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Table 6 Comparison of aortic root diameters between echocardiography and cardiac magnetic resonance

From: 2D cine vs. 3D self-navigated free-breathing high-resolution whole heart cardiovascular magnetic resonance for aortic root measurements in congenital heart disease

TTE vs. 2D cine

CuCo max

CuCu max

TTE vs. 3D self nav

CuCo max

CuCu max

Observer 1

Observer 1

 Mean diameter TTE (mm)

37.2

36.0

   Mean diameter TTE (mm)

37.0

36.0

 Mean diameter 2D cine (mm)

36.6

38.4

   Mean diameter 3D self nav (mm)

37.4

39.9

 Mean difference (mm)

− 0.6

2.3

   Mean difference (mm)

0.4

3.9

 Limits of agreement (mm)

− 7.4 to 6.2

− 4.4 to 9.1

   Limits of agreement (mm)

− 8.0 to 8.7

− 3.5 to 11.3

 Standard deviation (mm)

3.5

3.4

   Standard deviation (mm)

4.2

3.8

 Variance (mm2)

12.1

11.8

   Variance (mm2)

18.0

14.3

 Pearson’s correlation (r)

0.972

0.903

   Pearson’s correlation (r)

0.882

0.881

 P value (t-test)

0.247

 < 0.001

   P value (t-test)

0.564

 < 0.001

Observer 2

Observer 2

 Mean diameter TTE (mm)

36.9

36.6

   Mean diameter TTE (mm)

36.6

36.6

 Mean diameter 2D cine (mm)

36.1

38.4

   Mean diameter 3D self nav (mm)

37.8

39.9

 Mean difference (mm)

− 0.8

1.8

   Mean difference (mm)

1.1

3.4

 Limits of agreement (mm)

− 9.7 to 8.2

− 6.0 to 9.6

   Limits of agreement (mm)

− 5.9 to 8.2

− 3.1 to 9.9

 Standard deviation (mm)

4.6

4.0

   Standard deviation (mm)

3.6

3.3

 Variance (mm2)

20.8

15.9

   Variance (mm2)

12.8

10.9

 Pearson’s correlation (r)

0.881

0.869

   Pearson’s correlation (r)

0.932

0.914

 P value (t-test)

0.532

0.065

   P value (t-test)

0.221

 < 0.001

  1. Of note, the decision on identification of three cusps did not match in 3 cases for observer 1 and in one case for observer 2. As patients without three identified cusps were allocated to the CuCu measurements and for two patients no TTE diameters were available, resulting TTE diameters in Table 6 differ slightly between analyses when using paired t-tests
  2. TTE transthoracic echocardiography, other see Tables 3 and 4