Abstract: An optical measurement method that can suppress variation in detection sensitivity even if an optical probe is bent, and an optical probe suitably used for the method are provided. An optical probe 10 includes an optical fiber 11 that transmits light between a proximal end 11a and a distal end 11b, an optical connector 12 connected with the optical fiber 11 at a side of the proximal end 11a, a focusing optical system 13 and a deflecting optical system 14 optically connected with the optical fiber 11 at a side of the distal end 11b, and a support tube 15 and a jacket tube 16 surrounding the optical fiber 11 and extending along the optical fiber 11. The optical fiber 11 is twisted by a number of turns in a range from one turn/m to 50 turns per meter around an axis of the optical fiber as the center and fixed relative to the support tube 15.

Abstract: An optical probe 10 includes an optical fiber 11, an optical connecter 12 being connected to the optical fiber 11, a focusing optical system 13 and a deflection optical system 14 each being connected to the optical fiber 11, a support tube 15 and a jacket tube 16 each surrounding the optical fiber 11 to extend along the optical fiber 11, and a buffer fluid 17 filled in the inner lumen of the jacket tube. The optical fiber 11 has a cutoff wavelength shorter than 1.53 ?m. The optical fiber 11, the focusing optical system 13, the deflection optical system 14, and the buffer fluid 17 and jacket tube 16 on an optical path coupled to a fundamental mode of the optical fiber each have the light transmittance of ?2 dB to 0 dB in a wavelength band of 1.6 ?m to 1.8 ?m.

Abstract: The optical measurement method comprises acquiring a spectrum of interference light produced by interference between back-reflected light from an object to be measured including a plurality of tissues and reference light; creating a two-dimensional reflectance image of the object to be measured according to the spectrum of the interference light; extracting regions occupied by the tissues and a boundary between the tissues in the reflectance image created; setting a range to be analyzed and a spatial averaging range according to the regions and boundary; averaging a concentration distribution of a component obtained in the spatial averaging range including the pixel and taking the average as a concentration of the component at the pixel, so as to calculate a concentration distribution of the component in the tissues; and classifying tissue type according to the extracted regions and concentration distribution, so as to generate a tissue classification image.

Abstract: A method for acquiring an optical tomographic image is disclosed. The method acquires the optical tomographic image based on a result of a Fourier transform of an interference light spectrum obtained by dividing light into first branched light and second branched light and causing mutual interference between reflected light and diffused reflected light. The reflected light arises at a reflecting body when the first branched light is irradiated onto the reflecting body. The diffused reflected light arises when the second branched light is irradiated onto an examination region. The acquisition method includes: acquiring a first optical tomographic image when an examination object is arranged in the examination region; acquiring a second optical tomographic image when the examination object is not arranged in the examination region; and acquiring the optical tomographic image based on a difference between the first optical tomographic image and the second optical tomographic image.

Abstract: A spectroscopic imaging device adjusting method adjusts a relative arrangement relationship among a collimating lens, a diffraction grating, a condensing lens and an array type light receiving part so as to maximize the value of the following expression (1) for an output values ƒn from respective light receiving sensors Pn when monochromatic light is inputted to a spectroscopic imaging device, wherein ?>1 and n is each integer equal to or larger than 1 and equal to or smaller than N.

Abstract: Provided is an optical probe that can perform low-noise precise OCT measurement even if an object with a high scattering property is measured. The optical probe 20 includes an optical fiber 21 that transmits light between a proximal end 21a and a distal end 21b, an optical connector 22 connected with the optical fiber 21 at the proximal end 21a, a focusing optical system 23 and a deflecting optical system 24 connected with the optical fiber 21 at the distal end 11b, and a support tube 25 and a jacket tube 26 surrounding the optical fiber 21 and extending along the optical fiber 21. The optical fiber 21 includes a core region 41 having a refractive index n1, a first cladding region 42 surrounding the core region and having a refractive index n2, a trench region 43 surrounding the first cladding region and having a refractive index n3, and a second cladding region 44 surrounding the trench region and having a refractive index n4. The refractive indices have a relationship of n1>n2>n3<n4.

Abstract: An optical measurement method that can suppress variation in detection sensitivity even if an optical probe is bent, and an optical probe suitably used for the method are provided. An optical probe 10 includes an optical fiber 11 that transmits light between a proximal end 11a and a distal end 11b, an optical connector 12 connected with the optical fiber 11 at a side of the proximal end 11a, a focusing optical system 13 and a deflecting optical system 14 optically connected with the optical fiber 11 at a side of the distal end 11b, and a support tube 15 and a jacket tube 16 surrounding the optical fiber 11 and extending along the optical fiber 11. The optical fiber 11 is twisted by a number of turns in a range from one turn/m to 50 turns per meter around an axis of the optical fiber as the center and fixed relative to the support tube 15.