Table 3 Image quality metrics measured by the toolbox before and after harmonization
From: Harmonization of brain PET images in multi-center PET studies using Hoffman phantom scan
Quantification metrics | Non-harmonized Mean ± SD (range) | Harmonized Mean ± SD (range) |
|---|---|---|
COV% | 16.96 ± 6.03 (6–30.55) | 7.88 ± 1.49 (5.49–10.64) |
GMRC | 0.78 ± 0.03 (0.74–0.86) | 0.72 ± 0.01 (0.71–0.75) |
Contrast | 1.82 ± 0.14 (1.55–2.28) | 1.54 ± 0.05 (1.44–1.64) |
GMRC eroded VOI | 0.97 ± 0.03 (0.90–1.04) | 0.94 ± 0.02 (0.89–0.98) |
Contrast eroded VOI | 3.54 ± 0.32 (2.69–4.11) | 3.16 ± 0.04 (2.62–3.53) |
Left–right hemisphere GM RC ratio | 1.02 ± 0.01 (0.99–1.05) | 1.02 ± 0.009 (1.00–1.05) |
Cold-spot RC | 0.04 ± 0.01 (0.01–0.08) | 0.05 ± 0.01 (0.02–0.08) |