Magnetic resonance apparatus comprising an improved gradient sys

Details Magnetic resonance apparatus comprising an improved gradient sys Magnetic resonance apparatus comprising an improved gradient sys

1995-07-19

1996-11-05

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01V 300

Patent

active

055721338

ABSTRACT:
A magnetic measurement apparatus includes a magnet system (1) for generating a steady magnetic field in a measurement space (35), a gradient coil system (3) for generating gradient fields in the measurement space, and a number of gradient amplifiers (9) with input terminals (38) which are connected to means (7) for generating an input signal exhibiting a predetermined variation as a function of time. The output terminals (39) of at least one of the gradient amplifiers (9) are connected to an output circuit which comprises a series connection of a gradient coil (3) and at least one capacitor (55). The output circuit also includes a transformer (41) with a primary winding (43) and a secondary winding (45), the primary winding being connected to the output terminals (39) of the gradient amplifier (9), the secondary winding constituting a series resonant circuit in conjunction with the gradient coil (3) and the capacitor. The current through the gradient coil (3) and the voltage across this coil can thus be substantially higher than the output current and the output voltage of the gradient amplifier (9).

REFERENCES:
patent: 5063349 (1991-11-01), Roemer et al.
patent: 5079503 (1992-01-01), Siebold et al.
patent: 5245287 (1993-09-01), Nowak et al.

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