Radiation therapy device with moveable aperture plate
US5019713A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 1990 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Apr 9, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N2005/1095
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In a radiation therapy device isodose curves are adjusted both by a movable plate that is controlled during the irradiation and by a non-movable filter body in the radiation path. The filter body is located in such a manner that it has decreasing absorbability in the opening direction of the plate. On the other hand, the plate produces a decreasing effective dose in its opening direction. by superimposing the two effects, it is possible to have the isodose curve in the object of irradiation rise or fall in the opening direction, so that a wide range of variation in the possible isodose curves is obtained, without having to change the fixed filter body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.