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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 and Ceberg, Crister LU (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 First, to study the relationship between TPR20,10 and L̄/ρair (water) for FFF beams, where the flattening filter has been replaced by a metal plate as in most clinical FFF beams.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)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Medical Physics
volume
41
issue
11
publisher
American Association of Physicists in Medicine
external identifiers
  • pmid:25370630
  • wos:000344999800018
  • scopus:84908433421
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
2014-12-01 19:01:10
date last changed
2017-10-08 03:59:32
@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.},
  articleno    = {111716},
  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          = {http://dx.doi.org/10.1118/1.4898325},
  volume       = {41},
  year         = {2014},
}