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SU-E-J-165: Development of a Low-Cost and Clinically Available Patient Intrafraction Motion Monitoring System.

Y Uchida^1,2, H Tachibana^1,2, Y Takada^1,2

¹Tokyo Radiation Oncology Clinic Koutou, Tokyo, Japan.

Medical Physics

|May 19, 2017

Summary

A low-cost intrafraction motion monitoring system using a webcam and telescope was developed. It achieves clinically acceptable accuracy, comparable to the Varian RPM system, for improved radiation therapy.

Keywords:

Calibration Cameras Computer simulation Computer software Computer systems Rotation measurement Telescopes Therapeutics Time measurement

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Area of Science:

Medical Physics
Radiation Oncology
Image Guidance

Background:

Accurate intrafraction motion monitoring is crucial for precise radiation therapy delivery.
Existing systems can be costly, limiting widespread clinical adoption.
Developing affordable and effective intrafraction motion monitoring solutions is essential.

Purpose of the Study:

To develop and evaluate a low-cost, flexible system for monitoring intrafraction motion.
To extend a previously developed monitoring system for clinical use.
To assess the system's accuracy and compare it with a commercial system.

Main Methods:

A system comprising a webcam, telescope, PC with custom software, and marker box was utilized.
A dynamic calibration algorithm was implemented to account for patient rotation.
Simultaneous marker tracking using template matching and parallel CPU computing was performed for intrafraction motion measurement.

Main Results:

The developed system demonstrated clinically acceptable accuracy, with amplitude measurements comparable to the Varian Real-Time Position Management (RPM) System.
Measurements remained within the tolerance values defined by AAPM Task Group 142 across various camera angles.
The system achieved a marker position calculation time of approximately 50 milliseconds, including latency.

Conclusions:

The proposed low-cost intrafraction motion monitoring system offers clinically acceptable accuracy.
Its affordability facilitates broader implementation, potentially enhancing radiation treatment accuracy.
This system represents a significant contribution to improving patient safety and treatment efficacy in radiotherapy.