A simple system for detecting patient movement during radiation therapy

Area of Science:

• Medical Physics
• Radiation Oncology
• Biomedical Engineering

Background:

• Accurate patient positioning is critical for effective radiation therapy.
• Patient movement during treatment can lead to suboptimal radiation delivery and potential harm.
• Current verification methods may be time-consuming or resource-intensive.

Purpose of the Study:

• To develop and evaluate a simple, inexpensive system for detecting patient movement during radiation therapy.
• To provide real-time alerts to radiation-therapy technologists for immediate intervention.
• To compare the efficacy of this system with standard verification techniques.

Main Methods:

• Utilized existing laser localization lights from isocentric linear accelerators.
• Integrated simple and cost-effective electronic circuitry for movement detection.
• Implemented a system generating visual or audible signals upon detected patient displacement.

Main Results:

• The developed system successfully detects patient movement during radiation therapy.
• Alerts are generated promptly, enabling technologists to interrupt and correct patient position.
• Verification of patient position using this method shows favorable comparison to certification radiographs.

Conclusions:

• This laser-based system offers a practical and economical solution for real-time patient movement detection in radiation therapy.
• It enhances treatment accuracy and safety by facilitating timely repositioning.
• The system provides a viable alternative or adjunct to conventional patient position verification methods.