Table 2:

CT/CTA technique

Scan/PhaseTube Potential (kVp)Tube Current (mA)amAseffaRot. Time (sec)Beam Width (mm)PitchScan Length (mm)
Scanner 1
    Head CT
        Head120450450116 × 1.2195
    Head CTA
        Head120450450116 × 1.2156
        Premonitoringb120182600.331 × 1010
        Monitoringb120182600.331 × 1010
        CTA head1203421740.3320 × 0.60.65180
        Delayed head1205854500.520 × 0.60.65171
Scanner 2
    Head CT
        Head1202502860.7532 × 0.50.65160
        Helical1202502860.7532 × 0.50.65160
    Head CTA
        Helical1202502860.7532 × 0.50.65160
        Premonitoringb12050250.54 × 0.52
        Monitoringb12050250.54 × 0.50
        Helical1202501960.564 × 0.50.64160
        Helical1202501960.564 × 0.50.64160

  • Note:—mAseff indicates effective mAs; Rot., rotation.

  • ↵a Tube current and mAseff were variable for Monitoring phase.

  • ↵b Scan over region of chest.