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Proceedings Paper

Imaging ionization chamber for medical application with synchrotron radiation
Author(s): Hans-Juergen Besch; U. Grossmann; R. Langer; Hermann W. Schenk; Albert Heinrich Walenta; Wolf-Rainer Dix; Joachim Heuer; Walter Graeff; G. Illing; Michael Lohmann; Ralf-Hendrik Menk; L. Schildwaechter; U. Tafelmeier; Wolfram Kupper
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Paper Abstract

A position-sensitive 1D x-ray detector with large dynamic range (> 214:1) for high photon fluxes with fast image recording sequence has been developed for noninvasive subtraction coronary angiography. Detailed investigations of the basic physical processes in the detector allow the quantitative description of the important detector performance parameters. As an example a detector with a position resolution of 430 micrometers FWHM and a detective quantum efficiency (DQE) of at least 58% (for 20,000 photons/pixel) for 33 keV photons in a XeCO2 gas mixture at 20 bars is described. A procedure has been developed for determination of the DQE from the data. Investigations at high beam intensities showed that only at a flux above 2.4 1010 photons/s pixel saturation effects become apparent. These observations are quantitatively explained by a newly developed dynamic ion chamber model. Recently a number of noninvasive angiographies from patients of diagnostic quality were obtained at HASYLAB, DESY.

Paper Details

Date Published: 12 July 1994
PDF: 9 pages
Proc. SPIE 2278, X-Ray and UV Detectors, (12 July 1994); doi: 10.1117/12.180025
Show Author Affiliations
Hans-Juergen Besch, Univ. Siegen (Germany)
U. Grossmann, Univ. Siegen (Germany)
R. Langer, Univ. Siegen (Germany)
Hermann W. Schenk, Univ. Siegen (Germany)
Albert Heinrich Walenta, Univ. Siegen (Germany)
Wolf-Rainer Dix, HASYLAB at DESY (Germany)
Joachim Heuer, HASYLAB at DESY (Germany)
Walter Graeff, HASYLAB at DESY (Germany)
G. Illing, HASYLAB at DESY (Germany)
Michael Lohmann, HASYLAB at DESY (Germany)
Ralf-Hendrik Menk, HASYLAB at DESY (Germany)
L. Schildwaechter, HASYLAB at DESY (Germany)
U. Tafelmeier, HASYLAB at DESY (Germany)
Wolfram Kupper, Hospital for Cardiology (Germany)

Published in SPIE Proceedings Vol. 2278:
X-Ray and UV Detectors
Richard B. Hoover; Mark W. Tate, Editor(s)

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