<div dir="ltr"><div>Hi,</div><div>This is not possible in RTK, the forward projections are just the line integral of a given voxelized volume. In the <a href="https://github.com/SimonRit/RTK/blob/master/include/rtkJosephForwardProjectionImageFilter.h#L170">Joseph forward projection</a>, there is a number of templated functors that can be changed to use a spectrum. They have been developed for Gate, see <a href="https://opengate.readthedocs.io/en/latest/tools_to_interact_with_the_simulation_actors.html#fixed-forced-detection-ct">here</a>. There, you can pass a full source spectrum to compute DRRs.</div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Apr 18, 2020 at 8:21 PM Isuru Suranga Wijesinghe <<a href="mailto:isurusuranga.wijesinghe@gmail.com" target="_blank">isurusuranga.wijesinghe@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi,<div><br></div><div><span style="font-family:Helvetica,Arial,sans-serif;font-size:15px">I’m currently working on generating DRR image from 3D CT volumes.</span><br style="font-family:Helvetica,Arial,sans-serif;font-size:15px"><span style="font-family:Helvetica,Arial,sans-serif;font-size:15px">Is there a way to configure beam characteristics such as filtration ?</span><br style="font-family:Helvetica,Arial,sans-serif;font-size:15px"><span style="font-family:Helvetica,Arial,sans-serif;font-size:15px">That is for an example we use a 120kVp beam, and the filtration is given as 16.25mmAl at 120kVp. Does RTK versions has two parameters to keep these two values (120 kVp and 16.25mmAl)</span> <br></div><div><br></div><div>Thanks and Best Regards,</div><div>Isuru</div></div>
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