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<p>Hi Simon,</p>
<p>thank you for the reply and the link. I realized that I forgot
the extra sid/sdd factor in my computation.</p>
<p>I wish you a pleasant day,</p>
<p>Vincent<br>
</p>
<div class="moz-cite-prefix">On 21.02.24 10:50, Simon Rit wrote:<br>
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cite="mid:CAF0oig1hMObR+tacTH3F1d97_G+2czpr50-JjmOfftVHRC=csg@mail.gmail.com">
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<div>Hi Vincent,</div>
<div>This is a problem we have investigated before. Check figure
1 of <a
href="https://aapm.onlinelibrary.wiley.com/doi/10.1002/mp.16869"
moz-do-not-send="true">this article</a>. If only the
detector moves, it must be limited to 50% to have the center
of rotation in the beam. If both move, the motion should be
limited to 50% of the detector size times the inverse of the
magnification ratio (0.5*detsize*sid/sdd).</div>
<div>I guess the error message is a bit misleading?</div>
<div>Simon<br>
</div>
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<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Feb 20, 2024 at
5:20 PM Vincent Libertiaux <<a href="mailto:vl@xris.eu"
moz-do-not-send="true" class="moz-txt-link-freetext">vl@xris.eu</a>>
wrote:<br>
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<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hello
RTK gurus,<br>
<br>
I have a question about half beam CT. I performed a simulated
CT with a <br>
detector displaced by half of its width and everything went
smoothly. I <br>
got a nice reconstruction.<br>
I then ran the same simulation but moved the object rather
than the <br>
detector this time (for practical reason, it is more likely to
happen in <br>
our real xray shots). In the rtk geometry, I imposed
proj_iso_x and <br>
source_x to be the same value, thus modelling a displacement
of the object.<br>
<br>
Unfortunately, I get a ITK ERROR: Cannot account for detector
<br>
displacement larger than 50% of panel size.<br>
<br>
The detector displacement is the same in both cases, so I can
only <br>
assumes the problem comes from shifting both the source and
the detector ?<br>
<br>
Did I do something wrong ?<br>
<br>
Thank you in advance for any help !<br>
<br>
Best regards,<br>
<br>
Vincent<br>
<br>
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