Hi Fredrik, If the geometry and projection angles are known in advance, I
think it is possible to perform FDK online.
Regards, Chao

2018-02-22 11:11 GMT+01:00 Fredrik Hellman <fredrik.hell...@gmail.com>:

> Hi,
>
> I am wondering if it is possible to do "online" reconstruction with RTK
> using FDK backprojection, i.e. that you populate the geometry object angle
> by angle and backproject only one or a few projections at a time with the
> geometry object not fully populated initially.
>
> I have seen that the backprojection can be done projection by projection,
> but it seems that the geometry object must be populated with all angles
> before starting. For example in the code for parker weighting, it seems
> that the overscan angle is estimated based on the actual angles in the
> geometry object. Also, computing the angular gap weighting done in the 2D
> weighting depends on adjacent angles.
>
> Best regards,
> Fredrik Hellman
>
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