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Figure 4 Aortic valve stenosis, diastole versus systole, bicuspid versus tricuspid valve: by using retrospective electrocardiogram-gating, split diastolic and systolic multislice computed tomography image reconstruction is feasible. The aortic valve of four patients with aortic stenosis is shown closed during diastole at panels A, C, E, and H (left) and open during systole at panels B, D, F, and G (right) allowing planimetry of aortic valve area (AVA) (tricuspid [A to D] valve in two patients vs. bicuspid [E to H] valve morphology in two patients). Note the characteristic "fish-mouth" feature of bicuspid aortic valve within systole (H). White arrows pointing at valve calcifications; black arrows denote AVA (F). Different post-processing techniques were applied: multiplanar reformation (A to F and H) and slab volume rendering technique (G); LCC = left coronary cusp; R = right coronary ostium; RCC = right coronary cusp.
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