9 year-old male with Tetralogy of Fallot status post Blalock-Taussig shunt and complete repair with transannular patch at 6 months of age. (A) Snapshot of particle traces in the right atrium during right ventricular diastole reveales two distinct vortices. In addition to the normal clockwise vortex (solid curved arrow), a second vortex in the cephalad aspect of the right atrium was depicted (RA, dashed curved arrow). In (B) normal uniform flow in the RV and pulmonary artery outflow tract can be appreciated in a RV systolic time frame using particle traces visualization (dashed curved arrow). Color-coding was achieved with respect the absolute acquired velocities. SVC = superior vena cava; IVC = inferior vena cava; RPA = right pulmonary artery; LPA = left pulmonary artery.