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A 2D detector array for relative dosimetry and beam steering for FLASH radiotherapy with electrons
Andreas A Schönfeld1, Jeff Hildreth1, Alexandra Bourgouin2,3
1Research and Development, Sun Nuclear Corp., Melbourne, Florida, USA.
Medical Physics
|December 17, 2024
Summary
A new detector array, the FLASH Profiler, accurately measures ultra-high pulsed dose rate (UHPDR) electron beams in real-time. This advancement is crucial for quality control and beam steering in FLASH radiotherapy.
Area of Science:
- Medical Physics
- Radiation Oncology
- Detector Technology
Background:
- FLASH radiotherapy utilizes ultra-high dose rate beams, necessitating specialized detectors for accurate characterization.
- Conventional dosimetry methods are insufficient for the high dose rates and pulse structures of FLASH beams.
- Existing detector arrays are not suitable for ultra-high dose rate (UHPDR) applications.
Purpose of the Study:
- Develop and characterize a 2D detector array for real-time, pulse-resolved measurements of UHPDR electron beams.
- Assess the temporal structure of intra-pulse dose rates in FLASH radiotherapy.
- Provide a tool for computerized treatment planning and quality control.
Main Methods:
- Evaluated SunPoint 1 diode performance in a 20 MeV UHPDR electron beam (0.04–6 Gy/pulse).
- Modified a PROFILER 2 detector array into the "FLASH Profiler" by optimizing signal acquisition and minimizing resistance.
- Tested the FLASH Profiler in UHPDR electron beams with varying pulse durations and dose rates.
Main Results:
- The FLASH Profiler demonstrated a linear response (±3% deviation) across the tested dose per pulse range.
- Achieved agreement with point detector measurements up to 6 Gy/pulse.
- Enabled real-time, single-pulse lateral beam profile measurements and demonstrated beam steering capabilities.
- SunPoint 1 diode achieved 4 ns time resolution for pulse duration and intra-pulse dose rate measurements.
Conclusions:
- The FLASH Profiler is suitable for characterizing UHPDR electron beams.
- This detector array facilitates quality control and beam steering for electron FLASH irradiators.
- Enables precise dosimetry for advanced radiotherapy techniques.
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