Fisher information analysis of depth-of-interaction estimation in double-sided strip detectors

Esen Salcin, Harrison H. Barrett, H. Bradford Barber, Shinrichiro Takeda, Shin Watanabe, Tadayuki Takahashi, Lars R. Furenlid

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


In very-high-spatial-resolution gamma-ray imaging applications, such as preclinical PET and SPECT, estimation of 3D interaction location inside the detector crystal can be used to minimize parallax error in the imaging system. In this work, we investigate the effect of bias voltage setting on depth-of-interaction (DOI) estimates for a semiconductor detector with a double-sided strip geometry. We first examine the statistical properties of the signals and develop expressions for likelihoods for given gamma-ray interaction positions. We use Fisher Information to quantify how well (in terms of variance) the measured signals can be used for DOI estimation with different bias-voltage settings. We performed measurements of detector response versus 3D position as a function of applied bias voltage by scanning with highly collimated synchrotron radiation at the Advanced Photon Source at Argonne National Laboratory. Experimental and theoretical results show that the optimum bias setting depends on whether or not the estimated event position will include the depth of interaction. We also found that for this detector geometry, the z-resolution changes with depth.

Original languageEnglish (US)
Article number6819048
Pages (from-to)1243-1251
Number of pages9
JournalIEEE Transactions on Nuclear Science
Issue number3
StatePublished - Jun 2014


  • CdTe
  • CdZnTe
  • DOI
  • Fisher Information
  • double-sided strip
  • semiconductor detectors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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