Figure 2

Left: 3D visualisations of velocities shown at two points in the cardiac cycle. Top images show a short-axis view from a basal position, bottom images show the ventricle viewed from the antero-septum. Arrows show the velocity at each position colour-coded according to speed. Regional variation in velocities can be seen, as can the reversal of velocity directions between peak systole and peak diastole (for example clockwise motion at peak systole and anti-clockwise motion at peak diastole). Right: Velocity-time curves for all slices. Velocities are decomposed into longitudinal, radial and circumferential directions according to a co-ordinate system based on the left ventricle. The line colour corresponds to slice position as shown by the colour bar beneath. Velocities from the most basal slice appear to be affected by image artefacts, possibly due to saturation effects.