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Which depth dose data should be used for dose planning when wedge filters are used to modify the photon beam?

Knöös, Tommy LU and Wittgren, Lena LU (1991) In Physics in Medicine and Biology 36(2). p.255-267
Abstract
The use of beam data for open photon fields when calculating absorbed dose distributions for beams with wedge filters has been studied. The depth doses for beams with wedge filters are changed through beam hardening and the dose maximum can be shifted; both these changes result in errors in the final dose calculations of several per cent if open beam data are used. The errors are larger for 6 MV than for 18 MV x-rays. The depth of measurement for determining the wedge factor and the influence of other beam modifying devices are discussed. It is recommended that the reference depth be used instead of the dose maximum for these kinds of measurements since the influence of contaminating electrons in the beam will then be avoided and the wedge... (More)
The use of beam data for open photon fields when calculating absorbed dose distributions for beams with wedge filters has been studied. The depth doses for beams with wedge filters are changed through beam hardening and the dose maximum can be shifted; both these changes result in errors in the final dose calculations of several per cent if open beam data are used. The errors are larger for 6 MV than for 18 MV x-rays. The depth of measurement for determining the wedge factor and the influence of other beam modifying devices are discussed. It is recommended that the reference depth be used instead of the dose maximum for these kinds of measurements since the influence of contaminating electrons in the beam will then be avoided and the wedge factor will be correct at a clinically relevant depth. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physics in Medicine and Biology
volume
36
issue
2
pages
255 - 267
publisher
IOP Publishing
external identifiers
  • pmid:1901172
  • scopus:0026025146
ISSN
1361-6560
DOI
10.1088/0031-9155/36/2/009
language
English
LU publication?
yes
id
4f8367c5-5632-4c65-8dec-3a75a1c50021 (old id 1105721)
date added to LUP
2008-08-04 10:17:24
date last changed
2017-07-30 03:44:12
@article{4f8367c5-5632-4c65-8dec-3a75a1c50021,
  abstract     = {The use of beam data for open photon fields when calculating absorbed dose distributions for beams with wedge filters has been studied. The depth doses for beams with wedge filters are changed through beam hardening and the dose maximum can be shifted; both these changes result in errors in the final dose calculations of several per cent if open beam data are used. The errors are larger for 6 MV than for 18 MV x-rays. The depth of measurement for determining the wedge factor and the influence of other beam modifying devices are discussed. It is recommended that the reference depth be used instead of the dose maximum for these kinds of measurements since the influence of contaminating electrons in the beam will then be avoided and the wedge factor will be correct at a clinically relevant depth.},
  author       = {Knöös, Tommy and Wittgren, Lena},
  issn         = {1361-6560},
  language     = {eng},
  number       = {2},
  pages        = {255--267},
  publisher    = {IOP Publishing},
  series       = {Physics in Medicine and Biology},
  title        = {Which depth dose data should be used for dose planning when wedge filters are used to modify the photon beam?},
  url          = {http://dx.doi.org/10.1088/0031-9155/36/2/009},
  volume       = {36},
  year         = {1991},
}