Table 5.
The scoring of qualitative evaluation by readers with the calculation of intraclass correlation coefficient (ICC) for all study data
| Imaging evaluation | 1.5 T product |
1.5 T SEMAC-VAT |
3 T product |
3 T SEMAC-VAT |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rater 1 | Rater 2 | Rater 3 | Rater 1 | Rater 2 | Rater 3 | Rater 1 | Rater 2 | Rater 3 | Rater 1 | Rater 2 | Rater 3 | |
| Artefact size | ||||||||||||
| Mean | 2.50 | 3.25 | 3.25 | 1.00 | 1.00 | 1.25 | 4.00 | 3.75 | 3.75 | 2.50 | 2.00 | 1.75 |
| SD | 0.50 | 0.43 | 0.43 | 0 | 0 | 0.43 | 0 | 0.43 | 0.43 | 0.50 | 0 | 0.43 |
| ICC (95% CI) | 0.95 (0.89–0.98) |
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| p-value | <0.001 |
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| Structure distortion | ||||||||||||
| Mean | 3.25 | 3.25 | 3.25 | 1.25 | 1.00 | 1.25 | 3.75 | 3.75 | 3.75 | 1.75 | 2.00 | 1.75 |
| SD | 0.43 | 0.43 | 0.43 | 0.43 | 0 | 0.43 | 0.43 | 0.43 | 0.43 | 0.43 | 0 | 0.43 |
| ICC (95% CI) | 0.99 (0.97–1.00) |
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| p-value | <0.001 |
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| Imaging blur | ||||||||||||
| Mean | 3.00 | 2.00 | 2.00 | 3.75 | 3.50 | 4.00 | 1.00 | 1.00 | 1.25 | 2.25 | 3.50 | 2.75 |
| SD | 0.71 | 0 | 0.71 | 0.43 | 0.50 | 0 | 0 | 0 | 0.43 | 0.43 | 0.50 | 0.43 |
| ICC (95% CI) | 0.88 (0.73–0.96) |
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| p-value | <0.001 |
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| Visualization ability | ||||||||||||
| Mean | 2.50 | 3.25 | 3.75 | 1.25 | 1.00 | 1.25 | 3.75 | 3.75 | 3.25 | 2.50 | 2.00 | 1.75 |
| SD | 0.87 | 0.43 | 0.43 | 0.43 | 0 | 0.43 | 0.43 | 0.43 | 0.43 | 0.87 | 0 | 0.43 |
| ICC (95% CI) | 0.91 (0.79–0.97) |
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| p-value | <0.001 |
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| Overall image quality | ||||||||||||
| Mean | 2.50 | 3.75 | 4.00 | 1.25 | 1.00 | 2.00 | 3.75 | 3.75 | 3.00 | 2.50 | 2.00 | 1.00 |
| SD | 0.87 | 0.43 | 0 | 0.43 | 0 | 0 | 0.43 | 0.43 | 0 | 0.87 | 0 | 0 |
| ICC (95% CI) | 0.80 (0.53–0.92) |
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| p-value | <0.001 | |||||||||||
CI, confidence interval; product, conventional sequence; SD, standard deviation; SEMAC, slice encoding for metal artefact correction; VAT, view angle tilting.