TABLE 3

Percent Contrast, Background Variability, and Average Lung Residual of SET-3000 G/X Scanner Measured with Image Quality Phantom

	Sphere diameter (mm)						Lung insert (30 mm)
Parameter	10.0	13.0	17.0	22.0	28.0	37.0	Lung insert (30 mm)
L/B = 4
Hot-sphere recovery coefficient (%)	17.8	26.3	38.9	65.8
Cold-sphere contrast (%)					53.2	61.3
Background variability (%)	11.2	10.9	10.5	9.3	7.5	6.9
Average residual (%) over lung insert							30.2
L/B = 8
Hot-sphere recovery coefficient (%)	18.5	27.7	39.0	66.1
Cold-sphere contrast (%)					50.0	56.8
Background variability (%)	9.7	9.6	8.4	6.9	6.0	5.7
Average residual (%) over lung insert							29.3