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Related Experiment Video

Updated: May 20, 2025

A Rapid Laser Probing Method Facilitates the Non-invasive and Contact-free Determination of Leaf Thermal Properties

A Rapid Laser Probing Method Facilitates the Non-invasive and Contact-free Determination of Leaf Thermal Properties

Published on: January 7, 2017

[Measurement for Maximum Leaf Velocity Using Piecewise Linear Approximation under Constant Acceleration of Multileaf

Masato Fujisawa¹, Takahide Hayakawa¹, Masaki Ohkubo¹

¹Department of Radiological Technology, Graduate School of Health Sciences, Niigata University.

Nihon Hoshasen Gijutsu Gakkai Zasshi

|March 25, 2025

Summary

This summary is machine-generated.

A new method accurately measures multileaf collimator (MLC) maximum leaf velocity (Vmax) during dynamic irradiation. This technique confirms the long-term stability of Vmax, crucial for precise radiation therapy delivery.

Keywords:

DMLC IMRT log file maximum leaf velocity multileaf collimator (MLC)

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Published on: May 9, 2014

Area of Science:

Medical Physics
Radiation Oncology
Radiotherapy Technology

Context:

Accurate measurement of multileaf collimator (MLC) performance is essential for ensuring precise radiation delivery in dynamic treatments.
Variations in MLC leaf velocity can impact dose accuracy and treatment efficacy.
Monitoring MLC parameters over time is critical for quality assurance in radiotherapy.

Purpose:

To propose and validate a novel method for determining the maximum leaf velocity (Vmax) of MLCs during dynamic irradiation.
To establish a reliable technique for assessing MLC performance using log file data.
To enable easy confirmation of Vmax stability over extended periods.

Summary:

The study developed a method using log file data and piecewise linear approximation to calculate leaf velocity (v(t)) during dynamic MLC irradiation.
Maximum leaf velocity (Vmax) was determined from the constant velocity segments of the fitted v(t) curve.
Measurements over seven months demonstrated clear distinction of acceleration and velocity segments, yielding Vmax values with low standard deviations (<0.04 cm/s).

Impact:

The proposed method provides an accessible tool for verifying the long-term stability of MLC Vmax.
Consistent Vmax is crucial for maintaining the accuracy and safety of Intensity-Modulated Radiation Therapy (IMRT) and Volumetric Modulated Arc Therapy (VMAT).
This technique supports quality assurance protocols, enhancing the reliability of radiation treatment delivery.