Sometimes, subcostal four-chamber view displays five chambers – aortic bulb may also be visualised. In such a case, the scanning plane is placed across heart base ventrally to atria, and thus, LVOT and aortic bulb are visualised. In some cases, the scanning plane could be placed even more ventrally and structures in front of the aorta – RVOT and the pulmonary artery – could be visualised. In such a case, the Doppler angle between flow in the pulmonary artery and the ultrasound beam is often ideal (= parallel):