Gradient driver control in magnetic resonance imaging

Details Gradient driver control in magnetic resonance imaging Gradient driver control in magnetic resonance imaging

1991-11-01

1993-07-13

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01V 300

Patent

active

052277283

ABSTRACT:
Electromagnet coil driving circuitry in a magnetic resonance imaging system is modified to include a flux-driven closed-loop real-time feedback control. The result is more accurate and efficient control of the net actual gradient flux generated by the coil even in the presence of magnetic circuit materials exhibiting hysteresis effects and/or electrical conductors giving rise to eddy current effects. Such driver control can be used to simultaneously correct the magnetic flux changes induced by environmental, ambient or other outside disturbances affecting the net magnetic field within a patient imaging volume of a magnetic resonance imaging system.

REFERENCES:
patent: 4612596 (1986-09-01), Fox
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patent: 4788502 (1988-11-01), Keller et al.
patent: 4829252 (1989-05-01), Kaufman
patent: 4885542 (1989-12-01), Yao et al.
patent: 4928063 (1990-05-01), Lampman et al.
patent: 4970457 (1990-11-01), Kaufman et al.
"Passive Screening of Switched Magnetic Field Gradients" by R. Turner et al.-J. Phys. E. Sci., Instrum 19 (1986).

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