The use of a realistic VMAT delivery emulator to optimize dynamic machine parameters for improved treatment efficiency

Christopher Boylan, C. J. Boylan, C. G. Rowbottom, R. I. MacKay

    Research output: Contribution to journalArticlepeer-review

    372 Downloads (Pure)

    Abstract

    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. © 2011 Institute of Physics and Engineering in Medicine.
    Original languageEnglish
    Pages (from-to)4119-4133
    Number of pages14
    JournalPhysics in Medicine and Biology
    Volume56
    Issue number13
    DOIs
    Publication statusPublished - 7 Jul 2011

    Fingerprint

    Dive into the research topics of 'The use of a realistic VMAT delivery emulator to optimize dynamic machine parameters for improved treatment efficiency'. Together they form a unique fingerprint.

    Cite this