Study of detection efficiency of Cd 1-xZn xTe detectors for digital radiography

George C. Giakos, Srinivasan Vedantham, Samir Chowdhury, Jibril Odogba, Amlan Dasgupta, B. Pillai, Daniel B. Sheffer, Richard E. Nemer, Ravi Kumar Guntupalli, Sankararaman Suryanarayanan, Victor A. Vega-Lozada, Robert J. Endorf, Anthony Passalaqua

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


In this paper, the signal-to-noise ratio (S/N) of resistive Cd 1-xZn xTe semiconductor detectors, at different directions of irradiation, within the X-ray diagnostic energy range, has been experimentally studied. In addition, the dependence of the spatial resolution of a planar Cd 1-xZn xTe substrate both on the applied bias voltage and thickness has been experimentally determined. The detection efficiency of semiconductor detectors depend upon the energy absorption efficiency as well as the collection efficiency. This study suggests that high signal-to-noise ratios can be obtained by optimally choosing which polarizing electrode is directly exposed to the incident X-ray beam, as well as on both the detector thickness and applied bias voltage. In addition, the experimental results on the temporal system MTF indicate a spatial resolution of >6 cy/mm. Besides the intrinsic charge transport characteristics of the semiconductor sample, by decreasing the collector size and optimizing the X-ray digital system geometry and temporal response, the temporal system MTF can be improved significantly. The research imaging detector system allows one to investigate methods to improve the detection and imaging performance parameters as part of the development of a digital radiographic system.

Original languageEnglish (US)
Pages (from-to)244-251
Number of pages8
JournalIEEE Transactions on Instrumentation and Measurement
Issue number1
StatePublished - 1998
Externally publishedYes


  • Cd Zn Te detectors
  • Collection efficiency
  • Detection efficiency
  • Energy absorption efficiency
  • Modulation transfer function (MTF)
  • Physical parameters
  • Spatial resolution
  • X-ray digital radiography

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering


Dive into the research topics of 'Study of detection efficiency of Cd 1-xZn xTe detectors for digital radiography'. Together they form a unique fingerprint.

Cite this