SPATIAL LOCALIZATION COMBINING PROJECTION PRESATURATION WITH A 2-DIMENSIONAL EXCITATION PULSE

Single-shot spatial localization of short T-1 nuclei was achieved by o uter volume suppression with projection presaturation followed by sele ctive excitation of the desired volume with a two-dimensional (2D) pul se, After the projection, presaturation with a 2D pulse avoided signal contamination from magnetization regrowth in the outer volume, wherea s preceding the 2D pulse with projection presaturation reduced any unw anted excitation in the outer volume caused by the 2D pulse. The impro vement in outer volume suppression achieved by combining these two tec hniques was demonstrated by images collected after the application of projection presaturation alone, a 2D pulse alone, and the two combined .