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. 2015 Feb 17;88(1048):20140601. doi: 10.1259/bjr.20140601

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
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)
p-value <0.001
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)
p-value <0.001
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)
p-value <0.001
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)
p-value <0.001
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)
p-value <0.001

CI, confidence interval; product, conventional sequence; SD, standard deviation; SEMAC, slice encoding for metal artefact correction; VAT, view angle tilting.