FIG 1. The hybrid 2D-CSI/1D-HSI sequence. A 25.6-millisecond 60-Hz CHESS sequence was followed by three 5.12-millisecond, dual-lobe, time-shifted 90+
i° (i = 17°, 10°, and 5° to compensate for partial fat T1 recovery) OVS pulses. The VOI was selectively excited by a TR/TE = 1600/135 PRESS sequence with its 5.12-millisecond 90° pulse as well as fourth-order HSI encoding under a 3 mTM-1 gradient. This was followed 27.5 and 100 milliseconds later by a 5.12-millisecond 180° RF pulse under 1 mTM-1. The 2D 16 x 16 CSI sequence was performed during the TE along the x and y axes.
