Table 1. Paired t-tests of SNR and CNR between CI/VMI groups and CI/VMI + O-MAR groups.
| SNR and CNR | CI | VMI | |||||
|---|---|---|---|---|---|---|---|
| 50 keV | 70keV | 90 keV | 110 keV | 130 keV | 150 keV | ||
| SNR | |||||||
| CI | 2.44±0.87 | 2.29±1.00 | 2.42±0.81 | 2.55±0.90 | 2.6±0.96 | 2.63±1.00 | 2.64±1.03 |
| O-MAR | 2.82±1.40 | 2.39±1.12 | 2.68±1.17 | 2.88±1.26 | 3.03±1.39 | 3.11±1.47 | 3.15±1.51 |
| P value | 0.003 | 0.541 | 0.022 | 0.008 | <0.001 | <0.001 | <0.001 |
| CNR | |||||||
| CI | 4.33±1.46 | 3.87±1.68 | 4.19±1.42 | 4.41±1.66 | 4.63±1.62 | 4.72±1.67 | 4.76±1.70 |
| O-MAR | 6.16±2.20 | 5.18±2.22 | 5.5±1.98 | 5.76±2.03 | 5.95±2.18 | 6.03±2.26 | 6.06±2.29 |
| P value | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 |
Data represented as mean ± standard deviations. SNR, signal-to-noise ratio; CNR, contrast-to-noise ratio; CI, conventional image; VMI, virtual monochromatic image; O-MAR, orthopedic metal artifact reduction algorithms.