Method for the operation of an automatic x-ray exposure unit
US5485501A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 10, 1994 |
| Grant date | Jan 16, 1996 |
| Priority date | — |
| Expiry date | Aug 10, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05G1/44
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An x-ray examination installation includes an x-ray source for irradiating an examination subject with x-rays, and an automatic exposure unit having a radiation detector composed of a matrix of detector elements. Only the output signals of specified detector elements, which define the measuring field within which an optimum exposure should ensue, are utilized for generating a signal which is then supplied to the x-ray source for controlling the exposure dose. The automatic exposure unit is operated according to a method wherein a distribution of the grayscale values in a test image is first calculated, and subsequently the main image is produced with the previously-calculated distribution of grayscale values superimposed in the main image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.