<div dir="ltr"><div>Hi,</div><div>RTK forward projector only does the line integral of the volume. You should try to find what Plastimatch does exactly but I would try to add the following operations:</div><div>- Make air at 0 (if HU, air is at -1000 so add 1000 to your input volume)</div><div>- forward project</div><div>- multiply by -1 and take the log</div><div>All these operations can be pipelined with ITK filters except the forward projection.</div><div>It sounds like a very nice project, thanks for doing it and please let us know how it goes.<br></div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Nov 20, 2020 at 7:40 AM <a href="mailto:pmkclnl@yandex.ru">pmkclnl@yandex.ru</a> <<a href="mailto:pmkclnl@yandex.ru">pmkclnl@yandex.ru</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">Hello,<br>
<br>
I'm making a DRR computation module for 3D Slicer and now the module <br>
uses plastimatch reconstruct library for that purpose.<br>
<br>
As a alternative i think it will be good to use RTK forward projection <br>
calculation as well. I've made a simple example and the first question <br>
is how to fill the outer space of CT volume data to compensate borders <br>
so the DRR image background was uniform, or is there any other way to do <br>
such task?<br>
<br>
Source file, reconstructed images using plastimatch and RTK in attachment.<br>
<br>
Original DICOM data (anonymized): <br>
<a href="https://github.com/MichaelColonel/SlicerTestData.git" rel="noreferrer" target="_blank">https://github.com/MichaelColonel/SlicerTestData.git</a><br>
<br>
<br>
Best regards,<br>
<br>
MIkhail Polkovnikov<br>
<br>
<br>
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</blockquote></div>