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Tommy Knöös

Sjukhusfysiker

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Definition of parameters for quality assurance of flattening filter free (FFF) photon beams in radiation therapy

Författare

  • A. Fogliata
  • R. Garcia
  • Tommy Knöös
  • G. Nicolini
  • A. Clivio
  • E. Vanetti
  • C. Khamphan
  • L. Cozzi

Summary, in English

Purpose: Flattening filter free (FFF) beams generated by medical linear accelerators have recently started to be used in radiotherapy clinical practice. Such beams present fundamental differences with respect to the standard filter flattened (FF) beams, making the generally used dosimetric parameters and definitions not always viable. The present study will propose possible definitions and suggestions for some dosimetric parameters for use in quality assurance of FFF beams generated by medical linacs in radiotherapy. Methods: The main characteristics of the photon beams have been analyzed using specific data generated by a Varian TrueBeam linac having both FFF and FF beams of 6 and 10 MV energy, respectively. Results: Definitions for dose profile parameters are suggested starting from the renormalization of the with respect to the corresponding FF beam. From this point the flatness concept has been translated into one of "unflatness" and other definitions have been proposed, maintaining a strict parallelism between FFF and FF parameter concepts. Conclusions: Ideas for quality controls used in establishing a quality assurance program when introducing FFF, beams into the clinical environment are given here, keeping them similar to those used for standard FF beams. By following the suggestions in this report, the authors foresee that the introduction of FFF beams into a clinical radiotherapy environment will be as safe and well controlled as standard beam modalities using the existing guidelines. (C) 2012 American Association of Physicists in Medicine. [http://dx.doi.org/10.1118/1.4754799]

Avdelning/ar

  • Medicinsk strålningsfysik, Lund

Publiceringsår

2012

Språk

Engelska

Sidor

6455-6464

Publikation/Tidskrift/Serie

Medical Physics

Volym

39

Issue

10

Dokumenttyp

Artikel i tidskrift

Förlag

American Association of Physicists in Medicine

Ämne

  • Biophysics

Nyckelord

  • quality assurance
  • flattening filter free beams
  • dosimetric parameter
  • definition

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0094-2405