Fig. 2

Slices at valve (a) and ST-junction (b). Flow is quickly measured at the ST-junction because of the round lumen, but turbulence and acceleration makes the flow complex and the slice is above the coronary arteries. At valve level the flow is more laminar, which makes velocity encoding more reliable but because of the shape manual analyses are often necessary. ST sinotubular, RV right ventricle, LA left atrium