Table 2.

Tumor to blood, tumor to muscle and tumor to kidney ratios calculated from ex vivo biodistribution data for four studied ⁶⁸Ga-peptides and two ¹⁸F-tracers. Every tracer was evaluated at two times points of 30 min and 90 min post-injection. Data are presented as mean values (n = 3).

	68GA-DOTA-C(RGDFK)		68GA-NODAGA-C(RGDYK)		68GA-NODAGA-C(RGDYK)2		68GA-DOTA-SUBSTANCE P		18F-FDG		18F-FLT
	30 min p.i.	90 min p.i.	30 min p.i.	90 min p.i.	30 min p.i.	90 min p.i.	30 min p.i.	90 min p.i.	30 min p.i.	90 min p.i.	30 min p.i.	90 min p.i.
Tumor to blood ration	1.09	14.70	1.90	23.12	2.30	16.38	0.93	2.84	1.96	1.95	1.10	2.36
Tumor to muscle ration	2.42	13.53	3.23	6.51	5.84	10.47	3.10	6.45	2.67	3.58	1.31	2.83
Tumor to kidney ratio	0.29	1.43	0.36	0.90	0.61	0.91	0.14	0.04	1.01	2.21	0.76	1.79