Yes, you can even if you don't know the geometry in advance. The
application rtkinlinefdk and its code rtkinlinefdk.cxx illustrates this.
On Thu, Feb 22, 2018 at 2:05 PM, Chao Wu <wucha...@gmail.com> wrote:
> 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>:
>> 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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