A number of retrospective Cartesian encoding strategies exist for duel gated cardio-respiratory imaging, including freebreathing cine. If respiration and cardiac motion are known prospectively while scanning, is prospective sampling more efficient? To test this we developed an algorithm to prospectively handle variable acquisition durations for each cardio-respiratory bin while acquiring pre-defined Poisson-Disk variable density sampling masks. We compared this to a retrospective spiral profile Cartesian trajectory and found the prospective method had between 10% and 25% higher efficient for matched scan time and had between 20% and 40% higher peak-to-sidelobe ratio of the point-spread-function, which is beneficial for image reconstruction.
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