Table 1.

Spatial resolution results of the SAFIR prototype PET insert. All values are in mm

	FBP3DRP						MLEM
	Radial		Tangential		Axial		Radial		Tangential		Axial
RO${}^{\ast }$	HM${}^{\ast }$	TM${}^{\ast }$	HM	TM	HM	TM	HM	TM	HM	TM	HM	TM
At the center of axial FOV
0	1.28	2.69	2.38	4.12	2.63	4.59	1.26	2.66	0.85	3.03	1.13	2.04
5	2.82	5.61	2.04	3.82	2.83	5.15	1.08	2.51	1.19	2.39	1.23	2.56
10	3.25	6.99	2.26	4.42	2.85	5.21	1.74	4.49	0.94	1.88	1.24	2.63
15	3.37	11.45	2.91	6.13	2.87	5.28	0.78	4.13	1.16	2.30	1.15	2.07
20	2.91	7.07	3.07	5.52	2.89	5.32	1.94	4.10	1.57	3.10	1.18	2.12
25	3.42	12.75	3.11	5.9	2.89	5.33	1.28	3.50	0.95	3.54	1.19	2.28
30	3.42	11.46	2.82	6.36	2.91	5.37	1.89	5.21	1.35	3.28	1.18	2.13
35	3.75	11.68	3.02	6.98	2.91	5.38	2.36	6.28	1.74	3.67	1.17	2.11
40	4.33	11.55	3.15	8.99	2.96	5.49	3.87	6.82	1.97	3.53	1.18	2.13
45	4.68	12.06	3.22	8.46	2.91	5.29	3.49	7.14	1.66	3.55	1.29	2.79
At 1/4 of the axial FOV
0	1.88	3.54	2.01	3.62	2.86	5.19	1.10	2.29	1.06	2.35	1.14	2.05
5	2.88	5.78	2.21	4.17	2.93	5.27	0.70	1.56	1.17	2.05	1.16	2.09
10	3.63	7.28	2.37	4.64	2.94	5.28	0.88	4.45	0.94	1.92	1.15	2.06
15	3.3	7.62	2.97	6.16	2.96	5.31	1.57	4.26	1.49	2.96	1.16	2.08
20	3.16	13.6	3.06	5.51	2.96	5.33	2.23	4.45	1.73	3.53	1.18	2.28
25	3.65	13.81	2.95	5.86	2.98	5.35	1.05	3.65	0.73	2.64	1.19	2.34
30	3.94	14.14	2.71	6.05	2.98	5.35	1.89	5.15	1.25	3.30	1.33	2.85
35	4.05	13.74	2.69	6.3	2.99	5.35	2.59	6.38	1.61	3.04	1.26	2.70
40	4.64	12.47	2.99	7.36	2.99	5.36	3.29	6.58	1.52	3.35	1.26	2.69
45	4.78	13.02	2.96	7.48	3.02	5.42	3.14	6.85	1.41	3.04	1.28	2.77

*RO = Radial Offset; HM = FWHM; TM = FWTM