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Figure 1 (A) Location of the predefined quadrants i, ii, iii, and iv relative to the right, left, anterior, and posterior side of the patient. (B) Axial distribution of the four predefined segments (orange), each 2 cm in length, summarizing the wall thickness data beginning 1 cm from the reference cross section, located at the exit of the aortic arch. Segment I is located 1 to 3 cm from reference cross section; segment II is located 3 to 5 cm from reference cross section; segment III is located 5 to 7 cm from reference cross section; and segment IV is located 7 to 9 cm from reference cross section. The location of phase-contrast velocity measurements, in yellow, is positioned in the center of the defined segments. Magnetic resonance imaging slice thickness for the velocity and wall velocity measurements was 5 mm.
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