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Related Experiment Video

Updated: Jun 25, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
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Multileaf collimator-based linear accelerator radiosurgery: five-year efficiency analysis.

Joshua D Lawson1, Tim Fox, Anthony F Waller

  • 1Department of Radiation Oncology, University of California, San Diego, San Diego, California, USA.

Journal of the American College of Radiology : JACR
|March 3, 2009
PubMed
Summary
This summary is machine-generated.

Linear accelerator (linac) radiosurgery using multileaf collimators is efficient, with most patients treated in under 30 minutes. This study provides benchmark data for stereotactic radiosurgery delivery times.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Neurosurgery

Background:

  • Emory University's linear accelerator (linac) radiosurgery program transitioned from circular collimators to multileaf collimators in 2001.
  • Significant program changes include adopting dynamic conformal arc (DCA) therapy with pre-treatment imaging in 2002 and utilizing higher dose rates (600-1,000 MU/min) from 2005 onwards.

Purpose of the Study:

  • To analyze the treatment delivery time for linac-based stereotactic radiosurgery.
  • To identify factors influencing treatment duration.
  • To provide benchmark data for centers establishing radiosurgery programs.

Main Methods:

  • A custom software tool was developed to extract data from the record-and-verify system for 510 stereotactic radiosurgery patients treated between March 2001 and October 2006.
  • Data collected included treatment technique, total treatment time, number of isocenters, number of fields, total monitor units, and dose rate.

Main Results:

  • Dynamic conformal arc (DCA) therapy averaged 24.1 minutes, while static conformal beams averaged 19.3 minutes (without pre-treatment imaging).
  • Eighty percent of patients completed treatment in under 30 minutes.
  • Increasing isocenters prolonged treatment time, but higher dose rates (1,000 MU/min) did not significantly reduce overall delivery time, indicating beam-on time is not the primary factor.

Conclusions:

  • Multileaf collimator-based linac radiosurgery is an efficient treatment modality, with the majority of patients treated in under 30 minutes.
  • The efficiency of stereotactic radiosurgery suggests that dedicated treatment units may not be necessary for busy centers, optimizing resource allocation.