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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
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Miniaturized scintillator dosimeter for small field radiation therapy
Mathieu Gonod1, Carlos Chacon Avila2, Miguel Angel Suarez2
1Centre Georges François Leclerc (CGFL)-Dijon, France.
Physics in Medicine and Biology
|May 10, 2021
Summary
A new miniaturized inorganic scintillator detector offers high-resolution measurements for small photon fields in radiation therapy. This compact detector provides accurate dose verification, overcoming limitations of existing probes.
Area of Science:
- Medical Physics
- Radiation Detection and Measurement
- Radiotherapy Technology
Background:
- Accurate dose measurement is critical in external beam radiation therapy, especially for small photon fields.
- Existing detectors can suffer from volume averaging and stem effects, impacting measurement precision.
- The development of compact, high-resolution detectors is needed for advanced radiotherapy techniques.
Purpose of the Study:
- To demonstrate the concept and performance of a miniaturized inorganic scintillator detector (MSD).
- To evaluate the MSD's suitability for analyzing small static photon fields in external radiation therapy.
- To compare the MSD's response with established high-resolution probes like micro-diamond detectors and silicon diodes.
Main Methods:
- Fabrication of an MSD using a 0.25 mm diameter inorganic scintillating cell coupled to a silica optical fiber via a photonic interface.
- Characterization of the MSD's response under a 6 MV bremsstrahlung beam across various field sizes (1x1 cm² to 4x4 cm²).
- Comparison of MSD measurements with micro-diamond and silicon diode probes, including beam profiling and percentage depth dose analysis.
Main Results:
- The MSD exhibited a linear dose response, repeatability within 0.1%, and minimal directional dependence (0.36%).
- Beam profiling showed close agreement with micro-diamond detectors, with width measurement differences not exceeding 0.25 mm.
- Percentage depth dose deviations were within 2.3% compared to micro-diamond detectors for small field sizes.
Conclusions:
- The miniaturized inorganic scintillator detector is a viable tool for accurate dose verification in small field radiation therapy.
- Its compact size, high resolution, and ease of use offer advantages over conventional detectors, minimizing volume averaging and stem effects.
- The MSD shows potential for applications in Brachytherapy, FLASH-radiotherapy, and microbeam radiation therapy.
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