TABLE 5.

FWHM image resolution of the line source phantom reconstructed with 20, 10, 5, 2 and 1 DOI bins. The images were reconstructed by filtered backprojection with a Shepp-Logan filter cut off at the Nyquist frequency. FWHM was obtained by Gaussian fitting. The distance of the three line sources from the center of the field of view was 0, 7.5 and 15 mm. The scanner configuration is shown in Figure 1 (top).

No. of DOI bins	20		10	5	2	1
Source 1 (x=0 mm)	x	0.86 mm	0.88 mm	0.95 mm	1.15 mm	1.71 mm
	y	0.95 mm	0.97 mm	1.05 mm	1.30 mm	1.55 mm
Source 2 (x=7.5 mm)	x	0.80 mm	0.80 mm	0.84 mm	1.01 mm	1.00 mm
	y	0.97 mm	0.99 mm	1.09 mm	1.40 mm	1.62 mm
Source 3 (x = 15 mm)	x	0.76 mm	0.78 mm	0.79 mm	0.88 mm	1.16 mm
	y	1.03 mm	1.03 mm	1.09 mm	1.32 mm	1.93 mm