No. of DOI bins | ||||||
---|---|---|---|---|---|---|
Source | Axis | 20 | 10 | 5 | 2 | 1 |
1 (x = 0 mm) | x | 0.86 | 0.88 | 0.95 | 1.15 | 1.71 |
y | 0.95 | 0.97 | 1.05 | 1.30 | 1.55 | |
2 (x = 7.5 mm) | x | 0.80 | 0.80 | 0.84 | 1.01 | 1.00 |
y | 0.97 | 0.99 | 1.09 | 1.40 | 1.62 | |
3 (x = 15 mm) | x | 0.76 | 0.78 | 0.79 | 0.88 | 1.16 |
y | 1.03 | 1.03 | 1.09 | 1.32 | 1.93 |
Images were reconstructed by filtered backprojection with Shepp-Logan filter cut off at Nyquist frequency. FWHM was obtained by gaussian fitting. Distances of 3 line sources from center of field of view were 0, 7.5, and 15 mm. Scanner configuration is shown in Figure 1 (top). Data are millimeters.