Use of bisecting angle techniques in veterinary orthopaedic radiography

Hammond, Gawain J.C (2006) Use of bisecting angle techniques in veterinary orthopaedic radiography. MVM(R) thesis, University of Glasgow.

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Abstract

Problems encountered in veterinary orthopaedic radiography include difficulties obtaining optimally positioned radiographs. In these situations, compromise radiographic projections are used to obtain the necessary clinical information. Results of investigations into the use of bisecting angle radiographic techniques for imaging canine long bones are presented. Comparisons are made between radiographs made using ideal positioning and using three different compromise techniques, including bisecting angle projections. The use of bisecting angle techniques in a series of ten clinical cases is also discussed. A study into the radiographic images obtained of canine femora and humeri using an ideal projection technique (with the long axis of the bone parallel to the cassette) and using three techniques when the bone was at an angle to the cassette (beam perpendicular to cassette, beam perpendicular to bone and bisecting projection) demonstrated that the ideal radiographic technique gave the most accurate image of the bone in terms of reproduction of size and proportions. However, of the three angled techniques, the bisecting angle projection gave the most accurate reproduction of proportions at all bone-cassette angles. All angled projections created a size distortion, and at lower bone-cassette angles, this was lowest when the primary X-ray beam was perpendicular to the cassette. At higher bone-cassette angles, this projection was no more accurate at reproducing bone size than the bisecting projection. A subjective assessment demonstrated that maintenance of the radiographic appearance of the trabecular bony detail was best with the ideal projection, followed by the angled projection with the tube perpendicular to the cassette. In 10 clinical cases, where the required information (e.g. implant placement or post-operative progression) could not be adequately obtained from standard radiographic projections, use of the bisecting angle technique allowed the area of interest to be examined more completely. Use of bisecting angle techniques for veterinary orthopaedic investigations could be considered where optimal positioning for radiography is not possible.

Item Type: Thesis (MVM(R))
Qualification Level: Masters
Additional Information: Adviser: Martin Sullivan
Keywords: Veterinary science, Medical imaging
Date of Award: 2006
Depositing User: Enlighten Team
Unique ID: glathesis:2006-71075
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 10 May 2019 10:49
Last Modified: 10 May 2019 10:49
URI: http://theses.gla.ac.uk/id/eprint/71075

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