Patent · US Expired

Method for matching antennas in a nuclear magnetic resonance imaging apparatus

US5208537A · kind A · utility

29Cited by

2References

16Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Norbert Rietsch · Dormitz, DE
Markus Vester · Koblenzer Straße, DE
Horst Kroeckel · Bamberg, DE

Key dates

Filing date	Nov 6, 1991
Grant date	May 4, 1993
Priority date	—
Expiry date	Nov 6, 2011

Classification

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

Abstract

In a method for matching a transmission/reception antenna in a nuclear magnetic resonance imaging apparatus to the impedance of a high-frequency system which feeds the antenna, a directional coupler is used for acquiring respective signals corresponding to a forward voltage wave supplied to the antenna, and the associated return voltage wave. The amplitudes of the forward and return waves are calculated in a controller for all matching conditions of a transformation network, the transformation network being interconnected between the high frequency system and the antenna. When a tomogram is to be produced, the transformation network is set so that the antenna is matched as best as is possible to the high-frequency system. The same method can be used for matching an antenna which is only used for reception when producing tomograms.

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