Optimization design of O-ring linear accelerator gantry and mechanical isocenter detection method.

Area of Science:

• Medical Physics
• Mechanical Engineering
• Radiotherapy Technology

Background:

• The accuracy of radiotherapy equipment is crucial for effective cancer treatment.
• The gantry, as a key component of radiotherapy machinery, significantly influences overall equipment precision.
• Existing gantry designs present challenges in weight and inertia, impacting performance.

Purpose of the Study:

• To optimize the O-ring linear accelerator gantry design for enhanced radiotherapy accuracy.
• To reduce the gantry's weight and moment of inertia.
• To develop and validate a precise isocenter measurement method for the optimized gantry.

Main Methods:

• Optimized the layout and structure of the O-ring linear accelerator gantry.
• Reduced gantry weight by 50% and moment of inertia by 60%.
• Developed a laser tracker-based method for rapid and accurate isocenter measurement.

Main Results:

• The optimized gantry achieved a maximum deformation of 0.13 mm under load during rotation.
• The maximum intersection distance between the gantry axis and treatment head axis at the isocenter was 0.21 mm.
• Demonstrated significant improvements in gantry stability and isocenter accuracy.

Conclusions:

• The optimized O-ring linear accelerator gantry design enhances radiotherapy equipment accuracy.
• The proposed laser tracker method provides a reliable approach for isocenter verification.
• These advancements contribute to more precise and effective radiation delivery in cancer therapy.