Large area photon counting x-ray imaging arrays for clinical dual-energy applications

William C. Barber, Einar Nygard, Jan C. Wessel, Nail Malakhov, Gregor Wawrzyniak, Neal E. Hartsough, Thulasi Gandhi, Tom J. Beck, Ken Taguchi, Jan S. Iwanczyk

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report on the development of fast photon counting x-ray imaging arrays for dual-energy clinical applications. In order to provide the arrays with adequate performance for clinical dual-energy applications, we have designed and fabricated a novel four threshold application specific integrated circuit (ASIC) for single photon counting readout from pixellated direct-conversion CdTe sensors. The ASIC readout and CdTe photon counting detectors are integrated into modules so that the modules can be tiled in one dimension for the fabrication of large area arrays. Recently we have developed novel CdTe arrays which significantly reduce the noise floor allowing for low energy clinical imaging applications. We report on a characterization study of a prototype large area detector which can be used for the generation of two or three dimensional dual energy x-ray absorptiometry (DEXA) images. The prototype CdTe array has 256 pixels with about a 1 mm pitch. We have measured several important detector parameters including the maximum output count rate, energy resolution, and noise performance. A maximum output rate of 0.6 million counts per second per pixel has been obtained with a low noise floor below 7 keV and an energy resolution of 6% at 60 keV. All detector noise counts are less that 7 keV which is sufficiently low for clinical DEXA. Our results demonstrate noise and spectral characteristics that make these x-ray imaging arrays ideally suited for clinical DEXA.

Original languageEnglish (US)
Title of host publication2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009
Pages3029-3031
Number of pages3
DOIs
StatePublished - Dec 1 2009
Event2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009 - Orlando, FL, United States
Duration: Oct 25 2009Oct 31 2009

Publication series

NameIEEE Nuclear Science Symposium Conference Record
ISSN (Print)1095-7863

Other

Other2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009
CountryUnited States
CityOrlando, FL
Period10/25/0910/31/09

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging

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    Barber, W. C., Nygard, E., Wessel, J. C., Malakhov, N., Wawrzyniak, G., Hartsough, N. E., Gandhi, T., Beck, T. J., Taguchi, K., & Iwanczyk, J. S. (2009). Large area photon counting x-ray imaging arrays for clinical dual-energy applications. In 2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009 (pp. 3029-3031). [5401581] (IEEE Nuclear Science Symposium Conference Record). https://doi.org/10.1109/NSSMIC.2009.5401581