Figure 2 Bland–Altman graphs (A–C) show the limits of agreement and mean absolute differences between planimetric methods: volumetric real‐time three‐dimensional echocardiography (RT3D) and 3D‐guided two‐dimensional imaging (3D/2D) (A), between 3D/2D and planimetry by transoesophageal echocardiography (TEE) (B) and between RT3D and TEE (C). Bland–Altman plots (D–F) show the limits of agreement and mean absolute differences between Doppler‐derived two‐dimensional transthoracic echocardiography (2D‐TTE) and 3D/2D (D); 2D‐TTE and RT3D (E); and 2D‐TTE and TEE (F).