Table 3.

Volumetric CT chest scanning parameters according to child’s weight when routine and Combiscan protocols are performed

	<15 kg		15–24 kg		25–34 kg		35–44 kg		45–55 kg
	Volume	Combi	Volume	Combi	Volume	Combi	Volume	Combi	Volume	Combi
kVp	100	100	100	100	100	100	100	100	100	100
Effective mAs	20	20	25	25	35	35	55	55	75	75
Collimation (mm)	1.5	0.75	1.5	0.75	1.5	0.75	1.5	0.75	1.5	0.75
Scan slice width (mm)	5	5	5	5	5	5	5	5	8	8
Table feed (mm)	24	12	24	12	24	12	24	12	24	12
Scan time (s)	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
Calculated Effective Dose (mSv)–CT EXPO	0.9	1.0	1.13	1.31	1.58	1.75	2.48	2.75	3.38	3.75