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Design and dosimetry characteristics of a soft-docking system for intraoperative radiation therapy

Björk, Peter LU ; Knöös, Tommy LU ; Nilsson, Per LU and Larsson, Kurt (2000) In International Journal of Radiation Oncology, Biology, Physics 47(2). p.527-533
Abstract
PURPOSE: The design concept and the dosimetric characteristics of an applicator system for intraoperative radiation therapy (IORT) with special emphasis on alignment methods, the effect of a plastic scatterer in the beam, radiation leakage, and misalignment dosimetry, are presented in this paper. MATERIALS AND METHODS: A soft-docking system for a linear accelerator, which enables collimation of electron beams (4-22 MeV) for IORT has been developed. The system includes twenty-one circular polymethylmethacrylate (PMMA) treatment cones of different lengths, diameters and end angles. All in-water measurements are made using p-type silicon diode detectors. RESULTS: The effect of introducing a PMMA scatterer in the therapeutic beam includes... (More)
PURPOSE: The design concept and the dosimetric characteristics of an applicator system for intraoperative radiation therapy (IORT) with special emphasis on alignment methods, the effect of a plastic scatterer in the beam, radiation leakage, and misalignment dosimetry, are presented in this paper. MATERIALS AND METHODS: A soft-docking system for a linear accelerator, which enables collimation of electron beams (4-22 MeV) for IORT has been developed. The system includes twenty-one circular polymethylmethacrylate (PMMA) treatment cones of different lengths, diameters and end angles. All in-water measurements are made using p-type silicon diode detectors. RESULTS: The effect of introducing a PMMA scatterer in the therapeutic beam includes increased surface dose values (above 83% for all nominal electron energies and for all cones) and improved dose homogeneity within the therapeutic range. Electrons scattered from the inside wall of the cone result in dose profile horns at depth of dose maximum always lower than 109%. The radiation leakage outside the cone is less than 13%. Large changes in the dose profiles occur if the intraoperative cone is misaligned more than 0.5. CONCLUSION: The alignment procedure of the soft-docking system is easy to handle and the applicator design provides adequate collimation of electron beams for IORT. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Intraoperative radiation therapy, Electron dosimetry, Applicator system, Radiation leakage, Linear accelerator
in
International Journal of Radiation Oncology, Biology, Physics
volume
47
issue
2
pages
527 - 533
publisher
Elsevier
external identifiers
  • pmid:10802382
  • scopus:0343183074
ISSN
0360-3016
DOI
10.1016/S0360-3016(00)00456-9
language
English
LU publication?
yes
id
929c5da6-ba55-472e-aba9-a7d9709a4570 (old id 1116903)
date added to LUP
2008-07-02 11:57:12
date last changed
2017-10-22 03:52:46
@article{929c5da6-ba55-472e-aba9-a7d9709a4570,
  abstract     = {PURPOSE: The design concept and the dosimetric characteristics of an applicator system for intraoperative radiation therapy (IORT) with special emphasis on alignment methods, the effect of a plastic scatterer in the beam, radiation leakage, and misalignment dosimetry, are presented in this paper. MATERIALS AND METHODS: A soft-docking system for a linear accelerator, which enables collimation of electron beams (4-22 MeV) for IORT has been developed. The system includes twenty-one circular polymethylmethacrylate (PMMA) treatment cones of different lengths, diameters and end angles. All in-water measurements are made using p-type silicon diode detectors. RESULTS: The effect of introducing a PMMA scatterer in the therapeutic beam includes increased surface dose values (above 83% for all nominal electron energies and for all cones) and improved dose homogeneity within the therapeutic range. Electrons scattered from the inside wall of the cone result in dose profile horns at depth of dose maximum always lower than 109%. The radiation leakage outside the cone is less than 13%. Large changes in the dose profiles occur if the intraoperative cone is misaligned more than 0.5. CONCLUSION: The alignment procedure of the soft-docking system is easy to handle and the applicator design provides adequate collimation of electron beams for IORT.},
  author       = {Björk, Peter and Knöös, Tommy and Nilsson, Per and Larsson, Kurt},
  issn         = {0360-3016},
  keyword      = {Intraoperative radiation therapy,Electron dosimetry,Applicator system,Radiation leakage,Linear accelerator},
  language     = {eng},
  number       = {2},
  pages        = {527--533},
  publisher    = {Elsevier},
  series       = {International Journal of Radiation Oncology, Biology, Physics},
  title        = {Design and dosimetry characteristics of a soft-docking system for intraoperative radiation therapy},
  url          = {http://dx.doi.org/10.1016/S0360-3016(00)00456-9},
  volume       = {47},
  year         = {2000},
}