Spectroscopic imaging method for multi-frequency electrical impedance tomography

A technology of electrical impedance tomography and electrical impedance imaging, which can be used in diagnosis, diagnostic recording/measurement, medical science, etc., and can solve problems affecting the identification of stroke

Inactive Publication Date: 2016-01-13
FOURTH MILITARY MEDICAL UNIVERSITY
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Problems solved by technology

Therefore, in imaging results, normal tissue can seriously affect the recognition of stroke

Method used

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  • Spectroscopic imaging method for multi-frequency electrical impedance tomography
  • Spectroscopic imaging method for multi-frequency electrical impedance tomography
  • Spectroscopic imaging method for multi-frequency electrical impedance tomography

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[0066] Such as figure 1 As shown, different normal tissues and stroke tissues in the brain have different impedance frequency characteristics, so the impedance spectrum of the tissues can be used to distinguish different tissues and achieve the purpose of detecting stroke.

[0067] 1) The data imaging at all frequencies in the frequency band is used to obtain the electrical impedance spectrum image;

[0068] In multi-frequency electrical impedance tomography, the relationship between the measured boundary voltage variation Δv between different frequencies and the impedance variation Δδ between different frequencies can be approximately described by a linear system: Δv=S Δδ, where S is the sensitivity matrix . The purpose of electrical impedance is to estimate impedance changes from boundary voltage measurements.

[0069] Since the solution to the electrical impedance problem is ill-conditioned, the cost function is set as min Δ...

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Abstract

The invention discloses a spectroscopic imaging method for multi-frequency electrical impedance tomography which can be used for early detection of cerebral stroke and belongs to the technical field of electrical impedance tomography. The spectroscopic imaging method includes firstly, using data at all frequency positions in a frequency band for imaging, and reconstructing electrical impedance tomography spectral images reflecting tissue impedance change along with frequencies according to impedance spectral characteristics of tissues; secondly, according to impedance spectral specificity of the tissues, obtaining independent electrical impedance images from the electrical impedance tomography spectral images so as to separate cerebral stroke tissues from normal tissues; finally, selecting the electrical impedance images capable of reflecting the cerebral stroke tissues according to spatial information and position information of the cerebral stroke tissues. The spectroscopic imaging method is capable of detecting focuses of the cerebral stroke from experiments which are based on a real cranium brain structure so as to lay the foundation for applying the multi-frequency electrical impedance tomography to rapid early detection of the cerebral stroke.

Description

technical field [0001] The invention belongs to the technical field of electrical impedance imaging, and relates to a spectral imaging method of multi-frequency electrical impedance tomography that can be used for early detection of cerebral apoplexy. Background technique [0002] Stroke has high mortality and morbidity, and has become the second leading cause of death in the world. Early detection and timely intervention are the keys to improving the prognosis of acute stroke patients. Although the existing clinical detection technologies CT and MRI can detect cerebral apoplexy, due to their bulky size and high price, they cannot be used as a portable device suitable for basic medical units and rescue processes. Multi-frequency electrical impedance is based on the characteristics of different impedance spectra of different tissues in the human body. At the same time, a small safe current is applied to the human body through the body surface electrodes, and the boundary volt...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/053
Inventor 董秀珍杨琳徐灿华付峰代萌史学涛尤富生张戈李蔚琛
Owner FOURTH MILITARY MEDICAL UNIVERSITY
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