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Figure 1
Schematic for PBI in cone-beam geometry. A diverging X-ray beam illuminates a sample with weak absorption, which is placed at a defocus distance z01. The sample imprints phase shifts onto the X-ray wavefront, which render into a measurable self-interference pattern on a detector, placed at distance z12 downstream of the sample, after sufficient free-space propagation. For tomography the sample is rotated and imaged at multiple angles.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 32| Part 6| November 2025| Pages 1586-1594
https://doi.org/10.1107/S1600577525008550
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