Vision in turbid media performed with a miniaturized endoholoscope

摘要

Among the new possibilities offered by an endoholographic method, the vision in turbid media could facilitate the surgical interventions, in particular in vessels, where blood masks the vascular wall. The holographic process allows us to select the coherent light, used to form the image of an object embedded in a turbid medium. An in situ holographic technique based on the use of a flexible miniaturized endoscope (diameter less than 1 mm) coupled to a CCD camera, to record the hologram, was developed for medical applications. The hologram is formed, by reflection, on the tip of a multicore optical fiber (MCF), sampled, and then treated electronically. The image is reconstructed numerically, providing more flexibility to the holographic process. We present here the first experimental results obtained with this imaging system, tested in vitro with conditions matching the typical situations encountered in endoscopy. The possibility of extracting an image out of the ambient noise, produced by the diffusers present in the turbid medium, is described and analyzed.