TABLE 1

Measurements Performed for the Evaluated Instruments

	Parameter
Device	Intrinsic uniformity	System uniformity	System resolution	Energy resolution	System sensitivity	Linearity	Tomographic uniformity	Center of rotation	Tomographic resolution	Total performance
Planar 1	+	+	+	−	+	+	−	−	−	−
Planar 2	+	+	+	−	+	+	−	−	−	−
Planar 3	+	+	+	−	+	+	−	−	−	−
SPECT 1	+	+	+	+	+	+	+	+	+	+
SPECT 2	+	+	+	+	+	+	+	+	+	+
SPECT 3	+	+	+	+	+	+	+	+	+	+
SPECT 4	+	+	+	+	+	+	+	+	+	+
SPECT 5	+	+	+	+	+	+	+	+	+	+
Planar 4	+	−	+	−	+	+	−	−	−	−
Planar 5	+	−	+	+	+	+	−	−	−	−

+ = measured parameter; − = not a measured parameter.