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[Proton irradiation synchronized with respiratory cycle].

T Inada¹, H Tsuji, Y Hayakawa

¹Proton Medical Research Center, University of Tsukuba.

Nihon Igaku Hoshasen Gakkai Zasshi. Nippon Acta Radiologica

|August 25, 1992

Summary

This study synchronized proton accelerator irradiation with the respiratory cycle using a strain gauge to monitor chest wall movement. The novel method effectively spared treatment volume during the expiratory phase.

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Area of Science:

Medical Physics
Respiratory Physiology
Radiation Oncology

Context:

Synchronizing radiation therapy with patient breathing is crucial for precise dose delivery.
Traditional methods may lack accuracy in real-time respiratory phase detection.
Optimizing radiation delivery to target tumors while sparing healthy tissue is a significant challenge.

Purpose:

To develop and evaluate a novel method for synchronizing proton beam irradiation with the respiratory cycle.
To utilize a sensitive strain gauge for accurate chest wall movement detection.
To assess the efficacy of respiratory-gated irradiation using dose-volume histogram analysis.

Summary:

A sensitive strain gauge was employed to detect chest wall movement, enabling synchronization of a proton accelerator irradiation control system with the respiratory cycle.

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The system generates a timing signal during the expiratory phase (1.5-2 seconds) for synchronized irradiation.

Efficacy was evaluated using dose-volume histogram analysis based on CT images, calculating the spared treatment volume.

Impact:

This novel respiratory-gated irradiation method demonstrates high effectiveness in sparing treatment volume.
The technique offers potential for improved precision in radiation oncology.
Enhanced accuracy in dose delivery can lead to better patient outcomes and reduced side effects.