Tomography apparatus and method
US4598369A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 1983 |
| Grant date | Jul 1, 1986 |
| Priority date | — |
| Expiry date | May 2, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2223/612
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Tomographic images are obtained at a plane of interest by taking a series of x-ray exposures, producing a series of multiple images therefrom, arranging these multiple images so that points residing within a desired plane of interest are coincident to form a first order clarified image, repeating the step for a predetermined number of other planes which are parallel to the first plane of interest, to produce a first order clarified image for each of these planes, and then producing a smeared image for each of such planes, except one, by replicating the first order image for said plane a predetermined number of times and shifting each of the replicated images in the plane as a function of the distance between that particular plane and the x-ray source, the distance between that particular plane and the x-ray image device, the same distances but taken relative to a plane of interest, and the distance moved between exposures by the x-ray source. This smeared image for each particular plane is then multiplied by a coefficient and subtracted from the first order image of the plane of interest to form a second order clarified image of the plane of interest.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.