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Illustration of the ultrasound beam direction and its intersection with a hypothetical left ventricle are shown for (a) linear array, (b) phased array geometries. The relationship between Cartesian and polar displacements is shown in (c). Segments based on the AHA criteria are shown in (d): (1) anteroseptal, (2) anterior, (3) anterolateral, (4) inferolateral, (5) inferior, and (6) inferoseptal. AHA = American Heart Association. LV=Left Ventricle; RV= Right Ventricle.
