Innovative electromagnetic coupling design and performance testing of a drive module for multi-leaf collimators.

Area of Science:

• Medical Physics
• Radiation Oncology
• Mechanical Engineering

Background:

• Multi-leaf collimators (MLCs) enhance radiotherapy efficiency over traditional blocks.
• High motor count in conventional MLCs leads to increased failure rates and costs.

Purpose of the Study:

• To introduce an innovative electromagnetic coupling drive module for MLCs.
• To reduce the number of motors, thereby lowering failure rates and improving performance.

Main Methods:

• Developed novel single-layer and double-layer MLCs utilizing an electromagnetic coupling drive module.
• Implemented a dual-motor cooperative drive mechanism for synchronized leaf bank control.
• Designed, manufactured, and performance-tested the novel MLCs, including algorithm development and structural optimization for double-layer designs.

Main Results:

• Single-layer MLC achieved a maximum leaf speed of 3 cm/s and 0.23 mm repeat positioning accuracy.
• Optimized double-layer MLC demonstrated improved positioning accuracy within 0.05 mm.
• Average isocentric leaf projection positioning error was 0.06 mm post-MV image calibration.

Conclusions:

• The proposed MLCs with innovative drive modules significantly enhance performance.
• Reduced motor count offers potential for lower failure rates and costs in clinical radiotherapy.
• These advancements are expected to improve treatment efficiency and reduce healthcare expenses.