A new and simple gated photon counting system is described for the recovery of optical parameters in diffusive media. Compared with the traditional gated photon counting technique, the system is based on a 60 ns width-sliding gate that enables reconstruction of the photon decay curve at 200 ps time resolution, which is detected when a light pulse is impinged on the diffusive media. Patterson-Chance method allows the optical parameters of the medium under investigation to be retrieved quickly and accurately. Experimental results on a phantom modeling breast tissue demonstrate the feasibility of the technique. Good agreement with complicated time-correlated single photon counting technique plus curve-fitting method was achieved leading to less than 10% of miss-estimation on the optical parameters.