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  • Title: MDCT interpretation of the ascending aorta with semiautomated measurement software: improved reproducibility compared with manual techniques.
    Author: Ahmed S, Zimmerman SL, Johnson PT, Lai H, Kawamoto S, Horton KM, Fishman EK.
    Journal: J Cardiovasc Comput Tomogr; 2014; 8(2):108-14. PubMed ID: 24568947.
    Abstract:
    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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