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Four pairs of CT images and dose distribution of the orthopaedic metal artefact reduction (OMAR) phantom with four types of metal beads. For each pair, left side is for non-OMAR image of the phantom with (a) alumina, (c) titanium, (e) zirconia and (g) chrome, and right side is for OMAR image of the phantom with (b) alumina, (d) titanium, (f) zirconia and (h) chrome.
