Structural design, analysis and testing of 3D water phantom for proton therapy

Abstract

Proton therapy is an advanced radiation therapy technique that allows for precise treatment of the tumor site. 3D water phantom system is the important testing equipment for proton therapy, which can guarantee the dose before treatment, and realize dose distribution scanning detection. It includes a lifting platform, a high-precision three-dimensional servo, ionization chambers, a control system, and a water tank. The lifting platform and high-precision three-dimensional servo are the key factors which can affect the accuracy of proton beam measurement. The 3D water phantom structure design is carried out to realize proton beam dose detection. Finite element analysis model is established to carry out mechanical mechanics analysis of the 3D water phantom structure. During scanning detection, the vibration generated by the servo motor operation may cause the 3D water phantom structure resonance, carry out modal analysis and harmonic response analysis, and calculate the 3D water phantom intrinsic frequency and motor operation vibration frequency within the possible resonance intervals. In addition, the 3D water phantom model was utilized to carry out Bragg peak detection experiments at different energies for proton therapy.