Detection of ferromagnetic objects approaching a magnet
US7414400B2 · kind B2 · utility
4Cited by
13References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 15, 2003 |
| Grant date | Aug 19, 2008 |
| Priority date | — |
| Expiry date | Jun 2, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/288
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for detecting a potentially dangerous ferromagnetic object carried inadvertently by a person approaching the magnet of a magnetic resonance imaging system (14) uses the fringe field (16) of the magnet and provides guide members (11) defining a path along which the person is prescribed to pass. The path (11) is generally or approximately parallel to the field the path. At least one sense coil and generally two sets of sense coils (12, 13) are located on respective sides of the path (11) s the movement of the ferromagnetic object in the field of the magnet causes a voltage to be generated in the sense coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.