Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2006-09-26
2006-09-26
Gutierrez, Diego (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
Reexamination Certificate
active
07112964
ABSTRACT:
A method of measuring and correcting eddy currents in a MRI system includes running a pulse sequence using bipolar gradient pulses and a first delay Te, to acquire a phase-difference image and a phase response of a static phantom that fills a majority of a field of view (FOV) of the MRI system, fitting the phase difference image to a two-dimensional second order polynomial, and changing the pulse sequence to provide a different delay. The method includes iterating running a pulse sequence and fitting the phase difference image and phase response with different delays to determine coefficients of the second order polynomial and a time constant of the phase response, correcting a pre-emphasis eddy current correction (ECC) system of the MRI system in accordance with the time constant of the phase response, determining an amplitude correction to reduce determined coefficients, and storing determined amplitude corrections in the pre-emphasis ECC system.
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King Kevin Franklin
Zhou Yong
Armstrong Teasdale LLP
Fetzner Tiffany A.
General Electric Company
Gutierrez Diego
Horton Esq. Carl B.
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