Many techniques for achieving spatial localization of an composite pulses that suppress all harmonic excitations up NMR signal have been proposed for use in both in vivo to 15B nom 1 and investigate their off-resonance performance. NMR and magnetic resonance imaging. In a recent paper, As described by Baum et al. (11), any composite 180Π Scheffler has revived the idea of using a ''B 1 -selective pulse that inverts equilibrium magnetization over a broad pulse'' for this purpose (1). A B 1 -selective pulse may be range of values of the radiofrequency field strength can be defined as one which achieves spatial localization (i) in a adapted for use as a B 1 -selective 90Π pulse. The argument ''single-shot'' experiment and (ii) using only the inherent runs as follows: when the B 1 field strength is zero, the equiradiofrequency field (B 1 ) gradient produced by, say, a surlibrium magnetization remains unperturbed and no transverse magnetization is excited; when B 1 lies in the range face coil. Localization methods which use static magnetic field (B 0 ) gradients (2, 3) or phase cycling (4-11) to sup-(B nom 1 0 DB 1 ) Β£ B 1 Β£ (B nom