Table 4.
The results found when analysing the scans of only the patients having a foreign body. The scores did not show any significant differences in the observer preferences than those found for the entire case set
| Hybrid-IR | MBIR | DLR | DLR vs. Hybrid-IR | DLR vs. MBIR | ||
|---|---|---|---|---|---|---|
| Perceived ratings | ||||||
| Noise | 2.87 [2.71–3.04] | 2.50 [2.34–2.66] | 3.26 [3.09–3.42] | p = 0.001 | p < 0.001 | |
| Sharpness | 3.13 [2.95–3.30] | 2.53 [2.35–2.70] | 3.17 [3.00–3.35] | p = 0.733 | p < 0.001 | |
| Natural appearance | 3.23 [3.06–3.40] | 2.57 [2.40–2.74] | 3.23 [3.06–3.40] | p = 1.000 | p < 0.001 | |
| Grey-white matter differentiation | 2.94 [2.76–3.13] | 2.57 [2.38–2.76] | 3.33 [3.14–3.52] | p = 0.005 | p < 0.001 | |
| Artefacts | 2.86 [2.68–3.03] | 2.50 [2.32–2.68] | 2.81 [2.64–2.99] | p = 0.734 | p = 0.013 | |
| Overall perceived image quality | 3.13 [2.95–3.30] | 2.53 [2.35–2.70] | 3.31 [3.14–3.49] | p = 0.141 | p < 0.001 | |
| Quantitative analysis | ||||||
| Standard deviation in lateral ventricle | 6.6 ± 1.1 | 6.4 ± 0.8 | 5.7 ± 1.2 | p < 0.001 | p = 0.02 | |
| Signal-difference-to-noise-ratio | 1.8 ± 0.4 | 1.9 ± 0.5 | 2.4 ± 0.7 | p < 0.001 | p = 0.01 | |
| Standard deviation in fourth ventricle* | 6.2 ± 0.3 | 6.3 ± 1.4 | 5.1 ± 0.9 | p = 0.01 | p = 0.02 | |
*Two patients were excluded from these measurements as the fourth ventricle was filled with blood