high-quality images were acquired in three basic cardiac projections : ( 1 ) the long axis of the left ventricle , through the aortic valve and apex , parallel to the interventricular septum , ( 2 ) the long axis of the left ventricle , perpendicular to the septum , and ( 3 ) the short axis of the left ventricle at multiple levels including outflow , papillary muscle , and apex .
C0003501
aortic valve
C0225897
left ventricle