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Development of shielding evaluation and management program for O-ring type linear accelerators
Dong Hyeok Choi1,2, So Hyun Ahn3, Dong Wook Kim4,5
1Department of Medicine, Yonsei University College of Medicine, Seoul, Korea.
Scientific Reports
|May 10, 2024
Summary
This study introduces the ORSE program for evaluating radiation shielding in O-ring linear accelerators (LINACs). The program accurately predicts shielding parameters, ensuring patient safety in modern radiation therapy facilities.
Area of Science:
- Medical Physics
- Radiation Oncology
- Health Physics
Background:
- Shielding parameters for linear accelerators (LINACs) are influenced by geometry, treatment techniques, and beam energy.
- The increasing adoption of O-ring type LINACs necessitates updated shielding evaluations.
Purpose of the Study:
- To evaluate the shielding parameters of new O-ring type LINACs.
- To validate a newly developed dedicated program, ORSE (O-ring type Radiation therapy equipment Shielding Evaluation), for shielding assessment.
Main Methods:
- Shielding evaluation performed in four treatment rooms (Elekta Unity, Varian Halcyon, Accuray Tomotherapy).
- The ORSE program calculated transmitted dose, maximum patient capacity, and wall thickness using patient data.
- Glass dosimeters were used for five-day dose measurements to compare with ORSE program results.
Main Results:
- Discrepancies of up to 65.0% and 33.8% were observed in IMRT and use factors, respectively, compared to safety management reports.
- Transmitted dose at all measured locations was below 1% of the dose limit.
- ORSE program results showed a maximum difference of 0.003 mSv/week compared to experimental measurements.
Conclusions:
- The ORSE program provides accurate shielding evaluations for O-ring type LINACs based on institutional patient data.
- The developed program aids in ensuring radiation safety in clinical environments.
- Shielding evaluations confirmed that transmitted doses remain well within safe limits.
