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Figure 2 (A) Linear regression between MR-derived and transesophageal echocardiography (TEE)-derived aortic valve areas (AVAs). There is a good correlation between AVA by magnetic resonance (MR) and that by TEE, as indicated by the proximity of data points. Solid diamonds = actual AVA by MR; open circles = predicted AVA by MR. (B) Linear regression plot between Doppler- and catheter-derived pressure gradients. The data points are less close; however, there is still a good correlation, although less than that between MR and TEE AVAs. Solid diamonds = pressure gradient (DP) by cardiac catheterization (cath); open circles = predicted pressure gradient by cardiac catheterization.