Energetic neutral atom (ENA) imaging is a powerful technique, which can rem
otely probe the properties of distant hot plasmas. Hot plasmas are abundant
at the heliospheric boundary, the region where the expanding solar wind me
ets the surrounding local interstellar cloud. Here we present a new concept
for imaging this boundary in ENA fluxes. Heliospheric ENAs are born from c
harge exchange between energetic protons and the background interstellar at
omic hydrogen gas. The technique is ideal for studying the asymmetric three
-dimensional heliospheric interface region remotely, from 1 AU. We show tha
t ENA imaging in the 0.2-6 keV energy range will establish the nature of th
e termination shock and properties of hot proton populations in the heliosh
eath. We also examine how the evolution of pickup proton populations at and
beyond the shock can be explored. Global heliosphere ENA images will disti
nguish among the competing models of the interaction between the Sun and th
e local interstellar medium, and they will reveal the physics of important
processes in the interface region. Heliospheric ENA fluxes are exceptionall
y weak, which makes imaging implementation difficult. Nonetheless, we show
how single-pixel ENA sensors can image the heliosphere from a spinning spac
ecraft on a typical mission near 1 AU. The required instrumentation is brie
fly discussed.