Automatic tuning circuit for magnetic resonance quadrature antenna system
US4763074A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 1, 1987 |
| Grant date | Aug 9, 1988 |
| Priority date | — |
| Expiry date | Apr 1, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3678
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An automatic tuning circuit for a quadrature coil antenna system of a magnetic resonance imaging system is provided which includes a test coil for applying a test signal to each of a first and a second channel of the antenna to produce a first channel signal on the first channel and a second channel signal on the second channel. A phase meter assembly is coupled to the first and second antenna channels for measuring the phase of the second channel signal relative to the phase of the first channel signal to obtain an error signal. An auto-tune assembly is coupled to the phase meter assembly and to the second antenna channel for adjusting the phase of the second channel signal in response to the error signal to obtain a desired phase relationship between the first and second channel signals. The invention also includes a method for automatically tuning a quadrature coil antenna system of a magnetic resonance imaging system which includes a first step of applying a test signal having a selected magnetic field polarization vector to the first and second antenna channels to produce the first channel signal on the first antenna channel and the second channel signal on the second antenna …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.