US 12,189,014 B2
Eddy current mitigation systems and methods
Hadrien A. Dyvorne, New York, NY (US); Cedric Hugon, Guilford, CT (US); Rafael O'Halloran, Guilford, CT (US); and Laura Sacolick, Guilford, CT (US)
Assigned to Hyperfine Operations, Inc., Guilford, CT (US)
Filed by Hyperfine Operations, Inc., Guilford, CT (US)
Filed on May 22, 2023, as Appl. No. 18/321,708.
Application 18/321,708 is a continuation of application No. 16/994,005, filed on Aug. 14, 2020, granted, now 11,698,430.
Claims priority of provisional application 62/887,212, filed on Aug. 15, 2019.
Prior Publication US 2023/0324489 A1, Oct. 12, 2023
Int. Cl. G01R 33/565 (2006.01); G01R 33/44 (2006.01); G01R 33/58 (2006.01)
CPC G01R 33/56518 (2013.01) [G01R 33/58 (2013.01); G01R 33/445 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of operating a magnetic resonance imaging (MRI) system, the MRI system including at least one radio frequency (RF) coil configured to apply an RF signal in accordance with a pulse sequence, the pulse sequence comprising a gradient waveform associated with a target gradient field and an RF waveform associated with a target RF signal, the method comprising:
compensating for a presence of eddy currents during operation of the MRI system at least in part by correcting the RF waveform to obtain a corrected RF waveform, the correcting comprising:
determining a shifted B0 magnetic field strength waveform based on a corrected gradient waveform obtained at least in part by applying a first nonlinear function of a characteristic of the gradient waveform to the gradient waveform; and
correcting the RF waveform using the shifted B0 magnetic field strength waveform to obtain the corrected RF waveform; and
operating the MRI system in accordance with the corrected RF waveform to generate the target RF signal.