RF encoding using the Bloch-Siegert shift has the potential to replace conventional gradient encoding with cheaper RF gradients, and can directly replace gradient pulsing in common MRI sequences. However, current implementations require large frequency offsets to prevent on-resonance excitation, which subsequently requires high RF power for encoding as well as separate imaging and encoding RF coils. Here we show that frequency-swept encoding RF pulses enable the use of a single RF coil for imaging and encoding since the frequency offset can be brought much closer to resonance.
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