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Proceedings Paper

Fast line scan x-ray detector for medical applications: a status report of the NIKOS II detector
Author(s): Michael Lohmann; Wolf-Rainer Dix; Klaus Engelke; Walter Graeff; Joachim Heuer; Wolfram Kupper; Thomas Moechel; Reinhold Reumann
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Paper Abstract

This contribution describes the development of a fast two line scan detector for digital subtraction angiography (DSA). For each line an input phosphor screen, an image intensifier and a photodiode array are successively coupled by a special fiber optic. A line comprises 250 pixels having a size of 0.5 .0.5mm2 each. The vertical center to center distance of the two input lines is 2mm. Different materials for the phosphor lines such as Gd2O2S : Tb and CdWO4 were tested. The 3 stage proximity focusing image intensifiers have a light intensity amplification of 120W/W. Fast readout electronics enable a minimum integration time of 2ms for the photodiode array. For this time the measured dynamic range of the detector is 3000. It can be improved by increasing the readout time. Details of the existing detector will be given. The tested detector was optimized for the application in non-invasive coronary angiography with synchrotron radiation (System NIKOS II). However, its modular design permits an optimization for other applications as well. By individual selection of the detector components, for example the spatial resolution and the shape of the input line can be adapted to specific problems.

Paper Details

Date Published: 1 May 1990
PDF: 7 pages
Proc. SPIE 1245, Biomedical Image Processing, (1 May 1990); doi: 10.1117/12.19549
Show Author Affiliations
Michael Lohmann, Univ.-Krankenhaus Eppendorf (Germany)
Wolf-Rainer Dix, HASYLAB at DESY (Germany)
Klaus Engelke, Univ.-Krankenhaus Eppendorf (Germany)
Walter Graeff, HASYLAB at DESY (Germany)
Joachim Heuer, HASYLAB at DESY (Germany)
Wolfram Kupper, Univ.-Krankenhaus Eppendorf (Germany)
Thomas Moechel, Univ. Hamburg (Germany)
Reinhold Reumann, HASYLAB at DESY (Germany)

Published in SPIE Proceedings Vol. 1245:
Biomedical Image Processing
Alan Conrad Bovik; William E. Higgins, Editor(s)

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