Abstract #3763
RF Amplifier Nonlinearity Correction for Multiband RF Pulses
Kangrong Zhu 1 , Robert F Dougherty 2 , Matthew J Middione 3 , Hua Wu 2 , Greig Scott 1 , John M Pauly 1 , and Adam B Kerr 1
1
Electrical Engineering, Stanford University,
Stanford, CA, United States,
2
Center
for Cognitive and Neurobiological Imaging, Stanford
University, Stanford, CA, United States,
3
Applied
Sciences Laboratory West, GE Healthcare, Menlo Park, CA,
United States
Multiband RF pulses are more likely to incur RF system
nonlinearities than standard RF pulses because they
typically push B1 to the RF amplifier limit and their
envelope requires rapid RF supply current changes.
Nonlinear distortion on a multiband RF pulse results in
undesired higher harmonics being excited in the
frequency domain. In this work, an RF pre-distortion
approach, which compensates for the error between
desired and measured RF waveforms, is adapted to
mitigate the nonlinear distortion on multiband RF
pulses.
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