Table 2.
SPECT acquisitions of the NEMA/IEC NU2 phantom: Activity concentration in the background (Ac,bg) and spherical inserts (Ac,spheres), total activity deviation (ΔAtot), calibration factor (Bg. cal) and coefficient of variation (COV), lung variability (ΔC lung), and hot contrast (QH) for the 22 mm diameter hot insert.
| NEMA scan number |
A c,bg | A c,spheres | ΔAtot (%) | Bg. cal | COV% | ΔC lung% |
Q
H (%) (22 mm) |
|---|---|---|---|---|---|---|---|
| Scan 1 | 23.27 | 196.87 | 2.5 | 1.06 | 20 | 5.78 | 65 |
| Scan 2 | 18.30 | 154.82 | 1.1 | 1.03 | 24 | 5.70 | 67 |
| Scan 3 | 12.32 | 104.20 | −1 | 0.98 | 28 | 7.79 | 65 |
| Scan 4 | 1.46 | 12.36 | 4 | 1.01 | 55 | 20.47 | 65 |