Quadrature surface coils for magnetic resonance imaging

Details Quadrature surface coils for magnetic resonance imaging Quadrature surface coils for magnetic resonance imaging

1988-08-19

1990-04-17

Williams, Hezron E.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

128653R, G01R 3320

Patent

active

049183885

ABSTRACT:
A thin dielectric sheet (36) has a first or loop coil (30) defined on one surface thereof and a second or Helmholtz coil (32) defined on an obverse surface thereof. The dielectric sheet and associated coils may be laid flat (FIG. 3) or bent to match a selected curved surface of the subject (FIGS. 6-8). The first and second coils are arranged symmetrically about an axis or plane of symmetry (34). The first coil has an associated magnetic field along a y-axis and the second coil has an associated magnetic field along the x-axis. Circuits (40 and (42) tune the first and second magnetic resonance coils to a preselected magnetic resonance frequency. Magnetic resonance signals of the selected frequency received by one of the coils are phase shifted 90.degree. by a phase shifting circuit (50) and combined with the unphase shifted signals from the other coil by a combining circuit (52). The combined signals are amplified (54) and conveyed to electronic image processing circuitry (E) of a magnetic resonance scanner.

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