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Experience from long-term monitoring of RAKR ratios in Ir-192 brachytherapy

Tedgren, Asa Carlsson; Bengtsson, Emil; Hedtjarn, Hakan; Johansson, Asa; Karlsson, Leif; Lamm, Inger-Lena LU ; Lundell, Marie; Mejaddem, Younes; Munck af Rosenschöld, Per LU and Nilsson, Josef, et al. (2008) In Radiotherapy and Oncology 89(2). p.217-221
Abstract
Background: Ratios of values of brachytherapy source strengths, as measured by hospitals and vendors, comprise constant differences as, e.g., systematic errors in ion chamber calibration factors and measurement setup. Such ratios therefore have the potential to reveal the systematic changes in routines or calibration services at either the hospital or the vendor laboratory, which could otherwise be hidden by the uncertainty in the source strength values. Methods: The RAKR of each new source in 13 afterloading units at five hospitals were measured by well-type ion chambers and compared to values for the same source stated on vendor certificates. Results: Differences from unity in the ratios of RAKR values determined by hospitals and vendors... (More)
Background: Ratios of values of brachytherapy source strengths, as measured by hospitals and vendors, comprise constant differences as, e.g., systematic errors in ion chamber calibration factors and measurement setup. Such ratios therefore have the potential to reveal the systematic changes in routines or calibration services at either the hospital or the vendor laboratory, which could otherwise be hidden by the uncertainty in the source strength values. Methods: The RAKR of each new source in 13 afterloading units at five hospitals were measured by well-type ion chambers and compared to values for the same source stated on vendor certificates. Results: Differences from unity in the ratios of RAKR values determined by hospitals and vendors are most often small and stable around their mean values to within +/- 11.5%. Larger deviations are rare but occur. A decreasing ratio, seen at two hospitals for the same source, was useful in detecting an erroneous pressure gauge at the vendor's site. Conclusions: Establishing a mean ratio of RAKR values, as measured at the hospital and supplied on the vendor certificate, and monitoring this as a function of time are an easy way for the early detection of problems with equipment or routines at either the hospital or the vendor site. (c) 2008 Elsevier Ireland Ltd. All rights reserved. Radiotherapy and Oncology 89 (2008) 217-221. (Less)
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Contribution to journal
publication status
published
subject
keywords
Reference air-kerma rate, PDR, Ir-192, HDR
in
Radiotherapy and Oncology
volume
89
issue
2
pages
217 - 221
publisher
Elsevier
external identifiers
  • wos:000261520100013
  • scopus:55349113195
ISSN
1879-0887
DOI
10.1016/j.radonc.2008.07.024
language
English
LU publication?
yes
id
8cb0b51c-b5c6-46ce-8bf5-3f822ca3f170 (old id 1304404)
date added to LUP
2009-03-23 15:05:04
date last changed
2017-01-01 05:19:30
@article{8cb0b51c-b5c6-46ce-8bf5-3f822ca3f170,
  abstract     = {Background: Ratios of values of brachytherapy source strengths, as measured by hospitals and vendors, comprise constant differences as, e.g., systematic errors in ion chamber calibration factors and measurement setup. Such ratios therefore have the potential to reveal the systematic changes in routines or calibration services at either the hospital or the vendor laboratory, which could otherwise be hidden by the uncertainty in the source strength values. Methods: The RAKR of each new source in 13 afterloading units at five hospitals were measured by well-type ion chambers and compared to values for the same source stated on vendor certificates. Results: Differences from unity in the ratios of RAKR values determined by hospitals and vendors are most often small and stable around their mean values to within +/- 11.5%. Larger deviations are rare but occur. A decreasing ratio, seen at two hospitals for the same source, was useful in detecting an erroneous pressure gauge at the vendor's site. Conclusions: Establishing a mean ratio of RAKR values, as measured at the hospital and supplied on the vendor certificate, and monitoring this as a function of time are an easy way for the early detection of problems with equipment or routines at either the hospital or the vendor site. (c) 2008 Elsevier Ireland Ltd. All rights reserved. Radiotherapy and Oncology 89 (2008) 217-221.},
  author       = {Tedgren, Asa Carlsson and Bengtsson, Emil and Hedtjarn, Hakan and Johansson, Asa and Karlsson, Leif and Lamm, Inger-Lena and Lundell, Marie and Mejaddem, Younes and Munck af Rosenschöld, Per and Nilsson, Josef and Wieslander, Elinore and Wolke, Jeanette},
  issn         = {1879-0887},
  keyword      = {Reference air-kerma rate,PDR,Ir-192,HDR},
  language     = {eng},
  number       = {2},
  pages        = {217--221},
  publisher    = {Elsevier},
  series       = {Radiotherapy and Oncology},
  title        = {Experience from long-term monitoring of RAKR ratios in Ir-192 brachytherapy},
  url          = {http://dx.doi.org/10.1016/j.radonc.2008.07.024},
  volume       = {89},
  year         = {2008},
}