Table 3. Comparison of the means of qualitative (Likert scale) and quantitative (fourier coefficients) image evaluation of NOMAR, DEMAR, IMAR and IMAR+DEMAR at hip prosthesis.
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 | 3.84 ± 0.37 | 3.29 ± 0.71 | 0.0045 | 2.18 ± 0.51 | <0.0001 | 1.87 ± 0.40 | <0.0001 | <0.0001 | 0.0518 |
| Tissue adjacent | 3.89 ± 0.32 | 3.24 ± 0.69 | 0.0005 | 2.16 ± 0.62 | <0.0001 | 1.79 ± 0.51 | <0.0001 | <0.0001 | 0.0559 |
| Tissue distant | 3.34 ± 0.94 | 2.34 ± 0.94 | 0.0018 | 1.03 ± 0.59 | <0.0001 | 0.68 ± 0.65 | <0.0001 | 0.0001 | 0.0709 |
| Quantitative analysis | |||||||||
| Streaks | 137035 ± 101765 | 91991 ± 96934 | <0.0001 | 60558 ± 43022 | <0.0001 | 32359 ± 18567 | <0.0001 | 0.0015 | <0.0001 |
| (-32.87%) | (-55.81%) | (-76.39%) | (-33.17%) | (-46.57%) |
* Comparison of the means vs. NOMAR
**Comparison of the means IMAR vs. DEMAR.
*** Comparison of the means IMAR vs. IMAR+DEMAR