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Related Experiment Video

Updated: May 22, 2026

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor

Published on: May 7, 2021

Development and validation of a BEAMnrc component module for a miniature multileaf collimator.

E Doerner¹, G H Hartmann

¹Medical Radiation Physics, German Cancer Research Center-DKFZ, Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany. e.doerner@dkfz-heidelberg.de

Physics in Medicine and Biology

|April 28, 2012

Summary

A new mini multileaf collimator (mMLC) component module for BEAMnrc Monte Carlo simulations accurately models the ModuLeaf, showing excellent agreement with measurements for key dosimetric parameters.

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Last Updated: May 22, 2026

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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Published on: March 11, 2021

Area of Science:

Medical Physics
Computational Dosimetry
Radiation Oncology

Background:

Accurate modeling of radiation therapy equipment is crucial for precise dose delivery.
Existing Monte Carlo simulation tools may require enhanced capabilities for novel collimator designs.

Purpose of the Study:

To develop and validate a new component module (CM) for the BEAMnrc Monte Carlo code, simulating the ModuLeaf miniature multileaf collimator (mMLC).
To assess the accuracy of the new mMLC CM in predicting dosimetric parameters for a 6 MV PRIMUS linear accelerator.

Main Methods:

Developed a new mMLC CM within the EGSnrc platform, leveraging the Microsoft Visual Studio environment.
Modeled a PRIMUS linac with the ModuLeaf mMLC.
Validated the CM using ray-tracing for geometric accuracy and by comparing calculated vs. measured output factors, dose profiles, penumbra, and interleaf leakage.

Main Results:

The new mMLC CM demonstrated excellent agreement between calculated and measured dosimetric parameters.
Ray-tracing confirmed the correct geometry of the simulated multileaf collimator.
The CM allows for higher accuracy investigation of leaf position and field edge relationships than direct measurement.

Conclusions:

The developed mMLC CM for BEAMnrc is a validated and useful tool for accurate Monte Carlo simulations of the ModuLeaf system.
This enhanced modeling capability can improve the precision of radiation treatment planning and analysis.