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British Journal of Radiology (1981) 54, 232-240
© 1981 British Institute of Radiology
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The British Journal of Radiology, Vol 54, Issue 639 232-240, Copyright © 1981 by British Institute of Radiology

ARTICLES

A survey of 29 EMI CT machines in Britain

RD Speller, DR White, R Veerappan, AJ Coleman and PE Waller

During 1978/79 a survey was made of the performance characteristics of 29 EMI brain and body CT scanners in Britain. Comparative data on such performance parameters as noise, uniformity of CT numbers, low-contrast detectability, resolution, modulation transfer function (MTF) and effective photon energy were measured using a set of regular-geometry and anthropomorphic phantoms. In addition, dose profiles were obtained for a single slice using TLD and film. The results of the survey are presented; the dependence of the performance characteristics on the types of machines surveyed and the operating modes employed is discussed.




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