Patent ID: 6704591
Filing Date: 2004-03-09
Classification: A61B

Abstract:
A method of restoring phase information of radiation transmitted through an object on the basis of a plurality of image signals respectively obtained by detecting intensity of radiation transmitted through the object on a plurality of planes different in distance from the object, each of the plurality of image signals representing radiation image information on the plurality of planes, said method comprising the steps of:obtaining a differential signal representing difference between a first image signal and a second image signal of said plurality of image signals; subjecting any one of said plurality of image signals to one of a suppressing process and a removing process for high spatial frequency components thereof so as to generate a third image signal; obtaining Laplacian of phase with respect to said differential signal and said third image signal; and restoring phase information of the radiation by applying an inverse Laplacian operation to said Laplacian of phase.