Electromagnetic wave propagation speed based biological tissue electromagnetic parameter imaging device and method
A technology of biological tissue and electromagnetic parameters, which is applied in the directions of sensors, medical science, diagnostic recording/measurement, etc., and can solve problems such as difficulty in accurately measuring propagation time and short propagation time of electromagnetic field
Active Publication Date: 2015-01-07
NORTHEASTERN UNIV
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However, due to the small size of biological tissues, the propagation time of electromagnetic fields in biological tissues is very short, the order of magnitude reaches nanoseconds, and it is difficult to accurately measure the propagation time with conventional methods
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[0065] Electromagnetic waves can penetrate the surface of living organisms and propagate inside them. According to the wave theory, when a wave propagates in a biological tissue, its propagation law is closely related to the wavelength of the wave in the biological tissue, and it attenuates as the wave energy is absorbed by the medium during propagation. Generally, if the wavelength is much larger than the size of biological tissue, the wave can be physically approximated as quasi-static.
[0066] When electromagnetic waves propagate in biological tissues, their wavelength has a great relationship with the electromagnetic properties of each tissue. The relevant electromagnetic parameters mainly include: electrical conductivity, dielectric constant and magnetic permeability. Among them, the magnetic permeability of biological tissue is very similar to the magnetic permeability in vacuum, so it has no imaging value. Both the electrical conductivity and the dielectric constant ...
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The invention discloses an electromagnetic wave propagation speed based biological tissue electromagnetic parameter imaging device and method and belongs to the field of biological tissue electromagnetic parameter imaging. The electromagnetic wave propagation speed based biological tissue electromagnetic parameter imaging device comprises an electromagnetic wave transmitting coil, an electromagnetic wave receiving coil, a U-shaped arm, an objective table, a motor unit, a motor driving unit, a control unit and an opening type oscillating circuit. The electromagnetic wave propagation speed based biological tissue electromagnetic parameter imaging method comprises initializing devices; measuring the electromagnetic wave propagation speed of biological tissues; enabling an FPGA (Field Programmable Gate Array) to upload the electromagnetic wave propagation time to a terminal computer in real time through a single chip microcomputer, enabling the terminal computer to calculate the electromagnetic wave propagation speed of positions of the biological tissues through a speed formula according to the distance between the electromagnetic wave transmitting coil and the electromagnetic wave receiving coil; performing image reconstruction on the biological tissue through a regularization Gaussian Newton reconstruction algorithm (NOSER) and obtaining a reconstruction image of the biological tissue. The electromagnetic wave propagation speed based biological tissue electromagnetic parameter imaging device and method provides a brand new, simple and effective detection mean and is low in cost and free of radiation compared with traditional medical imaging equipment.
Description
technical field [0001] The invention belongs to the field of biological tissue electromagnetic parameter imaging, and in particular relates to a biological tissue electromagnetic parameter imaging device and method based on electromagnetic wave propagation velocity. Background technique [0002] Biological tissues are composed of cells, and cells are composed of intracellular fluid, extracellular fluid and cell membrane, and the external environment in which they live is extracellular fluid. The electromagnetic characteristics of biological tissues refer to the dielectric response characteristics of cells passively generating polarization reactions under the action of electromagnetic fields. Due to the special structure of biological tissue, its electromagnetic properties are also different, and the electromagnetic properties of biological tissue have passive characteristics dependent on frequency. Biological tissue has relaxation in three frequency bands α, β, and γ, and t...
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IPC IPC(8): A61B5/05
CPCA61B5/05
Inventor 王旭刘承安宣杨张志美杨丹
Owner NORTHEASTERN UNIV
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