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Table 3: CTDIvols and the lens doses for both axial and helical scans with each CT scanner during whole-brain CT including the orbit
CT Scanner (Number of Detector Rows) Axial Scan Helical Scan
Lens Dose (mGy) CTDIvol (mGy) Lens Dose/CTDIvol Lens Dose (mGy) CTDIvol (mGy) Lens Dose/CTDIvol
Aquilion 64 (64) 103.5 ± 7.2 113.3 ± 0.0 91.4 ± 6.4% 82.3 ± 7.3 96.0 ± 0.0 85.7 ± 7.6%
LightSpeed VCT (64) 81.5 ± 9.8 101.1 ± 0.0 80.6 ± 9.7% 75.4 ± 0.9 74.3 ± 0.0 101.5 ± 1.2%
LightSpeed Ultra 16 (16) 71.5 ± 2.4 85.8 ± 0.0 83.3 ± 2.8% 48.7 ± 0.9 59.6 ± 0.0 81.7 ± 1.5%
LightSpeed Ultra 8 (8) 56.6 ± 0.9 66.5 ± 0.0 85.1 ± 1.3% 45.6 ± 0.7 50.9 ± 0.0 89.7 ± 1.4%
LightSpeed QX/i (4) 70.2 ± 1.5 75.1 ± 0.0 93.5 ± 2.0% 66.7 ± 1.4 65.1 ± 0.0 102.5 ± 2.1%
Brilliance CT 64 (64) 61.7 ± 4.9 72.4 ± 0.0 85.3 ± 6.8% 52.6 ± 0.8 50.9 ± 0.0 103.4 ± 1.6%
MX 8000 IDT (16) 48.1 ± 3.2 51.8 ± 0.0 92.8 ± 6.2% 57.4 ± 1.4 57.0 ± 0.0 100.7 ± 2.4%
Somatom Sensation Cardiac (64) 48.4 ± 1.7 58.9 ± 0.0 82.2 ± 2.8% 42.6 ± 0.9 51.5 ± 0.0 82.8 ± 1.7%