[Rtk-users] rtkfourdfdk simulate motion artifacts?

[Simon Rit]

Hi,
Sorry but I don't understand what you're trying to do. The error message
you get is because your geometry is not correct so you should check it. If
you share the mhd header of the projection stack and the xml file for the
RTK geometry, we can try to understand what's wrong.
rtkfourdfdk reconstructs a 4D CBCT so it does not simulate motion
artifacts. If you compensate motion on a static image, you also remove
motion artifacts. If you want to simulate motion artifacts, I would do a
plain static reconstruction, e.g., rtkfdk, from projections of a moving
object.
Simon


On Wed, Mar 9, 2016 at 2:35 AM, Solomon Tang <solomoncztang at gmail.com>
wrote:

> Hi RTK users,
>
> I am trying to simulate motion artifacts in a phantom model. I have
> created a group of numberical phantoms, each one slightly shifted but with
> the same FOV, volume and origin. I am using the corresponding stack of
> projection files and an amsterdamshroud signal as an input to rtkfourdfdk
>
> However, I am getting an error that says :"Cannot account for too large
> detector displacements, a part of space must be covered by all projections.
> My phantoms are 2800,2800,20 with a spacing of 0.04 mm.
>
> My questions are how can I resolve this error, and is rtkfourdfdk even the
> function I want to use in the first place? Should I instead be trying to
> "compensate motion" on a static image? The end goal is to simulation motion
> artifacts that could be present in cardiac CTs.
>
> Thanks,
>
> Solomon
>
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