RF-safe interventional or non-interventional instrument for use in an MRI apparatus
US9835697B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 2012 |
| Grant date | Dec 5, 2017 |
| Priority date | — |
| Expiry date | Oct 3, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/288
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An RF-safe interventional or a non-interventional instrument is used during an MR imaging or MR examination of an examination object (A). The instrument is made of or includes at least one longitudinal or elongated electrically conductive element (1, 3), for example, in the form of a conductor or wire or line for feeding electrical signals, or in the form of the instrument itself or a component or a part thereof, which is not provided for feeding electrical signals but is nevertheless electrically conductive. All such elements are subject to RF common mode currents which are induced in the element when the instrument or element is exposed to an RF/MR excitation field generated during MR imaging or MR examination by an MR imaging apparatus. The instrument is made RF-safe by increasing the energy loss of an oscillator which is represented by the conductor (1, 3) by a damping element (4; 6) in order to prevent or limit RF heating of the examination object (A) at or surrounding the conductor (1, 3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.