Hi everyone,
I am trying to reconstruct a volume representing an aluminum casted part
and investigate the differences between FDK and SART.
Here are the parameters involved: the images are 700*820 pixels and I
have 900 projections. The physical pixel size is 0.28 mm and the sdd
and sid are 558.3 mm and 461.3 mm respectively, which gives me a
magnification factor of 1.2 roughly. I performed one iteration of SART
with CudaRayCast as forward and backward projectors and I wanted to
reconstruct a 700*700*700 volume with a 0.23 mm (= 0.28/1.2) voxel
size. The result is shown on the two pictures attached:
https://ibb.co/8sLdJxw
https://ibb.co/N3NLg2D
The result is getting worse as I increase the number of iterations
I have a hard time understanding where the stripes come from. A
reconstruction with the standard 256*256*256 volume and 1mm spacing
gives a "smoother" result, closer to what FDK gives. I thought it might
be related to the linear system resolution, but unless I am mistaken, I
am trying to solve a system with 700*700*700 unknown with 700*820*900
equations, which should be ok.
Furthermore, the reconstruction with FDK at the same "full" resolution
gives satisfactory results.
Any help/explanation will be greatly appreciated !
I thank you very much in advance,
Vincent
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