Parasternal short axis view through the base of the heart with color flow Doppler imaging

The parasternal short axis view is recorded from the base of the heart. Color flow Doppler imaging during systole (panel A) demonstrates normal systolic flow from the right ventricular outflow tract (RVOT) to the main pulmonary artery (MPA). The flow signal is red in the proximal RVOT as it travels towards the transducer. As it moves at right angles to the interrogating beam, the signal briefly disappears. When the flow turns away from the transducer and exits into the MPA, it is coded blue. Imaging from short axis view through the base of the heart during diastole (panel B) shows diastolic flow signal (red) from pulmonic valve (PV) denoting trivial pulmonic regurgitation (PR) which is found in 90 percent of normals.