Individual iron oxide nanoparticle labelled immune cells can be visualized with a dynamic MRI image series. Time-lapse MRI can provide insights in the studies of inflammatory diseases and metastasis of cancer. The MRI temporal resolution can be improved by undersampling k-space. However, the optimal acceleration factor cannot be easily determined prior to experiments. Strategies have been proposed for non-Cartesian flexible retrospective undersampling, which may not be readily applicable for most users. We propose a Cartesian sampling scheme where undersampling ratio and temporal resolution can be chosen retrospectively.
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