Stability of the Helical TomoTherapy Hi·Art II detector for treatment beam irradiations.

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State: Public
Version: Final published version
Serval ID
serval:BIB_D682E0652258
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Stability of the Helical TomoTherapy Hi·Art II detector for treatment beam irradiations.
Journal
Journal of Applied Clinical Medical Physics / American College of Medical Physics
Author(s)
Schombourg K., Bochud F., Moeckli R.
ISSN
1526-9914 (Electronic)
ISSN-L
1526-9914
Publication state
Published
Issued date
2014
Peer-reviewed
Oui
Volume
15
Number
6
Pages
4897
Language
english
Notes
Publication types: Publication Status: epublish
Abstract
The Hi·Art II Helical TomoTherapy (HT) unit is equipped with a built-in onboard MVCT detector used for patient imaging and beam monitoring. Our aim was to study the detector stability for treatment beam measurements. We studied the MVCT detector response with the 6 MV photon beam over time, throughout short-term (during an irradiation) and long-term (two times 50 days) periods. Our results show a coefficient of variation ≤ 1% for detector chambers inside the beam (excluding beam gradients) for short- and long-term response of the MVCT detector. Larger variations were observed in beam gradients and an influence of the X-ray target where degradation was found. The results assume that an 'air scan' procedure is performed daily to recalibrate the detector with the imaging beam. On short term, the detector response stability is comparable to other devices. Long-term measure- ments during two 50-day periods show a good reproducibility. 
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Web of science
Create date
18/12/2014 18:46
Last modification date
20/08/2019 15:56
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