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Updated: Feb 9, 2026
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Treatment of Liver Metastases Using an Internal Target Volume Method for Stereotactic Body Radiotherapy
Published on: May 8, 2018
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Real-time high spatial resolution dose verification in stereotactic motion adaptive arc radiotherapy
Mitchell Duncan1, Matthew K Newall1, Vincent Caillet2
1Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, Australia.
Journal of Applied Clinical Medical Physics
|June 7, 2018
Summary
A novel 2D silicon detector, MagicPlate-512, accurately reconstructs radiation doses during real-time multileaf collimator (MLC) tracking. This technology offers a feasible solution for quality assurance in adaptive radiotherapy, improving treatment precision.
Area of Science:
- Medical Physics
- Radiation Oncology
- Detector Technology
Background:
- Real-time multileaf collimator (MLC) tracking in radiation therapy requires robust quality assurance methods.
- Current methods lack speed for pretreatment or real-time verification during dynamic treatment delivery.
Purpose of the Study:
- To evaluate the MagicPlate-512 (MP512), a 2D silicon detector, for dose reconstruction during MLC tracking.
- To assess its performance in a simulated clinical setting with real-time MLC leaf adjustments.
Main Methods:
- MP512 was tested in a solid water phantom on a motion platform simulating patient movement.
- Electromagnetic target tracking and MLC tracking software were employed.
- 2D dose distributions were reconstructed and compared with EBT3 film and treatment planning system (TPS) using gamma analysis.
Main Results:
- MP512 demonstrated high agreement with EBT3 film (99% at 3%/3 mm) and TPS (100% at 3%/3 mm).
- Agreements of 95% and 98% were achieved with stricter 2%/2 mm criteria.
- The detector accurately captured dose profiles, and the MLC tracking mitigated motion-induced penumbra effects by 80%.
Conclusions:
- MP512 enables high-resolution 2D dose reconstruction for adaptive MLC tracking and arc deliveries.
- It is a promising tool for 2D small field dosimetry and pretreatment quality assurance.
- Detector-based dosimetry is clinically viable for real-time MLC tracking modalities.
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