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

Table 3

SPECT acquisitions of the liver phantom: activity concentration in the background () and spherical inserts (), total activity deviation (), calibration factor (Bg. cal) and coefficient of variation (COV), and hot contrast () for the three inserts.

Liver; scan number	kBq/mL	kBq/mL	(%)	Bg. cal	COV%	40 mm	30 mm	20 mm
Scan 1	77.79	404.57	1.9	1.08	8.47	68	51	30
Scan 2	62.13	323.09	0.1	1.07	8.99	67	51	29
Scan 3	42.05	218.70	−0.1	1.06	12.12	67	54	33
Scan 4	4.99	25.95	5.8	1.07	43.25	71	51	33