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System and method for reducing specific absorption rate in magnetization transfer magnetic resonance imaging

  • US 10,310,031 B2
  • Filed: 11/03/2016
  • Issued: 06/04/2019
  • Est. Priority Date: 11/03/2015
  • Status: Active Grant
First Claim
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1. A method for designing parallel transmission (pTx) radio frequency (RF) pulses for use in magnetic resonance imaging (MRI), the steps of the method comprising:

  • (a) selecting a plurality of resonance frequencies associated with a population of spins having a broad resonance frequency spectrum, wherein the population of spins is associated with a bound proton pool;

    (b) providing an RF transmission profile for each of a plurality of transmit channels associated with a multichannel RF coil array;

    (c) selecting a set of compressed specific absorption rate (SAR) matrices at which SAR can be evaluated;

    (d) designing a plurality of RF pulses for achieving a desired saturation of the population of spins by determining a set of RF waveforms that maximize power deposition to the population of spins at the selected resonance frequencies while minimizing an average local SAR of the plurality of RF pulses evaluated at the compressed SAR matrices, wherein the power deposition to the population of spins is determined based on the selected plurality of resonance frequencies and the RF transmission profiles.

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