[Rtk-users] rtk_fdk and redundant projections/angles

[Simon Rit]

Hi Guillaume,
Yes they are.
For FBP reconstructions, you have an integral over the source angle. When
discretized, you have a delta angle between adjacent projections. This is
done in the projection weighting of FDK. If you want to dig in the code,
look for GetAngularGaps in rtkFDKWeightProjectionFilter.txx
<https://github.com/SimonRit/RTK/blob/master/code/rtkFDKWeightProjectionFilter.txx>
.
For iterative reconstructions, we don't do anything specific and assume
that it won't be a problem since the system of equations is correctly built.
I hope this helps,
Simon

On Wed, Feb 10, 2016 at 10:57 AM, Guillaume Landry <
g.landry at physik.uni-muenchen.de> wrote:

> Dear rtk users,
>
> I am looking at Elekta CBCT data where the angle of the projections is
> more or less constant for the last ~7 projections (see attached pictures
> where abscissa is projection number and ordinate is the angle in
> degrees). This is for a short scan acquisition with the panel in the S
> position. I was wondering how this data is handled in the
> reconstruction. Are the projections weighted in rtk to account for the
> variable spacing?
>
> Thanks
>
> Guillaume
>
> --
> Dr. Guillaume Landry
> Ludwig Maximilians University (LMU) Munich
> Medical Physics
> Am Coulombwall 1
> 85748 Garching
> Tel:+49 (0) 89 289-14077
> Fax:+49 (0) 89 289-14072
>
>
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