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 First, to study the relationship between TPR20,10 and L̄/ρair (water) for FFF beams, where the flattening filter has been replaced by a metal plate as in most clinical FFF beams.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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4820262
- author
- Dalaryd, Mårten
LU
; Knöös, Tommy
LU
and Ceberg, Crister
LU
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Medical Physics
- volume
- 41
- issue
- 11
- article number
- 111716
- publisher
- John Wiley & Sons Inc.
- 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
- 2025-02-22 02:21:59
@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 = {{John Wiley & Sons Inc.}},
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}},
}