Table 3.
Overview of the measurement differences between CT and TTE in the assessment of the aortic diameter, depending on the application of the current 2022 and the older ACC/AHA guideline from 2010. The agreement bias represents the average difference between the two applied modalities. The lower and upper tolerance range are calculated by adding and subtracting 1.96 times the standard deviation the agreement bias.
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| MEASUREMENT DIFFERENCES BETWEEN CT AND TTE | ||||
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| GUIDELINE VERSION | 2010 | 2022 | ||
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| SITE | SINUS | ASCENDING AORTA | SINUS | ASCENDING AORTA |
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| Measurement differences outside acceptable tolerance (n, %) | 67 (49%) | 56 (41%) | 35 (26%) | 40 (29%) |
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| Agreement bias (mm) | –2.66 | –1.21 | –0.30 | 1.12 |
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| Standard deviation of bias (mm) | 2.06 | 3.01 | 2.05 | 2.77 |
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| Factor of 1.96 | 1.96 | 1.96 | 1.96 | 1.96 |
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| Lower tolerance range | –6.7 | –7.1 | –4.3 | –4.3 |
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| Upper tolerance range | 1.4 | 4.7 | 3.7 | 6.5 |
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| Total (n) | 137 | 137 | 137 | 137 |
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