• Akshay Goel, Roderick McColl, Kevin S King, Anthony Whittemore, and Ronald M Peshock.
• Department of Radiology, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas, USA.
• J Magn Reson Imaging. 2014 Jul 1;40(1):221-8.

PurposeTo assess if fully automated localization of the aorta can be achieved using phase contrast (PC) MR images.Materials And MethodsPC cardiac-gated MR images were obtained as part of a large population-based study. A fully automated process using the Hough transform was developed to localize the ascending aorta (AAo) and descending aorta (DAo). The study was designed to validate this technique by determining: (i) its performance in localizing the AAo and DAo; (ii) its accuracy in generating AAo flow volume and DAo flow volume; and (iii) its robustness on studies with pathological abnormalities or imaging artifacts.ResultsThe algorithm was applied successfully on 1884 participants. In the randomly selected 50-study validation set, linear regression shows an excellent correlation between the automated (A) and manual (M) methods for AAo flow (r = 0.99) and DAo flow (r = 0.99). Bland-Altman difference analysis demonstrates strong agreement with minimal bias for: AAo flow (mean difference [A-M] = 0.47 ± 2.53 mL), and DAo flow (mean difference [A-M] = 1.74 ± 2.47 mL).ConclusionA robust fully automated tool to localize the aorta and provide flow volume measurements on phase contrast MRI was validated on a large population-based study.© 2013 Wiley Periodicals, Inc.

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