Figure 1.

The dual inversion recovery UTE (DIR UTE) pulse sequence for imaging short-T2 species. The combination of half pulse excitation and radial ramp sampling allows a short TE of 8 μs. Two half RF excitations with opposite slice selection gradient polarity are required for each readout to form a complete slice profile. The long-T2 water and fat signals are inverted and nulled by two long duration adiabatic inversion pulses, with one centered on the water peak and one on the fat peak.