WO2003056307A1 - Technique d'analyse optique pour milieu heterogene - Google Patents
Technique d'analyse optique pour milieu heterogene Download PDFInfo
- Publication number
- WO2003056307A1 WO2003056307A1 PCT/JP2002/013716 JP0213716W WO03056307A1 WO 2003056307 A1 WO2003056307 A1 WO 2003056307A1 JP 0213716 W JP0213716 W JP 0213716W WO 03056307 A1 WO03056307 A1 WO 03056307A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tissue
- medium
- light
- scattering
- light intensity
- Prior art date
Links
- 238000004204 optical analysis method Methods 0.000 title abstract description 8
- 238000000034 method Methods 0.000 claims description 39
- 238000004364 calculation method Methods 0.000 claims description 17
- 238000010521 absorption reaction Methods 0.000 claims description 16
- 238000004458 analytical method Methods 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000014509 gene expression Effects 0.000 claims description 9
- 230000008520 organization Effects 0.000 claims description 7
- 238000000149 argon plasma sintering Methods 0.000 claims description 4
- 238000002834 transmittance Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 210000001519 tissue Anatomy 0.000 description 58
- 210000004204 blood vessel Anatomy 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 239000000126 substance Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- 108010054147 Hemoglobins Proteins 0.000 description 3
- 102000001554 Hemoglobins Human genes 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000002835 absorbance Methods 0.000 description 2
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004043 dyeing Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229930014626 natural product Natural products 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241000283986 Lepus Species 0.000 description 1
- 238000000342 Monte Carlo simulation Methods 0.000 description 1
- 108010064719 Oxyhemoglobins Proteins 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- -1 industrial products Natural products 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 210000001161 mammalian embryo Anatomy 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 235000014593 oils and fats Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3563—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing solids; Preparation of samples therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
Definitions
- the present invention relates to a method for optically analyzing a heterogeneous medium.
- Natural products and living organisms are typical of heterogeneous and scattering media, but methods for analyzing such scattering media having light scattering properties and having a non-uniform structure are well known. Absent. Of course, an inhomogeneous medium can be regarded as homogeneous and analyzed approximately.
- a living body is irradiated with high-frequency pulsed light of a few discrete wavelengths (eg, about 760 nm, etc.) (about 7 to 20 OMHz). Then, light is received at a certain distance, and the attenuation (Attenuation), phase (P hase) deviation, and modulation (Modulation) are measured using the diffusion equation to determine the absorption coefficient and the absorption coefficient at the measured wavelength. After calculating the scattering coefficient, a device has been developed to estimate the amount of hemoglobin from the amount of absorption coefficient. Disclosure of the invention
- the optical characteristics and refractive index of each tissue are different, and inter-tissue scattering occurs. That is, the living tissue is not uniform, and is not simply a mixture of scatterers and absorbers.
- characteristic substances blood vessels, muscles, fats, etc.
- the optical properties of the living body eg, transmittance distribution
- the conventional method calculates assuming that it is a homogeneous system, and it was impossible to measure the concentration of the substance in the body accurately.
- Japanese Patent Application Laid-Open No. Hei 4-279584 discloses a method for analyzing a physical quantity using an exponential function.
- the light diffusion effect in a medium is corrected.
- An exponential function is used as the absorbance correction function.
- Even in a homogeneous medium the effective optical path length increases due to light diffusion. As the effective optical path length increases, light intensity attenuation occurs.
- the present invention has been made to solve such a problem, and an object of the present invention is to provide an optical analysis method capable of accurately analyzing a heterogeneous medium.
- the inventor of the present application has proposed, as an optical analysis method for a heterogeneous medium, that in the method of establishing the first differential equation for a heterogeneous model, the light of (x ,, y) in two tissues with respect to the traveling direction of light.
- Such an analysis method is theoretically constructed based on the attenuation of light by an absorbing substance and a scattering substance in the light traveling direction, and on the basis of an increase in scattering input from another channel.
- the method of the present invention is based on the Kube 1 ka-Munk analysis method, Is based on two simultaneous equations for the direction of travel and two directions for the opposite direction.
- two phases (x, y) are provided, and the transfer of photons between each phase is summarized in a differential equation, and the equations are solved. Expressions are the basis.
- the point of the invention of the present invention is that the general formula for explaining the non-uniformity is obtained, and by using this general formula, the medium pays attention even if the medium itself has a complicated non-uniform region in which tissues are intertwined.
- the absolute value in the organization can be determined.
- the physical quantities related to these are distinguished by subscripts (x, y). That is, the subscripts X and And y indicate that the absorption coefficient a and the scattering coefficient s are for the tissues X and Y, respectively. Also, the number of photons traveling on them is indicated by (x, y). Let the direction of light penetration be the z direction. Since photons are also scattered during the process, they are also converted to the backward flow, so the forward photons are given the suffix f, and the backward photons are given the b suffix. That is, the number of photons traveling in the forward direction is x f, y f, the number of photons traveling in the opposite direction is the x b, y b.
- T and R can be determined.
- the position of the scattering point is It must be within the photon mean free path from the interface.
- the scattering coefficient is high, the amount of light that enters the adjacent tissue due to scattering increases, but on the other hand, the mean free path is shortened, so that the total volume of the relevant generating points is reduced, and the two cancel each other out, and The amounts of light mixed into each other are equal and constant regardless of the scattering coefficient.
- the inter-organizational boundary surface is a plane, but separately, the inter-organizational boundary surface is a curved surface.
- the light scattered in the blood vessels always goes to the external tissues,
- the development volume is the blood vessel volume itself.
- the point of photon generation that is scattered in the tissue outside the blood vessel and enters the blood vessel is located only on the outer jacket of the cylinder surrounding the blood vessel with the radius of the mean free path from the blood vessel.
- tissue cross-sectional area ratio “K” can be regarded as an undetermined constant because it is essentially a geometric constant.
- the direction of light penetration “ ⁇ ” may not be constant.
- tissue cross-sectional area ratio “ ⁇ ” is treated as an average constant with respect to the medium depth. When “ ⁇ ” changes slowly with respect to depth, this change can be ignored.
- the number of equations can be increased by changing the measurement wavelength.
- the coefficients in each case need to be known for their wavelength dependence.
- the light absorption coefficient a the longitudinal scattering coefficient s, and the like can be obtained.
- the physical quantity desired to be obtained by measurement analysis is the concentration of the contained component.
- concentration of the contained component is the concentration of the contained component.
- Absorption coefficient a and scattering coefficient ⁇ are given by the following formula (*).
- the above equation includes undetermined coefficients (K :, F). Since these are known to be constants, erasure is easy. It is sufficient to measure at different wavelengths in order to make up the extra number of equations.
- the least squares calculation of the nonlinear equation is performed by the Newton approximation method.
- the method of applying the least squares method to each of the above-mentioned equations in each step in order to obtain the final (p, q) Can be easily seen.
- an accelerated convergence solution can be applied by various known methods.
- the number of wavelengths is 6 or more, it is theoretically possible to calculate any number of wavelengths (for example, 496 wavelengths, etc.), and it is a continuous spectrum. Or, even if it has discrete wavelength characteristics, it doesn't matter.
- the final calculation result can be obtained with the least error, which has not been possible in such a complicated system.
- the medium has a completely different layered structure with respect to depth, for example, if there is a skin layer, a coating protective layer, etc. . It is simple if the thickness of those parts is known, but can also be solved if the thickness is unknown. That is, the coefficient matrices described above can be combined and handled as a cascade of two types of transfer functions. In the case described above, it was shown that calculation should be performed including some undetermined coefficients. By measuring at different wavelengths and simultaneously solving many simultaneous equations and applying the least-squares method, we show that complex tissue structures in heterogeneous media can be expressed as a form including undetermined coefficients. Was. The feature of this theory is that these undetermined coefficients can be solved using the fact that they can be eliminated as implicit functions in this way.
- tissue structure parameters could be approximated as simple implicit functions, so they were eliminated during the numerical analysis, and a solution without heterogeneous content was discussed in detail. Has reachable characteristics.
- a substance is a medium having a multiphase or multiphase-separated structure such as a heterogeneous substance or a mixture
- the method is applied to separate and independently calculate each component in each tissue. be able to. If the heterogeneous medium is composed of many divided tissues, reduce it from the simultaneous equations including the number of mediating elements according to each tissue type, and apply this to the above analysis method when there are two tissues X and Y. Can be.
- the analysis method described here achieves the desired solution in multiple tissues, such as tissue X and tissue Y, without explicitly treating the differences in the detailed optical properties of the tissues. This is extremely useful for practical use.
- tissue X and tissue Y are treated as a blood portion in the blood vessel
- Y tissue is treated as the other tissue portion
- x and y are calculated as the light amounts included in each.
- the effective application range of the present invention is a medium in which absorption and scattering coexist, and a non-uniformly mixed medium, and a wide range in which conventional measurement was difficult. It can be applied to materials, and its effects are great. Examples include natural products such as industrial products, foods and plants, other mixtures, polycrystals, turbid substances, and the like.
- plastic and other (metal) materials In other words, if we consider visible light as a medium, without considering it as a medium, but as a general electromagnetic wave), when they are being melted, they are in a state between solid and liquid or between them (for metals, Solid solutions), but they can be a means to elucidate the content of their mixture.
- the problems are: (1) you need to know the basic numerical database of the absorption coefficient and scattering coefficient as a function of wavelength, and (2) the calculation is based on the general solution method. Since the volume may increase, it is necessary to consider the simplicity of the numerical processing method. Since these differ depending on the object, it is necessary to empirically search for an appropriate omission means for each specific case.
- tissue parameters can be approximated as simple implicit functions, and they are eliminated during the numerical analysis.However, how much of the tissue parameters are actually calculated without leaving them outside becomes one point. The above calculation is performed by a computer as a calculation device.
- the formula that forms the basis for the creation of the above-mentioned general formula is the formula of Amy (L. Amy, Rev. d'optiquel 681 (19338)).
- the general formula of the present invention is based on Amy's formula (uniform composition formula of a single composition). This means that photons are exchanged between other channels.
- This formula can be used as a general formula for quantitative analysis of mixtures, polycrystals, turbid substances, and other substances in a heterogeneous state.
- the method for optically analyzing a heterogeneous medium is capable of transmitting a light-absorbing and light-scattering heterogeneous medium including a plurality of tissues X and Y having different optical characteristics.
- the physical quantity of the medium is determined from the intensity of the reflected light, and the procedure executed by the computer includes the following steps.
- the target physical quantities can be calculated by a computer using algebraic arithmetic including least squares. It is calculated by calculation.
- the organization consists of two phases, X and Y, and the target physical quantity is set to a physical quantity in the database other than the known physical quantity (PV).
- Thickness of the medium Absorption coefficient of tissue X
- ⁇ y Parameter defined according to homogeneous system for Y structure
- the mutual redistribution coefficient F should be determined by the microstructure of the tissue, and in many cases it is a constant.In other words, when the mean radius of curvature of the tissue interface is smaller than the photon mean free path, the above equation is used. When F is large, on the other hand, instead of F 2 s x s y in the above equation, the equation 3 ⁇ 4r simply expressed by another constant F 2 is used.
- the concentration of the predetermined component can be calculated using a relationship in which the physical quantities a x , s x , a y , and S y are proportional to the concentration of the target component in the medium.
- a heterogeneous medium can be accurately analyzed.
- This invention can be utilized for the optical analysis method of a heterogeneous medium.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/500,239 US20050106744A1 (en) | 2001-12-26 | 2002-12-26 | Optical analysis for heterogeneous medium |
EP02792032A EP1460412A4 (en) | 2001-12-26 | 2002-12-26 | OPTICAL ANALYSIS METHOD FOR HETEROGENE MEDIUM |
JP2003556782A JP4084307B2 (ja) | 2001-12-26 | 2002-12-26 | 不均質媒質の光学的分析方法 |
AU2002361113A AU2002361113A1 (en) | 2001-12-26 | 2002-12-26 | Optical analysis method for heterogeneous medium |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-395145 | 2001-12-26 | ||
JP2001395145 | 2001-12-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003056307A1 true WO2003056307A1 (fr) | 2003-07-10 |
Family
ID=19188940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/013716 WO2003056307A1 (fr) | 2001-12-26 | 2002-12-26 | Technique d'analyse optique pour milieu heterogene |
Country Status (5)
Country | Link |
---|---|
US (1) | US20050106744A1 (ja) |
EP (1) | EP1460412A4 (ja) |
JP (1) | JP4084307B2 (ja) |
AU (1) | AU2002361113A1 (ja) |
WO (1) | WO2003056307A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007121034A (ja) * | 2005-10-26 | 2007-05-17 | Meiji Milk Prod Co Ltd | 粘性流体中の固形物含有量の測定装置及び測定方法 |
JP2008116269A (ja) * | 2006-11-02 | 2008-05-22 | Sumitomo Heavy Ind Ltd | 温度計測装置、及び温度算出方法 |
JP2010266377A (ja) * | 2009-05-15 | 2010-11-25 | Yoshihiko Mizushima | 不均一物質の光分析方法 |
JP2017009338A (ja) * | 2015-06-18 | 2017-01-12 | 国立大学法人山梨大学 | 光学特性の測定方法及び光学特性の測定装置 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3718600A1 (en) * | 2019-04-04 | 2020-10-07 | SpectraCure AB | System and method for determining light attenuation at optical members inserted in tissue |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000065330A1 (fr) * | 1999-04-21 | 2000-11-02 | Hamamatsu Photonics K.K. | Procede d'analyse optique de milieu non homogene |
JP2001264245A (ja) * | 2000-03-21 | 2001-09-26 | Hamamatsu Photonics Kk | 散乱吸収体内部の光路分布計算方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4972331A (en) * | 1989-02-06 | 1990-11-20 | Nim, Inc. | Phase modulated spectrophotometry |
JP2539707B2 (ja) * | 1991-03-27 | 1996-10-02 | 大塚電子株式会社 | 吸光スペクトルの補正方法およびその方法を用いた光拡散物質の分光測定装置 |
JP3577335B2 (ja) * | 1993-06-02 | 2004-10-13 | 浜松ホトニクス株式会社 | 散乱吸収体計測方法及び装置 |
JP3887486B2 (ja) * | 1998-05-26 | 2007-02-28 | 浜松ホトニクス株式会社 | 散乱吸収体の内部特性分布の計測方法及び装置 |
-
2002
- 2002-12-26 AU AU2002361113A patent/AU2002361113A1/en not_active Abandoned
- 2002-12-26 WO PCT/JP2002/013716 patent/WO2003056307A1/ja active Application Filing
- 2002-12-26 US US10/500,239 patent/US20050106744A1/en not_active Abandoned
- 2002-12-26 EP EP02792032A patent/EP1460412A4/en not_active Withdrawn
- 2002-12-26 JP JP2003556782A patent/JP4084307B2/ja not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000065330A1 (fr) * | 1999-04-21 | 2000-11-02 | Hamamatsu Photonics K.K. | Procede d'analyse optique de milieu non homogene |
JP2001264245A (ja) * | 2000-03-21 | 2001-09-26 | Hamamatsu Photonics Kk | 散乱吸収体内部の光路分布計算方法 |
Non-Patent Citations (2)
Title |
---|
JIANG H. ET AL., OPTICS LETTERS, vol. 20, no. 20, 1995, pages 2128 - 2130, XP000532382 * |
See also references of EP1460412A4 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007121034A (ja) * | 2005-10-26 | 2007-05-17 | Meiji Milk Prod Co Ltd | 粘性流体中の固形物含有量の測定装置及び測定方法 |
JP2008116269A (ja) * | 2006-11-02 | 2008-05-22 | Sumitomo Heavy Ind Ltd | 温度計測装置、及び温度算出方法 |
JP2010266377A (ja) * | 2009-05-15 | 2010-11-25 | Yoshihiko Mizushima | 不均一物質の光分析方法 |
JP2017009338A (ja) * | 2015-06-18 | 2017-01-12 | 国立大学法人山梨大学 | 光学特性の測定方法及び光学特性の測定装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1460412A4 (en) | 2009-12-02 |
US20050106744A1 (en) | 2005-05-19 |
EP1460412A1 (en) | 2004-09-22 |
AU2002361113A1 (en) | 2003-07-15 |
JPWO2003056307A1 (ja) | 2005-05-12 |
JP4084307B2 (ja) | 2008-04-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP3527600B2 (ja) | 散乱マトリックスの内部に関する分析データを決定するための方法および装置 | |
US4883953A (en) | Spectroscopic method and apparatus for measuring sugar concentrations | |
KR102363178B1 (ko) | 비-침습적 물질 분석 | |
Bonner et al. | Model for photon migration in turbid biological media | |
JP6289517B2 (ja) | 体液試料中の脂質および他の干渉物質(interferingsubstance)を決定するための方法 | |
JP6120842B2 (ja) | 体液中の物質の濃度を測定するための方法及びシステム | |
Tarumi et al. | Simulation study of in vitro glucose measurement by NIR spectroscopy and a method of error reduction | |
JPH11337476A (ja) | 散乱吸収体の内部特性分布の計測方法及び装置 | |
Hu et al. | Spatial-frequency domain imaging coupled with frequency optimization for estimating optical properties of two-layered food and agricultural products | |
US20120253149A1 (en) | Method and apparatus for non-invasive photometric blood constituent diagnosis | |
Askoura et al. | Multispectral measurement of scattering-angular light distribution in apple skin and flesh samples | |
WO2003056307A1 (fr) | Technique d'analyse optique pour milieu heterogene | |
Marble et al. | Diffusion-based model of pulse oximetry: in vitro and in vivo comparisons | |
Nishidate et al. | Estimation of absorbing components in a local layer embedded in the turbid media on the basis of visible to near-infrared (VIS-NIR) reflectance spectra | |
Lakhal et al. | PARAFAC analysis of front-face fluorescence data: Absorption and scattering effects assessed by means of Monte Carlo simulations | |
US6975401B2 (en) | Method of calculating optical path distribution inside scattering absorber | |
EP1182444B1 (en) | Method for optically analyzing an inhomogeneous medium | |
Lübbers et al. | Absolute reflection photometry at organ surfaces | |
US11583212B2 (en) | Method and apparatus for non-invasive photometric blood constituent diagnosis | |
Fang et al. | Multiple forward scattering reduces the measured scattering coefficient of whole blood in visible-light optical coherence tomography | |
Leger | Alleviating the effects of light scattering in multivariate calibration of near-infrared spectra by path length distribution correction | |
Inagaki et al. | Time-of-flight spectroscopy | |
Tsuchiya | Photon path distribution in inhomogeneous turbid media: theoretical analysis and a method of calculation | |
Hülsbusch et al. | Photon-Tissue Interaction Modelled by Monte Carlo Method for Optimizing Optoelectronic Sensor Concepts | |
Ri et al. | Theoretical prediction of the source-detector separation distance suited to the application of the spatially resolved spectroscopy from the near-infrared attenuation data cube of tissues |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SK SL TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LU MC NL PT SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2003556782 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10500239 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2002792032 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2002792032 Country of ref document: EP |