Table 1.

Key parameters and dose metrics for water and anthropomorphic scans

Parameter	100 kVp scan	120 kVp scan	100/140 kVp scan
Rotation time (s)	0.33	0.33	0.33
Reconstruction kernel (SAFIRE strength)	I30f (3)	I30f (3)	I30f (3)
Reconstructed slice thickness/interval (mm)	3/3	3/3	3/3
Reconstructed field of view (mm)	400	400	400
Collimation (slice count × mm)	128 × 0.6	128 × 0.6	128 × 0.6
Pitch	0.55	0.55	0.55
CARE kV setting	3 (non-contrast)	NA	NA
Effective mAs—water phantom	143	89	83/71
CTDIvol—water phantom (mGy)	6.0	6.0	6.0
(Average) effective mAs—anthropomorphic phantom	75	46	42/37
(Average) effective mAs (at axial slice measurement location)—anthropomorphic phantom	71	46	42/38
(Average) CTDIvol—anthropomorphic phantom (mGy)	3.2	3.1	3.1

CTDI_vol, volumetric CT dose index.

CARE kV and SAFIRE; Siemens Healthcare, Forcheim, Germany.