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Use of a Linear Accelerator for Conducting In Vitro Radiobiology Experiments
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Published on: May 26, 2019

Radio frequency noise from clinical linear accelerators.

B Burke1, M Lamey, S Rathee

  • 1Department of Physics, University of Alberta, 11322-89th Avenue, Edmonton, Alberta, T6G 2G7, Canada. bburke@phys.ualberta.ca

Physics in Medicine and Biology
|April 2, 2009
PubMed
Summary

Radiofrequency (RF) emissions from linear accelerators (linacs) can interfere with magnetic resonance imaging (MRI). Measurements show RF power at MRI frequencies is high enough to cause image artifacts, impacting integrated linac-MRI systems.

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Magnetic Resonance Imaging

Background:

  • Integrated linear accelerator-magnetic resonance (linac-MR) systems are being developed to advance image-guided radiotherapy (IGRT).
  • Understanding radiofrequency (RF) emissions from linear accelerators (linacs) is crucial for designing effective RF shielding to enable successful linac-MR integration.

Purpose of the Study:

  • To measure and estimate the radiofrequency (RF) power spectra emitted by clinical linear accelerators (linacs).
  • To assess the potential impact of these RF emissions on magnetic resonance imaging (MRI) systems within a proposed linac-MR configuration.

Main Methods:

  • RF electric and magnetic field spectra were measured near the treatment couch in three linac vaults using commercial probes.
  • RF power magnitude spectra were estimated.
  • Electric field spectra were measured at various distances from the linac modulator to evaluate spatial variations.

Main Results:

  • A significant portion of RF power is emitted at frequencies below 5 MHz.
  • RF power at the Larmor frequency (8.5 MHz) for a 0.2 T MR system was measured between 0.4-14.6 microW m(-2), sufficient to cause MR image artifacts.
  • Magnetron-based linacs emit substantially more RF power than klystron-based linacs.
  • Electric field measurements showed minimal variation with position in the 1-50 MHz range.

Conclusions:

  • RF emissions from linacs are strong enough to potentially induce artifacts in MRI systems.
  • The findings highlight the need for robust RF shielding in integrated linac-MR systems to ensure image quality.