Assessment of leakage doses around the treatment heads of different linear accelerators

Lonski, P, Taylor, M, Franich, R, Harty, P and Kron, T 2012, 'Assessment of leakage doses around the treatment heads of different linear accelerators', Radiation Protection Dosimetry, vol. 152, no. 4, pp. 1-9.


Document type: Journal Article
Collection: Journal Articles

Title Assessment of leakage doses around the treatment heads of different linear accelerators
Author(s) Lonski, P
Taylor, M
Franich, R
Harty, P
Kron, T
Year 2012
Journal name Radiation Protection Dosimetry
Volume number 152
Issue number 4
Start page 1
End page 9
Total pages 9
Publisher Oxford University Press
Abstract Out-of-field doses to untargeted organs may have long-term detrimental health effects for patients treated with radiotherapy. It has been observed that equivalent treatments delivered to patients with different accelerators may result in significant differences in the out-of-field dose. In this work, the points of leakage dose are identified about the gantry of several treatment units. The origin of the observed higher doses is investigated. LiF:Mg,Cu,P thermoluminescent dosimetry has been employed to quantify the dose at a several points around the linac head of various linear accelerators (linacs): a Varian 600C, Varian 21-iX, Siemens Primus and Elekta Synergy-II. Comparisons are also made between different energy modes, collimator rotations and field sizes. Significant differences in leaked photon doses were identified when comparing the various linac models. The isocentric-waveguide 600C generally exhibits the lowest leakage directed towards the patient. The Siemens and Elekta models generally produce a greater leakage than the Varian models. The leakage 'hotspots' are evident on the gantry section housing the waveguide on the 21-iX. For all machines, there are significant differences in the x and y directions. Larger field sizes result in a greater leakage at the interface plate. There is a greater leakage around the waveguide when operating in a low-energy mode, but a greater leakage for the high-energy mode at the linac face.
Subject Medical Physics
Keyword(s) Linear accelerators
leakage dose
DOI - identifier 10.1093/rpd/ncs049
Copyright notice © The Author 2012. Published by Oxford University Press. All rights reserved.
ISSN 01448420
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