Abstract
The effect of a strong external magnetic field on 4 MeV electron beam was measured with polymer gel dosimetry. The measured entrance dose distribution was compared with a calculated fluence map. The magnetic field was created by use of two permanent Neodymium (NdFeB) magnets that were positioned perpendicular to the electron beam. The magnetic field between the magnets was measured with Hall sensors. Based on the magnetic field measurement and the law of Biot-Savart, the magnetic field distribution was extrapolated. Electron trajectories were calculated using a relativistic Lorentz force operator. Although the simplified computational model that was applied, the shape and position of the calculated entrance fluence map are found to be in good agreement with the measured dose distribution in the first layer of the phantom. In combination with the development of low density polymer gel dosimeters, these preliminary results show the potential of 3D gel dosimetry in MRI-linac applications.
Highlights
In recent times, MRI scanners were combined with high energy x-ray treatment devices creating so called MRIGRT [1,2,3]
The effect of a strong external magnetic field on 4 MeV electron beam was measured with polymer gel dosimetry
A preliminary study was set-up to investigate the potential use of polymer gel dosimeters in the presence of a strong magnetic field
Summary
MRI scanners were combined with high energy x-ray treatment devices creating so called MRIGRT [1,2,3]. This combination results in the presence of a strong magnetic field in a region where charged particles are created, affecting the dose distribution inside a patient. A preliminary study was set-up to investigate the potential use of polymer gel dosimeters (both unit density and lung equivalent gel dosimeters [4]) in the presence of a strong magnetic field. A simulation program was developed to predict the charged particles trajectories in vacuum in the presence of an electromagnetic field
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