TABLE 1

Equipment Design Parameters Used at Each Imaging Center Included in Study

Imaging center	Scanner	Image reconstruction	SPECT image matrix	No. of CT slices
C1	GE Discovery 670	OSEM	64 × 64	16
C2	GE Discovery 670	OSEM	64 × 64	16
	Siemens Symbia	3D-FLASH	128 × 128	16
C3	GE Discovery 670	OSEM	64 × 64	16
C4	GE Discovery 670	OSEM	64 × 64	16
	GE Hawkeye	OSEM	64 × 64	4
	Siemens Intevo	3D-FLASH	128 × 128	16

GE = GE Healthcare; OSEM = ordered-subset expectation maximization; 3D-FLASH = 3-dimensional fast low-angle-shot.