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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)