Simulation of a toroidal gantry for proton therapy by fluka

Proton therapy, a rapidly evolving cancer treatment, utilizes high-energy protons to precisely target tumors. This approach minimizes damage to healthy tissue compared to conventional x-ray therapy due to the Bragg Peak phenomenon, where protons deposit most of their energy at a specific depth. This research investigates a novel design for a proton therapy gantry using FLUKA, a powerful software program for simulating particle transport. The study begins by providing a foundational understanding of hadron therapy, encompassing the treatment process, accelerator types, and the beam delivery systems involved. Following this introduction, it delves into the core principles of radiation physics relevant to proton therapy. This includes understanding how photons and charged particles interact with matter, how stopping power influences beam penetration, how dose is calculated to determine treatment effectiveness, and the significance of the Bragg Peak for targeted therapy. The core of the research focuses on simulating a toroidal gantry design for proton therapy using FLUKA. This distinctive gantry design employs a donut-shaped magnetic field to steer the proton beam. The simulation process involves constructions of a detailed geometrical model of the treatment setup, including the toroidal gantry, patient, etc., within FLUKA. Furthermore, the specific parameters of the proton beam, such as energy, initial direction, and intensity, are defined. A critical aspect of the work is the method developed to calculate the multipolar moments of the toroidal magnetic field, which is then integrated into the simulation tool to assess the field's impact on the proton beam. The analysis of the simulation results encompasses several key aspects. First, the calculated magnetic field is compared to the designed field to ensure its accuracy and stability, which are critical for precise beam control. Second, the simulation evaluates how the magnetic field deflects the proton beam and how launch angles need to be adjusted to ensure the beam converges at the precise location within the patient targeted for treatment (isocenter). Furthermore, the simulation calculates the distribution of the deposited dose within the patient and analyzes the LET (Linear Energy Transfer), which describes the amount of energy deposited by the protons per unit track length. This information is crucial for understanding the biological effects of radiation on tumor cells. Finally, the simulation assesses the overall performance of the toroidal gantry design by evaluating factors like energy deposition patterns within the tumor and surrounding tissues. This analysis helps determine the accuracy of beam targeting and the potential for achieving highly conformal dose delivery, minimizing damage to healthy tissue. In conclusion, this research utilized FLUKA software to simulate a novel toroidal gantry design for proton therapy. The study explored the fundamental principles of hadron therapy and radiation physics and analyzed the magnetic field, proton beam deflection, dose distribution, and treatment accuracy within the simulated toroidal gantry. The findings from this research can pave the way for further development and exploration of this innovative design for improved precision and effectiveness in proton therapy. Future research directions could involve exploring the potential clinical applications of the toroidal gantry design and conducting further investigations to optimize its performance for enhanced patient outcomes.