Research Masterclass in Radiotherapy Physics 2017

Hybrid system: MRI in a rotating gantry

Brad Oborn et al. Med. Phys 2017

At least one vendor is seriously investigating this possibility

Oliver Jäkel

Medical Physics

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Dose calculation – deflection of primaries B Raaymakers et al., Phys. Med. Biol. 2008 Feasibility of MRI guided proton therapy: magnetic field dose effects ,

90 MeV protons

Air

B=0

B=0.5T

B=3T

CAX dose unchanged!

Wolf and Bortfeld, Phys. Med. Biol. 2012

90MeV beam in B (3T)

• Simple Monte Carlo and numerical studies of proton beam deflection • Deflection is predictable • Deflection is moderate, needs correction • No electron return effect

Air Water

Oliver Jäkel

Medical Physics

Page 20