Improving the spatial resolution in CZT detectors using charge sharing effect and transient signal analysis: Simulation study

Xiaoqing Zheng, Zeng Cheng, M. Jamal Deen, Hao Peng

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Cadmium Zinc Telluride (CZT) semiconductor detectors are capable of providing superior energy resolution and three-dimensional position information of gamma ray interactions in a large variety of fields, including nuclear physics, gamma-ray imaging and nuclear medicine. Some dedicated Positron Emission Tomography (PET) systems, for example, for breast cancer detection, require higher contrast recovery and more accurate event location compared with a whole-body PET system. The spatial resolution is currently limited by electrode pitch in CZT detectors. A straightforward approach to increase the spatial resolution is by decreasing the detector electrode pitch, but this leads to higher fabrication cost and a larger number of readout channels. In addition, inter-electrode charge spreading can negate any improvement in spatial resolution. In this work, we studied the feasibility of achieving sub-pitch spatial resolution in CZT detectors using two methods: charge sharing effect and transient signal analysis. We noted that their valid ranges of usage were complementary. The dependences of their corresponding valid ranges on electrode design, depth-of-interaction (DOI), voltage bias and signal triggering threshold were investigated. The implementation of these two methods in both pixelated and cross-strip configuration of CZT detectors were discussed. Our results show that the valid range of charge sharing effect increases as a function of DOI, but decreases with increasing gap width and bias voltage. For a CZT detector of 5 mm thickness, 100 μm gap and biased at 400 V, the valid range of charge sharing effect was found to be about 112.3 μm around the gap center. This result complements the valid range of the transient signal analysis within one electrode pitch. For a signal-to-noise ratio (SNR) of ∼17 and preliminary measurements, the sub-pitch spatial resolution is expected to be ∼30 μm and ∼250 μm for the charge sharing and transient signal analysis methods, respectively.

Original languageEnglish (US)
Pages (from-to)60-70
Number of pages11
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume808
DOIs
StatePublished - Feb 1 2016
Externally publishedYes

Keywords

  • Cadmium zinc telluride (CZT)
  • Charge sharing
  • Positron emission tomography (PET)
  • Spatial resolution
  • Transient signal analysis

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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