Patent ID: 6327489
Filing Date: 2001-12-04
Classification: A61B,G01N

Abstract:
A method of localizing an object in a turbid medium comprising:irradiating the turbid medium with light,measuring intensities of a part of the light transported through the turbid medium along a plurality of light paths from a source point where the light enters the turbid medium to a measuring point where the light leaves the turbid medium, andreconstructing an image of the interior of the turbid medium from a combination of measured intensities, wherein a weighting factor is applied to the combination of measured intensities which reduces an effect exerted on the reconstructed image by the measured intensities with a high noise factor relative to the effect exerted thereon by the measured intensities with a low noise factor,wherein, for a light source and a measuring position at which intensities are measured, the method further comprises:determining an estimated intensity from a transformation of a predetermined first image,determining a difference between the measured intensities and the estimated intensity, anddetermining a next image from the first image, a convergence factor and a back-transformation of the difference, the convergence factor being chosen depending on the weighting factor.