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
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) |