TABLE 3

Results of Phantom Study for an ¹⁸F-FDG Concentration of 13 kBq/mL (n = 5)

		Sphere size (mm)
Acquisition time	Parameter	10	13	17	22	28	37
15 min		6,060	10,662	11,873	12,923	12,715	13,041
3 min	Mean (Bq/mL)	5,570	10,477	12,019	13,049	13,275	13,887
	SD	144	402	398	320	312	289
	CV	2.58	3.84	3.31	2.45	2.35	2.08
1 min	Mean (Bq/mL)	4,510	9,855	11,705	13,174	13,993	14,857
	SD	889	512	474	1048	80	428
	CV	19.71	5.20	4.05	7.96	0.57	2.88
	%Dif-index^*	−19.03	−5.94	−2.61	0.95	5.41	6.99
30 s	Mean (Bq/mL)	^†	9,356	11,947	13,133	14,901	15,822
	SD		1,233	990	1,101	695	475
	CV		13.18	8.29	8.39	4.67	3.00
	%Dif-index^*		−10.70	−0.60	0.64	12.25	13.93
15 s	Mean (Bq/mL)	^†	6,670	10,507	13,317	16,593	17,737
	SD		609	692	953	1,301	621
	CV		9.13	6.58	7.16	7.84	3.50
	%Dif-index^*		−36.33	−12.58	2.05	25.00	27.72

↵* %Dif-index = percentage difference compared with 3-min acquisition.
↵† Difficult to distinguish from background noise.