Method of broad band electromagnetic holographic imaging

G - Physics – 01 – N

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Details

G01N 23/04 (2006.01) A61B 5/05 (2006.01) G01N 22/02 (2006.01) G03H 1/04 (2006.01)

Patent

CA 2258081

A method of imaging an object, such as a diseased human heart or bone, in a nontransparent medium, such as the human body, involves placing an array of transmitters (12, 13) and receivers (14, 15) in operational association with the medium (16). The transmitters (12, 13) generate a harmonic (frequency domain) or pulse (time domain) primary EM field which propagates through the medium (16). The primary field interacts with the object to produce a scattered field, which is recorded by the receivers (14, 15). The scattered EM field components measured by the receivers (14, 15) are applied as an artificial EM field to generate a backscattering EM field. Cross power spectra of the primary and backscattering fields (in frequency domain) or cross correlation between these fields (in time domain) produce a numerical reconstruction of an EM hologram. The desired properties of the medium (16), such as conductivity or dielectric permittivity, are then derived from this hologram.

L'invention concerne un procédé de visualisation d'un objet, tel un coeur ou un os humain malade, dans un milieu non transparent tel que le corps humain, impliquant la disposition d'un réseau d'émetteurs (12, 13) et de récepteurs (14, 15) en association fonctionnelle avec le milieu (16). Les émetteurs (12, 13) génèrent un champ électromagnétique primaire à harmoniques (domaine des fréquences) ou à impulsions (domaine du temps) qui se propage à travers le milieu (16). L'interaction entre le champ primaire et l'objet produit un champ dispersé, qui est enregistré par les récepteurs (14, 15). Les composantes du camp électromagnétique dispersé mesurées par les recepteurs (14, 15) sont appliquées en tant que champ électromagnétique artificiel pour produire un champ électromagnétique par rétrodiffusion. Les interspectres des champs primaire et de rétrodiffusion (dans le domaine des fréquences) ou la corrélation croisée entre ces champs (dans le domaine du temps) produisent une reconstruction numérique d'un hologramme électromagnétique. On obtient ensuite les propriétés désirées du milieu (16), telles que la conductivité ou la permittivité, à partir de cet hologramme.

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