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Related Experiment Video

Updated: Feb 2, 2026

A Rapid Laser Probing Method Facilitates the Non-invasive and Contact-free Determination of Leaf Thermal Properties
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A simple method for determining dosimetric leaf gap with cross-field dose width for rounded leaf-end multileaf

Chih-Yuan Lin1, An-Cheng Shiau2,3,4, Jin-Huei Ji1

  • 1Department of Radiation Oncology, China Medical University Hospital, No.2, Yude Rd., North Dist, Taichung City, 404, Taiwan.

Radiation Oncology (London, England)
|November 15, 2018
PubMed
Summary

A new method simplifies determining the dosimetric leaf gap (DLG) for multileaf collimator (MLC) systems. This approach using cross-field dose width offers a reliable and efficient alternative for treatment planning system commissioning.

Keywords:
Dosimetric leaf gapGAFCHROMIC filmMLCTreatment planning systems

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Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • Accurate modeling of multileaf collimator (MLC) leaf ends is crucial for radiation therapy treatment planning.
  • The dosimetric leaf gap (DLG) and MLC transmission are key parameters for this modeling in systems like Eclipse.
  • Current methods for determining optimal DLG can be time-consuming.

Purpose of the Study:

  • To develop a simple, reliable method for determining the dosimetric leaf gap (DLG).
  • To utilize cross-field dose width for efficient DLG determination.
  • To validate the new method against established techniques.

Main Methods:

  • Measurements using ionization chambers and GAFCHROMIC EBT3 films on a Varian TrueBeam linac.
  • Evaluation of different photon beam energies (6 MV, 10 MV, FFF variants) and depths (5, 10 cm).
  • Derivation of DLGs via linear extrapolation and comparison with film measurements and optimal plan dose values.

Main Results:

  • DLG values showed minimal sensitivity to depth variations.
  • DLGs derived from nominal gap widths differed significantly from cross-field dose width and optimal values.
  • The cross-field dose width method demonstrated good agreement with optimal DLG values (within 0.21 mm).

Conclusions:

  • The cross-field dose width method provides DLG values consistent with film measurements and optimal planning.
  • A straightforward and dependable method for DLG determination in rounded leaf-end MLC systems has been established.
  • This method offers a valuable referable DLG for treatment planning system commissioning.