Table 2.
Interobserver variance of the measured aortic diameters obtained by 3D-Dixon and 2D-SSFP MR-imaging as described by Bland and Altman
| Interobserver variance | |||||
|---|---|---|---|---|---|
| Sinuses of Valsalva | Sinutubular junction | Ascending aorta | Mid aortic arch | Descending aorta | |
| 3D-Dixon | |||||
| Mean difference (mm) | 0.53 | 0.57 | 1.00 | 0.40 | 0.15 |
| Limit of agreements (mm) | −2.81 to 3.87 | −1.97 to 3.11 | −2.19 to 4.19 | −2.33 to 3.14 | −3.04 to 3.34 |
| Standard deviation (mm) | 1.70 | 1.30 | 1.63 | 1.39 | 1.63 |
| Variance (mm2) | 2.91 | 1.69 | 2.65 | 1.94 | 2.65 |
| Intraclass correlation coefficient (r) | 0.98 | 0.98 | 0.98 | 0.94 | 0.94 |
| 2D-SSFP | |||||
| Mean difference (mm) | 0.38 | 0.13 | 0.87 | −0.04 | 0.47 |
| Limit of agreements (mm) | − 2.09 to 2.85 | −2.92 to 3.18 | 2.20 to 3.95 | −2.81 to 2.73 | −2.59 to 3.52 |
| Standard deviation (mm) | 1.26 | 1.56 | 1.57 | 1.41 | 1.56 |
| Variance (mm2) | 1.59 | 2.42 | 2.46 | 2.00 | 2.43 |
| Intraclass correlation coefficient (r) | 0.99 | 0.98 | 0.98 | 0.95 | 0.95 |
| p value (t test) | 0.55 | 0.88 | 0.66 | 0.15 | 0.21 |
| p value (F test) | 0.02 | 0.11 | 0.40 | 0.46 | 0.38 |
T-test was performed for comparison of mean differences and F-test for comparison of variances. Significant differences are in boldface (significant at p < 0.05)