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Kilovoltage x-ray dosimetry-an experimental comparison between different dosimetry protocols.

Munck af Rosenschöld, Per LU ; Nilsson, Per LU and Knöös, Tommy LU (2008) In Physics in Medicine and Biology 53(16). p.4431-4442
Abstract
Kilovoltage dosimetry protocols by the IAEA (TRS-277 and TRS-398), DIN (6809), IPEMB (with addendum), AAPM (TG-61) and NCS (report 10) were compared experimentally in four clinical beams. The beams had acceleration potentials of 30, 80, 120 and 200 kV, with half-value layers ranging from 0.6 mm Al to 1 mm Cu. Dosimetric measurements were performed and data were collected under reference conditions as stipulated within each separate protocol under investigation. The Monte Carlo method was used to derive backscatter factors for the actual x-ray machine. In general, the agreement of the dosimetric data at the surface of a full-scatter water phantom obtained using the guidelines of the various protocols was fairly good, i.e. within 1-2%.... (More)
Kilovoltage dosimetry protocols by the IAEA (TRS-277 and TRS-398), DIN (6809), IPEMB (with addendum), AAPM (TG-61) and NCS (report 10) were compared experimentally in four clinical beams. The beams had acceleration potentials of 30, 80, 120 and 200 kV, with half-value layers ranging from 0.6 mm Al to 1 mm Cu. Dosimetric measurements were performed and data were collected under reference conditions as stipulated within each separate protocol under investigation. The Monte Carlo method was used to derive backscatter factors for the actual x-ray machine. In general, the agreement of the dosimetric data at the surface of a full-scatter water phantom obtained using the guidelines of the various protocols was fairly good, i.e. within 1-2%. However, the in-air calibration method using the IPEMB and AAPM TG-61 protocols yielded an absorbed dose about 7% lower than the IAEA TRS-398 protocol in the 120 kV beam. By replacing the backscatter factors given in the protocols with Monte Carlo calculated backscatter factors, the convergence between the protocols improved (within 4%). The internal consistency obtained for protocols supporting more than one geometry for dosimetry under reference conditions was better than 0.2% for the DIN protocol (120 kV beam), 2-3% for the AAPM TG-61 (120 and 200 kV beams) and about 2% for the IPEMB protocol (200 kV beam). The present study shows that the current-supported dosimetry protocols in the kilovoltage range were in fairly good agreement, and there were only a few exceptions of clinical significance. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physics in Medicine and Biology
volume
53
issue
16
pages
4431 - 4442
publisher
IOP Publishing
external identifiers
  • wos:000258144300015
  • pmid:18670053
  • scopus:51849167775
ISSN
1361-6560
DOI
10.1088/0031-9155/53/16/014
language
English
LU publication?
yes
id
9da637ca-1f1c-43b9-9e10-62cd1d5c5bd1 (old id 1223619)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/18670053?dopt=Abstract
date added to LUP
2008-09-11 13:26:21
date last changed
2017-01-01 07:38:24
@article{9da637ca-1f1c-43b9-9e10-62cd1d5c5bd1,
  abstract     = {Kilovoltage dosimetry protocols by the IAEA (TRS-277 and TRS-398), DIN (6809), IPEMB (with addendum), AAPM (TG-61) and NCS (report 10) were compared experimentally in four clinical beams. The beams had acceleration potentials of 30, 80, 120 and 200 kV, with half-value layers ranging from 0.6 mm Al to 1 mm Cu. Dosimetric measurements were performed and data were collected under reference conditions as stipulated within each separate protocol under investigation. The Monte Carlo method was used to derive backscatter factors for the actual x-ray machine. In general, the agreement of the dosimetric data at the surface of a full-scatter water phantom obtained using the guidelines of the various protocols was fairly good, i.e. within 1-2%. However, the in-air calibration method using the IPEMB and AAPM TG-61 protocols yielded an absorbed dose about 7% lower than the IAEA TRS-398 protocol in the 120 kV beam. By replacing the backscatter factors given in the protocols with Monte Carlo calculated backscatter factors, the convergence between the protocols improved (within 4%). The internal consistency obtained for protocols supporting more than one geometry for dosimetry under reference conditions was better than 0.2% for the DIN protocol (120 kV beam), 2-3% for the AAPM TG-61 (120 and 200 kV beams) and about 2% for the IPEMB protocol (200 kV beam). The present study shows that the current-supported dosimetry protocols in the kilovoltage range were in fairly good agreement, and there were only a few exceptions of clinical significance.},
  author       = {Munck af Rosenschöld, Per and Nilsson, Per and Knöös, Tommy},
  issn         = {1361-6560},
  language     = {eng},
  number       = {16},
  pages        = {4431--4442},
  publisher    = {IOP Publishing},
  series       = {Physics in Medicine and Biology},
  title        = {Kilovoltage x-ray dosimetry-an experimental comparison between different dosimetry protocols.},
  url          = {http://dx.doi.org/10.1088/0031-9155/53/16/014},
  volume       = {53},
  year         = {2008},
}