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Fig. 6 —Box plot illustrates distribution of central aortic regurgitation area (ARA) measurement values by CT in patients with mild, moderate, and severe aortic regurgitation (grades 1–3, respectively, as shown on x-axis) by transthoracic echocardiography. Note that there was no significant overlap of ARA data between grades 1–3, which indicates promising potential of CT to quantify severity of aortic valve regurgitation based on ARA. Whiskers show ranges of values, shaded boxes mark mean ± 1 SD, thick lines show mean values, and circles indicate extreme values.