Share Email Print

Proceedings Paper

Photon-counting energy-sensitive micropattern gas detector for digital radiography
Author(s): Mustafa C. Altunbas; Eugene Franklin Barasch; Daniel R. Bednarek; Stephen Rudin
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

A photon counting energy sensitive micro-pattern gaseous detector is being developed for projection radiography. Two cascaded gas electron multipliers (GEMs) are used as gain stages following a drift region that acts as an absorption volume. Active area of the detector is 7cm x 7cm and the signal is read out by 0.2 mm pitch strips. An aluminum pressure vessel was designed as an integral part of the detector, which operates at pressures up to 10 atm. Voltage-gain curves were obtained for Ar and Kr mixtures. Energy resolution for a 5.9 keV Fe-55 was determined to be 20% FWHM. Energy spectra for a conventional x-ray generator operating at various voltages were also obtained. Detector MTF and DQE were calculated using linear systems analysis. The effect of primary electron range, a dominant factor in determining spatial resolution, and the effect of fluorescent photon reabsorption were studied. Operation of the detector for imaging at higher pressures with Kr and Xe mixtures is in progress.

Paper Details

Date Published: 5 June 2003
PDF: 12 pages
Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); doi: 10.1117/12.480001
Show Author Affiliations
Mustafa C. Altunbas, Univ. at Buffalo (United States)
Eugene Franklin Barasch, Univ. at Buffalo (United States)
Daniel R. Bednarek, Univ. at Buffalo (United States)
Stephen Rudin, Univ. at Buffalo (United States)

Published in SPIE Proceedings Vol. 5030:
Medical Imaging 2003: Physics of Medical Imaging
Martin J. Yaffe; Larry E. Antonuk, Editor(s)

© SPIE. Terms of Use
Back to Top