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Abstract #0228

A novel 4D-MRI method enabling real-time image streaming for tumor tracking in radiotherapy

Katrinus Keijnemans1, Pim Borman1, Bas Raaymakers1, and Martin Fast1
1Department of Radiotherapy, University Medical Center Utrecht, Utrecht, Netherlands


In MR-guided abdominothoracic radiotherapy, fast 2D imaging for MLC tracking and respiratory-correlated 4D imaging for dose accumulation is desirable. We developed a hybrid 2D/4D MRI method for pre-beam and beam-on imaging, which continuously acquires and reconstructs T2w coronal simultaneous multi-slice (SMS) images. Pre-beam 4D-MRIs were used to calculate a 3D mid-position reference image. Beam-on SMS data were used to extract real-time motion using a 4D-based motion model, and continuous 4D-MRIs. Dynamic updating of the 4D-motion model yielded the best real-time motion estimation. The presented hybrid 2D/4D MRI method can potentially facilitate novel MR-guided abdominothoracic radiotherapy workflows.

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