Table 3.

The averaged mean value of Hounsfield unit in phantom (A = 1, 10, 13), (B = 6, 8, 11, 12) and (C = 5, 7, 9) and in cavity (D = 4, 14, 15, 16, 17, 18, 19), (E = 2, 3) and (F = 20, 21)

Region		No metal	Al non-OMAR	Al OMAR	Ti non-OMAR	Ti OMAR	Zr non-OMAR	Zr OMAR	Cr non-OMAR	Cr OMAR
In phantom	A	142.2	82.0	123.4	154.9	84.1	−23.0	4.8	−52.9	29.5
	B	141.3	131.2	133.7	150.8	138.4	162.6	96.9	218.9	163.9
	C	147.3	137.7	132.3	160.5	151.1	−141.4	48.5	−142.7	85.2
	p-value		0.013	0.112	0.019	0.021	0.085	0.454	0.188	0.281
In cavity	D	−987.5	−969.1	−979.8	−946.8	−970.8	−598.8	−875.3	−454.2	−823.6
	E	−998.9	−995.1	−997.4	−959.4	−984.8	−800.6	−986.1	−703.6	−965.6
	F	−997.0	−949.5	−994.2	−989.4	−998.7	−705.9	−863.4	−534.0	−882.9
	p-value		0.027	0.125	0.008	0.130	<0.0001	<0.0001	<0.0001	<0.0001

Al, with alumina beads; Cr, with chrome beads; non-OMAR, reconstructed image without using orthopaedic metal artefact reduction (OMAR) function; OMAR, reconstructed image using OMAR function; Ti, with titanium beads; Zr, with zirconia beads.

Significant p-values (<0.05) are italicized for emphasis.

The region of interest numbers refer to Figure 1b.