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Figure 1
Pseudo-polar grid and pseudo-polar fast Fourier transform (PPFFT). For an N × N Cartesian grid where N = 8 in this case, the corresponding pseudo-polar grid is defined by a set of 2N lines, with each line consisting of 2N grid points mapped out on N concentric squares.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 24| Part 2| March 2017| Pages 490-497
https://doi.org/10.1107/S160057751700100X
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