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In vivo determination of the accuracy of field matching in breast cancer irradiation using an electronic portal imaging device

Holmberg, Ola LU ; Huizenga, H; Idzes, M H; Lebesque, J V; Vijlbrief, R E and Mijnheer, B J (1994) In Radiotherapy and Oncology 33(2). p.157-166
Abstract
The purpose of this study was to investigate the accuracy of field matching in patients treated by irradiation of the breast and adjacent lymph nodes. Field matching is performed by the radiographers during each session on a match line drawn on the patient's skin. Field edge positions were assessed in the cranial match plane of tangential breast fields and supraclavicular-axillary fields using an electronic portal imaging device and match line markers placed on the skin of the patients. The mean gap/overlap of the four fields for individual patients during each treatment session, derived from 374 marker projections, was +0.5 mm indicating that no systematic gap or overlap was observed. The uncertainty in the position of the four fields... (More)
The purpose of this study was to investigate the accuracy of field matching in patients treated by irradiation of the breast and adjacent lymph nodes. Field matching is performed by the radiographers during each session on a match line drawn on the patient's skin. Field edge positions were assessed in the cranial match plane of tangential breast fields and supraclavicular-axillary fields using an electronic portal imaging device and match line markers placed on the skin of the patients. The mean gap/overlap of the four fields for individual patients during each treatment session, derived from 374 marker projections, was +0.5 mm indicating that no systematic gap or overlap was observed. The uncertainty in the position of the four fields with respect to the match plane ranges from 3.1 to 5.1 mm (1 SD) for the individual patients. Gaps and overlaps between fields were also related to an absolute match line position, found by comparison of simulator and portal images, showing a small systematic uncertainty of 2.4 mm and a standard deviation of 3.3 mm. It can be concluded that the use of an electronic portal imaging device in combination with match line markers is a good method to quantify the accuracy of field matching in vivo. The results showed good stability and reproducibility in the field matching region for this treatment technique of breast cancer irradiation. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Radiotherapy and Oncology
volume
33
issue
2
pages
157 - 166
publisher
Elsevier
external identifiers
  • scopus:0028587612
ISSN
1879-0887
DOI
10.1016/0167-8140(94)90070-1
language
English
LU publication?
no
id
dfe105a5-b488-491e-9984-e65d4dd37374 (old id 1296323)
date added to LUP
2009-07-31 14:35:49
date last changed
2017-01-01 04:57:31
@article{dfe105a5-b488-491e-9984-e65d4dd37374,
  abstract     = {The purpose of this study was to investigate the accuracy of field matching in patients treated by irradiation of the breast and adjacent lymph nodes. Field matching is performed by the radiographers during each session on a match line drawn on the patient's skin. Field edge positions were assessed in the cranial match plane of tangential breast fields and supraclavicular-axillary fields using an electronic portal imaging device and match line markers placed on the skin of the patients. The mean gap/overlap of the four fields for individual patients during each treatment session, derived from 374 marker projections, was +0.5 mm indicating that no systematic gap or overlap was observed. The uncertainty in the position of the four fields with respect to the match plane ranges from 3.1 to 5.1 mm (1 SD) for the individual patients. Gaps and overlaps between fields were also related to an absolute match line position, found by comparison of simulator and portal images, showing a small systematic uncertainty of 2.4 mm and a standard deviation of 3.3 mm. It can be concluded that the use of an electronic portal imaging device in combination with match line markers is a good method to quantify the accuracy of field matching in vivo. The results showed good stability and reproducibility in the field matching region for this treatment technique of breast cancer irradiation.},
  author       = {Holmberg, Ola and Huizenga, H and Idzes, M H and Lebesque, J V and Vijlbrief, R E and Mijnheer, B J},
  issn         = {1879-0887},
  language     = {eng},
  number       = {2},
  pages        = {157--166},
  publisher    = {Elsevier},
  series       = {Radiotherapy and Oncology},
  title        = {In vivo determination of the accuracy of field matching in breast cancer irradiation using an electronic portal imaging device},
  url          = {http://dx.doi.org/10.1016/0167-8140(94)90070-1},
  volume       = {33},
  year         = {1994},
}