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An X-ray scanner based on an "edge on" illuminated capillary plate combined with a gas amplification structure
KTH, Superseded Departments, Physics.
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2004 (English)In: 2004 IEEE Nuclear Science Symposium Conference Record, 2004, 489-492 p.Conference paper (Refereed)
Abstract [en]

We have developed and successfully tested a prototype of a new type of high position resolution X-ray scanner. It contains a thin wall lead glass capillary plate converter of X-rays combined with a microgap parallel-plate avalanche chamber operating in various gas mixtures at 1 atm. The operation of these converters was studied in a wide range of X-ray energies (from 6 to 60 keV) at incident angles varying from 0-90°. The detection efficiency, depending on the geometry, photon's energy, incident angle and the mode of operation, was between 5-30% in a single step mode and up to 50% in a multi-layered combination. Depending on the capillary's geometry, the position resolution achieved was between 50-250 μm in digital form and was practically independent of the photon's energy or gas mixture. The usual lead glass capillary plates operated without noticeable charging up effects at counting rates of 50 Hz/mm2, and hydrogen treated capillaries up to 10 5 Hz/mm2. Finally, a prototype of the X-ray scanner based on an "edge-on" illumination capillary plate was built and tested. The developed detector open new possibilities for medical imaging, for example in mammography, portal imaging, radiography (including security devices), crystallography and many other applications.

Place, publisher, year, edition, pages
2004. 489-492 p.
, IEEE Nuclear Science Symposium Conference Record, ISSN 1095-7863
Keyword [en]
Capillarity, Hydrogen, Medical imaging, Mixtures, Photons, X rays, Capillary plates, Gas mixtures, Photon energy, Test chambers, Amplification
National Category
Medical Engineering
URN: urn:nbn:se:kth:diva-157303ISI: 000232002100101ScopusID: 2-s2.0-23844463194OAI: diva2:771026
2004 Nuclear Science Symposium, Medical Imaging Conference, Symposium on Nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors, 16 October 2004 through 22 October 2004, Rome, Italy

QC 20141212

Available from: 2014-12-12 Created: 2014-12-08 Last updated: 2014-12-12Bibliographically approved

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