Energy difference image processing method
US5396530A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1993 |
| Grant date | Mar 7, 1995 |
| Priority date | — |
| Expiry date | Oct 15, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2211/408
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An energy difference picture processing method comprises the steps of using a semiconductor radiation detector; providing two discriminating levels; dividing X-rays, which have passed through objects, into two kind energy zones; counting X-ray photons to obtain an X-ray picture; assembling, with corresponding coefficients, S(H), S(L), {S(H)}.sup.x and {S(L)}.sup.y, which are exponential functions of the S(H) and S(L), respectively, where S(H) is a logarithmically converted version of a picture of counts in a higher energy band and S(L) is a logarithmically converted version of a picture of counts in a lower energy band; and performing addition, subtraction, multiplication and/or division on these terms to provide a picture in which a particular one of the materials constituting the objects is selectively extracted or removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.