Table 2. AI and CTDIvol at Different Tube Voltages (n = 24).

Tube Voltage (kVp)	AI (mean ± SD)		P*	CTDIvol (mGy)
	Non-O-MAR	O-MAR
140	27.03 ± 11.53	13.14 ± 2.97	< 0.001	11.6
120	35.72 ± 20.61	15.97 ± 4.45	0.001	7.9
100	41.35 ± 13.09	20.26 ± 6.31	< 0.001	4.7
80	71.71 ± 46.53	24.49 ± 7.34	< 0.001	2.3

^*Comparison of AI between paired O-MAR and non-O-MAR images. AI = artifact index, CTDIvol = volume CT dose index, O-MAR = orthopedic metal artifact reduction