<div dir="ltr"><div>Hi,<br></div><div>I have finally taken the time to reproduce and correct for the bug, see <a href="https://github.com/SimonRit/RTK/pull/380">https://github.com/SimonRit/RTK/pull/380</a>.</div><div>Sorry for the delay...</div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jun 30, 2020 at 6:45 AM Brani Rusanov <<a href="mailto:brani_rusanov@hotmail.com">brani_rusanov@hotmail.com</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">
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Sorry I forgot to mention, the Parker message only appears when reconstructing with CUDA enabled. </div>
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<div id="gmail-m_-3360275247733928720divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Simon Rit <<a href="mailto:simon.rit@creatis.insa-lyon.fr" target="_blank">simon.rit@creatis.insa-lyon.fr</a>><br>
<b>Sent:</b> Tuesday, 30 June 2020 5:22 AM<br>
<b>To:</b> Brani Rusanov <<a href="mailto:brani_rusanov@hotmail.com" target="_blank">brani_rusanov@hotmail.com</a>><br>
<b>Cc:</b> <a href="mailto:rtk-users@public.kitware.com" target="_blank">rtk-users@public.kitware.com</a> <<a href="mailto:rtk-users@public.kitware.com" target="_blank">rtk-users@public.kitware.com</a>><br>
<b>Subject:</b> Re: [Rtk-users] Insufficient Data For Proper Parker Weighting</font>
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<div>Hi,</div>
<div>No, I don't really understand what you're describing. It's probably easier if you can share the RTK geometry file and the header of your projection images (no need to share the data, I'll simulate some).</div>
<div>Thanks,</div>
<div>Simon<br>
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<div dir="ltr">On Mon, Jun 29, 2020 at 5:51 AM Brani Rusanov <<a href="mailto:brani_rusanov@hotmail.com" target="_blank">brani_rusanov@hotmail.com</a>> wrote:<br>
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<div style="direction:ltr">Hi Simon,</div>
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<div>Sorry for the late reply, I have been quite busy recently.</div>
<div style="direction:ltr">My projections are 1024x768. I cropped the largest dimension and noticed that "half the beam angle" value decreases slightly, gets close to the value 9.951, but with further reduction in dimension size the beam angle suddenly jumps
to ~20 degrees (observed value during reconstruction). So cropping the projection does not seem to solve the problem. Do you have any ideas how to fix this?</div>
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<div>If you require any geometry or projection files, I would be happy to send them over.</div>
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<div>Kind regards,</div>
<div>Brani</div>
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<hr style="display:inline-block;width:98%">
<div id="gmail-m_-3360275247733928720x_gmail-m_5175131324093883823divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Simon Rit <<a href="mailto:simon.rit@creatis.insa-lyon.fr" target="_blank">simon.rit@creatis.insa-lyon.fr</a>><br>
<b>Sent:</b> Monday, June 15, 2020 8:59:19 PM<br>
<b>To:</b> Brani Rusanov <<a href="mailto:Brani_Rusanov@hotmail.com" target="_blank">Brani_Rusanov@hotmail.com</a>><br>
<b>Cc:</b> <a href="mailto:rtk-users@public.kitware.com" target="_blank">rtk-users@public.kitware.com</a> <<a href="mailto:rtk-users@public.kitware.com" target="_blank">rtk-users@public.kitware.com</a>><br>
<b>Subject:</b> Re: [Rtk-users] Insufficient Data For Proper Parker Weighting</font>
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<div>Hi,</div>
<div>You are getting this because RTK detects that the scan is too short. Parker weighting requires pi + the fan-angle to be able to reconstruct exactly the central slice of your scan. Check
<a href="https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FSimonRit%2FRTK%2Fblob%2Fmaster%2Finclude%2FrtkParkerShortScanImageFilter.hxx%23L139&data=02%7C01%7C%7Cdd34d79ef19149c0573e08d81c72539c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637290624638730119&sdata=ULmc3xlN2%2FTJlHJpo%2FYGvVLVayVbnewu8r%2B%2FrhVD6Ew%3D&reserved=0" target="_blank">
here</a> how this is calculated in RTK.</div>
<div>Possible solutions are cropping the projections to reduce the fan angle. I'm not sure what are the consequences but they'll probably be small since not much is missing in your case. It's even likely that RTK could be improved by discretizing differently
the integral in parker weighting, in which case you'd get enough projections.</div>
<div>Simon<br>
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<div dir="ltr">On Mon, Jun 15, 2020 at 10:56 AM Brani Rusanov <<a href="mailto:Brani_Rusanov@hotmail.com" target="_blank">Brani_Rusanov@hotmail.com</a>> wrote:<br>
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<div>Hi,</div>
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<div dir="ltr">I am attempting to reconstruct Varian raw cone-beam data. The specific type of scan is a short scan, 200 degrees generating 501 projections. During reconstruction I get the message: “you do not have enough data for proper Parker weighting (short
scan) Delta is 9.951 degrees and should be more than half the beam angle I.e. 11.2359 degrees.”</div>
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<div dir="ltr">Since I have not generated the geometry myself, rather, used a pre-set Varian protocol, I am unsure why I get this error. </div>
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<div dir="ltr">How could I rectify this issue? Furthermore, what consequences are there to not applying a Parker weighting?</div>
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<div dir="ltr">The geometry header is attached.</div>
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<div dir="ltr">Your response is greatly appreciated,</div>
<div dir="ltr">Brani</div>
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