A Prototype VP-PET Imaging System Based on Highly Pixelated CdZnTe Detectors

Yin, Yan; Li, Yingguo; Wang, Tianguan; Huang, Chuan; Ye, Zhenqian; Li, Gongping

doi:10.3390/s20051294

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…Our previous work demonstrated the potential for sub-0.5mm resolution with a CdTe-based PET prototype using a synthetic resolution point-source [20]. Finally, there also have been significant efforts in ultrahighresolution virtual-pinhole PET (VP-PET) using CZT detectors as inserts [21] [22][23] [24]. In Table I, we summarize the characterization of detectors used in recent experimental research on CZT/CdTe-based PET systems.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of a 3-D CZT Imaging Spectrometer for Potential Use in Compton-Enhanced PET Imaging

Jin

Streicher

Yang

et al. 2023

IEEE Trans. Radiat. Plasma Med. Sci.

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We constructed a prototype positron emission tomography (PET) system and experimentally evaluated large-volume 3-D cadmium zinc telluride (CZT) detectors for potential use in Compton-enhanced PET imaging. The CZT spectrometer offers sub-0.5 mm spatial resolution, an ultrahigh energy resolution (~1% @ 511 keV) and the capability of detecting multiple gamma-ray interactions that simultaneously occurred. The system consists of four CZT detector panels with a detection area of around 4.4 cm × 4.4 cm. The distance between the front surfaces of the two opposite CZT detector panels is ~80 mm. This system allows us to detect coincident annihilation photons and Compton interactions inside the detectors and then exploit Compton kinematics to predict the first Compton interaction site and reject chance coincidences. We have developed a numerical integration technique to model the near-field Compton response that incorporates Doppler broadening, detector's finite resolutions, and the distance between the first and second interactions. This method was used to effectively reject random and scattered coincidence events. In the preliminary imaging studies, we have used point-sources, line-sources, a custom-designed resolution phantom and a commercial image quality (IQ) phantom to demonstrate an imaging resolution of approximately 0.75 mm in PET images, and Compton-based enhancement.

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Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of a 3-D CZT Imaging Spectrometer for Potential Use in Compton-Enhanced PET Imaging

Jin

Streicher

Yang

et al. 2023

IEEE Trans. Radiat. Plasma Med. Sci.

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Simulation study of neutron radiation damage to cadmium zinc telluride

Wei¹,

Gao²,

Lü³

et al. 2022

Acta Phys. Sin.

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In recent years, the development of new semiconductor materials has brought opportunities and challenges to technological innovation and the development of emerging industries. Among them, cadmium zinc telluride material have highlighted important application prospects due to their excellent properties. CdZnTe as the third-generation cutting-edge strategic semiconductor material, has the advantages of high detection efficiency, low dark current, strong portability, and can be used at room temperature without additional cooling system. However, when the cadmium zinc telluride detector is exposed to radiation environment for a long time, it will cause different degrees of radiation damage, which will affect the performance of the device or even fail, and greatly shorten the service time of the detector in the radiation field. The transport process of 1-14 MeV neutrons in CdZnTe material was simulated to obtain the information of the primary knock-on atoms, and then combined with the cascade collision model, the irradiation of neutrons with different energies in CdZnTe material was analyzed. The damage is simulated and calculated. The calculation results show that most of the primary knock-on atoms energy is located at the low-energy end, and with the increase of the incident neutron energy, the types of primary knock-on atoms are more abundant, and the energy also increases gradually; neutron irradiation of CdZnTe The non-ionizing energy loss is uniformly distributed along the depth direction in the material, and the non-ionizing energy loss first increases and then decreases with the increase of the incident neutron energy; the calculation results of dpa show that the dpa also increases first with the increase of the incident neutron energy. And further analysis shows that the number of Te and Zn displacement atom atoms increases first and then decreases with the increase of incident neutron energy, while the number of Cd displacement atoms increases with the increase of incident neutron energy, which is co-modulated by its inelastic scattering cross-section and other nuclear-like reaction cross-sections. The comprehensive analysis shows that with the increase of the incident neutron energy, inelastic scattering becomes the main factor causing the internal displacement damage of the material.

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A Prototype VP-PET Imaging System Based on Highly Pixelated CdZnTe Detectors

Cited by 2 publications

References 27 publications

Experimental Evaluation of a 3-D CZT Imaging Spectrometer for Potential Use in Compton-Enhanced PET Imaging

Experimental Evaluation of a 3-D CZT Imaging Spectrometer for Potential Use in Compton-Enhanced PET Imaging

Simulation study of neutron radiation damage to cadmium zinc telluride

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