Abdominal CTC “standard-dose” protocol utilized in the prospective trial^*

Protocol:	Supine CTC
Scanner	GE HD 750
Scan Type	Helical
Rotation Time (sec)	0.5
Beam Collimation (mm)	40
Detector Rows	64
Pitch	0.984
Speed (mm/rot)	39.36
Detector Configuration	64 × 0.625
Slice Thickness for NI (mm)	1.25
Scan FOV	Large Body
kV	120
Smart mA Range	30–300
Noise Index	50
Reconstructions (FBP):
DFOV (cm)	36–50
Recon Type	Standard
Window W/L	400/50
Helical Recon Option	Plus
Slice Thickness (mm)	2.5
Interval (mm)	1.5

^*The specific protocol for the accompanying low-dose series was derived by adjusting the noise index (NI)/slice thickness pairing (and mA range) to allow for a targeted 70–90% dose reduction (by DLP) relative to the “standard-dose” series.