Figure 3

Through-plane phase contrast velocity mapping for flow quantification of aortic regurgitation at the valve tips. Left: magnitude (anatomical) images in systole (top) and diastole (bottom). Right: corresponding phase (velocity) images at the same phase; forward flow in white, regurgitant flow in black; dotted line represents region of interest for post-processing of velocity data.

Resulting flow-time graph after integration of velocity in each voxel over one cardiac cycle, demonstrating forward flow above the line and regurgitant flow below the line. The area under the curve represents the volume of flow, and can be calculated by the software.