MRI magnet with fast ramp up capability for interventional imagi

Details MRI magnet with fast ramp up capability for interventional imagi MRI magnet with fast ramp up capability for interventional imagi

1997-08-21

2000-08-01

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324319, G01V 300

Patent

active

060971878

ABSTRACT:
Primary superconducting coils (50) generate a magnetic field through an examination region (10). Stabilizing coils (70) are magnetically coupled with the magnetic field generated by the primary coils. A primary persistence switch (60) and a stabilizing coils persistence switch (72) are opened when the primary coils are connected to a current source (62) to ramp-up the magnetic field. The persistence switches are closed, disconnecting the primary coils from the current source and connecting the primary coils and the stabilizing coils into closed loops. As the magnetic flux generated by the primary coils fluctuates as the primary coils stabilize, the changing flux induces currents in the stabilizing coils. The currents induced in the stabilizing coils generate an offsetting magnetic flux such that the net magnetic flux generated by the primary and stabilizing coils is held constant.

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Outlook Magnet Resonance Imaging System Product Data advertising brochure, Picker International, Dec. 1995.

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