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. Author manuscript; available in PMC: 2019 Dec 1.
Published in final edited form as: Med Phys. 2018 Oct 25;45(12):5397–5410. doi: 10.1002/mp.13226

FIG. 1.

FIG. 1.

Transaxial cross-sections of a phantom with: (a) six cold (no activity) piecewise constant spheres with radii of 4, 5, 6, 7, 8, and 9 mm, (b) eight point sources with maximum-activity-to-mean-background ratio of 100:1 at different radial distances from the central axis of the phantom, (c) six hot Gaussian blobs with radii (FWHM) of 4, 5, 6, 7, 8, and 9 mm with maximum-activity-to-mean-background ratio of 3:1 and (d–f) reference phantom containing warm Gaussian blobs only. Both phantoms were of the size 128 × 128 × 128 voxels, with voxel size set to 2.2 × 2.2 × 2.2 mm3.