A phantom for verification of dwell position and time of a high dose rate brachytherapy source

Madebo, M, Pillainayagam, J, Kron, T and Franich, R 2012, 'A phantom for verification of dwell position and time of a high dose rate brachytherapy source', Australasian Physical and Engineering Sciences in Medicine, vol. 35, no. 3, pp. 335-339.


Document type: Journal Article
Collection: Journal Articles

Title A phantom for verification of dwell position and time of a high dose rate brachytherapy source
Author(s) Madebo, M
Pillainayagam, J
Kron, T
Franich, R
Year 2012
Journal name Australasian Physical and Engineering Sciences in Medicine
Volume number 35
Issue number 3
Start page 335
End page 339
Total pages 5
Publisher Springer
Abstract Accuracy of dwell position and reproducibility of dwell time are critical in high dose rate (HDR) brachytherapy. A phantom was designed to verify dwell position and dwell time reproducibility for an Ir-192 HDR stepping source using Computed Radiography (CR). The central part of the phantom, incorporating thin alternating strips of lead and acrylic, was used to measure dwell positions. The outer part of the phantom features recesses containing different absorber materials (lead, aluminium, acrylic and polystyrene foam), and was used for determining reproducibility of dwell times. Dwell position errors of <1 mm were easily detectable using the phantom. The effect of bending a transfer tube was studied with this phantom and no change of clinical significance was observed when varying the curvature of the transfer tube in typical clinical scenarios. Changes of dwell time as low as 0.1 s, the minimum dwell time of the treatment unit, could be detected by choosing dwell times over the four materials that produce identical exposure at the CR detector.
Subject Medical Physics
Keyword(s) Dwell position
dwell time
HDR
phantom
DOI - identifier 10.1007/s13246-012-0138-0
Copyright notice © Australasian College of Physical Scientists and Engineers in Medicine 2012
ISSN 0158-9938
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