FR3083077B1 - Procede de reconstruction tomographique differentielle - Google Patents

Procede de reconstruction tomographique differentielle Download PDF

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Publication number
FR3083077B1
FR3083077B1 FR1856084A FR1856084A FR3083077B1 FR 3083077 B1 FR3083077 B1 FR 3083077B1 FR 1856084 A FR1856084 A FR 1856084A FR 1856084 A FR1856084 A FR 1856084A FR 3083077 B1 FR3083077 B1 FR 3083077B1
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France
Prior art keywords
ray
thz
detection system
simulation
tomographic reconstruction
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FR1856084A
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English (en)
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FR3083077A1 (fr
Inventor
Alexandre Duhant
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Terakalis Fr
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Terahertz Waves Tech
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Priority to FR1856084A priority Critical patent/FR3083077B1/fr
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G06T11/003—Reconstruction from projections, e.g. tomography
    • G06T11/006—Inverse problem, transformation from projection-space into object-space, e.g. transform methods, back-projection, algebraic methods
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A61B5/0073—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence by tomography, i.e. reconstruction of 3D images from 2D projections
    • 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
    • G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
    • 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
    • G01N21/4795—Scattering, i.e. diffuse reflection spatially resolved investigating of object in scattering medium

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  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Biomedical Technology (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Algebra (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Pure & Applied Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

Le procédé de reconstruction tomographique différentielle, met en œuvre, pour un objet modélisé, un procédé d'estimation de la quantité d'énergie reçue dans un système de détection THz après avoir émise par une source et après avoir traversé ledit objet, procédé d'estimation qui comporte : - une étape de simulation d'un faisceau THz émis par la source composé d'une pluralité de rayons (30 à 33) dont l'orientation et l'excentrement par rapport à l'axe optique sont choisis aléatoirement selon un modèle Gaussien basé sur les méthodes aléatoires de type Monte Carlo correspondant à l'ouverture d'un système de détection, - une étape de simulation de propagation de chaque rayon THz dans les matériaux composant l'objet selon les lois de Snell-Descartes prenant en compte des pertes par réflexion et de la déviation du rayon à chaque interface et - une étape de simulation d'atténuation de l'intensité de chaque rayon en considérant un modèle d'atténuation exponentielle selon la loi de Beer-Lambert.
FR1856084A 2018-07-02 2018-07-02 Procede de reconstruction tomographique differentielle Active FR3083077B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR1856084A FR3083077B1 (fr) 2018-07-02 2018-07-02 Procede de reconstruction tomographique differentielle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1856084 2018-07-02
FR1856084A FR3083077B1 (fr) 2018-07-02 2018-07-02 Procede de reconstruction tomographique differentielle

Publications (2)

Publication Number Publication Date
FR3083077A1 FR3083077A1 (fr) 2020-01-03
FR3083077B1 true FR3083077B1 (fr) 2023-06-23

Family

ID=65861322

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1856084A Active FR3083077B1 (fr) 2018-07-02 2018-07-02 Procede de reconstruction tomographique differentielle

Country Status (1)

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FR (1) FR3083077B1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070258122A1 (en) * 2004-10-06 2007-11-08 Bc Cancer Agency Computer-Tomography Microscope and Computer-Tomography Image Reconstruction Methods
AU2010286592B2 (en) * 2009-08-28 2015-08-13 Visen Medical, Inc. Systems and methods for tomographic imaging in diffuse media using a hybrid inversion technique

Also Published As

Publication number Publication date
FR3083077A1 (fr) 2020-01-03

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