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Figure 1 Slice positioning for planimetry of the aortic valve. (A) Oblique transaxial view of the aortic outflow tract, with the magnetic resonance (MR) slice position indicated by two white lines. (B) Oblique sagittal view of the aortic outflow tract, with the MR slice position indicated by two white lines orthogonal to the stenotic jet. Continued on next page. (C) Cross-sectional view of a moderately stenotic aortic valve; the gray line denotes the aortic valve area (AVA). (D) Cross-sectional view of a severely stenotic aortic valve; the white line denotes the AVA. Ao = ascending aorta; LV = left ventricle.