[Rtk-users] SART vs FDK

[Simon Rit]

Hi,
This is a difficult question and I don't know the answer. I think what you
observe is the famous edge artifact of SART reconstructions. My feeling is
that that one can not trust values outside the FOV in any algorithm. I
would mask the FOV if I were you, whatever the algorithm. On real data, I
know it costs a bit of time but only a test with each initialization will
give you an answer.
BTW, do you know any publication on ROI reconstruction+TV ?
Simon

PS : I'm investigating the maling list issue, I'll let you know when I get
an answer.


On Wed, Apr 10, 2013 at 12:59 PM, MORY, CYRIL <Cyril.Mory at philips.com>wrote:

>  Hi Simon, Hi Marc,
>
>
>
> I’ve tried to send this mail to the mailing list, but it contains images,
> so a manual approval from the list’s manager is required.
>
> And last time I talked with Simon, he couldn’t find the interface to
> approve or reject the emails. So I forward it.
>
>
> Regards,
>
> Cyril
>
>
>
> *De :* MORY, CYRIL
> *Envoyé :* mercredi 10 avril 2013 11:54
> *À :* rtk-users at openrtk.org
> *Objet :* SART vs FDK
>
>
>
> Hi,
>
>
>
> I’m wondering whether the reconstruction results I get with SART and FDK
> are normal or not. I’ve performed reconstructions of a moving Shepp and
> Logan phantom, using 308 projections equidistributed on a 360° circular
> trajectory. The phantom is fully contained in the FOV. I’ve used the
> default projection and back projection operators for both SART (30
> iterations of SART instead of the default 5) and FDK. And there are very
> noticeable differences outside the FOV, especially at the edges of the
> projection cone, where SART produces high errors while FDK doesn’t.
>
>
>
> Is this a normal behavior ? I’m using these reconstructions to initialize
> an iterative algorithm, and my real data is truncated, so I’d prefer to use
> SART than FDK. These high errors outside the FOV make me hesitate, though.
>
>
>
> SART :
>
>
>
> FDK :
>
>
>
>
>
> Regards,
>
>
>
>
>
> ==========================================
>
> Cyril Mory
>
> PhD student at Philips Medisys and CREATIS
>
>
>
> Groupement Hospitalier Est
>
> Hôpital Cardiologique Louis Pradel
>
> Laboratoire CREATIS - Bât. B13
>
> CNRS UMR5220, INSERM U1044, INSA-Lyon, Univ. Lyon 1
>
> 28, Avenue du Doyen LEPINE
>
> 69677 Bron cedex FRANCE
>
>
>
> Office : +33 4 72 35 74 12
>
> Cell : +33 6 69 46 73 79
>
>
>
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