Neutral atom imaging promises to provide a detailed picture of the global structure and dynamics of the magnetosphere. The neutral atom fluxes are characteristically small, and techniques to image neutral atoms must be highly sensitive to neutral atoms while rejecting the enormous background UV flux. Several imaging techniques that exploit a unique difference in properties of neutral atoms and UV are being developed. Limitations of the fundamental physics of each of these techniques, which are studied and compared here, have resulted in neutral atom imagers optimized for different energy regimes. The emerging technique utilizing a transmission grating promises to span a broad energy range with one instrument.