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Figure 4 Linear regression and analysis of agreement between RT3DE, 2DE and EM for LV SV in the animals without LV aneurysms. Open circles = data points from normal sheep; closed circles = data points from sheep with aortic regurgitation. 2DE = two-dimensional echocardiography; EM = electromagnetic flow meter; LV = left ventricle; RT3DE = real-time three-dimensional echocardiography; SV = stroke volume.