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Figure 1
(a) Flat-field captured between t = 300 and t = 301 (the spatial inhomogeneity of the flat-field is quite pronounced with bright spots and an overall intensity gradient). (b) Raw projection at t = 300, where the two regions [\Omega_{\rm{l}}] and [\Omega_{\rm{r}}] are the blue shaded rectangles, and the central darker region is caused by the specimen absorption. (c) In a space-time ( r– t) diagram (sliced at a given height, z = 256 pixels) full flat-fields, f, are shown as red lines to indicate that they cover the entire detector but are captured only at some interruptions of the scan and sinogram borders [\Omega_{\rm{l}}] and [\Omega_{\rm{r}}] shown in blue to highlight that they are available at all times but only over a limited portion of the detector.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 24| Part 1| January 2017| Pages 220-231
https://doi.org/10.1107/S1600577516015812
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