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Figure 2
Phase symmetry of a point in motion about an axis of rotation (a). A point object gives a simple sinusoid in the sinogram (b). The θ-sum of the full 360° sinogram gives an arcsine distribution symmectric about the rotation axis (c). Since any 180° projection pairs sample points on opposite ends of the θ-sum, they retain the same symmetry (d).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 29| Part 2| March 2022| Pages 488-495
https://doi.org/10.1107/S1600577521012777
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