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MDCT interpretation of the ascending aorta with semiautomated measurement software: improved reproducibility compared
Sameer Ahmed1, Stefan L Zimmerman1, Pamela T Johnson1
1The Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins University School of Medicine, 601 N. Caroline Street, JHOC 3142, Box 0818, Baltimore, MD 21287, USA.
Background:
Treatment decisions for ascending aortic aneurysms are guided by measurements from CT angiograms.
Objective:
The aim was to evaluate the reproducibility of these measurements by using manual techniques and advanced imaging software.
Methods:
Two radiologists measured maximal ascending aorta diameter on CT angiograms in 30 subjects at 4 separate reading sessions-2 with manual techniques and 2 with semiautomated software analysis. Interobserver and intraobserver variabilities were assessed with Bland-Altman plots and Spearman correlation coefficients.
Results:
Interobserver variability was smaller for the software-assisted method. Limits of agreement for the manual method were -4.2 mm and 9.2 mm compared with -4.0 mm and 4.6 mm for the software-assisted method; coefficients of repeatability were 6.8 mm and 4.3 mm. Intraobserver variability was inconsistent between readers. Strong correlation was found between observers who used both methods (R(2) = 0.8078-0.9881; P < .05 for all).
Conclusion:
The use of an advanced imaging software for measurement of ascending aortic aneurysm reduces interobserver variability.
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