Figure 1

Plots of the calculated vs. measured global wall thickness (GT) in mm. GT was measured using the method illustrated in Fig. 7, and was estimated using the derived Eq. (1). Top left: Correlation plot for the derivation subset (n = 269), R² = 0.95, bias 0.00 ± 0.24 mm, identity line shown dashed. Top right: Bland–Altman plot for the derivation subset of the cohort. Solid line shows mean difference and dashed lines show ± 1.96 standard deviations. Bottom left: Correlation plot for the separate validation subset (n = 268), R² = 0.95, p < 0.001, bias 0.01 ± 0.23 mm, identity line shown dashed. Bottom right: Bland–Altman plot for the validation subset of the cohort. Solid line shows mean difference and dashed lines show ± 1.96 standard deviations. GT global wall thickness.