Volumetric Quantification of Localized Normalized Helicity in Patients with Bicuspid Valve and Aortic Dilation

Elevated helical flow in the thoracic aorta may result from hemodynamic and anatomic alterations and valve phenotype. Helical flow is often qualitatively estimated by visual methods. A quantitative approach to assess the degree of helicity can be achieved by the computation of localized normalized helicity (LNH). This study aimed to use the full volume of the 4D flow measured velocity fields to demonstrate that LNH quantification may differentiate helical flow alterations in the aorta between healthy controls and BAV subjects and the correlation of elevated LNH with BAV aortic dilation.

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