[Rtk-users] About SART

[Andy Shieh]

Hi Simon,

Yes, this is exactly what I'm looking for! Thanks so much for your help!

Cheers,
Andy


2013/3/11 Simon Rit <simon.rit at creatis.insa-lyon.fr>

> 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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> >
>
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