Measurement methods for positioning accuracy of multileaf collimators in radiation therapy: A mini review-ZENTIME PUBLISHING CORPORATION LIMITED

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Measurement methods for positioning accuracy of multileaf collimators in radiation therapy: A mini review

Yuxi Fang¹, Rongguo Yan¹, Chunying Jiao², Yueling Li², Baolin Liu¹

¹School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China. ²Beijing Institute of Medical Device Testing, Beijing 101111, China.

Address correspondence to: Rongguo Yan, School of Health Science and Engineering, University of Shanghai for Science and Technology, No.334, Jungong Road, Shanghai 200093, China. E-mail: yan rongguo@usst.edu.cn.

Acknowledgement: This work was supported by the National Key Research and Development Program (2022YFC2409502).

DOI: https://doi.org/10.61189/284918qpvynd

Received July 19, 2024; Accepted August 28, 2024; Published March 31, 2025

Highlights

● A comprehensive review of the structure, 3D and 2D views, operational principles, and major manufacturers of multileaf collimators (MLCs) used in radiation therapy.

● Introduction and comparison of three methods for evaluating the positioning accuracy of MLCs: dose film measurement system, Matrixx ionization chamber array, and electronic field imaging system.

Abstract

Radiation therapy is a complex and high-precision technique that requires strict performance criteria for linear accelerators. One of the key factors influencing the quality of radiotherapy is the positioning accuracy of each leaf of the multileaf collimator. This mini-review discusses three commonly used dosimetry-based methods for evaluating multileaf collimator positioning accuracy: the dose film method, the Matrixx ionization chamber array method, and the electronic portal imaging device method. The review highlights the differences between these methods, showing that both the electronic portal imaging device and Matrixx methods offer higher measurement repeatabil ity compared to the dose film method. However, the electronic portal imaging device method is more complex to implement than the Matrixx method.

Keywords: Positioning accuracy, multi leaf collimators, radiation therapy

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