Structural shielding design for a gamma ray stereotactic body radiotherapy system

Area of Science:

• Medical Physics
• Radiation Oncology
• Radiotherapy Engineering

Background:

• Stereotactic body radiotherapy (SBRT) utilizes focused radiation for precise tumor treatment.
• Gamma ray-based systems, like the OUR-QGD (body knife), are employed in SBRT.
• Accurate radiation shielding is crucial for patient and staff safety in radiotherapy facilities.

Purpose of the Study:

• To describe the OUR-QGD gamma ray stereotactic body radiotherapy system.
• To calculate the scattered radiation energy distribution within a treatment room.
• To determine the required structural shielding for the treatment room based on radiation protection regulations.

Main Methods:

• Analysis of the OUR-QGD system's structure and gamma radiation focusing principle.
• Computational modeling to determine scattered radiation energy distribution.
• Application of local radiation protection laws to calculate shielding for walls, roof, and doors.

Main Results:

• The energy distribution of scattered radiation was calculated for the treatment room environment.
• Structural shielding requirements for the treatment room (wall, roof, door) were determined.
• The study provides data for ensuring radiation safety in facilities using the OUR-QGD system.

Conclusions:

• The OUR-QGD system's characteristics allow for the calculation of radiation exposure within its treatment room.
• Effective radiation shielding can be designed based on calculated scattered radiation and regulatory standards.
• This work contributes to the safe implementation of gamma ray-based SBRT in China.