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KMID : 0357520160390010035
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Journal of Radiological Science and Technology
2016 Volume.39 No. 1 p.35 ~ p.42
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CdZnTe Detector for Computed Tomography based on Weighting Potential
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Lim Hyun-Jong
Park Chan-Sun
Kim Jung-Su
Kim Jung-Min
Choi Jong-Hak
Kim Ki-Hyun
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Abstract
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Room-temperature operating CdZnTe(CZT) material is an innovative radiation detector which could reduce the patient dose to one-tenth level of conventional CT (Computed Tomography) and mammography system. The pixel and pixel pitch in the imaging device determine the conversion efficiency of incident Xor gamma-ray and the cross-talk of signal, that is, image quality of detector system. The weighting potential is the virtual potential determined by the position and geometry of electrode. The weighting potential obtained by computer-based simulation in solving Poisson equation with proper boundaries condition. The pixel was optimized by considering the CIE (charge induced efficiency) and the signal cross-talk in CT detector system. The pixel pitch was 1-mm and the detector thickness was 2-mm in the simulation.
The optimized pixel size and inter-pixel distance for maximizing the CIE and minimizing the signal cross-talk is about 750 μm and 125 μm, respectively.
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KEYWORD
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CdZnTe , Weighting Potential , Cross-talk , charge induction efficiency , CT
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