Radiographic apparatus
US4118631A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1977 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Mar 25, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N2005/1054
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In therapeutic radiographic apparatus it is desirable to maintain the penetrating radiation in passing through tissue to be irradiated, rather than surrounding healthy tissue, despite movements of the patient. A shadowgraph radiographic picture of part of the patient is obtained by derivation from cross-sectional radiographic pictures from computerized axial tomography (CAT) apparatus. A similar shadowgraph picture is obtained, during therapy treatment, by collecting the therapy radiation after passing through the body. The two pictures are compared to determine the position of the therapy radiation relative to the tissue to be irradiated and the position is adjusted in response to the comparison.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.