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Development and performance evaluation of a high-speed multileaf collimator.

Xiang Zhang1,2, Peiqing Ye1,2,3, Hui Zhang1,2

  • 1Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China.

Journal of Applied Clinical Medical Physics
|March 15, 2017
PubMed
Summary

A new high-speed multileaf collimator (HS-MLC) overcomes limitations of conventional devices. This advanced system accurately tracks fast target motion in radiotherapy, improving treatment precision.

Keywords:
HS‐MLCdosimetric propertiesmechanical propertiesperformance evaluation

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Biomedical Engineering

Background:

  • Conventional multileaf collimators (MLCs) struggle to track fast target motion due to limited leaf speed and acceleration.
  • This limitation hinders effective motion management in radiotherapy, impacting treatment accuracy.
  • A high-speed multileaf collimator (HS-MLC) prototype using linear motors was developed to address this challenge.

Purpose of the Study:

  • To introduce the development of a novel high-speed multileaf collimator (HS-MLC).
  • To evaluate the performance of the HS-MLC through dosimetric, mechanical, and tracking experiments.
  • To assess the feasibility of the HS-MLC for high-accuracy, high-efficiency radiotherapy motion management.

Main Methods:

  • Monte Carlo simulations were used to assess basic dosimetric properties, including radiation leakage and penumbra.
  • Camera-based measurements evaluated mechanical properties such as maximum leaf speed, acceleration, and geometric accuracy.
  • Tracking experiments were conducted using 25 sets of patient-measured motion data, including various breathing patterns.

Main Results:

  • Monte Carlo simulations showed low radiation leakage (average 0.61%) and acceptable penumbra (4.8-5.4 mm).
  • Mechanical evaluations revealed a maximum leaf speed of 40 cm/s, acceleration of 1000 cm/s², and accuracy within 0.5 mm.
  • Tracking experiments achieved a root-mean-square error (RMSE) of less than 0.19 mm for diverse motion patterns.

Conclusions:

  • The developed HS-MLC demonstrates superior mechanical properties, enabling accurate tracking of fast target motion.
  • This technology surpasses the capabilities of conventional MLCs for motion management in radiotherapy.
  • The HS-MLC offers a viable solution for achieving high-accuracy and high-efficiency radiotherapy treatments.