[Rtk-users] Helical cone-beam reconstruction with RTK

[louie L]

Hi,

You can change the geometry. If changed correctly, most, if not all, the iterative cone beam reconstruction will work. 

Best regards,
Louie

Greetings from my iOS!

> On 26 Feb 2015, at 21:19, Robert Calließ <robert.calliess at gmx.de> wrote:
> 
> Hello Vahid,
> I think you need to add a new reconstruction filter for it. For the first projection the object usually is placed so that the
> resulting projection image covers the upper half of the detector. And you will need some additional handling (z-increment).
> I guess you could do a little work around with the current rtk. If you only reconstruct an rectangular roi around
> the detector’s center where the perspective distortion (because of the cone) is minimal. And then you add these
> seperate volumes to a final volume. This is just an idea. I do not know how the result will look like. Think of it like a TDI
> but with a wider sensor array.
>  
> I do not know the code in detail, but if it were possible to have seperate geometry settings for every projection image it
> would be possible to model the helical trajectory by the changing geometry without changing /adding code.
>  
> But let’s see what grandmasters of RTK will suggest.
>  
> Best regards,
> Robert
>                
>  
> Von: Rtk-users [mailto:rtk-users-bounces at public.kitware.com] Im Auftrag von vahid ettehadi via Rtk-users
> Gesendet: Donnerstag, 26. Februar 2015 20:35
> An: rtk-users at public.kitware.com
> Betreff: [Rtk-users] Helical cone-beam reconstruction with RTK
>  
> Dear RTK users,
>  
> 
>  
> I am using the RTK code to reconstruct the image for a bench-top micro-CT in a circular cone-beam geometry. It works well with FDK algo. Thanks RTK.
> I would like to change the current source trajectory from circular to helical. I was wondering is it possible to use the RTK for helical reconstruction only with some simple modification?
> I don't know well about reconstruction process and I don't know which type of modification is necessary to use RTK for a helical cone beam geometry. So, any suggestion and recommendation would be appreciated.
>  
> Sincerely,
> Vahid
>  
>  
> 
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