Table 1. Average CNR at 70 kVp and slope of the trend in CNR at 70 kVp, under the conditions “with” and “without metal” and “with” and “without MAR”.

		Ratio at 70 kVp	Slope at 70 kVp
Metal	MAR	Mean ± SE	Slope ± SE
Without	Without	21.0 ± 1.2	0.49 ± 0.06
	With	22.4 ± 1.2	0.57 ± 0.06
With	Without	13.2 ± 1.2a,b	0.40 ± 0.06
	With	20.7 ± 1.2c	0.48 ± 0.06

CNR, contrast-to-noise ratio; MAR, metal artefact reduction; SE, standard error.

^aSignificantly (p ≤ 0.05) different from without metal and without MAR.

^bSignificantly (p ≤ 0.05) different from without metal and with MAR.

^cSignificantly (p ≤ 0.05) different from with metal and without MAR.