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Table 3 Intra-observer variance

From: Non-contrast MR angiography at 1.5 Tesla for aortic monitoring in Marfan patients after aortic root surgery

 

Intra-observer variance

 

Mid-Graft

Distal anastomosis

Ascending aorta

Aortic arch

Descending aorta

Diaphragm

Celiac trunk

 

2D SSFP

Mean difference (mm)

0.22

0.38

0.56

0.14

−0.05

0.29

−0.07

Limits of agreement (mm)

−3.18 to 3.62

−4.39 to 5.14

−3.59 to 4.70

−5.22 to 5.49

−4.21 to 4.10

−6.55 to 7.13

−7.64 to 7.51

Standard deviation (mm)

1.74

2.43

2.11

2.73

2.12

3.49

3.87

Variance (mm2)

3.01

5.92

4.47

7.47

4.50

12.17

14.95

ICC

0.95

0.88

0.94

0.89

0.98

0.96

0.94

 

3D CE-CMRA

Mean difference (mm)

0.03

−0.23

0.17

0.58

0.19

0.33

0.73

Limits of agreement (mm)

−3.60 to 3.66

−5.54 to 5.07

−2.55 to 2.88

−3.82 to 4.97

−4.32 to 4.72

−5.31 to 5.98

−6.69 to 8.16

Standard deviation (mm)

1.85

2.71

1.38

2.24

2.31

2.88

3.79

Variance (mm2)

3.44

7.34

1.92

5.02

5.31

8.29

14.35

ICC

0.92

0.84

0.97

0.93

0.95

0.96

0.92

p-value (t test)

0.491

0.140

0.480

0.367

0.589

0.922

0.869

p-value (F test)

0.605

0.398

0.089

0.133

0.530

0.144

0.870

  1. Intra-observer variance of measured aortic diameters as determined by non-contrast 2D bSSFP imaging and 3D CE-CMRA as described by Bland and Altman. Intraclass correlation coefficients (ICC) are given for both sequence types. Paired t-test was performed for comparison of mean differences and F test for comparison of variances
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Journal of Cardiovascular Magnetic Resonance

ISSN: 1532-429X

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