The acoustic papillae sound barrier in echocardiography
The technique of the acoustic papillae sound barrier in echocardiography
The four-chamber image from the apex shows the papillary muscle shadow. Above: Image recorded during diastole. Note the position of the papillary muscle (black arrow) and the shading behind it. Also, note the actual positions and thicknesses of the side walls (white arrows). Below: The image was recorded during systole and shows more magnified papillary muscle shadow. Mistaking the ball of the papillary muscle for the lateral wall would result in a significant underestimation of the size of the left ventricle.