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Multi-institutional study of multileaf collimator parameters and dose calculation accuracy using the enhanced leaf

Jun Takatsu1, Tatsuya Inoue2,3, Yohei Utena4

  • 1Department of Radiation Oncology, Juntendo University Graduate School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo, 113-8421, Japan. j-takatsu@juntendo.ac.jp.

Radiological Physics and Technology
|April 11, 2026
PubMed
Summary

This study established optimal multileaf collimator (MLC) parameters for the Enhanced Leaf Model (ELM) on Varian TrueBeam systems. The ELM demonstrated accurate dose calculations for brain stereotactic radiotherapy (SRT), ensuring reliable treatment delivery.

Keywords:
Brain SRS/SRTDosimetric accuracyDosimetric leaf gapEnhanced leaf modelVMAT

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Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • Accurate dose calculation is critical for effective stereotactic radiotherapy (SRT).
  • The Enhanced Leaf Model (ELM) requires precise multileaf collimator (MLC) parameters for Varian TrueBeam systems.
  • Optimizing MLC parameters ensures dosimetric accuracy in complex treatment scenarios.

Purpose of the Study:

  • To determine optimal MLC parameters for the ELM on Varian TrueBeam (120 MLC).
  • To verify the dose calculation accuracy of the ELM in brain SRT.
  • To establish baseline data for institutions implementing the ELM.

Main Methods:

  • A survey of transmission and dosimetric leaf gap (DLG) values was conducted across five institutions.
  • Dosimetric verification was performed for brain SRT using SRS MapCHECK or Gafchromic film.
  • Median values and confidence intervals for transmission and DLG were established for various Varian TrueBeam beam types (6 MV, 10 MV, 6 MV-FFF, 10 MV-FFF).

Main Results:

  • Median gamma passing rates exceeded 95% at a 3%/1 mm criterion for all tested brain SRT targets.
  • Established median transmission and DLG values were confirmed as clinically acceptable.
  • The study provides reliable baseline data for ELM implementation.

Conclusions:

  • The determined MLC parameters are appropriate for the ELM on Varian TrueBeam systems.
  • The ELM demonstrates high accuracy for dose calculations in brain SRT.
  • This research facilitates the clinical implementation of the ELM for improved SRT precision.