  Acousto-Optical Coherence Tomography (AOCT) is a variant of Acousto Optic
Imaging (also called Ultrasound modulated Optical Tomography) that makes
possible to get resolution along the ultrasound propagation axis $z$. We
present here new AOCT experimental results, and we study how the $z$ resolution
depends on time step between phase jumps $T_\phi$, or on the correlation length
$\Delta z$. By working at low resolution, we perform a quantitative comparison
of the $z$ measurements with the theoretical Point Spread Function (PSF). We
present also images recorded with different $z$ resolution, and we
qualitatively show how the image quality varies with $T_\phi$, or $\Delta z$.
