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Fig. 1C —Optimal imaging planes for evaluation of aortic valve shown in 34-year-old man. Cine CT image of aortic valve in axial oblique plane, beginning in end-diastole. Single frame shows appearance of valve leaflets in end-systole (arrows). On dynamic images, which are available online (www.ajronline.org), note opening of valve leaflets with symmetric effacement of aortic valve during systole and complete closure with diastole.