Radiographic image processing method and photographic imaging apparatus therefor
US5132998A · kind A · utility
38Cited by
5References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1990 |
| Grant date | Jul 21, 1992 |
| Priority date | — |
| Expiry date | Mar 1, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/4241
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Transmission images are obtained by radiating X-rays having two different energy levels onto a subject in one direction, and then transformed into logarithmic images, respectively. From these logarithmic images, a contrast ratio due to the two kinds of X-rays having different energies is obtained. From this contrast ratio, the term relating to the thickness of the subject is eliminated, thereby providing information only relating to the quality of the material. By collating the information with the previously measured data of materials, the material of the subject is identified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.