The radial velocity technique is without contest nowadays the most successful method to 
detect and characterize the properties of exo-planetary systems and brown dwarfs companions. 
However, this method is intrinsically limited to the close circumstellar environment (<4 
AU). To understand the way planetary systems form and evolve, it is then clearly interesting 
to use complementary techniques such as direct imaging to further complete our view. Since 
2003, we have conducted a deep coronographic imaging survey of exoplanet host stars, using 
PUEO-KIR at CFHT, and NACO at VLT. I will describe in this presentation our sample, our 
observing strategy and the main results of this observing campaign. It includes the 
discovery of new close stellar and white dwarf companions, their spectral and dynamical 
characterization and the study of their impact on the formation and the evolution of the 
inner planetary systems.