Patent · US Expired

Quadrature combiner

US4833429A · kind A · utility

9Cited by
4References
6Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 17, 1988
Grant dateMay 23, 1989
Priority date—
Expiry dateMay 17, 2008

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01R33/3678
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A quadrature coil combiner for phase shifting the pulses and signals of a quadrature coil system used in magnetic resonance (MR) systems to selectively combine or cancel the pulses and signals transmitted and received. The combiner comprises a first and a second conductor for coupling a first and a second coil respectively of the quadrature coil system to a transmit-receive circuit of the MR system. The first conductor comprises an insertable .pi./2 radian delay. The second conductor includes a fixed .pi./2 radian delay. At least one of either the fixed delay or the insertable delay is a quarter wavelength cable whereby active elements are minimized.

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