Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1988-12-05
1990-03-20
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324300, G01R 3320
Patent
active
049104608
ABSTRACT:
A method of mapping eddy currents in magnetic resonance imaging apparatus of the type having gradient coils and RF coils, the method including the steps of (a) applying a pulse sequence to the apparatus in a first excitation stage, including the steps of applying a first test gradient of a first polarity by the gradient coils; subsequently applying a first RF pulse of the first polarity by the RF coils; subsequently applying at least one first imaging gradient by the gradient coils; (b) measuring a first output signal in the first stage in response to the RF excitation pulse and the gradients; (c) subsequently applying a pulse sequence to the apparatus in a second excitation stage, including the steps of subsequently applying a second test gradient of a second polarity opposite to the first polarity by the gradient coils; subsequently applying a second RF pulse of the second polarity; subsequently applying at least one second imaging gradient by the gradient coils; (d) measuring a second output signal in the second stage in response to the second RF excitation pulse and the second gradients; and (e) processing the first and second output signals to produce a map of the eddy currents.
REFERENCES:
patent: 4701706 (1987-10-01), Haacke
Tokar Michael J.
University of Medicine & Dentistry of New Jersey
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