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Gating characteristics of an Elekta radiotherapy treatment unit measured with three types of detector.

Evans, PM, Symonds-Tayler, JR, Colgan, R, Hugo, GD, Letts, N and Sandin, C (2010) Gating characteristics of an Elekta radiotherapy treatment unit measured with three types of detector. Phys Med Biol, 55 (8). N201-N210.

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The characteristics of an Elekta Precise treatment machine with a gating interface were investigated. Three detectors were used: a Farmer ionization chamber, a MatriXX ionization chamber array and an in-house, single pulse-measurement ionization chamber (IVC). Measurements were made of dosimetric accuracy, flatness and symmetry characteristics and duty cycle for a range of beam-on times and gating periods. Results were compared with a standard ungated delivery as a reference. For all beam-on times, down to 0.5 s, dosimetric differences were below +/-1% and flatness and symmetry parameter variations were below +/-1.5%. For the shorter beam-on times the in-house detector deviated from the other two detectors, suggesting that this device should be used in conjunction with other detectors for absolute dosimetry purposes. However, it was found to be useful for studying gated beam characteristics pulse by pulse.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Vision Speech and Signal Processing
Authors :
Evans, PM
Symonds-Tayler, JR
Colgan, R
Hugo, GD
Letts, N
Sandin, C
Date : 21 April 2010
DOI : 10.1088/0031-9155/55/8/N02
Uncontrolled Keywords : Four-Dimensional Computed Tomography, Humans, Movement, Radiometry, Radiotherapy, Radiotherapy Dosage, Radiotherapy Planning, Computer-Assisted, Respiration
Additional Information : Copyright 2010 Institute of Physics. This is the author's accepted manuscript.
Depositing User : Symplectic Elements
Date Deposited : 05 Feb 2013 11:26
Last Modified : 31 Oct 2017 14:52

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