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Related Experiment Videos

Fast, daily linac verification for segmented IMRT using electronic portal imaging.

Sandra C Vieira1, René A Bolt, Maarten L P Dirkx

  • 1Department of Radiation Oncology, Erasmus MC/Daniel den Hoed Cancer Center, Rotterdam, The Netherlands. s.vieira@erasmusmc.nl

Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology
|July 21, 2006
PubMed
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A new quality assurance (QA) method provides fast and accurate daily linac QA for segmented (static) multileaf collimation (SMLC) in intensity modulated radiotherapy (IMRT). This procedure ensures precise leaf positioning and beam output verification.

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Technology

Background:

  • Intensity modulated radiotherapy (IMRT) necessitates rigorous quality assurance (QA) protocols.
  • Existing QA methods for dynamic multileaf collimation (MLC) are fast and accurate.
  • A gap exists for efficient QA of segmented (static) MLC (SMLC).

Purpose of the Study:

  • To develop a rapid and accurate QA procedure for IMRT using SMLC.
  • To adapt existing portal imaging device-based QA methods for SMLC.

Main Methods:

  • Measurements were conducted over 3-8 months on Elekta, Siemens, and Varian linear accelerators (linacs).
  • Image acquisition involved delivering 10 MU segments in SMLC mode, analyzing leaf gap deviations and hysteresis.
  • Beam output and profile at low monitor units (MU) were assessed, with EPID dose measurements compared to ionization chamber readings.

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Main Results:

  • Long-term leaf gap reproducibility was 0.1 mm (Varian) and 0.2 mm (Siemens, Elekta).
  • Hysteresis in leaf positioning was found to be negligible across all tested linacs.
  • EPID and ionization chamber measurements for beam output agreed within 1+/-1% (1SD) down to the lowest MU.

Conclusions:

  • A fast (3-4 min) and accurate QA procedure for daily linac quality control of SMLC has been established.
  • The developed method ensures reliable leaf positioning accuracy and beam output verification for SMLC treatments.
  • This facilitates routine and efficient QA for IMRT delivery using SMLC.