Phantom Validation of Tc-99m Absolute Quantification in a SPECT/CT Commercial Device

Table 2

SPECT acquisitions of the NEMA/IEC NU2 phantom: Activity concentration in the background () and spherical inserts (), total activity deviation (), calibration factor (Bg. cal) and coefficient of variation (COV), lung variability ( lung), and hot contrast () for the 22 mm diameter hot insert.

NEMA; scan number			(%)	Bg. cal	COV%	lung%	(%); (22 mm)
Scan 1	23.27	196.87	2.5	1.06	20	5.78	65
Scan 2	18.30	154.82	1.1	1.03	24	5.70	67
Scan 3	12.32	104.20	−1	0.98	28	7.79	65
Scan 4	1.46	12.36	4	1.01	55	20.47	65