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Accueil > Équipes > OPTique et IMAgerie > Imagerie photoacoustique

Minimally invasive microendoscopy

publié le , mis à jour le

Antonio Miguel Caravaca Aguirre, Xiangwen Li, Marc Grosjean, Philippe Moreau, Irène Wang and Emmanuel Bossy

Endoscopy allows imaging inside the tissues, by inserting a device that guides the light towards the area to be explored. Endoscopy can be performed either through natural cavities or by incision. In the team, we are developing photoacoustic endoscopy methods to image specifically the optical absorption in biological tissue, including vascularization. In particular, we are developing minimally invasive photoacoustic microendoscopy devices as part of the COHERENCE project, by use of multimode optical fibers (MMF), which significantly reduce the diameter of the endoscope compared to approaches based on single-mode fiber bundles or scanning systems (for comparable imaging performance).
However, optical propagation in MMF is much more complex than propagation in single-mode fibers, and it is necessary to first characterize the multi-mode fiber to be able to reconstruct an image of the object present at the end of fiber. To this end, we develop various methods that exploit light coherence, such as wide-field illumination by optical speckle figures, or the focusing and scanning of an optical spot by wavefront shaping.