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Table 2: Results of ROI measurements
Group 80 kV 100 kV 120 kV Study Group Complete Control Group (120 kV)
n 18 24 10 53 45
ROI carotid Mean 488.4 ± 93.3^a 340.9 ± 73.8^a 243 ± 83.2^a 372.5 ± 122.1^a 293.9 ± 58
SD 12.7 ± 2.8^a 12.1 ± 2.7^a 7.9 ± 3.1 11.5 ± 3.3^a 8.8 ± 1.8
SNR 40.1 ± 12.3 29.9 ± 9.4 33.7 ± 13 34.1 ± 11.8 35.2 ± 11.7
CNR 34.9 ± 11.5^a 24.4 ± 8.9 25 ± 12.7 28.1 ± 11.5 28.3 ± 10.9
ROI muscle Mean 61.4 ± 7.8 62.2 ± 11.2 61.4 ± 9.8 61.8 ± 9.7 58.9 ± 6.3
SD 9.7 ± 2.7^a 9.6 ± 2.8^a 6.5 ± 2.4 9.1 ± 2.9^a 6.7 ± 1.4
ROI air Mean −1000.2 ± 1.8^a −999.1 ± 2.2 −999.2 ± 1.3 −999.5 ± 2 −998.7 ± 2.2
SD 6.2 ± 1.9^a 6.5 ± 2.2^a 4.1 ± 1.3 5.9 ± 2.1 4.6 ± 1
Note:—Values correspond to Hounsfield units.
↵a P < .05.

Group		80 kV	100 kV	120 kV	Study Group Complete	Control Group (120 kV)
n		18	24	10	53	45
ROI carotid	Mean	488.4 ± 93.3^a	340.9 ± 73.8^a	243 ± 83.2^a	372.5 ± 122.1^a	293.9 ± 58
	SD	12.7 ± 2.8^a	12.1 ± 2.7^a	7.9 ± 3.1	11.5 ± 3.3^a	8.8 ± 1.8
	SNR	40.1 ± 12.3	29.9 ± 9.4	33.7 ± 13	34.1 ± 11.8	35.2 ± 11.7
	CNR	34.9 ± 11.5^a	24.4 ± 8.9	25 ± 12.7	28.1 ± 11.5	28.3 ± 10.9
ROI muscle	Mean	61.4 ± 7.8	62.2 ± 11.2	61.4 ± 9.8	61.8 ± 9.7	58.9 ± 6.3
ROI muscle	SD	9.7 ± 2.7^a	9.6 ± 2.8^a	6.5 ± 2.4	9.1 ± 2.9^a	6.7 ± 1.4
ROI air	Mean	−1000.2 ± 1.8^a	−999.1 ± 2.2	−999.2 ± 1.3	−999.5 ± 2	−998.7 ± 2.2
ROI air	SD	6.2 ± 1.9^a	6.5 ± 2.2^a	4.1 ± 1.3	5.9 ± 2.1	4.6 ± 1