X-Ray Image Converter With Video-Signal Output

B. Driard; J. Ricodeau; H. Rougeot

doi:10.1117/12.965507

25 July 1979 X-Ray Image Converter with Video-Signal Output

B. Driard, J. Ricodeau, H. Rougeot

Proceedings Volume 0164, 4th European Electro-Optics Conf; (1979) https://doi.org/10.1117/12.965507
Event: Fourth European Electro-Optics Conference, 1978, Utrecht, Netherlands

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.

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B. Driard, J. Ricodeau, and H. Rougeot "X-Ray Image Converter with Video-Signal Output", Proc. SPIE 0164, 4th European Electro-Optics Conf, (25 July 1979); https://doi.org/10.1117/12.965507

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