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Combining tissue-phantom ratios to provide a beam-quality specifier for flattening filter free photon beams.

Dalaryd, Mårten LU ; Knöös, Tommy LU orcid and Ceberg, Crister LU orcid (2014) In Medical Physics 41(11).
Abstract
There are currently several commercially available radiotherapy treatment units without a flattening filter in the beam line. Unflattened photon beams have an energy and lateral fluence distribution that is different from conventional beams and, thus, their attenuation properties differ. As a consequence, for flattening filter free (FFF) beams, the relationship between the beam-quality specifier TPR20,10 and the Spencer-Attix restricted water-to-air mass collision stopping-power ratios, L̄/ρair (water), may have to be refined in order to be used with equivalent accuracy as for beams with a flattening filter. The purpose of this work was twofold. First, to study the relationship between TPR20,10 and L̄/ρair (water) for FFF beams, where the... (More)
There are currently several commercially available radiotherapy treatment units without a flattening filter in the beam line. Unflattened photon beams have an energy and lateral fluence distribution that is different from conventional beams and, thus, their attenuation properties differ. As a consequence, for flattening filter free (FFF) beams, the relationship between the beam-quality specifier TPR20,10 and the Spencer-Attix restricted water-to-air mass collision stopping-power ratios, L̄/ρair (water), may have to be refined in order to be used with equivalent accuracy as for beams with a flattening filter. The purpose of this work was twofold. First, to study the relationship between TPR20,10 and L̄/ρair (water) for FFF beams, where the flattening filter has been replaced by a metal plate as in most clinical FFF beams. Second, to investigate the potential of increasing the accuracy in determining L̄/ρair (water) by adding another beam-quality metric, TPR10,5. The relationship between L̄/ρair (water) and %dd(10)x for beams with and without a flattening filter was also included in this study. (Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Medical Physics
volume
41
issue
11
article number
111716
publisher
American Association of Physicists in Medicine
external identifiers
  • pmid:25370630
  • wos:000344999800018
  • scopus:84908433421
  • pmid:25370630
ISSN
0094-2405
DOI
10.1118/1.4898325
language
English
LU publication?
yes
id
48acbd5d-fab0-4d0b-8da4-28ee8967282e (old id 4820262)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/25370630?dopt=Abstract
date added to LUP
2016-04-01 14:10:40
date last changed
2021-09-22 02:30:50
@article{48acbd5d-fab0-4d0b-8da4-28ee8967282e,
  abstract     = {There are currently several commercially available radiotherapy treatment units without a flattening filter in the beam line. Unflattened photon beams have an energy and lateral fluence distribution that is different from conventional beams and, thus, their attenuation properties differ. As a consequence, for flattening filter free (FFF) beams, the relationship between the beam-quality specifier TPR20,10 and the Spencer-Attix restricted water-to-air mass collision stopping-power ratios, L̄/ρair (water), may have to be refined in order to be used with equivalent accuracy as for beams with a flattening filter. The purpose of this work was twofold. First, to study the relationship between TPR20,10 and L̄/ρair (water) for FFF beams, where the flattening filter has been replaced by a metal plate as in most clinical FFF beams. Second, to investigate the potential of increasing the accuracy in determining L̄/ρair (water) by adding another beam-quality metric, TPR10,5. The relationship between L̄/ρair (water) and %dd(10)x for beams with and without a flattening filter was also included in this study.},
  author       = {Dalaryd, Mårten and Knöös, Tommy and Ceberg, Crister},
  issn         = {0094-2405},
  language     = {eng},
  number       = {11},
  publisher    = {American Association of Physicists in Medicine},
  series       = {Medical Physics},
  title        = {Combining tissue-phantom ratios to provide a beam-quality specifier for flattening filter free photon beams.},
  url          = {https://lup.lub.lu.se/search/files/3828195/5383987.pdf},
  doi          = {10.1118/1.4898325},
  volume       = {41},
  year         = {2014},
}