An In Vivo Bone Densitometer for use with a Diagnostic X-Ray Set


An invivo bone densitometer has been designed to be used with a full wave rectified X ray set. The densitometer has been constructed to give a fast and accurate scan of the ulna with a spatial resolution very much better than hitherto achieved. The ulna was chosen so that a wide range of patients, who might have limited agility could be easily scammed for bone mineral content with a view to the early diagnosis of bone disease and to study progress and response to therapy. To overcome the X ray output fluctuations due to variations of the supply voltage, an electronic compensation technique using two detectors was developed. One of the detectors samples the total incident X ray intensity over a portion of the every half cycle, and the other the X ray intensity transmitted through the ulna. Tests to determine the performance of the compensation mechanism over a wide range of operating conditions were made, The reproducibility of the densitometer has been demonstrated by making scans using simulated dead and invivo bone. Theoretical calculations using a simplified theory have Been made to predict the accuracy of the compensation technique and the expected voltage signals. These calculations are compared with experimental observation.

Divisions: Aston University (General)
Additional Information: Copyright © Edwards, 1973. J.P.N Edwards asserts their moral right to be identified as the author of this thesis. This copy of the thesis has been supplied on condition that anyone who consults it is understood to recognise that its copyright rests with its author and that no quotation from the thesis and no information derived from it may be published without appropriate permission or acknowledgement. If you have discovered material in Aston Publications Explorer which is unlawful e.g. breaches copyright, (either yours or that of a third party) or any other law, including but not limited to those relating to patent, trademark, confidentiality, data protection, obscenity, defamation, libel, then please read our Takedown Policy and contact the service immediately.
Institution: Aston University
Uncontrolled Keywords: in vivo,bone densitometer,diagnostic,x-ray
Last Modified: 08 Dec 2023 08:02
Date Deposited: 13 Jan 2011 11:02
Completed Date: 1973
Authors: Edwards, John P.N.

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