Dosimetric characteristics of a new linear accelerator under gated operation

Sergey Kriminski, Alex N. Li, Timothy D. Solberg

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Respiratory gated radiotherapy may allow reduction of the treatment margins, thus sparing healthy tissue and/or allowing dose escalation to the tumor. However, current commissioning and quality assurance of linear accelerators do not include evaluation of gated delivery. The purpose of this study is to test gated photon delivery of a Siemens ONCOR Avant-Garde linear accelerator. Dosimetric characteristics for gated and nongated delivery of 6-MV and 15-MV photons were compared for the range of doses, dose rates, and for several gating regimes. Dose profiles were also compared using Kodak EDR2 and X-Omat V films for 6-MV and 15-MV photons for several dose rates and gating regimes. Results showed that deviation is less than or equal to 0.6% for all dose levels evaluated with the exception of the lowest dose delivered at 25 MU at an unrealistically high gating frequency of 0.5 Hz. At 400 MU, dose profile deviations along the central axes in in-plane and cross-plane directions within 80% of the field size are below 0.7%. No unequivocally detectable dose profile deviation was observed for 50 MU. Based on the comparison with widely accepted standards for conventional delivery, our results indicate that this LINAC is well suited for gated delivery of nondynamic fields.

Original languageEnglish (US)
Pages (from-to)65-76
Number of pages12
JournalJournal of applied clinical medical physics
Volume7
Issue number1
DOIs
StatePublished - 2006

Keywords

  • Dosimetry
  • Kodak EDR2 and X-Omat V films
  • Respiratory gating
  • Siemens ONCOR Avant-Garde

ASJC Scopus subject areas

  • Radiation
  • Instrumentation
  • Radiology Nuclear Medicine and imaging

Fingerprint Dive into the research topics of 'Dosimetric characteristics of a new linear accelerator under gated operation'. Together they form a unique fingerprint.

  • Cite this