We present a simple processing technique that uses the concept of minimum-phase functions to improve frequency-domain optical coherence tomography systems. Our novel approach removes the auto-correlation noise and therefore increases both the accessible depth range and the recovery accuracy. Furthermore it provides a better axial resolution. To our knowledge, this is the first time that the concept of minimum-phase functions has been applied to improve optical coherence tomography.© (2006) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.