Hi, 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). 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. Simon
On Thu, Nov 24, 2016 at 7:34 AM, Sepp de Raedt <[email protected]> wrote: > Hi Simon, > > 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? > > Which distance was known in your example? From the code it looks like the > distance to the rotation axis? > > Sepp > > On 22 Nov 2016, at 08.01, Simon Rit <[email protected]> > wrote: > > Hi Sepp, > 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., this paper > <http://iopscience.iop.org/article/10.1088/0031-9155/45/11/327/meta;jsessionid=8DD0F1160098FBC65BB161A0257FBA75.c3.iopscience.cld.iop.org#>). > 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! > Thanks, > Simon > > On Sat, Nov 19, 2016 at 8:51 PM, Sepp de Raedt <[email protected]> wrote: > >> Hi RTK users, >> >> 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. >> >> 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? >> >> Kind regards, >> Sepp >> >> ______________________________________________________________________ >> This email has been scanned by the Symantec Email Security.cloud service. >> For more information please visit http://www.symanteccloud.com >> ______________________________________________________________________ >> _______________________________________________ >> Rtk-users mailing list >> [email protected] >> http://public.kitware.com/mailman/listinfo/rtk-users >> > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please visit http://www.symanteccloud.com > ______________________________________________________________________ > > <after.pdf> > > <before.pdf> > > <calib.py> > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please visit http://www.symanteccloud.com > ______________________________________________________________________ >
0,5,910,184 90,5,1022,181 180,5,1062,186 270,5,951,188 0,10,913,575 90,10,1025,573 180,10,1064,575 270,10,953,578 0,15,916,972 90,15,1028,971 180,15,1068,970 270,15,957,972 0,20,919,1369 90,20,1032,1369 180,20,1071,1366 270,20,961,1366 0,25,924,1760 90,25,1035,1761 180,25,1075,1755 270,25,964,1755
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