SPINS is a non-selective pulse design based on a short 3D spiral k-space trajectory.

This tool allows you to produce a uniform excitation within a specified volume of interest and reduces the RF power deposition.

See below for references.

1. Malik SJ1, Keihaninejad S, Hammers A, Hajnal JV. Tailored excitation in 3D with spiral nonselective (SPINS) RF pulses. Magn Reson Med. 2012 May;67(5):1303-15.

SPINS implementation