Table 2 Accuracy of linear phantom measurements.

From: 3D cephalometric analysis using Magnetic Resonance Imaging: validation of accuracy and reproducibility

Phantom Position

Measurement category

Mean difference

(True value − MRI)

95% limits of agreement (True value − MRI)

p-value

1

3D distances (mm)

0.01

−0.41, 0.42

<0.001

2D distances sagittal (mm)

−0.06

−0.59, 0.48

<0.001

2D distances frontal (mm)

−0.01

−0.49, 0.47

<0.001

2D distances horizontal (mm)

0.11

−0.37, 0.59

<0.001

2

3D distances (mm)

0.08

−0.33, 0.49

<0.001

2D distances sagittal (mm)

−0.06

−0.48, 0.36

<0.001

2D distances frontal (mm)

0.03

−0.40, 0.46

<0.001

2D distances horizontal (mm)

0.24

−0.13, 0.61

<0.001

3

3D distances (mm)

−0.12

−0.50, 0.26

<0.001

2D distances sagittal (mm)

0.00

−0.40, 0.41

<0.001

2D distances frontal (mm)

−0.22

−0.46, 0.02

<0.001

2D distances horizontal (mm)

−0.02

−0.48, 0.43

<0.001

  1. All given values refer to 24 different distances per measurement category. p-values < 0.05 indicate equivalence between true values and MRI measurements (two one-sided tests with an equivalence margin of ±0.5 mm).
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