Highlights
- •Correlation between machine TQA output and patient treatment QA.
- •Energy variation relationship between MVCT and ionisation chamber.
- •Statistical Process Control analysis of treatment beam parameters.
Abstract
The aims of this study were to investigate machine beam parameters using the TomoTherapy
quality assurance (TQA) tool, establish a correlation to patient delivery quality
assurance results and to evaluate the relationship between energy variations detected
using different TQA modules. TQA daily measurement results from two treatment machines
for periods of up to 4 years were acquired. Analyses of beam quality, helical and static output variations
were made. Variations from planned dose were also analysed using Statistical Process
Control (SPC) technique and their relationship to output trends were studied. Energy
variations appeared to be one of the contributing factors to delivery output dose
seen in the analysis. Ion chamber measurements were reliable indicators of energy
and output variations and were linear with patient dose verifications.
Keywords
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Article info
Publication history
Accepted:
May 4,
2017
Received in revised form:
May 4,
2017
Received:
November 28,
2016
Identification
Copyright
Crown Copyright © 2017 Published by Elsevier Ltd on behalf of Associazione Italiana di Fisica Medica. All rights reserved.
