Patent ID: 8233049

Claim:
An imaging method using an electromagnetic wave, comprising: a first generation step of generating a first electromagnetic wave comprising a terahertz wave; a step of acquiring a first Fourier transform image of an object of examination, using the first electromagnetic wave generated in the generation step and transmitted through or reflected by the object of examination; a step of acquiring a second Fourier transform image to be used as a spatial frequency filter for the first Fourier transform image; and a step of executing an arithmetic operation processing on the first Fourier transform image and the second Fourier transform image, wherein the second Fourier transform image is a Fourier transform image of the object of examination acquired by using a second electromagnetic wave which has a center frequency different from a center frequency of the first electromagnetic wave, and wherein the step of executing an arithmetic operation processing includes calculating a difference between the second Fourier transform image and the first Fourier transform image.