Table 3.
Reconstructed image CNR and FWHM sphere size. (See Fig. 3 for the orientation of x, y, and z.)
| Single LSO array events only | Single LSO array and MIPES (weighted mean) | Single LSO array and MIPES (max. likelihood) | |
|---|---|---|---|
| ϕ=2 mm spheres | |||
| Peak CNR | 4.24 | 2.98 | 4.53 |
| x size (mm) | 2.1±0.4 | 2.3±0.6 | 2.1±0.4 |
| y size (mm) | 1.6±0.3 | 1.7±0.4 | 1.6±0.3 |
| z size (mm) | 1.6±0.3 | 1.8±0.3 | 1.6±0.2 |
| ϕ=4 mm spheres | |||
| CNRa | 5.88 | 5.36 | 6.16 |
| x size (mm) | 3.7±0.5 | 3.9±0.5 | 3.6±0.5 |
| y size (mm) | 3.2±0.4 | 3.3±0.3 | 3.1±0.3 |
| z size (mm) | 3.2±0.4 | 3.2±0.4 | 3.1±0.3 |
| ϕ=8 mm spheres | |||
| CNRa | 6.69 | 7.04 | 7.23 |
| x size (mm) | 7.3±1.1 | 7.5±1.0 | 7.6±1.0 |
| y size (mm) | 7.1±0.7 | 7.3±0.5 | 6.6±1.3 |
| z size (mm) | 7.2±0.8 | 7.6±0.3 | 7.4±0.8 |
a
This is the CNR for the 4 and 8 mm diameter spheres at the MLEM iteration where the 2 mm diameter spheres attain maximum CNR.