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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Assessing dose rate distributions in VMAT plans.

P-H Mackeprang1, W Volken, D Terribilini

  • 1Division of Medical Radiation Physics and Department of Radiation Oncology, Inselspital, Bern University Hospital, and University of Bern, Bern, Switzerland.

Physics in Medicine and Biology
|March 31, 2016
PubMed
Summary

A new tool accurately analyzes dose rates in volumetric modulated arc therapy (VMAT) radiotherapy. Clinical VMAT plans show dose rates vary continuously, typically under 100 cGy/min for standard fractionation.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Physics

Background:

  • Dose rate is critical in radiobiology and radiotherapy.
  • Modern techniques like VMAT dynamically modulate dose rates.
  • Assessing these dynamic dose rate changes is essential for treatment accuracy.

Purpose of the Study:

  • To develop and validate a tool for analyzing dose rate distributions in VMAT plans.
  • To quantify dose rate variations within individual treatment fractions.
  • To compare calculated dose rates with measured data.

Main Methods:

  • VMAT plans were segmented into arc sectors with constant monitor unit (MU) rates.
  • Dose distributions were calculated independently for each sector and summed.
  • Dose rate calculations were validated using dose measurements and video analysis.
  • Two visualization methods were developed: 2D histograms and dose rate color wash on CT images.

Main Results:

  • The developed tool achieved sub-second accuracy in analyzing VMAT dose rates.
  • Measurement validation showed agreement within ±0.4 s for timing and ±0.1 MU for dose.
  • Clinical VMAT cases revealed dose rates across a continuous spectrum.
  • Mean dose rates in conventional fractionation typically remained below 100 cGy/min.

Conclusions:

  • A validated tool for precise dose rate analysis in VMAT is now available.
  • Clinical VMAT treatments exhibit a wide range of dose rates.
  • Understanding these dose rate variations is crucial for optimizing radiotherapy delivery and radiobiological outcomes.