Keywords: New Devices, Radiotherapy, Proton TherapyProton beam-induced convection in water triggered local MRI magnitude signal loss in combined imaging and irradiation experiments performed on a new research prototype in-beam low-field MRI proton radiotherapy device. In this study, the influence of convection on the MRI phase signal was tested. Both mechanical and thermal inhibition of convection in dedicated water phantoms resulted in the absence of MRI phase signatures, which were clearly visible under conditions were convection could develop. Moreover, a change in either convection velocity or Venc sequence motion sensitivity changed the observed phase contrast, confirming the convection-driven phase contrast mechanism.
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