Figure 1.

Transversal sections of PET scans of Derenzo phantoms (hole diameter ranging from 0.8 to 1.3 mm in 0.1 mm increments; 1.0 and 1.3 indicate the holes of 1.0 mm and 1.3 mm diameter, respectively) filled with (a) > 99% ⁴⁴Sc, (b) 66.2% ⁴³Sc/33.3% ⁴⁴Sc and (c) 98.2% ⁴³Sc. The acquisition of the PET scans was performed within the energy window of 400–700 keV for 30 min, in order to obtain a total number of ~6 × 10⁷ coincidences. Figure adapted from Domnanich et al. EJNMMI Radiopharmacy and Chemistry 2017; 2:14.¹⁵ PET, positron emission tomography.