Design of a Variable-Rate Selective Dual-Band FOCI Pulse for Spin Labeling

For pulsed arterial spin labeling (ASL) the quality of the slice-selective inversion is decisive because of the inherent low perfusion contrast. Commonly, adiabatic inversion pulses are used. However, the adiabatic condition has to be fulfilled, leading to a compromise between the maximum available coil voltage and profile quality, i.e. pulse parameters. Especially the high RF power demand of adiabatic dual-band inversion pulses normally leads to inversion profiles that are unusable for ASL. We present a dual-band FOCI inversion pulse with reduced RF power requirements that conserves the high quality of a single-band FOCI pulse.

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