By applying magnetic field gradients to alkali vapor cells, images of
the spatial distribution of spin-polarized Rb atoms were obtained. Opt
ical pumping is used to produce precessing spin-polarization in the gr
ound state. Detection of the coherent spin transients is performed in
the time-domain by a single optical probe beam covering the whole samp
le cell. Spatial resolution of better than 1 mm has been achieved by a
projection-reconstruction method.