The process of computerised tomography (CT) has been developed for medical imaging purposes using a variety of X-ray scannars. So far, little attention has been paid to industrial applioaticns of this technique, largely because of the constraints of expense. An investigation was made of the suitability of one medical scanner, the EMI CT5005, as an industrial scanning tool. This showed up a variety of problems when scanning non-medical objects, and suggested an alternative approach to the problem. This was to construct an experimental scanner based on gamma-ray sources, to overcome the problems of beam hardening,, and provide versatility and, perhaps, portability. The greatest limitation on this sort of device is the time needed to produce a scan. However, even with small laboratory sources it seemed possible to produce a usable scanner. This experimental scanner was constructed and developed to the stage of producing very acceptable images, albeit of moderate resolution. This thesis outlines the basic theory of reconstructing images using CT, and describes the considerations leading to the development of the experimental scanner. The scanner itself is described, along with details of control, data processing, and the problems encountered. The statistical limitations on the scanner are described, and the way these affect the quality of the final CT image is investigated in detail. A variety of applications of the scanner are suggested, both in its present form and with foreseeable development, and a catalogue of the scans obtained using the scanner is provided.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:255711 |
| Date | January 1981 |
| Creators | Foster, John |
| Publisher | University of Surrey |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://epubs.surrey.ac.uk/776188/ |
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