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Table 3 Relative metal artifact reduction in CT values (HU), contrast-to-noise ratio, signal-to-noise ratio and noise in comparison to conventional (140kVp) images without O-MAR

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
Conventional + O-MAR 45% (p = 0.006) 34% (p = 0.002) 33% (p = 0.002) 71% (p = 0.002) 77% (p = 0.012) 36% (p = 0.012) 26% (p = 0.012) 84% (p = 0.012)
130 keV VMI 95% (p = 0.003) 81% (p = 0.001) 58% (p = 0.001) 86% (p = 0.001) 3% (p = 0.779) –69% (p = 0.889) –124% (p = 0.889) 47% (p = 0.012)
130 keV VMI + O-MAR 81% (p = 0.001) 83% (p = 0.001) 66% (p = 0.001) 91% (p = 0.001) 79% (p = 0.012) 46% (p = 0.012) 32% (p = 0.012) 90% (p = 0.012)