Fig. 4

Bland-Altman plots comparing outcomes between T₁ and the 2D HYCE S sequences (a). Plots of the bi-planar translation quantified with the 2D HYCE S sequence (b). a. Plots comparing outcomes using T₁ and the 2D HYCE S sequences. The dashed lines representing the 95 % confidence intervals show that the between-session differences in the measurements obtained with the T₁ and the 2D HYCE S sequences fell within ±1.85 mm (mean/bias = 0.35 mm) for translations (left) and within ±0.95⁰ (mean/bias = 0.02⁰) for all rotations (right) quantified. b. Bland–Altman plots for biplanar translations. The dashed lines representing the 95 % confidence intervals show that the test-retest differences for translations fell within ±1.77 mm (mean/bias = -0.01 mm) and ±1.41 mm (mean/bias = -0.04 mm) for the z- and x-planes, respectively. The central narrow line denotes zero difference mark. The dark line at the center represents the trend line. Homoscedasticity (R² values < 0.1) indicated that the random errors did not increase with an increase in the magnitude of the measured values. Homoscedasticity (R² values < 0.1) indicated that the differences in the measurements did not increase with the increase in the magnitude of the measured displacement. Heteroscedasticity was represented by R² values > 0.1, indicating that the differences in the measurements increased with the increase in the magnitude of the measured displacement