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SU-E-T-411: Dosimetric Comparison Between Two Multileaf Collimator Systems for Stereotactic Radiosurgery and

K Asnaashari1,2, J Chow1,2, M Heydarian1,2

  • 1Tehran University of Medical Science, Tehran, Iran.

Medical Physics
|May 19, 2017
PubMed
Summary

This study compared two multileaf collimator (MLC) systems, finding both effective for radiotherapy. The Radionics micro-MLC offers sharper penumbra, while the Elekta Beam Modulator provides a larger field size and greater clearance.

Keywords:
DosimetryField sizeIonization chambersLinear acceleratorsModulatorsMultileaf collimatorsPhotonsRadiation therapyRadiosurgeryTransmission measurement

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Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • Accurate dose delivery in radiotherapy relies on precise beam shaping.
  • Multileaf collimators (MLCs) are critical components for defining radiation fields.
  • Comparing different MLC designs is essential for optimizing treatment planning.

Purpose of the Study:

  • To compare the dosimetric parameters of the Elekta Beam Modulator (BM) and the Radionics micro-MLC (MMLC).
  • Evaluate performance for 6 MV photon beams across various field sizes and depths.

Main Methods:

  • Experimental measurements of percentage depth dose (PDD), beam profiles, penumbra, and MLC leakage.
  • Monte Carlo simulations using BEAMnrc code for dosimetric parameter calculation.
  • Determination of energy fluence spectra using BEAMnrc and BEAMDP.

Main Results:

  • Both MLC systems demonstrated similar PDD, beam profiles, energy fluence spectra, leakage, and transmission.
  • The Radionics MMLC exhibited a sharper penumbra (4.8 mm leaf-side, 5.1 mm leaf-end) compared to the Elekta BM (5.3 mm leaf-side, 6.3 mm leaf-end) at 10 cm depth.
  • MLC leakage was comparable, with maximums of 1.3% for BM and 1.2% for MMLC.

Conclusions:

  • Both the Beam Modulator and micro-MLC are suitable for stereotactic radiosurgery and radiotherapy.
  • The micro-MLC offers superior penumbra sharpness, particularly at the leaf ends.
  • The Beam Modulator provides advantages in larger field size and isocenter clearance.