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Table 4: 

Parameters of the protocols used on the 320-row CT scanner
ParameterNoncontrast Head CT Scan (Volume)Noncontrast Head CT (Incremental)Combo (Cerebral CTA + CTP)Neck CTA
InfratentorialSupratentorial
Lens protectionNoNoYesYes
Collimation (mm)0.5 × 2802 × 42 × 40.5 × 3200.5 × 64
Table increment (mm)No88none20.5
Pitch11no0.614
Tube current (mAseff)320375250100Tube current modulation
Tube current (mA)320250100Tube current modulation
Voltage (kV)12012080120
Rotation time1 s1.5 s1 s1 s0.5 s
Scan length (mm)140140160216
Scan time7.2 s26.8 s29.8 s30.99 s
Gantry angulationYesYesYesNoNo