Table 1 Average ROI values taken from an image of the percentage difference between two PET scans. The standard deviation is quoted in brackets for each measurement
From: Practical issues and limitations of brain attenuation correction on a simultaneous PET-MR scanner
ROI position | Diameter × length ROI (mm) | % difference pads on vs pads off | % difference between two sequential scans | % difference with 2 mm downward shift between the PET and CT |
|---|---|---|---|---|
Anterior | 50 × 60 | 1.24 (3.97) | 0.42 (4.03) | 3.05 (7.3) |
Posterior | 50 × 60 | 2.29 (3.74) | 0.34 (4.01) | − 0.01 (5.4) |
Left | 50 × 60 | 1.75 (4.03) | 0.48 (3.86) | 1.31 (5.8) |
Right | 50 × 60 | 1.33 (4.19) | 0.34 (4.01) | 1.32 (5.7) |
Centre | 100 × 60 | 1.8 (4.2) | 0.35 (3.36) | 1.98 (6.05) |