[Rtk-users] Geometry settings

[Simon Rit]

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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