Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

Proton 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.