Abstract #1881

Multi-Band Slice-Selective and 2D-Selective RF Excitations with Band-Specific Dephasing Moments for Tailored z-Shimming

Jürgen Finsterbusch¹

¹Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany

T2*-weighted acquisitions used for functional neuroimaging can suffer from through-slice dephasing. Additional, so-called z-shim gradient pulses can be applied in the slice direction to minimize related signal losses. Thereby, a single, slice-specific gradient moment may be sufficient for small target regions like the spinal cord. To combine this z-shimming approach with multi-band acceleration, the individual bands must provide different dephasing moments in the slice direction. This can be realized with appropriate temporal shifts of the individual envelopes as is demonstrated for conventional slice-selective RF excitations and 2D-selective RF excitations for inner-field-of-view imaging.

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