Two-crossed-polarizers based optical property modulation method for ionizing radiation detection for positron
Yuli Wang1,2, Yingjie Li3, Fei Yi3
1China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.
Physics in Medicine and Biology
|May 23, 2019
Summary
This study introduces a simpler, compact detector for positron emission tomography (PET) using the Pockels effect. Cadmium Telluride (CdTe) crystals show higher sensitivity than Lithium Niobate (LiNbO3) for detecting 511 keV photons.
Area of Science:
- Medical Physics
- Photon Detection
- Positron Emission Tomography (PET)
Background:
- The Pockels effect and optics pump-probe measurements offer a novel approach to ionizing radiation photon detection for PET.
- This method could potentially overcome limitations in coincidence time resolution inherent in current PET technology.
Purpose of the Study:
- To introduce a simpler, more compact two-crossed-polarizers setup for ionizing radiation detection.
- To evaluate the performance of Lithium Niobate (LiNbO3) and Cadmium Telluride (CdTe) detector crystals using this setup.
- To discuss the properties of an ideal detector crystal for this application.
Main Methods:
- Utilized a two-crossed-polarizers setup to detect modulation signals induced by 511 keV photons.
- Employed Lithium Niobate (LiNbO3) and Cadmium Telluride (CdTe) as detector crystals.
- Investigated the effect of bias voltage on modulation signal strength and detector performance.
Main Results:
- Modulation signals from 511 keV photons were repeatable in both LiNbO3 and CdTe crystals.
- CdTe exhibited eight times higher detection sensitivity than LiNbO3 under identical bias voltage.
- Modulation signal strength increased linearly with bias voltage, with LiNbO3 showing continued increase beyond 2000V due to high resistivity.
Conclusions:
- The two-crossed-polarizers method is effective for detecting 511 keV photons using LiNbO3 and CdTe.
- CdTe offers superior detection sensitivity compared to LiNbO3, attributed to its high effective Z number and density.
- Optimizing bias voltage, particularly for high-resistivity materials like LiNbO3, can enhance modulation strength and improve PET detector sensitivity.
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