[Rtk-users] Geometry settings

[Guangming Zang]

Yes, sure. Simon. If you think the geometry setting is not correct from the
reconstructed images. Of course it is I that should  figure it out.
Thanks again for the help. :)
Regards
Guangming

*Guangming Zang (Alex)*
*King Abdullah University of Science and Technology(KAUST)*
*University of Chinese Academy of Sciences(UCAS)*




2015-06-02 21:15 GMT+03:00 Simon Rit <simon.rit at creatis.insa-lyon.fr>:

> Hi,
> Yes, after looking at the images again, there is clearly a geometry
> problem. I don't understand what is your geometry but since you have a
> lot of information for RTK geometry (wiki document + code), maybe it's
> up to you to figure it out?
> Good luck and regards,
> Simon
>
> On Tue, Jun 2, 2015 at 7:56 PM, Guangming Zang
> <guangming.zang at kaust.edu.sa> wrote:
> > Hi Simon,
> > Thanks for prompt reply.
> > Actually, i used one iteration in FDK reconstruction, and 20 iterations
> in
> > ADMMTV(5 conjugate gradient in each ADMM), which  is enough i think.
> > Now i am thinking maybe the problem is caused by geometry settings, and
> if
> > so, i really need your help:
> > In my own project, i use the "cone beam angle" and the "souce to
> isocenter
> > distance"(same as sid in RTK) to set the scene,please see the attached
> > geometry image.
> >
> > To make the same geometry in RTK ,  if the Projection size is A(pls see
> the
> > attached image), and the detector length is B(i.e., the projection image
> > size is B). in RTK ,
> > i set the SDD=SDD*B/A, and SID=SID. i thought it is correct because the
> > reconstructed volume size and slice size are same with ground truth, but
> i
> > am really not sure it is right or not.(the projection image is .bmp
> files,i
> > do not know the dpi)
> >
> > i do not know i described it clearly or not. if you need more information
> > ,please let me know.
> > Really appreciated for the help.
> > Regards
> >
> >
> > Guangming Zang (Alex)
> > King Abdullah University of Science and Technology(KAUST)
> > University of Chinese Academy of Sciences(UCAS)
> >
> >
> >
> >
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