Table 1:

Results of measurements and dose exposure^{^a}

	Study			Control
	Complete	Subgroups		Complete	Subgroups
	Complete	BMI <27	BMI >27	Complete	70 kV	80 kV	90 kV
No.	45	29	16	45	19	20	6
BMI (kg/m²)	25 ± 4.7	22 ± 2.7	30.4 ± 2	25.9 ± 4.1	23.6 ± 3.5	26.4 ± 3.2	31.4 ± 2.6
Ref. mAs	167	167	167	NA	167	125	104
Eff. mAs	235 ± 52	213 ± 35	274 ± 57^{^b^c}	NA	225 ± 26	200 ± 23	182 ± 16
CTDI_vol (mGy)	2.9 ± 1	2.7 ± 0.4	3.4 ± 0.7^{^b^c}	3.7 ± 1^{^b^d}	2.8 ± 0.3	4.1 ± 0.4^{^b^d}	5.6 ± 0.6^{^b^d}
DLP (mGy × cm)	107 ± 25	95 ± 15	127 ± 28^{^b^c}	133 ± 47^{^b^d}	96 ± 13^{^b^c}	150 ± 41^{^b^d}	200 ± 26^{^b^d}
ED (mSv)	0.56 ± 0.13	0.5 ± 0.08	0.66 ± 0.15	0.70 ± 0.24^{^b^d}	0.50 ± 0.06^{^b^c}	0.78 ± 0.21^{^b^d}	1.04 ± 0.13^{^b^d}
ROI carotid
A (HU)	482 ± 173	496 ± 183	457 ± 155	515 ± 172	644 ± 131^{^b^d}	460 ± 115	287 ± 107^{^b^c}
SD (HU)	10 ± 3	10 ± 4	10 ± 2	11 ± 4^{^b^c}	12 ± 4^{^b^c}	11 ± 3	11 ± 3
C (HU)	419 ± 171	434 ± 183	391 ± 150	456 ± 169	581 ± 128^{^b^d}	407 ± 115	224 ± 105^{^b^c}
SNR	52 ± 25	55 ± 27	47 ± 21	50 ± 30	64 ± 13	45 ± 15	27 ± 12^{^b^c}
CNR	45 ± 24	48 ± 26	40 ± 20	44 ± 28	56 ± 36	40 ± 14	21 ± 10^{^b^c}
CNRD (mGy^−1/2)	26.9 ± 15	29.9 ± 16	22.1 ± 12	22.4 ± 17	29.7 ± 12	19.8 ± 7^{^b^c}	8.8 ± 4^{^b^d}
ROI muscle
A (HU)	63 ± 12	61 ± 12	67 ± 14	69 ± 56	64 ± 13	58 ± 11^{^b^c}	63 ± 4
SD (HU)	8 ± 3	7 ± 3	10 ± 3^{^b^c}	8 ± 3	8 ± 3	8 ± 3	9 ± 3
ROI air
A (HU)	−998 ± 7	−998 ± 5	−998 ± 4	−999 ± 5	−998 ± 5	−1000 ± 5	−1000 ± 6
SD (HU)	4 ± 2	4 ± 1	5 ± 1^{^b^c}	5 ± 1	4 ± 1	4 ± 1	5 ± 1

Note:—No. indicates sample size; ED, effective dose; NA, not applicable; Ref., reference; Eff. mAs, effective mAs; A, relative attenuation.
↵a BMI-related subgroups from the study group are compared with each other; tube voltage–related subgroups of the control group are compared with the study group.
↵b Significant difference.
↵c P < .05.
↵d P < .001.