Simultaneous multislice (SMS) imaging accelerates data acquisition by exciting several slices simultaneously but has a higher specific absorption rate (SAR) due to additional radiofrequency (RF) pulses required to excite multiple frequencies. Multiphoton excitation achieved by oscillating gradient fields provides frequency sidebands, eliminating the need for additional excitation pulses. We have demonstrated SMS imaging for multiphoton MRI and used SENSE reconstruction to separate simultaneously acquired slices with the help of coil sensitivity profiles. Multiphoton SMS images achieve a similar quality to standard one-photon SMS images but offer the benefit of reduced SAR as they do not require extra RF power.
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