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CN-116625975-B - Terahertz biological tissue imaging system and imaging method based on super-surface antenna

CN116625975BCN 116625975 BCN116625975 BCN 116625975BCN-116625975-B

Abstract

The invention discloses a terahertz biological tissue imaging system and method based on a super-surface antenna. The terahertz biological tissue imaging system comprises a terahertz signal generator, an intelligent system control device, a terahertz signal transmitter, a terahertz signal receiver, a data acquisition module and an intelligent perception signal processing module, wherein the terahertz signal generator is used for generating ultra-wideband terahertz wave signals, the intelligent system control device is used for controlling the terahertz signal generator to continuously generate ultra-wideband terahertz wave signals, the terahertz signal transmitter is used for carrying out programmable modulation on the ultra-wideband terahertz wave signals and then transmitting the ultra-wideband terahertz wave signals to biological tissue organs, the terahertz signal receiver is used for receiving terahertz biological signals scattered inside and around the biological tissue organs and modulating the received terahertz biological signals, and the intelligent perception signal processing module is used for processing the terahertz biological signals to obtain terahertz images of the biological tissue organs. The invention solves the problems of narrow bandwidth and low gain in the corresponding technology.

Inventors

  • WANG LULU

Assignees

  • 深圳技术大学

Dates

Publication Date
20260512
Application Date
20230523

Claims (7)

  1. 1. A terahertz biological tissue imaging system based on a super-surface antenna, comprising: the terahertz signal generator is used for generating an ultra-wideband terahertz wave signal; The intelligent system control device is used for controlling the terahertz signal generator to continuously generate an ultra-wideband terahertz wave signal; The terahertz signal transmitter is used for carrying out programmable modulation on the ultra-wideband terahertz wave signal and then transmitting the ultra-wideband terahertz wave signal to a biological tissue organ, and comprises a first super-surface control unit, a first terahertz super-surface unit and a terahertz transmitting antenna; The terahertz signal receiver is used for receiving terahertz biological signals scattered inside and around the biological tissue organ and modulating the received terahertz biological signals, and comprises a second super-surface control unit, a second terahertz super-surface unit and a terahertz receiving antenna; The first terahertz super-surface unit and the second terahertz super-surface unit comprise M x N super-surface cell unit arrays, wherein M is more than or equal to 2, and N is more than or equal to 2; The data acquisition module acquires the terahertz biological signals; The intelligent perception signal processing module is used for processing the terahertz biological signals to obtain terahertz images of the biological tissue organs; The method comprises the steps that any super-surface cell unit of a first terahertz super-surface unit is independently controlled through a first super-surface control unit, programmable modulation of ultra-wideband terahertz wave signals is achieved, the modulated terahertz signals are transmitted to a terahertz signal transmitting antenna and then are transmitted to biological tissue organs to be detected, terahertz biological signals scattered inside and around the biological tissue organs are modulated again through a second terahertz super-surface unit of a terahertz receiver, any super-surface cell unit of the second terahertz super-surface unit is independently controlled through the second super-surface control unit, modulation of the terahertz biological signals is achieved, the modulated terahertz biological signals are detected through a terahertz receiving antenna, and the detected terahertz biological signals are collected through a data collection module and transmitted to an intelligent sensing signal processing module.
  2. 2. The subsurface antenna-based terahertz biological tissue imaging system of claim 1, wherein the first subsurface control unit, the second subsurface control unit comprise a semiconductor substrate and an epitaxial layer on the surface of the semiconductor substrate, the epitaxial layer having ohmic electrodes and the subsurface cell unit array disposed thereon.
  3. 3. The terahertz biological tissue imaging system based on a subsurface antenna as set forth in claim 1, wherein the subsurface cell unit array comprises a first dielectric substrate, a first metal structure printed on the bottom of the first dielectric substrate, a second metal structure printed on the top of the first dielectric substrate, a second dielectric substrate, a third metal structure printed on the top of the second dielectric substrate, a third dielectric substrate, a first metal through hole distributed on the first dielectric substrate, and a second metal through hole distributed on the second dielectric substrate; The first metal structure is etched with a first gap groove, the second metal structure is etched with a second gap groove with the length of 1 multiplied by 4, the third metal structure is etched with a third gap groove with the length of 4 multiplied by 4, the center of the third gap groove is aligned with that of the fourth metal structure, the fourth metal structure is composed of a4 multiplied by 4 cell unit array with the spacing between adjacent cell units with the super surface.
  4. 4. The subsurface antenna-based terahertz biological tissue imaging system of claim 1, wherein the intelligent perception signal processing module comprises a deep convolutional neural network unit and a signal processing unit.
  5. 5. The subsurface antenna-based terahertz biological tissue imaging system of claim 1, further comprising an image display module for displaying the terahertz image.
  6. 6. The subsurface antenna-based terahertz biological tissue imaging system of claim 5, wherein the image display module comprises a two-dimensional image display unit, a three-dimensional image display unit, a depth convolution network-based image reconstruction unit, and a holographic digital signal-based image reconstruction unit.
  7. 7. The imaging method of the super-surface antenna-based terahertz biological tissue imaging system as set forth in any one of claims 1 to 6, comprising: Carrying out programmable modulation on the ultra-wideband terahertz wave signal generated by the terahertz signal generator through a first terahertz super-surface unit in the terahertz signal transmitter, and transmitting the ultra-wideband terahertz wave signal after transmission modulation to biological tissue organs; the scattering signals inside and around the biological tissue organ are modulated again by a second terahertz super-surface unit in the terahertz signal receiver; The modulated terahertz biological signal is detected by a terahertz receiving antenna in a terahertz signal receiver; The detected terahertz biological signals are collected by a data collection module; the acquired terahertz biological signals are subjected to original signal preprocessing and image reconstruction processing by an intelligent perception signal processing module and an image display module, and image reconstruction of an imaging target is realized by using a deep convolutional neural network and a holographic reconstruction algorithm based on data after data preprocessing.

Description

Terahertz biological tissue imaging system and imaging method based on super-surface antenna Technical Field The invention relates to the technical field of terahertz biological imaging, in particular to a terahertz biological tissue imaging system and method based on a super-surface antenna. Background In recent years, terahertz wave (0.1 to 10 thz) imaging has received increasing attention, mainly because terahertz waves have a unique ability to pass through a large amount of optically opaque dielectric materials, such as plastics, semiconductors, and the like. Compared with X-rays, terahertz waves have low energy, i.e., the human body and the object to be measured are not damaged under the irradiation of the terahertz waves. Because of the unique properties of the terahertz waves, the terahertz imaging technology has wide prospects in the application fields such as security inspection, biomedicine, industry and the like. The traditional terahertz imaging system generally uses focal plane array terahertz detection imaging or point-by-point mechanical scanning imaging, wherein the focal plane array terahertz detector has high requirements on the manufacturing process, high cost and weak anti-interference capability, the point-by-point mechanical scanning imaging only needs a single-pixel detector, and the imaging target is scanned and imaged in a sampling mechanical moving way. Terahertz detectors are core components of terahertz imaging systems, and common terahertz detectors mainly comprise a heat detector and a schottky diode detector. Where heat detectors have been put to practical use but with correspondingly slow speeds and low sensitivity, schottky diode detectors have a narrow bandwidth range. Therefore, under the requirements of high-speed, high-sensitivity and high-precision biomedical diagnosis application, the existing terahertz detector and an imaging system thereof have the problems of long time consumption, complex driving, large volume, low sensitivity and the like. The metamaterial is used as an artificial composite structure, has physical properties which are not possessed by natural materials, has a two-dimensional expression form of a super surface, can realize the control of electromagnetic waves, has a large space in structural design, and has great application value. With the rapid development of millimeter wave technology, metamaterial and super-surface antennas are receiving extensive attention at present. At present, few super-surface antennas suitable for terahertz imaging are provided, most of the super-surface antennas work in sub-6GHz frequency bands, and the defect of narrow axial ratio bandwidth exists. Disclosure of Invention In order to solve the technical problem of narrow bandwidth of a super-surface antenna in the prior art, the invention provides a terahertz biological tissue imaging system and an imaging method based on the super-surface antenna. The terahertz biological tissue imaging system based on the super-surface antenna provided by the invention comprises the following components: the terahertz signal generator is used for generating an ultra-wideband terahertz wave signal; The intelligent system control device is used for controlling the terahertz signal generator to continuously generate an ultra-wideband terahertz wave signal; The terahertz signal transmitter is used for programmable modulating the ultra-wideband terahertz wave signal and then transmitting the ultra-wideband terahertz wave signal to biological tissue organs; The terahertz signal receiver is used for receiving the terahertz biological signals scattered inside and around the biological tissue organ and modulating the received terahertz biological signals; The data acquisition module acquires the terahertz biological signals; and the intelligent perception signal processing module is used for processing the terahertz biological signals to obtain terahertz images of the biological tissue organs. Further, the terahertz signal transmitter comprises a first super-surface control unit, a first terahertz super-surface unit and a terahertz transmitting antenna. Further, the terahertz signal receiver includes a second subsurface control unit, a second terahertz subsurface unit, and a terahertz receiving antenna. Further, the first terahertz super-surface unit and the second terahertz super-surface unit comprise M x N super-surface cell unit arrays, M is more than or equal to 2, N is more than or equal to 2, any super-surface cell unit of the first terahertz super-surface unit is independently controlled through the first super-surface control unit, programmable modulation of ultra-wideband terahertz wave signals is achieved, any super-surface cell unit of the second terahertz super-surface unit is independently controlled through the second super-surface control unit, and modulation of terahertz biological signals is achieved. Further, the first and second super-surface control units comprise a semicon