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

Table 1

Background activity concentration (), total activity deviation (), calibration factor (Bg. cal), and coefficient of variation (COV) for 4 SPECT acquisitions of a cylindrical homogeneous phantom.

Homogeneous; scan number	(kBq/mL)	(%)	Bg. cal	COV%
Scan 1	22	3.9	1.05	13
Scan 2	20	4.1	1.04	12
Scan 3	18	3.5	1.04	12
Scan 4	2	8.6	1.09	38