Method and device for diffuse excitation in imaging

摘要

A coupling device for an optical fiber used in optical tomography examination of a medium includes a mass of diffusing material for a wavelength guided by the optical fiber. This mass includes a bearing surface to be applied against the surface of the medium. At least one housing is provided in the mass to receive the end of the optical fiber.

主权项

1. A diffuse optical imaging device to image a medium, comprising:
a radiation source to form incident radiation on the medium, at least at a first wavelength; a device to detect a diffused or fluorescence signal emanating from the medium; a coupling device including:
a mass comprising a bearing surface to be applied against a surface of the medium,an absorbent layer at least partly covering the mass of the diffusing material,at least one collection optical fibre to collect a signal emanating from the medium, and to convey the signal collected towards the detection device, andat least one excitation optical fibre to bring the incident radiation onto the medium to be examined, optical fibre:
either having one end arranged permanently in a diffusing material,or the coupling device comprising at least one housing to receive said optical fibre, this housing being provided in a mass of the diffusing material,an end of the collection optical fibre or a bottom of the housing to receive the collection optical fibre being located at a distance (h) from the bearing surface shorter than a distance (H) from the bearing surface at which an end of the excitation optical fibre or the bottom of the housing to receive the excitation optical fibre is located,said mass of the coupling device being the diffusing material for a wavelength guided by at least one of the optical fibres, the diffusing material capturing photons not directed towards the end of the collection optical fibre and redirecting the captured photons to the end of the collection optical fibre.