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Related Experiment Videos

Respiration gated radiotherapy treatment: a technical study

H D Kubo1, B C Hill

  • 1University of California, Davis Cancer Center, Section of Radiation Oncology, Sacramento 95817, USA.

Physics in Medicine and Biology
|January 1, 1996
PubMed
Summary

Respiratory gating synchronizes radiotherapy beams with breathing to minimize patient movement for upper torso treatments. This study identified optimal sensors and methods for gating, ensuring treatment accuracy and minimizing effects on linear accelerators.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Biomedical Engineering

Background:

  • Patient respiration causes significant organ movement in the upper torso during external-beam conformal radiotherapy.
  • Minimizing this movement is crucial for optimizing treatment accuracy and efficacy.
  • Respiratory-induced motion can lead to under- or over-dosing of target volumes.

Purpose of the Study:

  • To investigate the technical aspects of respiratory gating for radiotherapy beam delivery.
  • To identify the optimal respiration monitoring system for synchronizing treatment with breathing.
  • To assess the impact of gating on linear accelerator performance and radiation dose parameters.

Main Methods:

  • Evaluation of various respiration sensors: thermistor, thermocouple, strain gauge, and pneumotachograph.

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  • Measurement of organ displacement (breast, chest wall, lung) using fluoroscopic X-ray imaging.
  • Analysis of linear accelerator (Varian 2100C) gating effects on total dose, beam symmetry, and uniformity.

    • Main Results:

    • Identification of optimal respiration sensors for accurate gating.
    • Quantification of breast, chest wall, and lung motion during routine radiotherapy simulation.
    • No significant detrimental effects on the Varian 2100C linear accelerator's dose, symmetry, or uniformity due to gating were observed.

    Conclusions:

    • Respiratory gating is a viable technique for minimizing patient motion during upper torso radiotherapy.
    • The selected optimal sensors and methods enable precise synchronization of the radiotherapy beam with respiration.
    • Implementing respiratory gating does not adversely affect the performance of the Varian 2100C linear accelerator, supporting its clinical use.