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Automated multi-parameter high-dose-rate brachytherapy quality assurance via radioluminescence imaging
Mengyu Jia1,2, Tae Jin Kim3,2, Yong Yang1
1Department of Radiation Oncology, Stanford University, Stanford, CA 94305, United States of America.
Physics in Medicine and Biology
|November 17, 2020
Summary
This study introduces an automated radioluminescence imaging system for high-dose-rate brachytherapy quality assurance. The system accurately measures dwell position, dwell time, and wire velocity simultaneously, ensuring treatment precision.
Area of Science:
- Medical Physics
- Radiotherapy Technology
- Quality Assurance in Radiation Oncology
Background:
- High-dose-rate (HDR) brachytherapy requires precise quality assurance (QA) for accurate radiation delivery.
- Current QA methods can be time-consuming and may not capture all critical parameters simultaneously.
- Automated systems are needed to improve efficiency and reliability in HDR brachytherapy QA.
Purpose of the Study:
- To develop an automated HDR brachytherapy QA system utilizing radioluminescence imaging.
- To enable simultaneous measurement of dwell position, dwell time, wire velocity, and relative source strength.
- To provide a practical and reliable solution for HDR brachytherapy QA.
Main Methods:
- A radioluminescence phosphor sheet (Gd2O2S:Tb and PDMS) was used with a HDR needle applicator.
- A digital camera captured radioluminescence signals, processed via a custom graphical user interface.
- Measurements were validated against customized treatment plans, correlating detector response with Air-Kerma strength (Sk).
Main Results:
- The system achieved mean deviations of 0.1 mm for dwell position and 32.5 ms for dwell time.
- A highly linear correlation (R² = 0.998) was demonstrated between system response and Sk.
- Measured wire velocities were comparable to previously reported values, validating the system's accuracy.
Conclusions:
- The developed radioluminescence imaging system offers a practical, reliable, and comprehensive solution for HDR brachytherapy QA.
- Simultaneous measurement capabilities enhance the efficiency and accuracy of QA procedures.
- The system's automated nature and compact design contribute to its potential widespread adoption.
