In this work, the impact of magnetic field presence on the central axis depth-dose curves of helium ion beams inside a heterogeneous phantom with air and bone layers was investigated. According to the calculations, presence of the magnetic field has a considerable impact on the dose distribution of helium beams depending on the field strength and beam energy. A 32.3% abrupt increase and 92.5% reduction in dose were observed at the boundary between the water-air and the water-bone layer insert, respectively. The accuracy of the simulation was evaluated by verifying the depth dose curves of helium ion beams in a water phantom with experimental data.
- The perturbations caused by the presence of a magnetic eld in the dose pro le delivered to the patient is investigated.
- Tissue heterogeneity can cause signi cant variation in the boundary of heterogeneous layers.
- Dose changes depends on the location of heterogeneous layers, thickness and the energy of helium ions.