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Table 4 Relative metal artifact reduction in CT values (HU), contrast-to-noise ratio, signal-to-noise ratio and noise in comparison to conventional (140kVp) with O-MAR images

From: Quantitative analysis of metal artifact reduction in total hip arthroplasty using virtual monochromatic imaging and orthopedic metal artifact reduction, a phantom study

  Metal artifact reduction (%) mildly affected pellets Metal artifact reduction (%) severely affected pellets
HU CNR SNR Noise HU CNR SNR Noise
130 keV VMI 92% (p = 0.016) 72% (p = 0.005) 38% (p = 0.033) 51% (p = 0.249) − 331% (p = 0.025) − 166% (p = 0.093) − 202% (p = 0.050) − 223% (p = 0.036)
130 keV VMI + O-MAR 67% (p = 0.001) 74% (p = 0.002) 48% (p = 0.011) 68% (p = 0.033) 6% (p = 0.779) 15% (p = 0.208) 8% (p = 0.208) 39% (p = 0.093)