Figure 2

Pathlines generated from the data using both the conventional Cartesian technique and the spiral technique. The pathlines were traced backwards starting from the descending aorta, in order to avoid sensitivity to branching flow. Wall clock scan times (including the navigator efficiency) are indicated for this volunteer. Pathlines that leave the geometrical boundaries of the aorta (yellow) are detected and used as a measure for data fidelity to compare the two methods.