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

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.