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Figure 2
Schematic representation of a foam phantom, with an axial (i.e. horizontal) slice shown on the left, and a sagittal (i.e. vertical) slice shown on the right. The radius of the main cylinder is fixed to 1, with all other distances defined relative to this radius. Similarly, the attenuation coefficient of the main cylinder is fixed to 1 as well. Each void is characterized by its position xi, yi, and zi, its radius ri, and its attenuation coefficient ci. For one highlighted void, these parameters are shown in the figure. The vertical size of the phantom is defined by zmax. Note that zmax limits the position of the center of each void, which means that parts of a void can exist at positions larger than zmax or smaller than −zmax.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 29| Part 1| January 2022| Pages 254-265
https://doi.org/10.1107/S1600577521011322
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