Development of a simple control system for uniform proton dose distribution in a dual-ring double scattering method

Area of Science:

• Medical Physics
• Radiation Oncology
• Particle Beam Technology

Background:

• Proton radiotherapy requires highly uniform dose distributions for effective tumor irradiation.
• The dual-ring double scattering method offers superior uniformity compared to wobbler methods.
• Precise alignment of incident proton beams with scatterers is critical for dose uniformity.

Purpose of the Study:

• To develop a control system for optimizing dual-ring double scattering in proton radiotherapy.
• To enhance the uniformity and accuracy of proton beam dose distributions.
• To address the sensitivity of dose uniformity to beam positioning.

Main Methods:

• Development of a control system with automatic fine adjustment of the beam axis.
• Implementation of a mechanism for optimal positioning of the second dual-ring scatterer.
• Evaluation of dose distribution uniformity using the developed control system.

Main Results:

• Achieved highly uniform dose distribution in the irradiation field.
• Dose distribution exhibited symmetry within +/-1%.
• Dose distribution demonstrated flatness within 2%.

Conclusions:

• The developed control system effectively ensures uniform dose distribution in proton radiotherapy.
• Automatic beam axis adjustment and scatterer positioning are key to precise proton beam delivery.
• This system significantly improves the quality of irradiation fields for cancer treatment.