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Table 3: 
Parameters of the protocols used on the 64-row CT scanner
Parameter Noncontrast Head CT Scan CTP CTA
Infratentorial Supratentorial
Lens protection No Yes Yes
Collimation (mm) 2 × 4 4 × 8 0.5 × 64
Table increment (mm) 8 mm 8 mm None 20.5
Pitch 1 No 0,614
Tube current (mAs_eff) 375 250 50 150
Tube current (mA) 250 50 300
Voltage (kV) 120 120^a 120
Rotation time 1.5 s 1.0 s 1 s 0.5 s
Scan length (mm) 140 32 340.8
Total scan time 24.8 s 45.7 s 23 s
Gantry angulation Yes Yes No
 
a The Aquilion 64 scanner at the Department of Radiology, Charité Campus Mitte (Berlin, Germany) was one of the first scanners of this type installed. Due to a technical limitation, this Aquilion 64 scanner does not support CTP with 80 kV. Newer versions of the Aquilion 64 scanner allow performing CTP with 80 kV in the same way as the Aquilion ONE does.