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A comparative survey of multi-directional tomographic units.

Abstract There are presently available in the United Kingdom six different X-ray machines capable of multi-directional tomography. A comparative assessment of the units and their performance was made with particular emphasis on (i) the suitability of the units as general purpose instruments, for routine radiography and the wide range of tomographic examinations required in a district general hospital; (ii) the performance of the most sophisticated machines, in the demonstration of small ear structures. The quality of the pictures obtained, the radiation dose to the patient and ease of operation by specialist or inexperienced radiographers were considered. Hypocycloidal and tri-spiral tube movements gave the most uniform blurring, free from “streaking” and false images, and hence were the best for thin section ear tomography. There was no significant difference in the quality of the image produced by the Polytome and Stratomatic. In this investigation the Polytome produced a thinner section (0.6 mm) than t...