Time-based attenuation compensation
US5400384A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1994 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | Jan 25, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05G1/46
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus employed in an X-ray apparatus for compensating for attenuation caused by a subject to perform an improved X-ray exposure. A table is created comprising entries accessible via power and attenuation values. Each of the entries includes a first value T representing a time for radiation in the system to reach a base ion count, and a second value C representing an offset ion count from the base ion count. A first set of entries in the table are referenced using a first power setting, and a first base ion count is determined based upon the first power setting, and a maximum radiation exposure is determined for the first power setting and a subject's mass. Then, an X-ray emitter is activated until a current ion count from a radiation sampling means has exceeded the base ion count or total radiation emitted has exceeded the maximum radiation allowed for the given mass of a subject. If the current radiation has exceeded the maximum radiation, then the X-ray emitter is deactivated and the process terminates. If the current ion count from the radiation sampling means has exceeded the base ion count, then it is determined whether the base ion count has been offset. If s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.