Fig. 1From: Use of a digital phantom developed by QIBA for harmonizing SUVs obtained from the state-of-the-art SPECT/CT systems: a multicenter studyCorrelation of Tc-99m concentration of the NEMA phantom and counting rate in Discovery NM/CT 670 from the beginning (A) to the end (B) of the SPECT scan. There was a linear relationship between the radioactivity and counting rate. Tc-99m concentration for further phantom study was determined based on the counting rate of clinical bone SPECT/CTBack to article page