Multiple tap gradient field coil for magnetic resonance imaging

Details Multiple tap gradient field coil for magnetic resonance imaging Multiple tap gradient field coil for magnetic resonance imaging

1992-12-11

1994-05-10

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01V 300

Patent

active

053111354

ABSTRACT:
An NMR imaging system includes an apparatus for producing a magnetic field gradient within an imaging volume into which the object being imaged is placed. The relatively linear region of the magnetic field gradient is adjusted depending upon the size of the object. The apparatus comprises a source of a gradient signal and four saddle coils positioned in quadrant of a sheet that is wrapped around a cylindrical form. Each saddle coil has a spiral shaped conductive pattern on which are located a primary termination point and a pair of secondary termination points. A switch mechanism connects the four saddle coils in series with the source of a gradient signal, so that voltage from the gradient signal is applied between the primary termination point and a selected secondary termination point of each saddle coil. A control signal applied to the switch mechanism indicates selected secondary termination point and the signal varies according to the size of the object.

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