Fig. 5
From: Cardiovascular imaging approach in pre and postoperative tetralogy of Fallot
CMR flow and volume measurements in repaired TOF used to evaluate PR. a Flow measurements in the main pulmonary artery indicate increased antegrade flow in systole (68.5 ml) with significant retrograde flow in diastole (36.9 ml) also depicted in the upper left flow diagram, calculating a PR fraction of 46%. b Volume measurements of the RV and LV show significantly increased RV stroke volume compared to the LV due to the severe PR. Both flow and planimetry derived RV forward volumes during systole coincide due to absence of significant tricuspid regurgitation