<div dir="ltr"><div><div>Hi,<br></div>Enclosed. Column 1 is platform angle, 2 is bb height, 3 is the u coordinate (in pixel) and 4 is the v coordinate (in pixel too).<br>I had approximately measured the source-to-detector (270) and source-to-isocenter (210) distances but they were still optimized to have a better assessment.<br></div>Simon<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Nov 24, 2016 at 7:34 AM, Sepp de Raedt <span dir="ltr"><<a href="mailto:sdr@nrtxray.com" target="_blank">sdr@nrtxray.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="auto">
<div>Hi Simon,</div>
<div id="m_5686893568563355912AppleMailSignature"><br>
</div>
<div id="m_5686893568563355912AppleMailSignature">Thanks for the script. I was wondering if you could also share the csv or a dummy file? I'm unsure of what the second column contains. An offset distance to the rotation axis? Or the height? </div>
<div id="m_5686893568563355912AppleMailSignature"><br>
</div>
<div id="m_5686893568563355912AppleMailSignature">Which distance was known in your example? From the code it looks like the distance to the rotation axis?<br>
<br>
Sepp</div><div><div class="h5">
<div><br>
On 22 Nov 2016, at 08.01, Simon Rit <<a href="mailto:simon.rit@creatis.insa-lyon.fr" target="_blank">simon.rit@creatis.insa-lyon.<wbr>fr</a>> wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>
<div dir="ltr">
<div>
<div>Hi Sepp,<br>
I did do a calibration script on a micro CT platform. The idea was that I had a bb taken from 4 different view points at 4 different heights with a known distance. Their projected position was segmented beforehand on the projections and I tried to match the
projections by optimizing the calibration (which we see in before.pdf and after.pdf). I don't think it's a good script, e.g., because I tried to find 8 parameters when 7 are sufficient for my system (see, e.g.,
<a href="http://iopscience.iop.org/article/10.1088/0031-9155/45/11/327/meta;jsessionid=8DD0F1160098FBC65BB161A0257FBA75.c3.iopscience.cld.iop.org#" target="_blank">
this paper</a>). But this gives you a starting point to develop your own script which will hopefully be better. Please share if you do something from it!<br>
</div>
Thanks,<br>
</div>
Simon<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Sat, Nov 19, 2016 at 8:51 PM, Sepp de Raedt <span dir="ltr">
<<a href="mailto:sdr@nrtxray.com" target="_blank">sdr@nrtxray.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi RTK users,<br>
<br>
I'm interested in reconstructing images acquired by a fluoroscopy system rotating around a knee phantom. Unfortunately, I've been unsuccessful so far. I recognize some of the phantom in the reconstructed image, but it contains double contours and the shape
is deformed.<br>
<br>
I think the issue might be incorrect geometry specification. I have images also including a phantom containing markers for which we know the coordinates, which should allow us to calibrate the system. On the wiki on image quality, I saw that some users had
developed scripts to do the calibration? Would someone be willing to share it?<br>
<br>
Kind regards,<br>
Sepp<br>
<br>
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<div><after.pdf></div>
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<div><before.pdf></div>
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<div><calib.py></div>
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