Studying Pulsar Emission Regions Using Interstellar Scattering

Radio-wave scattering in the interstellar plasma provides the means to circumvent the diffraction limit for earth-based instruments, and to image the emission regions of pulsars. For the past 25 years, observers have sought to exploit this fact to learn how pulsars shine. I review the techniques developed, and summarize measurements of size of emission regions of pulsars to date. This revised version was published online in July 2006 with corrections to the Cover Date.