RESUMO
A homemade personalized penis holder can provide the reproducibility of the penis during urethra carcinoma (UC) radiotherapy.
RESUMO
PURPOSE: To evaluate beam deflection and dose equivalent perturbation of carbon-ion (C-ion) versus depth in a perpendicular magnetic field with the motivation of application to potential future development of MRI-guided carbon therapy. METHODS: A therapeutic beamline, a rectangular water phantom (homogeneous) and a multi-layer tissue phantom were simulated by applying the FLUKA Monte Carlo simulation code. The C-ion beam deflection variation against depth inside the water phantom at 100, 220 and 310â¯MeV/nucleon (MeV/n) was calculated in the presence of 0.5, 1.5 and 3â¯T magnetic fields. The 220â¯MeV/n primary ion depth dose equivalent variations induced by a 1.5â¯T field were calculated inside the homogeneous and multi-layer phantoms. RESULTS: The calculated deflections were ranging from 0 to 10.5â¯mm. The Bragg depth did not change by applying a 1.5â¯T field to both phantoms under study at 220â¯MeV/n energy. The dose equivalent in the Bragg depth inside the homogeneous and multi-layer tissue phantoms was found to be reduced by 5.1% and 2.95%, respectively. A dose equivalent reduction of 5.77% in the Bragg depth was obtained when an air layer of 1.8â¯cm thick was added to the multi-layer phantom. CONCLUSION: Dose equivalent perturbation and beam deflection become important at energies above 100â¯MeV/n, in both phantoms affected by a 1.5â¯T magnetic field.