Optical decoupling, tuning and shimming of magnetic resonance coils
US7714578B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 13, 2006 |
| Grant date | May 11, 2010 |
| Priority date | — |
| Expiry date | Mar 13, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3642
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic resonance imaging system (10) includes a transmit coil (22) and one or more receive coils (32). The transmit coil includes one or more circuit segments (44, 44, 80, 90) including a light-sensitive metal-insulator-semiconductor capacitor (50) which is connected by an optic fiber to one of a plurality of variable light sources (68). In the set-up mode, the transmit coil transmits RF pulses into an examination region (14). A plurality of the receive coils are disposed around the imaging region. The tuning processor (60) analyzes the received RF fields from around the imaging region and determines adjustments to the amount of light transmitted to each light-sensitive capacitor to shim or tune the transmit coil to optimize RF field homogeneity. Further, the receive coils (32) include a light-sensitive capacitor whose illumination is changed during RF transmission to detune the receive coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.