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"Characterization of ELEKTA SRS cone collimator using high spatial resolution monolithic silicon detector array"
Khalsa Al Shukaili1,2, Stéphanie Corde1,3,4, Marco Petasecca1,3
1Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, Australia.
Journal of Applied Clinical Medical Physics
|May 24, 2018
Summary
The DUO detector accurately measures dosimetry for small radiation fields in stereotactic radiosurgery (SRS), agreeing well with EBT3 film and IBA SFD diode for quality assurance.
Area of Science:
- Medical Physics
- Radiation Oncology
- Dosimetry
Background:
- Stereotactic radiosurgery (SRS) requires precise radiation delivery.
- Accurate dosimetry is critical for effective SRS treatments.
- Evaluating new detectors for small radiation fields is essential.
Purpose of the Study:
- To assess the dosimetry accuracy of the DUO detector in small radiation fields produced by ELEKTA SRS cone collimators.
- To compare the DUO detector's performance against established detectors: EBT3 Gafchromic film and IBA Stereotactic diode (SFD).
Main Methods:
- Measurements of beam profiles, output factors, and percentage depth dose were performed for SRS cone collimators (5-50 mm diameter).
- Three detectors (DUO, EBT3 film, IBA SFD) were used at 10 cm depth and 90 cm source-to-surface distance (SSD).
Main Results:
- Excellent agreement was observed in beam profiles between DUO, EBT3, and IBA SFD (±0.5 mm FWHM, ±0.7 mm penumbra).
- Output factor measurements showed agreement within ±1% (DUO vs. EBT3) and ±2% (IBA SFD vs. EBT3/DUO).
- Percentage depth dose measurements for all cones agreed within ±2% across all three detectors.
Conclusions:
- The ELEKTA SRS cone collimator characteristics were successfully evaluated using DUO, EBT3, and IBA SFD.
- The DUO detector demonstrates suitability for rapid, real-time quality assurance dosimetry in small SRS/SRT fields.
- DUO's performance is validated by its strong agreement with EBT3 film measurements.