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Figure 1 Examples of two-dimensional planimetry. A, Top row: transthoracic echocardiography (TTE). Bottom row: transesophageal echocardiography (TEE) (NB: two different patients). The valve is seen closed, then maximally open and finally with superimposed planimetry of the valve area. B, Frame by frame planimetry (dotted lines) for one ejection period in moderate aortic stenosis (different patient from top panel). Left, the valve is closed. Progressive opening and closing can be seen in the following frames, returning to complete closure on the right.
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