[Rtk-users] About SART

[Simon Rit]

Hi Andy,
If I understand you correctly, yes there is:
http://www.ucair.med.utah.edu/FacultyZeng/zeng-papers/Unmatched2000.pdf
But in rtksart, you can change the backprojector to a matched one with
the option --bp Joseph. Note that rtksart has not been tested in depth
so let us know if you encounter problems,
Simon

On Mon, Mar 11, 2013 at 7:32 AM, Andy Shieh <hsieandy at gmail.com> wrote:
> Hi Simon,
>
> I have a question regarding practical implementation of SART. As far as I
> know, one needs to find the ray-sum coefficient w_ij by bilinear
> interpolations to simulate the forward projection process. Then, the
> backprojection process is done in an algebraic manner using the w_ij we
> found according to the SART formula. However, according to a few open source
> codes I've found, as well as rtksart, I realize in many cases people simply
> use a traditional backprojection (with or without ramp filter) for the
> backprojection step. Is there any reference, or justification, that this is
> equivalent, or approximately equivalent, to the actual SART? Thanks!
>
> Not sure if I've described the question clear enough. Please let me know if
> it doesn't make much sense and I'll try to elaborate a bit more. Thanks :)
>
> Cheers,
> Andy
>
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