Recovery of spectral information from an imperfect detector using the expectation maximization algorithm

Joshua D. Eskin, Harrison H. Barrett, H. Bradford Barber

Research output: Contribution to conferencePaper

Abstract

A gamma-ray detector can be modeled as a linear system which maps a photon flux with a given energy distribution to a pulse-height spectrum. In a perfect detector, the response to a monoenergetic beam would be a delta function. In any real detector, carrier trapping, escape of K x-rays, Compton scattering, and instrument noise will produce a broadened response function. We develop a model of the response function of a ZnCdTe detector and use it to recover the incident energy spectrum from a measured pulse height spectrum using the Expectation-Maximization (EM) algorithm. This technique can be applied to any type of nuclear detector, using any combination of modeled and measured response functions. An analysis of the noise cost incurred in the reconstruction algorithm shows that the technique can be used to advantage even with relatively few counts in the measured spectrum.

Original languageEnglish (US)
Pages150-154
Number of pages5
StatePublished - Jan 1 1995
EventProceedings of the 1994 Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 4) - Norfolk, VA, USA
Duration: Oct 30 1994Nov 5 1994

Other

OtherProceedings of the 1994 Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 4)
CityNorfolk, VA, USA
Period10/30/9411/5/94

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ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Industrial and Manufacturing Engineering

Cite this

Eskin, J. D., Barrett, H. H., & Barber, H. B. (1995). Recovery of spectral information from an imperfect detector using the expectation maximization algorithm. 150-154. Paper presented at Proceedings of the 1994 Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 4), Norfolk, VA, USA, .