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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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