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Small field dose measurements using plastic scintillation detector in heterogeneous media
Jinyu Xue1, Jesse D McKay2, Jimm Grimm3
1Department of Radiation Oncology, NYU Langone Medical Center, New York, NY, 10016, USA.
Medical Physics
|April 12, 2017
Summary
Plastic scintillation detectors accurately measure small field dosimetry in heterogeneous media, showing less than 3% difference compared to Monte Carlo calculations for stereotactic radiation therapy.
Area of Science:
- Medical Physics
- Radiation Oncology
Background:
- Accurate small field dosimetry is crucial for stereotactic radiation treatments.
- Heterogeneous media present challenges for precise dose calculations.
Purpose of the Study:
- Evaluate plastic scintillation detectors for small field dosimetry.
- Verify dose measurement accuracy against Monte Carlo calculations in a heterogeneous phantom.
Main Methods:
- Used CyberKnife system with a custom lung phantom.
- Employed Exradin W1 scintillation detector and Exradin A16 ion chamber.
- Measured doses for cone sizes 5-60 mm, compared with MultiPlan Monte Carlo calculations.
Main Results:
- Plastic scintillation detectors are applicable for small field dosimetry in heterogeneous media.
- Differences between calculated and measured output factors were <3% for all cone sizes.
- Scintillation detector measurements agreed within 3% of Monte Carlo calculations in lung phantom for cones ≥20 mm.
Conclusions:
- Plastic scintillation detectors show good agreement in both homogeneous and heterogeneous media.
- Accurate dose calculation for small static beams is critical for treatment planning and outcomes.
- Findings support the use of scintillation detectors for precise small field dosimetry.