Imaging using an electromagnetic wave
First Claim
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1. 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, andwherein the step of executing an arithmetic operation processing includes calculating a difference between the second Fourier transform image and the first Fourier transform image.
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Abstract
An object of examination is irradiated with an electromagnetic wave including a frequency component from 30 GHz to 30 THz and a Fourier transform image of the transmitted or reflected electromagnetic wave from the object of examination is obtained. The obtained Fourier transform image is subjected to a spatial frequency filtering processing. This method can visualize only the part to be visualized in an imaging operation using a terahertz wave.
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Citations
16 Claims
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1. An imaging method using an electromagnetic wave, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15)
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9. An imaging apparatus, comprising:
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an irradiation unit for irradiating an object of examination with a collimated coherent electromagnetic wave; an acquisition unit constructed to acquire a Fourier transform image of the object of examination, using the transmitted electromagnetic wave or the reflected electromagnetic wave from the object of examination by means of an optical unit; and a spatial frequency filtering unit constructed to execute a spatial frequency filtering processing on the Fourier transform image, wherein the acquisition unit is constructed to acquire a first Fourier transform image of the object of examination, using a first electromagnetic wave comprising a terahertz wave used for irradiating the object of examination and transmitted or reflected from the object of examination, and constructed to acquire a second Fourier transform image of the object of examination which is to be used as a spatial frequency filter for the first Fourier transform image, using a second electromagnetic wave used for irradiating the object of examination and transmitted or reflected from the object of examination, wherein the first electromagnetic wave and the second electromagnetic wave have center frequencies different from each other, and wherein the spatial frequency filtering unit is constructed to calculate a difference between the second Fourier transform image and the first Fourier transform image. - View Dependent Claims (10, 11, 12, 13, 14, 16)
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Specification