Appendix Table 2.

Standard dose CT parameters

Parameter	Value
Scanner	GE Discovery CT750 HD
Scan type	Helical
Helical pitch	0.516
Rotation time (s)	0.5
Beam collimation (mm)	40
No. of detector rows	64
Detector configuration	64 × 0.625
Scan field of view	Large body
kV	120
Smart mA min/max mA Range	60–660
Slice thickness for noise index (mm)	5.0
Noise index	16.3
Reconstruction (filtered back projection)
Display field of view (cm)	36–50
Reconstruction type	Standard
Slice thickness (mm)	2.5
Slice interval (mm)	1.25
Window width/level (HU)	400/50
Reconstruction option	Plus