Table 4. Comparison of the means of qualitative (Likert scale) and quantitative (fourier coefficients) image evaluation of NOMAR, DEMAR, IMAR and IMAR+DEMAR at dental implants.
NOMAR = no metal artifact reduction, DEMAR = Dual-energy metal artifact reduction, IMAR = iterative metal artifact reduction, IMAR+DEMAR = combination of IMAR and DEMAR, p = p value, n.s. = non-significant.
| NOMAR | DEMAR | p* | IMAR | p* | IMAR+DEMAR | p* | p** | p*** | |
|---|---|---|---|---|---|---|---|---|---|
| Qualitative analysis | |||||||||
| Artifact | 3.89 ± 0.44 | 3.66 ± 0.60 | 0.0309 | 2.60 ± 0.60 | <0.0001 | 2.33 ± 0.52 | <0.0001 | <0.0001 | 0.0880 |
| Tissue adjacent | 3.89 ± 0.36 | 3.54 ± 0.78 | 0.0301 | 2.73 ± 0.46 | <0.0001 | 2.39 ± 0.57 | <0.0001 | <0.0001 | 0.0158 |
| Tissue distant | 2.87 ± 0.97 | 2.50 ± 0.96 | 0.0892 | 1.42 ± 0.56 | <0.0001 | 0.81 ± 0.63 | <0.0001 | 0.0001 | 0.0004 |
| Quantitative analysis | |||||||||
| Streaks | 255720 ± 148377 | 234076 ± 150932 | 0.106 | 73877 ± 37441 | <0.0001 | 60455 ± 29116 | <0.0001 | 0.0014 | <0.0001 |
| (-8.46%) | (-71.11%) | (-76.36%) | (-68.44%) | (-18.17%) |
* Comparison of the means vs. NOMAR
**Comparison of the means IMAR vs. DEMAR.
*** Comparison of the means IMAR vs. IMAR+DEMAR