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Table 5 Correction of 2D measurements using linear regression equations

From: Effects of positioning on radiographic measurements of ankle morphology: a computerized tomography-based simulation study

  

Perturbed pose (3 Deg)

Perturbed pose (6 Deg)

  

Error (%)

Corrected error (%)

Error (%)

Corrected error (%)

Sagittal Plane

Tibia Part

    
 

TiAL

2.17

-1.02

4.41

1.12

 

TiSR

3.17

-0.05

4.87

1.59

 

APG

3.51

-0.14

13.34

9.42

 

APA

2.69

2.69

8.40

8.40

 

MTiTh

2.91

-1.66

5.56

0.25

 

MDA

31.36

8.42

65.25

35.96

 

MDV

25.43

8.63

33.46

12.09

 

Talus Part

    
 

TaAL

-8.57

1.95

-5.92

0.58

 

TaR

7.08

1.10

8.35

1.84

Frontal Plane

Tibia part

    
 

TiW

4.97

-1.85

6.87

-0.23

 

MalW

2.37

0.54

3.54

1.66

 

MLATi

2.21

2.07

2.74

2.60

 

Talus part

    
 

TaW

-10.61

-8.78

-16.36

-14.07

 

MLATa

29.80

14.76

50.54

29.11

  1. *Error = 100% × (2D - 3D)/3D.
  2. Mean residual errors of 2D measurements of the morphological parameters made on two sets of DRR images produced from 3D poses with random errors in the three individual rotational components for up to 3 degrees and 6 degrees, respectively, before and after corrections using the linear regression equations derived from data in the standard pose.
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