[Rtk-users] SART vs FDK

[MORY, CYRIL]

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 :
[cid:image002.jpg at 01CE35E2.1DE522C0]

FDK :
[cid:image004.jpg at 01CE35E2.1DE522C0]


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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