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Improvement of CT Hounsfield number accuracy and noise for a patient with bilateral hip implants after metal artifact reduction. The image display window width is 400 HU, and window level is 800 HU. (a) Before O-MAR correction ROI CT number = −210.4 HU, σ = 115.2 HU. (b) After O-MAR correction ROI CT number = 11.7 HU, σ = 38.7 HU.
