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Table 2: Objective noise at upper neck and shoulder levels, and mean tube current-time product (mAs) in the study and control groups
NI 8 NI 10 Fixed current
Upper neck 7 ± 1.2 HU 6.9 ± 1.2 HU 5.9 ± 2.1 HU
Shoulder 20.6 ± 6.2 HU 21.8 ± 4.5 HU 16.2 ± 6 HU
mAs 186.3 ± 20.5 158.1 ± 21.2 235 ± 21.8
Note:—NI indicates noise index; HU, Housfield units. All measurements are mean ± SD.
	NI 8	NI 10	Fixed current
Upper neck	7 ± 1.2 HU	6.9 ± 1.2 HU	5.9 ± 2.1 HU
Shoulder	20.6 ± 6.2 HU	21.8 ± 4.5 HU	16.2 ± 6 HU
mAs	186.3 ± 20.5	158.1 ± 21.2	235 ± 21.8