Passive tracking with the phase-only cross correlation (POCC) algorithm can be used to accurately detect the position of MR-markers for needle procedures. The POCC tracking sequence continuously visualizes the planned needle trajectory during movement, however, image acquisition is interleaved with the measurement of two tracking images which degrades the temporal resolution. Here, it is shown that highly undersampled radial imaging together with the incorporation of the point-spread-function into the POCC algorithm can track the marker at substantially shorter acquisition times. This is an important step to improve the overall temporal resolution and might help to reduce durations of percutaneous procedures.
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