear, please let me know.</div><div><br></div><div>Thank you,</div><div>Daniel Xun Lin</div></div>
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