A new entropic algorithm to measure of the impact of magnetic field on dose distribution: application to MRI-guided radiotherapy*

Purpose - The integration of magnetic resonance imaging, providing an efficient soft-tissue contrast opens real perspective for a better radiotherapy-based treatment. However, the magnetic fields will modify the localization of radiation dose always induced by charged particles. The fast development of these new facilities is one of the recent challenges for the next generation of treatment planning softwares.
Material and methods - Our theoretical physics group proposes a direct resolution of linear Boltzmann transport equation thanks to an angular momentum closure based on the principle of entropy maximization [1,2,3,4]. This algorithm, originally developed for the energetic particle transport in magnetized plasmas, is perfectly suited for modeling dose deposition for MRI-guided radiotherapy [3,4].
Results -We confirm the ability of our entropic closure to take efficiently into account magnetic effects on dose deposition for complex realistic geometries [3,4].
References
[1] B. Dubroca and J.-L. Feugeas, CRAS Paris, Ser. I, t. 329: 915- 920, 1999.
[2] J. Caron et al, Phys. Med. 31, 912, 2015.
[3] J. Page et al, EJMP1016, Phys. Med., 2017
[4] G. Birindelli et al, EJMP1029, Phys. Med., 2017