CN105832331A - Non-contact cerebral hemorrhage detection device based on broadband antenna technology and detection method of detection device - Google Patents

Abstract

The invention discloses a non-contact cerebral hemorrhage detection device based on broadband antenna technology and a detection method thereof. The detection device includes a signal generating unit, a transmitting antenna and a receiving antenna, a signal collecting unit and a signal processing and displaying unit. The signal generation unit generates the excitation signal and the reference signal, and the transmitting antenna transmits the excitation signal in a directional manner. The signal penetrates the brain tissue, takes away the information of the cerebral hemorrhage, and is then captured by the receiving antenna; the signal acquisition unit detects the reference signal and the receiving signal, and the A The /D converter is converted into a digital signal; the signal processing and display unit compares the amplitude and phase of the two signals. The detection method of the device of the present invention detects the change of the relative permittivity of the intracranial tissue, so that the transmission coefficient of the signal changes, and the transmission coefficient between the transmitted signal and the received signal is obtained through the signal processing unit. The invention adopts the broadband technology, and the system working frequency band is 1.2GHz-2.1GHz, which improves the detection sensitivity and stability.

Description

Non-contact cerebral hemorrhage detection device and detection method based on broadband antenna technology

technical field

The invention relates to the technical field of biomedical medical equipment, in particular to a non-contact cerebral hemorrhage detection device based on broadband antenna technology and a detection method thereof.

Background technique

Cerebral hemorrhage refers to hemorrhage caused by rupture of blood vessels in the non-traumatic brain parenchyma. The causes are closely related to hyperlipidemia, diabetes, hypertension, aging of blood vessels, and smoking. According to the research of the World Health Organization, the incidence of stroke in my country is increasing at a rate of about 9% per year, of which cerebral hemorrhage accounts for 20% to 30% of all strokes, 30% of the patients die, and most of the 70% of the survivors stay. There are different degrees of sequelae such as motor impairment, cognitive impairment, and speech and swallowing impairment. If cerebral hemorrhage is treated in the early stage, it can effectively prevent the development and transmission of the disease, and greatly reduce the sequelae of stroke. The more timely the treatment, the better for the patient's body and recovery. Therefore, real-time monitoring of the severity of cerebral hemorrhage and timely evaluation of the development of cerebral hemorrhage are the key to the success of intensive care and rescue treatment.

At present, the most widely used examination methods for cerebral hemorrhage include ICP (intracranial pressure) measurement method and CT or MRI imaging method. The ICP detection method needs to put the pressure sensor into the brain, which causes damage and is susceptible to infection, and it is impossible to deduce whether the increase in intracranial pressure is cerebral hemorrhage, cerebral ischemia or cerebral edema. CT and MRI imaging methods have inspection lag and cannot deal with early acute cerebral hemorrhage, so patients often miss the best time for treatment, resulting in severe brain damage or even death, and there are inspections that are expensive and cannot be implemented at the bedside. Emergency on-site monitoring and other issues, so there is an urgent need for a non-contact, non-invasive cerebral hemorrhage detection method that can perform effective and continuous bedside monitoring.

The developing magnetic induction phase shift (MIPS) measurement method has the characteristics of miniaturization, non-contact and non-invasive, and it is a better method for detecting cerebral hemorrhage. However, since the conductivity of biological tissue is very small (0.1s/m~2s/m) near the frequency of 10MHz, the eddy current generated by the external magnetic field is very weak, and the secondary magnetic field generated by the eddy current is also very weak, resulting in low sensitivity of magnetic induction measurement , Poor stability, and susceptible to interference from external magnetic field, ambient temperature, external volume conductor coupling, etc. Moreover, this method usually uses a single frequency point as the detection basis, which has been interfered by random signals and has large errors. The sensitivity and stability of the detection system cannot meet the clinical needs, and it is difficult to effectively distinguish the severity of cerebral hemorrhage.

Based on theoretical analysis and experimental research, the present invention proposes a non-contact electromagnetic induction method based on broadband antenna technology to detect the severity of cerebral hemorrhage. The principle is based on the different dielectric properties of normal brain tissue and blood, resulting in different electromagnetic wave transmission characteristics. The detection method has high sensitivity, good stability and consistency, and high experimental repeatability. It provides basic conditions for the real-time monitoring of cerebral hemorrhage and the accurate and effective evaluation of the severity of cerebral hemorrhage and the development process of cerebral hemorrhage.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the shortcomings of low sensitivity, poor stability, and easy to be affected by external magnetic fields when measuring cerebral hemorrhage by the magnetic induction phase shift (MIPS) method, and propose a non-contact cerebral hemorrhage detection based on broadband antenna technology Device and detection method thereof.

A non-contact cerebral hemorrhage detection device based on broadband antenna technology includes a signal generating unit, a transmitting antenna and a receiving antenna, a signal collecting unit, and a signal processing and displaying unit.

The signal generating unit is a radio frequency microwave signal source, and the amplitude, frequency and phase can be adjusted. The signal generation unit generates an excitation signal and a detection signal, which are transmitted to the transmitting antenna and the signal acquisition unit respectively. In actual operation, the signal generation unit outputs a sine wave excitation signal with a constant power, a frequency range of 0-3 GHz, and a frequency sweep mode that operates in a continuously changing frequency.

The transmitting antenna and the receiving antenna have the same structure, and both the transmitting antenna and the receiving antenna are specially designed for the device of the present invention. The design of the antenna is based on the following considerations: the radiation beam of the antenna should cover the entire head, and in order to avoid external interference, the radiation direction of the antenna is unidirectional, and the beam width is 60 degrees; Broadband technology is used to provide support; the area of the antenna should be as small as possible, and it is easy to integrate into the entire detection system. Considering the above factors comprehensively, through simulation and experiments, the antenna form is finally selected as a microstrip antenna with side grounding. The overall length, width and height of the antenna are 49mm╳24mm╳14mm. The radiation layer and the ground layer are made of photolithographic printing plates, and the thickness is respectively 2mm, between the radiation layer and the ground layer is filled with high-density foam, the thickness is 10mm, the size of the radiation layer is 37mm╳16mm, and the width of one of the radiation layers is flush with the overall width of the antenna. The size of the ground plane is 49mm╳24mm, and the side ground wall is made of self-adhesive copper foil, which is set on the side where the width of the radiation layer is flush with the overall width of the antenna. The feed point is set in the middle of the antenna as a whole, penetrating the ground layer, high-density foam and radiation layer. The short-circuit wall grounding technology is used to reduce the area of the antenna, so that the antenna can be better integrated in the system. At the same time, the ultra-thick dielectric layer is used to increase the bandwidth of the antenna, which improves the detection sensitivity and stability.

The signal acquisition unit includes a frequency mixing receiver and an A/D converter. The frequency mixing receiver receives the reference signal output by the signal generating unit and the detection signal output by the receiving antenna, and then converts the signal through A/D after down-converting the signal. Converter into a digital signal, sent to the signal processing display unit.

The signal processing and display unit is a general-purpose computer with special software inside, including a signal processing unit and a signal display unit. The signal processing unit is a computer with software step by step, and the reference signal and detection signal transmitted by the signal acquisition unit For signal processing, the special software written in VB is used to perform amplitude discrimination and phase discrimination on the two groups of signals to obtain the amplitude difference and phase difference between the two, so as to obtain the transmission coefficient of the transmitting antenna and the receiving antenna, and compare the transmission coefficients before and after cerebral hemorrhage The change of the cerebral hemorrhage can monitor the severity of the cerebral hemorrhage, and finally transmit it to the signal display unit for display.

The two channels of the signal generation unit are respectively connected to the channel of the transmitting antenna and the signal acquisition unit through a transmission line, and the receiving antenna is connected to another channel of the signal acquisition unit through a transmission line. The signal acquisition unit is connected with the signal processing and display unit through a transmission line. All transmission lines are radio frequency coaxial cables.

Further, the working frequency band of the detection device is determined in such a way that after the system device is connected, the frequency range 1.2-2.0 GHz where the transmission coefficient of the two sets of antennas is greater than -30 dB. In this wide frequency band, there are many working frequency points for detecting cerebral hemorrhage, the frequency point spacing is reasonable, and the correlation between the detection results of each frequency point is small, so the detection stability of the system can be improved.

The detection method of the non-contact cerebral hemorrhage detection device based on broadband antenna technology, the specific implementation steps are as follows:

1) Place the head to be tested between the transmitting antenna and the receiving antenna, adjust the position and distance of the antenna so that the head is located on the line connecting the center of the antenna. The signal generator generates an excitation signal and a detection signal, which are transmitted to the transmitting antenna and the signal acquisition unit respectively, and the receiving antenna is connected to another channel of the signal acquisition unit, and all transmission lines adopt radio frequency coaxial cables.

2) The signal generation unit outputs a sine wave excitation signal with a constant output power, a frequency range of 0-3 GHz, a frequency sweep mode, and a continuous linear change in frequency. Directly transmit broadband electromagnetic signals, the electromagnetic waves pass through the entire brain area, and then are captured by the receiving antenna. The propagation of electromagnetic waves is affected by the dielectric constant and conductivity of intracranial tissue, and the dielectric constant and conductivity of blood are different from normal brain tissue. Therefore, the amplitude and phase of electromagnetic wave propagation will change before and after cerebral hemorrhage. Through broadband Antenna technology that can observe amplitude and phase changes over a wide operating frequency band.

3) The frequency mixing receiver of the signal acquisition unit receives the reference signal output by the frequency sweep signal source and the detection signal output by the receiving antenna, and sends it to the signal processing unit for processing after being converted by the A/D converter.

4) The signal processing unit processes the reference signal transmitted by the signal acquisition unit and the detection signal transmitted by the receiving antenna, performs amplitude discrimination and phase discrimination on the reference signal and the detection signal in the entire working frequency band, and obtains the difference between the two The amplitude difference and the phase difference are used to obtain the transmission coefficients of the transmitting antenna and the receiving antenna, and the severity of the cerebral hemorrhage can be monitored by comparing the changes of the transmission coefficients before and after cerebral hemorrhage.

As the amount of cerebral hemorrhage changes, both the amplitude and phase of the transmission coefficient will change, and the amplitude and phase changes are related to the individual. Therefore, the change in amplitude or phase is not compared separately, but the Euclidean distance of the transmission coefficient is used. To reflect the changes in the amount of cerebral hemorrhage, the amplitude information and phase information of the vector signal are fully utilized. The specific formula is as follows:

$\begin{array}{c}\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; =</span>{\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; S</span>}}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; -</span>{\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; S</span>}}}_{\mathrm{<span\; class="notranslate">\; b</span>}}\\ <span\; class="notranslate">\; =</span>\sqrt{<span\; class="notranslate">\; |</span>{\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; S</span>}}}_{\mathrm{<span\; class="notranslate">\; a</span>}}{<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; |</span>{\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; S</span>}}}_{\mathrm{<span\; class="notranslate">\; b</span>}}{<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; |</span>{\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; S</span>}}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; |</span>{\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; S</span>}}}_{\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; cos</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&theta;</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&theta;</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; )</span>}\end{array}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In the formula, is the transmission coefficient Euclidean distance before and after bleeding, is the vector value of the transfer coefficient after bleeding, is the vector value of the transmission coefficient before bleeding, is the amplitude value of the transmission coefficient after bleeding, is the amplitude value of the transmission coefficient before bleeding, θ _a is the phase value of the transmission coefficient after bleeding, and θ _b is the phase value of the transmission coefficient before bleeding.

5) The display unit displays the obtained results in real time, and judges the severity and development of the cerebral hemorrhage through the variation of the Euclidean distance.

The non-contact cerebral hemorrhage detection method based on broadband antenna technology proposed by the present invention is mainly based on the fact that the dielectric constant and conductivity of blood are different from normal brain tissue, and the transmission of electromagnetic waves is affected by electromagnetic induction, so that the antenna transmission coefficient of the system occurs. Changes, and changes in cerebral hemorrhage were detected based on the changing values of the transfer coefficient.

The advantages of the present invention lie in two aspects: one is that broadband technology is adopted, the system operating frequency is 1.2GHz to 2.0GHz, the sampling interval is 5MHz, and there are 261 frequency points in the operating frequency, and the final identification of the severity of cerebral hemorrhage is precisely through 261 The transmission parameters of each frequency point are comprehensively concluded that the use of broadband technology avoids the shortcomings of large random errors at a single frequency point and difficulty in determining the best measurement frequency in the magnetic induction phase shift (MIPS) measurement method; the second is the use of vector identification technology. In the process of detecting cerebral hemorrhage by transmission parameters, the amplitude and phase of transmission parameters are comprehensively adopted, and the influence of individual differences in cerebral hemorrhage is reduced by calculating the Euclidean distance of transmission coefficients, and useful information is better mined from test parameters . Therefore, the present invention can better improve the sensitivity and stability of the non-contact cerebral hemorrhage detection device.

Description of drawings

FIG. 1 is a schematic structural diagram of a non-contact cerebral hemorrhage detection device based on broadband antenna technology provided by the present invention;

Fig. 2 is the schematic diagram of the vector value Euclidean distance calculating method that the present invention adopts;

FIG. 3 is a schematic structural diagram of a microstrip antenna for transmitting and receiving cerebral hemorrhage detection signals provided by the present invention;

Fig. 4 is a schematic diagram of the effective working frequency band of the cerebral hemorrhage detection device;

Fig. 5 is a schematic diagram of the relationship curve between the Euclidean specific transmission coefficient and the amount of bleeding in one of the rabbits obtained from the experiment of detecting cerebral hemorrhage in rabbits provided by the embodiment of the present invention,

In the figure: 1 is the signal generating unit, 2-1 is the transmitting antenna, 2-2 is the receiving antenna, 3 is the signal acquisition unit, 3-1 is the frequency mixing receiver, 3-2 is the A/D converter, 4 is the Signal processing display unit, 4-1 is a signal processing unit, 4-2 is a signal display unit.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various replacements and changes made according to common technical knowledge and conventional means in this field shall be included in the protection scope of the present invention.

Example 1:

This embodiment discloses a non-contact cerebral hemorrhage detection device based on broadband antenna technology, which includes a signal generating unit 1 , a transmitting antenna 2 - 1 and a receiving antenna 2 - 2 , a signal collecting unit 3 and a signal processing and displaying unit 4 .

Concrete device structure and details The following models are preferred in this embodiment: the signal generating unit 1 is a vector signal generator, which adopts a commercially available AV1441 signal source, which has a wide range of transmitting signal frequencies, high frequency resolution and precision, As well as the advantages of low phase noise, it can realize linear frequency sweep output, and can output reference signals with equal amplitude and same phase at the same time, which can meet the requirements of the device system.

The transmitting antenna 2-1 and receiving antenna 2-2 are specially designed for the test system. The design of the antenna is based on the following considerations: the radiation beam of the antenna should cover the entire head, and in order to avoid external interference, the radiation direction of the antenna is unidirectional, and the beam width is 60 degrees; Broadband technology is used to provide support; the area of the antenna should be as small as possible, and it is easy to integrate into the entire detection system. Considering the above factors comprehensively, through simulation and experiments, the antenna form is finally selected as a microstrip antenna with side grounding. The overall length, width and height of the antenna are 49mm╳24mm╳14mm. The radiation layer and the ground layer are made of photolithographic printing plates, and the thickness is respectively 2mm, between the radiation layer and the ground layer is filled with high-density foam, the thickness is 10mm, the size of the radiation layer is 37mm╳16mm, and the width of one of the radiation layers is flush with the overall width of the antenna. The size of the ground plane is 49mm╳24mm, and the side ground wall is made of self-adhesive copper foil, which is set on the side where the width of the radiation layer is flush with the overall width of the antenna. The feed point is set in the middle of the antenna as a whole, penetrating the ground layer, high-density foam and radiation layer. Refer to Figure 3 for the schematic diagram of the microstrip antenna structure. The short-circuit wall grounding technology is used to reduce the area of the antenna, so that the antenna can be better integrated in the system. At the same time, the ultra-thick dielectric layer is used to increase the bandwidth of the antenna and improve the detection accuracy sensitivity and stability.

The signal acquisition unit 3 adopts a commercially available data collector of Agilent 34970A, which has a fast collection rate and high collection accuracy, can simultaneously collect the vector signals of two channels, and has strong scalability, and is applicable to the device of the present invention usage of.

The signal processing display unit 4 includes a signal processing unit 4-1 and a signal display unit 4-2. The main structure of the signal processing unit 4-1 is a vector signal calculation program based on VB language. The reference signal and the detection signal are converted into two-way digital sequences after passing through the data collector, and the FFT operation is performed in the software to obtain the amplitude and phase of the signal, and then The transmission coefficient is obtained by performing difference calculation on the two vector signals, and then the transmission coefficient of 0ml blood loss is used as the reference value, and the transmission coefficient of 1ml, 2ml and 3ml is used as the vector difference with the transmission coefficient of 0ml to obtain different bleeding volumes The Euclidean distance of the transmission coefficient under the conditions, and finally the signal display unit 4-1 displays it in real time.

The two channels of the signal generating unit 4-1 are respectively connected to the channels of the transmitting antenna 2-1 and the signal collecting unit 3 through a transmission line, and the receiving antenna 2-2 is connected to another channel of the signal collecting unit 3 through a transmission line. The signal acquisition unit 3 is connected to the signal processing and display unit 4 through a transmission line. All transmission lines are radio frequency coaxial cables.

Example 2:

The steps of the detection method of the non-contact cerebral hemorrhage detection device based on antenna technology in the embodiment of the present invention are as follows:

1) Turn on the detection device to warm up for 30 minutes, place the head under test at the center of the line connecting the transmitting antenna 2-1 and the receiving antenna 2-2, connect the vector signal source to the transmitting antenna 2-1 and the reference signal acquisition end, all All connections are radio frequency coaxial cables.

2) Set the output power of the vector signal source to 0dBm, the frequency range to 0-3000MHz, and output the sine wave excitation signal in linear frequency sweep mode. The reference signal directly enters the signal acquisition unit 3, and the excitation signal enters the signal acquisition unit 3 after passing through the transmitting antenna 2-1, the skull, and the receiving antenna 2-2. The changes in the overall dielectric constant and electrical conductivity of the brain are closely related. As the severity of cerebral hemorrhage increases, the tissue water content increases, the overall dielectric constant and electrical conductivity of the brain increase, and the amplitude and phase changes of the detected detection signals increase. Big.

3) The frequency mixing receiver 3-1 channel 1 of the signal acquisition unit 3 collects the reference signal output by the vector signal source, and the channel 2 collects the detection signal output by the receiving antenna 2-2, and the collected signal passes through the A/D converter 3- 2. Convert it into a vector digital signal and transmit it to the signal processing unit 4-1 for further analysis and processing of the data;

4) The signal processing unit 4-1 performs amplitude comparison and phase discrimination on the two-way vector digital signals to obtain the vector difference of the two-way signals, that is, the transmission coefficient. In the case of different blood loss, use the transmission coefficient in this case and the transmission coefficient of 0ml cerebral hemorrhage to make the vector difference to obtain the Euclidean distance of the transmission coefficient in different blood loss, and calculate the modulus of the Euclidean distance, and output to The signal display unit 4-2 performs real-time display.

5) The signal display unit 4-2 displays in real time the modulus of the Euclidean distance that changes with the degree of bleeding. The effective working frequency band of the cerebral hemorrhage detection device in the experiment is specifically shown in FIG. 4 .

Example 3:

The non-contact electromagnetic induction cerebral hemorrhage detection method based on broadband antenna technology of the present invention is further verified and explained by the following animal experiments:

1. Select and purchase 12 New Zealand white rabbits, weighing 2.1-2.5Kg.

2. Establish a rabbit model of cerebral hemorrhage injected with autologous blood. Rabbits were anesthetized by injecting 25% ethyl carbamate into the ear vein at a dose of 5ml/kg. Autologous blood was taken from rabbit femoral vein, and a little heparin sodium anticoagulant was added. Injection location: Based on the intersection point of the "cross suture" of the rabbit brain, open 6 mm to the right side along the coronal suture, and then parallel to the sagittal suture 1 mm behind is the puncture point, with a depth of 13 mm. Use a micro-injection pump to inject 1ml at a constant speed of 1ml/min, and inject three times. After each injection, use this system to measure the modulus of the vector difference signal caused by the amount of bleeding.

3. Figure 4 is a schematic diagram of the amplitude value of the transmission coefficient of one of the rabbits obtained from the experiment of detecting cerebral hemorrhage in 12 rabbits. It can be seen that the frequency range of 1.2GHz to 2.0GHz where the transmission coefficient is greater than -30dB, the energy of the excitation signal collected by the rabbit brain and the receiving antenna in this frequency band is relatively large, so the data in this frequency band is used for discrimination and analysis.

4. Figure 5 is a schematic diagram of the Euclidean distance vector difference of one of the rabbits obtained in the experiment of detecting cerebral hemorrhage in 12 rabbits. The Euclidean distance vector difference calculation method is to use the transmission coefficient of 1ml, 2ml and 3ml cerebral hemorrhage volume and the transmission coefficient of 0ml cerebral hemorrhage volume as vector difference respectively. It can be clearly seen the change of the Euclidean distance vector difference for different cerebral hemorrhage volumes. The average vector difference per 1ml cerebral hemorrhage volume reaches about 5dB, while the phase difference of 1ml cerebral hemorrhage volume measured by MIPS method generally does not reach 5° , and is usually a single frequency point measurement value, with a large random error.

It can be seen that the sensitivity of the electromagnetic induction cerebral hemorrhage detection method based on broadband antenna technology is improved by an order of magnitude compared with the MIPS detection method, and the reliability of the system is also improved. Due to the complexity of the experimental operation, the surgical operation of each rabbit cannot be completely consistent, so there are some differences in the amount of change in each rabbit, but the overall trend remains the same.

Claims (5)

1. noncontact cerebral hemorrhage based on a broadband antenna technology detection device, its feature exists In: include signal generating unit (1), launch antenna (2-1) with reception antenna (2-2), Signal gathering unit (3) and signal processing display unit (4)；

Described signal generating unit (1) is frequency microwave signal source, amplitude, frequency and phase place The most adjustable；Signal generating unit (1) produces pumping signal and detection signal, and point two-way is respectively It is transferred to launch antenna (2-1) and signal gathering unit (3)；

Described transmitting antenna (2-1) is consistent with reception antenna (2-2) structure, and antenna form is equal For the microstrip antenna of side ground connection, radiating layer and ground plane use lithographic printing version to make, radiate Using high-density foam to fill between layer and ground plane, side ground connection wall is self-adhesive Copper Foil, The distributing point penetrating ground plane, high-density foam and radiating layer is had in the middle part of antenna entirety；Described Launching between antenna (2-1) and reception antenna (2-2) is head, from launching antenna (2-1) Send electromagnetic wave signal and become detection signal by reception antenna (2-2) after whole brain area Capture；

Described signal gathering unit (3) is by mixing receiver (3-1) and A/D converter (3-2) Constituting, described mixing receiver (3-1) receives the reference exported by signal generating unit (1) The detection signal that signal and reception antenna (2-2) export, after then carrying out down coversion to signal Become digital signal by A/D converter (3-2), be sent to signal processing display unit (4)；

Described signal processing display unit (4) is internal with special-purpose software, comprises signal processing Unit (4-1) and signal display unit (4-2)；Described signal processing unit (4-1) loads Special signal is had to process software, the reference signal that signal gathering unit is transmitted and detection Signal carries out amplitude discrimination and phase demodulation；Described signal display unit (4-2) is display device, receives Signal after signal processing unit (4-1) also shows；

Two passages of described signal generating unit (1) are respectively by transmission line and transmitting antenna (2-1) passage with signal gathering unit (3) connects, and reception antenna (2-2) is by passing Defeated line is connected to signal gathering unit (3) another passage；Described signal gathering unit is passed through Transmission line is connected with signal processing display unit (4)；All of transmission line all uses radio frequency same Shaft cable.

A kind of noncontact brain based on broadband antenna technology the most according to claim 1 goes out Device is surveyed in blood examination, it is characterised in that: described transmitting antenna (2-1) and reception antenna (2-2) All use the microstrip antenna form of side ground connection；Antenna entirety length and width a height of 49mm 24mm 14mm, radiating layer makes with ground plane employing lithographic printing plate, and thickness is respectively 2mm；Radiation High-density foam is used to fill between layer and ground plane, thickness 10mm；Radiating layer size 37mm 16mm, a radiating layer wherein wide wide flush arrangement overall with antenna；Ground plane dimensions 49mm 24mm, side ground connection wall uses self-adhesive Copper Foil, is arranged on described radiation slice width and sky The width of line entirety flushes the side at place；Distributing point is arranged on the middle part that antenna is overall, penetrates and connects Stratum, high-density foam and radiating layer.

A kind of noncontact brain based on broadband antenna technology the most according to claim 1 goes out Device is surveyed in blood examination, it is characterised in that: described signal generating unit (1) is with linear frequency sweep pattern Running, output is certain, frequency range is 0～3000MHz and the sine wave of constant amplitude homophase Pumping signal and reference signal.

4. go out based on a kind of based on broadband antenna technology the noncontact brain described in claim 1 The detection method of device is surveyed in blood examination, it is characterised in that: include step content in detail below；

1) tested head is positioned between transmitting antenna (2-1) and reception antenna (2-2), adjusts All day, line position and distance, made head be positioned on center of antenna line, it is ensured that aerial radiation wave beam Cover whole head and aerial radiation direction is unidirectional；Signal generating unit (1) produces excitation Signal and detection signal, be transferred to launch antenna (2-1) and signal gathering unit (3) respectively；

2) signal generating unit (1) runs with frequency sweep mode, and output is certain, frequency model Enclosing is 0～3GHz and the sine wave exciting signal of frequency continuously linear change, and by broadband electricity Magnetic signal is by launching antenna (2-1) directional transmissions, and electromagnetic wave passes whole brain area, so Captured by reception antenna (2-2) afterwards；

3) the mixing receiver (3-1) of signal gathering unit (3) receives by signal generating unit (1) the detection signal that the reference signal exported and reception antenna (2-2) export, through A/D It is transferred to signal processing unit (4-1) after transducer (3-2) conversion process；

4) ginseng that signal gathering unit (1) described in signal processing unit (4-1) place reason exports Examine signal and detection signal that reception antenna (2-2) exports, in whole working band, right Reference signal carries out amplitude discrimination and phase demodulation with detection signal, obtains the two amplitude difference and phase contrast, Thus draw the transmission coefficient of described transmitting antenna (2-1) and reception antenna (2-2), pass through The relatively change of transmission coefficient before and after cerebral hemorrhage, monitors the order of severity of cerebral hemorrhage；And by vowing Amount authentication technique, obtains the situation of change of cerebral hemorrhage amount；

Described vector authentication technique uses transmission coefficient Euclidean distance to reflect the change of cerebral hemorrhage amount Change, concrete formula such as formula 1；

$\begin{array}{c}\mathrm{\&Delta;}\stackrel{\&RightArrow;}{S}={\stackrel{\&RightArrow;}{S}}_a-{\stackrel{\&RightArrow;}{S}}_b\\ =\sqrt{|{\stackrel{\&RightArrow;}{S}}_a{|}^2+|{\stackrel{\&RightArrow;}{S}}_b{|}^2-2\&CenterDot;\left|{\stackrel{\&RightArrow;}{S}}_a\right|\&CenterDot;\left|{\stackrel{\&RightArrow;}{S}}_b\right|\cos \left({\mathrm{\&theta;}}_a-{\mathrm{\&theta;}}_b\right)}\end{array}---\left(1\right)$

In formula,For transmission coefficient Euclidean distance before and after hemorrhage,For hemorrhage rear transmission coefficient Vector value,For the vector value of hemorrhage front transmission coefficient,For hemorrhage rear transmission coefficient Range value,For the range value of hemorrhage front transmission coefficient, θ_aPhase place for hemorrhage rear transmission coefficient Value, θ_bPhase value for hemorrhage front transmission coefficient；

5) result obtained is shown by signal display unit (4-2) in real time, by European The variable quantity of distance judges the order of severity and the development and change of cerebral hemorrhage.

5. go out based on a kind of based on broadband antenna technology the noncontact brain described in claim 4 The detection method of device is surveyed in blood examination, it is characterised in that: this method have employed broadband technology, system Operating frequency 1.2GHz～2.0GHz, sampling interval 5MHz, in operating frequency, use 261 The cerebral hemorrhage order of severity is differentiated by individual frequency transmission parameter.