Patent ID: 9134111
Filing Date: 2015-09-15
Classification: A61B,G01B,G01N,G03H

Abstract:
1. A method for 3D imaging of a scattering sample, in particular for determining the spatial scattering-power distribution—S(x,y,z) of the sample, comprising: a. splitting laser light having a wavelength that can be selected within a predetermined band width, into a sample and a reference light beam, b. illumining the sample at N different wavelengths λ c. superposing the scattered sample light with the reference light on the 2D light detector array and recording in each case one hologram for each of the N wavelengths, d. calculating the electric wave field scattered in the sample for each of the N wavelengths in the plane of the 2D light detector array, e. propagating all calculated wave fields in a predetermined reconstruction plane that is aligned perpendicular to the optical axis of the sample light beam, f. calculating the transverse space-frequency spectrum E g. phase matching of the transverse space-frequency spectrum for each of the N wavelengths for compensation of the propagation-time differences produced by d) or e) between the propagated wave field and the reference light, h. calculating the depth-dependent scattering-power spectrum S(k i. calculating the scattering power S(x,y,z) in at least one layer of the sample in the surroundings of the reconstruction plane, wherein phase matching takes place by multiplying each transverse space-frequency spectrum by a phase factor as a function of k