<div dir="ltr"><div>Hi Vincent,</div><div>The RTK format for the description of phantom is not good. What happens is that it expects one of three values (A, B or C) to be 0 so that he knows the direction of the cylinder. I would suggest to switch to Fobild's format which is now well handled by RTK in opinion. See</div><div><a href="https://web.archive.org/web/20070611224909/http://www.imp.uni-erlangen.de/forbild/deutsch/results/drasim.html">https://web.archive.org/web/20070611224909/http://www.imp.uni-erlangen.de/forbild/deutsch/results/drasim.html</a></div><div>From the command line, switch to it with the --forbild flag.</div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Dec 14, 2023 at 11:31 AM Vincent Libertiaux <<a href="mailto:vl@xris.eu">vl@xris.eu</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">Hi RTK community,<br>
<br>
I am getting unexpected results (see attached picture) when designing a <br>
phantom.<br>
<br>
Here is my text file:<br>
<br>
[Box]  A=70  B=15   C=4 z=0,   x=0,   y=0,   beta=0, gray=1<br>
[Cylinder] A=0.8   B=15    C=0.8 z=0,   x=0,   y=0, beta=0,    gray=10<br>
<br>
And the command I use for drawing:<br>
<br>
rtkdrawgeometricphantom -o phantom.mha --phantomfile test.txt --spacing <br>
0.139 --dimension 1000<br>
<br>
I am expecting a cylinder across my box, but as you can see on the <br>
attachment, the cylinder's radius decreases along its axis.<br>
<br>
Could someone please give me a clue on what I am doing wrong ?<br>
<br>
Many thanks,<br>
<br>
Vincent<br>
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</blockquote></div>