With MRI being increasingly incorporated in the radiotherapy workflow, the multidisciplinary community has a strong interest in developing “4D-MRI” techniques for both offline (tumor motion characterization for treatment planning) and online (tumor motion tracking) applications. In a cohort of 10 volunteers, the present study applied 2D (coronal) bSSFP with interleaved cylindrical navigators monitoring the liver dome to retrospectively derive 4D-MRI comparing two sorting methods, namely phase and amplitude-probability. Amplitude-probability binning was shown, both qualitatively and quantitatively, to reduce “volume inconsistencies” caused by variable breathing.
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