Real-time two-dimensional echocardiographic images of a patient with a normal heart. A. Parasternal long-axis view. There is symmetric contraction of the ventricles, evidenced by a decrease in cavity size and increase in wall thickness during systole. Echocardiographic imaging is performed in multiple acoustic windows with different transducer rotations so that the entire heart and great vessels can be displayed in various planes. Most information from a study is obtained from visual analysis of the two-dimensional images, although objective measurements of cardiac dimensions can be made.