Imaging ionization chamber for medical application with synchrotron radiation

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

doi:10.1117/12.180025

12 July 1994 Imaging ionization chamber for medical application with synchrotron radiation

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

Author Affiliations +

Proceedings Volume 2278, X-Ray and UV Detectors; (1994) https://doi.org/10.1117/12.180025
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

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.

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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, and Wolfram Kupper "Imaging ionization chamber for medical application with synchrotron radiation", Proc. SPIE 2278, X-Ray and UV Detectors, (12 July 1994); https://doi.org/10.1117/12.180025

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