The use of a realistic VMAT delivery emulator to optimize dynamic machine parameters for improved treatment efficiency.
Affiliation
North Western Medical Physics, The Christie NHS Foundation Trust, Wilmslow Road, Manchester M20 4BX, UK.Issue Date
2011-07-07
Metadata
Show full item recordAbstract
The delivery of volumetric modulated arc therapy (VMAT) requires the simultaneous movement of the linear accelerator gantry, multi-leaf collimators and jaws while the dose rate is varied. In this study, a VMAT delivery emulator was developed to accurately predict the characteristics of a given treatment plan, incorporating realistic parameters for gantry inertia and the variation in leaf speed with respect to gravity. The emulator was used to assess the impact of dynamic machine parameters on the delivery efficiency, using a set of prostate and head and neck VMAT plans. Initially, assuming a VMAT system with fixed dose rate bins, the allowable leaf and jaw speeds were increased and a significant improvement in treatment time and average dose rate was observed. The software was then adapted to simulate a VMAT system with continuously varying dose rate, and the increase in delivery efficiency was quantified, along with the impact of an increased leaf and jaw speed. Finally, a set of optimal dynamic machine parameters was derived assuming an idealized scenario in which the treatment is delivered in a single arc at constant maximum gantry speed.Citation
The use of a realistic VMAT delivery emulator to optimize dynamic machine parameters for improved treatment efficiency. 2011, 56 (13):4119-33 Phys Med BiolJournal
Physics in Medicine and BiologyDOI
10.1088/0031-9155/56/13/024PubMed ID
21693790Type
ArticleLanguage
enISSN
1361-6560ae974a485f413a2113503eed53cd6c53
10.1088/0031-9155/56/13/024
Scopus Count
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