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First Cerenkov charge-induction (CCI) TlBr detector for TOF-PET and proton range verification.
Gerard Ariño-Estrada1,2, Gregory S Mitchell1, Hadong Kim3
1Department of Biomedical Engineering, University of California Davis, Davis, CA, United States of America.
Physics in Medicine and Biology
|July 26, 2019
Summary
This study introduces a novel thallium bromide detector combining charge induction and Cerenkov light detection. This dual-readout system achieves excellent timing and energy resolution, paving the way for advanced imaging applications.
Area of Science:
- Materials Science
- Particle Detectors
- Medical Imaging
Background:
- Thallium bromide (TlBr) is a semiconductor with excellent Cerenkov radiation properties.
- Existing detectors often rely on single readout methods, limiting performance.
Purpose of the Study:
- To evaluate a TlBr detector integrating both charge induction and Cerenkov light readouts.
- To assess the combined system's timing, energy, and spatial resolution capabilities.
- To explore its potential for advanced medical imaging applications.
Main Methods:
- Manufactured a 4x4x5 mm³ TlBr detector with segmented anode and monolithic cathode.
- Coupled a silicon photomultiplier (SiPM) to read Cerenkov light.
- Evaluated detector performance using simultaneous charge induction and Cerenkov light detection.
Main Results:
- Achieved timing resolution <400 ps (FWHM) and energy resolution ~8.5% at 511 keV.
- Obtained coincidence time resolution of 330 ps for selected Cerenkov events.
- Demonstrated potential for depth-of-interaction (DOI) positioning by analyzing electron drift times.
Conclusions:
- The combined charge induction and Cerenkov light detection in TlBr offers superior timing, energy, and spatial resolution.
- This new detector family is ideal for high-energy gamma photon detection.
- Applications include time-of-flight positron emission tomography (TOF-PET) and prompt gamma imaging (PGI).
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