Patent · US Expired

Detuning circuit for resonators in a nuclear magnetic resonance imaging apparatus

US5260658A · kind A · utility

28Cited by

1References

8Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Helmut Greim · Höchstadt an der Aisch, DE
Juergen Ruhl · Erlangen, DE
Ralph Oppelt · Uttenreuth, DE

Key dates

Filing date	Dec 5, 1991
Grant date	Nov 9, 1993
Priority date	—
Expiry date	Dec 5, 2011

Classification

Technology area (CPC G)Physics
CPC primaryG01R33/3628
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A circuit for detuning a resonator in a nuclear magnetic resonance imaging apparatus has an output connected to a terminal of the resonator via a high-frequency line composed of two conductors. The resonator is shortened at this terminal with a shorting capacitor that can be short-circuited for detuning the resonator. The length of the high-frequency line is shorter than one-fourth of the wavelength of a high-frequency signal having the operating frequency of the nuclear magnetic resonance imaging apparatus on the high-frequency line. For detuning the resonator the high-frequency line can be terminated at the output with a further capacitor, so that the high-frequency line acts as a short-circuit at the terminal.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.