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Variable dose rate single-arc IMAT delivered with a constant dose rate and variable angular spacing.

Grace Tang1, Matthew A Earl, Cedric X Yu

  • 1Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, MD, USA.

Physics in Medicine and Biology
|October 13, 2009
PubMed
Summary
This summary is machine-generated.

This study demonstrates that constant dose-rate (CDR) intensity-modulated arc therapy (IMAT) with variable angular spacing can achieve similar plan quality to variable dose-rate (VDR) IMAT. This CDR approach enables VDR RapidArc plans on existing linear accelerators without compromising treatment efficiency.

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Planning

Background:

  • Single-arc intensity-modulated arc therapy (IMAT) offers superior plan quality and efficient delivery, often requiring variable dose-rate (VDR) capabilities.
  • VDR requirements complicate linear accelerator (linac) hardware and software, limiting IMAT implementation on many existing machines.

Purpose of the Study:

  • To develop and validate an alternative planning approach for single-arc IMAT using constant dose-rate (CDR) delivery with variable angular spacing.
  • To demonstrate the feasibility of converting VDR-optimized plans to CDR plans without compromising dose distribution or treatment efficiency.

Main Methods:

  • VDR-optimized RapidArc plans were converted to CDR plans by redistributing evenly spaced beams to uneven spacing based on monitor unit (MU) weightings.
  • Angular deviation was limited to +/- 5 degrees by dividing the treatment arc into multiple sectors.
  • CDR plans were delivered with a single gantry sweep, utilizing different CDR values for each sector, with extra mode-up time (xMOT) between sector transitions.

Main Results:

  • Converted CDR plans achieved dose distributions comparable to original VDR plans across four patient cases (head-and-neck, brain, prostate).
  • Complex plans required up to four sectors to maintain plan quality.
  • CDR plan delivery times were slightly longer (average < 1 min) than VDR plans, with an average of 0.33 min xMOT per sector transition.

Conclusions:

  • Variable dose-rate (VDR) may not be essential for single-arc IMAT.
  • The proposed CDR approach with variable angular spacing allows VDR RapidArc plans to be implemented on non-VDR linacs, preserving plan quality and treatment efficiency.
  • Further optimization of variable angular spacing can minimize CDR delivery times, maintaining IMAT's high efficiency.