Fig. 2.

Analysis strategy for diameter/flow measurements using 4D flow cardiac magnetic resonance. (A) A typical phase-contrast magnetic resonance angiography (PCMRA) image used for aortic segmentation. (B) After planes were placed along the aortic centerline, sinotubular junction (STJ), mid-ascending aorta (AAo), and distal-AAo were determined. (C) Based on the landmarks specified, planes were divided into three domains and averaged hemodynamics were used to investigate the correlation between hemodynamics and diameters. 4D four dimensional