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Related Experiment Video

Updated: May 26, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
07:31

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

Published on: May 9, 2014

3D dose reconstruction for narrow beams using ion chamber array measurements.

Karin Schombourg1, François O Bochud, René-Olivier Mirimanoff

  • 1Institute of Radiation Physics, University Hospital Centre and University of Lausanne, Grand-Pré 1, CH-1007 Lausanne, Switzerland.

Zeitschrift Fur Medizinische Physik
|January 3, 2012
PubMed
Summary

This study validates a 3D dose reconstruction method for verifying absorbed dose in narrow beam radiation therapy. The algorithm achieved accurate dose agreement, demonstrating its potential for clinical application.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Dosimetry

Background:

  • Accurate verification of delivered absorbed dose is crucial in radiation therapy.
  • 3D dose reconstruction methods are essential for quality assurance.
  • Evaluating these methods in specific clinical scenarios, like narrow beams, is necessary.

Purpose of the Study:

  • To describe and evaluate a novel 3D dose reconstruction method.
  • To assess the method's performance using phantoms with narrow beams.
  • To test the algorithm's sensitivity to simulated setup errors and organ motion.

Main Methods:

  • Irradiation of solid water and bone-equivalent material phantoms using a 6 MV linear accelerator.
  • Measurement of transmitted dose with a 2D ion chamber detector array.

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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
06:20

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Published on: March 11, 2021

Related Experiment Videos

Last Updated: May 26, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
07:31

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

Published on: May 9, 2014

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
06:20

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Published on: March 11, 2021

  • Application of an iterative algorithm for 3D dose reconstruction and simulation of setup errors/motion.

    • Main Results:

    • Algorithm convergence achieved within three iterations across all tested configurations.
    • Local reconstructed dose agreement of at least 3%/3mm was obtained, with minor deviations in penumbra regions.
    • Reconstructed primary fluences closely matched planned fluences, validating the reconstruction process.

    Conclusions:

    • The developed 3D dose reconstruction method is validated for simple geometries and narrow beams.
    • The method demonstrates sensitivity to phantom setup errors and interfraction motion in heterogeneous scenarios.
    • This technique shows promise for enhancing the verification of absorbed dose in clinical radiation therapy.