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Table 2:  Scanning parameters for both axial and helical scans with each CT scanner
CT Scanner (number of detector rows) Axial Scan Helical Scan
Collimation (mm) Rotation Time (sec) mAs Collimation (mm) Rotation Time (sec) mAs_eff Helical Pitch
Aquilion 64 (64), Toshiba Medical Systems, Tokyo, Japan 8 × 0.5 1 350 64 × 0.5 1 300 0.641
LightSpeed VCT (64), GE Healthcare, Milwaukee, Wisconsin 16 × 0.625 2 420 32 × 0.625 1 433 0.531
LightSpeed Ultra 16 (16), GE Healthcare 8 × 1.25 2 400 16 × 0.625 0.7 261 0.938
LightSpeed Ultra 8 (8), GE Healthcare 4 × 3.75 2 360 8 × 1.25 0.8 256 0.625
LightSpeed QX/i (4), GE Healthcare 4 × 2.5 2 400 4 × 2.5 0.7 326 0.75
Brilliance CT 64 (64), Philips Medical Systems, Best, the Netherlands 16 × 0.625 1.5 450 64 × 0.625 0.5 450 0.423
MX 8000 IDT (16), Philips Medical Systems, 16 × 1.5 1.5 400 16 × 0.75 0.75 400 0.5
Somatom Sensation Cardiac 64 (64), Siemens, Malvern, Pennsylvania 12 × 1.2 2 380 20 × 0.6 1 422 0.9