Table 2.

Measured activity concentration in images from the Discovery MI and the Gemini TF compared to the true activity concentration (measured by ionization chamber)

	Discovery MI	Gemini TF
True activity concentration (kBq/ml)	19.64	19.53
Sphere diameter (mm)	Measured activity concentration (kBq/ml)
37	18.45	17.68
28	18.73	16.08
22	19.13	13.77
17	18.49	12.59
13	13.52	9.34
10	8.69	8.54