TABLE 4

Results of Phantom Study for an ¹⁸F-FDG Concentration of 7 kBq/mL (n = 5)

		Sphere size (mm)
Acquisition time	Parameter	10	13	17	22	28	37
15 min		2,881.29	4,896.79	5,548.12	6,111.37	6,370.27	6,500.82
3 min	Mean (Bq/mL)	^†	4,670	5,504	6,297	6,640	7,352
	SD		155	257	448	174	273
	CV		3.32	4.66	7.12	2.62	3.71
1 min	Mean (Bq/mL)	^†	4,517	5,547	6,602	7,282	8,240
	SD		428	211	214	704	530
	CV		9.48	3.81	3.25	9.67	6.44
	%Dif-index^*		−3.29	0.78	4.85	9.67	12.07
30 s	Mean (Bq/mL)	^†	2,501	4,986	6,792	8,486	9,469
	SD		745	761	683	1,232	426
	CV		29.78	15.26	10.06	14.52	4.50
	%Dif-index^*		−46.45	−9.43	7.86	27.80	28.79
15 s	Mean (Bq/mL)	^†	^†	4,384	5,544	7,327	9,275
	SD			630	709	1,208	868
	CV			14.36	12.79	16.49	9.36
	%Dif-index^*			−20.35	−11.96	10.34	26.15

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