Table 1.
Clinical image quality scoring from two readers of 25 whole-body scans based on different criteria, mean (1 SD)
| Scores | Image quality | Liver IQ | Bone marrow IQ | Background tissues except liver/marrow | Noise level | Lesion detectability | Diagnostic confidence |
|---|---|---|---|---|---|---|---|
| Full BSREM | 3.6 (0.81) | 3.4 (0.79) | 3.7 (0.85) | 3.6 (0.84) | 3.5 (0.79) | 4.0 (0.83) | 3.9 (0.88) |
| Full OSEM | 2.7 (0.78) | 2.6 (0.75) | 2.9 (0.87) | 2.7 (0.80 | 2.7 (0.77) | 2.9 (0.72) | 2.9 (0.71) |
| ¾ OSEM | 2.6 (0.67) | 2.6 (0.67) | 2.9 (0.93) | 2.7 (0.77) | 2.6 (0.67) | 2.7 (0.64) | 2.6 (0.64) |
| ½ OSEM | 1.9 (0.70) | 1.8 (0.64) | 2.1 (0.85) | 1.9 (0.77) | 1.8 (0.71) | 1.9 (0.75) | 1.9 (0.75) |
| Full DLE-standard | 4.2 (0.84)a | 4.1 (0.84) | 4.3 (0.78) | 4.2 (0.80) | 4.1 (0.81) | 4.4 (0.76) | 4.4 (0.67) |
| ¾ DLE-standard | 3.9 (0.63)b | 3.8 (0.65) | 4.0 (0.65) | 3.9 (0.63) | 3.9 (0.63) | 3.9 (0.78) | 4.0 (0.71) |
| ½ DLE-standard | 3.3 (0.79)c | 3.4 (0.64) | 3.7 (0.75) | 3.5 (0.65) | 3.4 (0.64) | 3.2 (0.95) | 3.4 (0.92) |
| Weighted kappa | 0.62 | 0.66 | 0.60 | 0.51 | 0.51 | 0.52 | 0.62 |
0 is non-diagnostic, 5 is excellent with no or minimal heterogeneities. Bold indicates the best (highest) score for each metric. Quadratically weighted kappa values between the two readers are given for each metric. The image quality scores from DLE were also tested for significant differences as compared to full BSREM
ap < 0.001, bp = 0.006, cp = 0.11