Title: Tomography

Abstract: Computerized axial tomographic apparatus provides sets of "edge readings" which relate to the absorption suffered by penetrative radiation on traversing respective paths through a part of interest in a body, the various paths being coplanar. These edge readings are processed to permit the evaluation of the absorption coefficients at a plurality of locations distributed over the part of the body in the irradiated plane. In accordance with the invention the necessity for such processing to involve large scale multiplication is overcome by employing a processing technique which utilizes Walsh functions.

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Inventors: Mayo, Bernard Joseph (Beaconsfield, EN)
Best, John Edward (near Reading, EN)

Application Number: 621027
Filing Date: 1975-10-09
Publication_date: 1977-06-28
Assignee: E M I Limited (Hayes, EN)
Primary Class(es): 378/51 378/901
Other Classes:
US Patent Ref:

3778614	Dec, 1973	Hounsfield	250/445.
3784820	Jan, 1974	Miraldi	250/362.
3852603	Dec, 1974	Muehllehner	250/369.
3875412	Apr, 1975	Hozumi	250/446.
3919552	Nov, 1975	Hounsfield	250/445.
3924131	Dec, 1975	Hounsfield	250/445.
3934142	Jan, 1976	Hounsfield	250/445.
3936636	Feb, 1976	Percival	250/369.
3996467	Dec, 1976	Froggatt et al.	250/445.

Other Refs:
Primary Examiner: Morrison, Malcolm A.
Assistant Examiner: Krass, Errol A.
Attorney: Fleit & Jacobson