In this study, we proposed a conceptual MRgRT gating strategy using the organ’s motion positional probability volume (PPV) derived from the time-resolved volumetric MRI, aiming to improve treatment accuracy and efficiency. We demonstrated it for the scenario of kidney MRgRT using prospectively acquired CAIPIRINHA-accelerated VIBE MRI data at 1.5T from 7 healthy volunteers. Gating efficiencies of the proposed method were compared to those using the conventional 40%-60% respiratory phase gating. The results showed that the proposed method achieved significantly higher gating efficiency with similar target positional accuracy, indicating its potential value in the future individualized adaptive MRgRT.
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