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Table 2 Absolute and relative HU deviation in the scan with large head MoM THA prosthesis scans with and without O-MAR with filter A and iDose⁴ level 5 compared to baseline for pellets L0, L5, L6 and L8

From: Quantitative analysis of orthopedic metal artefact reduction in 64-slice computed tomography scans in large head metal-on-metal total hip replacement, a phantom study

Scan protocol	Pellet	Δ \|HU\|	Δ HU %	Δ \|HU\|	Δ \|HU\|
Scan protocol	Pellet	O-MAR off	O-MAR off (%)	O-MAR on	% O-MAR on (%)
120 kVp, 150 mAs	L0	0	0	0	0
	L5	102	41	52	21
	L6	291	111	101	38
	L8	795	306	538	207
120 kVp, 600 mAs	L0	0	0	0	0
	L5	79	30	57	22
	L6	238	93	82	32
	L8	766	297	517	200
140 kVp, 101 mAs	L0	6	3	6	3
	L5	115	47	70	28
	L6	276	118	81	35
	L8	796	337	531	225
140 kVp, 405 mAs	L0	0	0	13	5
	L5	94	39	57	24
	L6	271	113	83	34
	L8	799	341	517	219

Significant positive effect of OMAR (p < 0.001) for pellet L5, L6 and L6 regarding absolute and percentage of change in HU values caused by metal artefacts

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