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Figure 2
Differences in reconstruction due to differences in backprojector and filter implementations. (a) A 33 × 33 phantom with one bright pixel. (b) Sinogram of the phantom (computed using a strip kernel from the ASTRA toolbox). (c) Differences in (unfiltered) backprojection when using different backprojectors: (left to right) backprojection using a CPU line kernel from the ASTRA toolbox, backprojection using a GPU pixel-driven kernel from the ASTRA toolbox, absolute difference between the two backprojections. (d) Differences in reconstruction when using different filtering routines in FBP with the gpu-pixel kernel as backprojector: (left to right) reconstruction using filtering in real space with the Ram–Lak filter, reconstruction using the ramp filter in Fourier space, absolute difference between the two reconstructions.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 28| Part 5| September 2021| Pages 1583-1597
https://doi.org/10.1107/S1600577521007153
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