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
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) |