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Proceedings Paper

X-Ray Image Converter With Video-Signal Output
Author(s): B. Driard; J. Ricodeau; H. Rougeot
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Paper Abstract

Imaging systems incorporating X-ray image-intensifier tubes are widely used in medicine and industry. The image quality given by these systems is comparable to that given by film/intensifier screen combinations. In conventional equipment, the optical coupling system between the intensifier and the image pickup and recording system can appreciably degrade the quality of the final image. The result is reduced contrast and sensitivity, loss in resolution, particularly towards the edges of the field, and vignetting. This equipment is also bulky and heavy, and prone to change in optical alignment with time. Even using fiber-optic coupling with a special vidicon is not the perfect solution, as fiber size can limit the resolution, and dead fibers cause blemishes. In this paper, we describe a new tube in which an electron-beam scanning section, similar in design to that of a vidicon, is incorporated into the intensifier. This beam reads out the charge-pattern image that is created on a silicon target by the photoelectrons. With this tube, doses on the order of 1 to 4 btR per image, and 100 to 300 µR per image are required for fluoroscopic and fluoro-graphic operation respectively. The limiting spatial resolution (5 % modulation), obtained by measurements with bar charts, is 32 lp.cm-1.

Paper Details

Date Published: 25 July 1979
PDF: 6 pages
Proc. SPIE 0164, 4th European Electro-Optics Conf, (25 July 1979); doi: 10.1117/12.965507
Show Author Affiliations
B. Driard, Thomson-CSF (France)
J. Ricodeau, Thomson-CSF (France)
H. Rougeot, Thomson-CSF (France)


Published in SPIE Proceedings Vol. 0164:
4th European Electro-Optics Conf

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