CN111493869A - Ultra-bandwidth radar navigation imaging system and method based on respiratory signals - Google Patents
Ultra-bandwidth radar navigation imaging system and method based on respiratory signals Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
- A61B5/7207—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/037—Emission tomography
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4417—Constructional features of apparatus for radiation diagnosis related to combined acquisition of different diagnostic modalities
Abstract
The invention belongs to the technical field of medical imaging, and particularly provides a super-bandwidth radar navigation imaging system and method based on respiratory signals, wherein super-bandwidth frequency band waves are generated firstly and are transmitted to a target object through a radar antenna to form transmitted waves; then, after the reflected wave is modulated and digitized, the reflected wave and the ultra-bandwidth frequency band wave are subjected to correlation analysis, and finally a respiratory signal is obtained through analysis; and finally, carrying out tracking navigation scanning on the target in real time according to the breathing signal so as to reconstruct target imaging. The device of the scheme has the advantages of simplicity, low cost and the like, and does not occupy the scanning time of the device, thereby saving the scanning time of the patient; on the other hand, various modes of binding the magnetic resonance system on the abdomen are not needed, signal acquisition does not need to be tightly attached to the body of a patient or a breath is needed, and the magnetic resonance system is in a non-contact type, so that the magnetic resonance system is very convenient for doctors and patients to operate, is more flexible to use, improves user experience, and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of medical imaging, and particularly relates to a super-bandwidth radar navigation imaging system and method based on respiratory signals.
Background
The abdomen imaging in the current medical imaging system has obvious breathing motion artifacts in any way, and the artifacts can cause low medical image quality and are not beneficial to the later examination and diagnosis of diseases by doctors. Therefore, respiratory gating is often adopted to acquire high-definition medical images of patients in order to reduce respiratory motion artifacts, and the acquisition of respiratory signals is indispensable in an abdominal imaging navigation system.
Current respiratory signal's collection equipment is given first place to the sensor, and contact sensor applications such as temperature sensor, flow sensor, voltage formula sensor and displacement sensor especially are the most extensive, and they mostly all dress complicacy, and the price is comparatively expensive moreover. The traditional sensor receives respiratory waves with a certain amplitude generated by respiratory motion of a patient in a respiratory gating mode, and the effect of synchronous acquisition is achieved in order to obtain a clear abdominal image, so that the data of the patient are acquired when the respiratory waves are between the upper limit and the lower limit of a certain threshold (generally 75% of the time of the end expiration is selected), and therefore, artifacts generated on the abdominal image due to the respiratory motion can be reduced to the maximum extent. Although the breathing sensor is simple to operate, the patient is worn by the abdominal belt in a contact mode, and the compression and release of the abdominal belt gas are easily affected by the self movement of the patient, so that the sensed breathing movement is not completely accurate, and an error is generated in triggering the breathing gating.
In particular, during the scanning process of a scanner of a magnetic resonance system, in order to reconstruct a clear image, the scanner repeatedly transmits a series of radio frequency pulse sequences within a long scanning time, and then reconstructs an image in a fourier transform mode. When Magnetic Resonance Imaging (MRI) images the abdomen, the respiratory motion is at different times within the MRI radio frequency pulse sequence cycle, and the obtained image signals come from different times in the respiratory process, which finally results in serious motion artifacts in the images obtained by superimposing the image signals acquired by a plurality of times of different acquisition times. Moreover, during the scanning process, the imaging object is required to be kept in a still state all the time, i.e. the imaging object is required to be kept in a closed gas still state. The user experience is low, and the market application expansion is severely limited.
Disclosure of Invention
The invention aims to solve the problems of low imaging precision and inconvenient use in the prior art.
Therefore, the invention provides a super-bandwidth radar navigation imaging system based on respiratory signals, which comprises: the radar scanning device comprises a pulse generation module, a radar antenna module, a signal processing module and a scanning module;
the pulse generation module is used for generating nano pulse waves and modulating the nano pulse waves into ultra-bandwidth frequency band waves;
the radar antenna module comprises an antenna transmitting unit and an antenna receiving module, wherein the antenna transmitting unit is used for transmitting the ultra-bandwidth frequency band wave to a target object and reflecting the ultra-bandwidth frequency band wave, and the antenna receiving module is used for receiving a reflected wave reflected from the target;
the signal processing module is used for carrying out correlation analysis on the reflected wave after the reflected wave is modulated and digitized and the ultra-bandwidth frequency band wave to finally obtain a respiratory signal;
the scanning module is used for carrying out tracking navigation scanning on the target in real time according to the breathing signal so as to reconstruct target imaging.
Preferably, the nano-pulse wave adopts a single-shock pulse wave in the form of a pseudo-random M-sequence code.
Preferably, the system further comprises a signal transmission module, wherein the signal transmission module is used for converting the respiration signal into an optical signal and transmitting the optical signal to the scanning module in a wired mode or an intermediate wireless mode.
Preferably, the scanning module comprises MRI, PET-MR or CT.
Preferably, the target object is a liver surface in the abdomen of a human body.
Preferably, the pulse transmitting end of the radar antenna module is fixedly connected with the scanning end of the scanning module.
Preferably, the correlation analysis specifically includes signal identification and signal separation;
the signal identification includes: let the transmitted signal be STThe received signal is SRTheir correlation was calculated as follows (1):
wherein ● is a dot-by-dot symbol, ○ is a convolution symbol, τ is a sampling time interval, and t is an absolute time axis;
the signal separation comprises: by calculating the correlation coefficient matrix Q { R) of RxyXY(τ) }, calculating a diagonal matrix D according to the matrix eigenvector S, wherein the formula is as follows:
D＝S-1Q{Rxy(τ)}S (2)
calculating time information of reflection levels of different tissue layers according to the characteristic value of the diagonal matrix:
M(τ)＝λQ(τ) (3)
and mapping the reflection time information to distance information, and extracting layer information mainly representing the respiratory state through principal component analysis to obtain respiratory displacement information.
The invention also provides a respiratory signal-based ultra-bandwidth radar navigation imaging method, which comprises the following steps:
s1: generating ultra-bandwidth frequency band waves and transmitting the ultra-bandwidth frequency band waves to a target object through a radar antenna to form reflected waves;
s2: receiving, mediating and digitizing the reflected wave, and performing correlation analysis on the reflected wave and the ultra-bandwidth frequency band wave, and finally analyzing to obtain a respiratory signal;
s3: and carrying out tracking navigation scanning on the target in real time according to the respiratory signal so as to reconstruct target imaging.
Preferably, the step S1 specifically includes: firstly, generating a nanometer pulse wave of a pseudorandom M sequence code, and then converting the pseudorandom M sequence code into a single-impact pulse by adding feedback to an input current signal shift register.
Preferably, the step S3 specifically includes: initializing configuration parameters of a scanning module, judging whether a scanning trigger point is reached or not according to a trigger threshold value and the amplitude of a currently detected respiratory signal, outputting a collection gating signal to track, navigate and scan a target if the scanning trigger point is reached, and otherwise, not triggering.
The invention has the beneficial effects that: the ultra-bandwidth radar navigation imaging system and method based on the respiratory signal provided by the invention are characterized in that ultra-bandwidth frequency band waves are generated firstly and are transmitted to a target object through a radar antenna to form transmitted waves; then, after the reflected wave is modulated and digitized, the reflected wave and the ultra-bandwidth frequency band wave are subjected to correlation analysis, and finally a respiratory signal is obtained through analysis; and finally, carrying out tracking navigation scanning on the target in real time according to the breathing signal so as to reconstruct target imaging. The device of the scheme has the advantages of simplicity, low cost and the like, and does not occupy the scanning time of the device, thereby saving the scanning time of the patient; on the other hand, various modes of binding the magnetic resonance system on the abdomen are not needed, signal acquisition does not need to be tightly attached to the body of a patient or a breath is needed, and the magnetic resonance system is in a non-contact type, so that the magnetic resonance system is very convenient for doctors and patients to operate, is more flexible to use, improves user experience, and has wide application prospect.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a functional schematic diagram of an ultra-wideband radar navigation imaging system and method based on respiratory signals according to the present invention;
FIG. 2 is a schematic diagram of signal acquisition of the ultra-wideband radar navigation imaging system and method based on respiratory signals according to the present invention;
FIG. 3 is a real object diagram of a radar antenna of the ultra-wideband radar navigation imaging system and method based on respiratory signals;
FIG. 4 is a schematic diagram of the installation of the radar antenna of the ultra-wideband radar navigation imaging system and method based on respiratory signals according to the present invention;
FIG. 5 is a schematic diagram of signals of different respiratory states of the ultra-wideband radar navigation imaging system and method based on respiratory signals according to the present invention;
FIG. 6 is a schematic structural installation diagram of the ultra-wideband radar navigation imaging system and method based on respiratory signals.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The invention provides a super-bandwidth radar navigation imaging system based on a respiratory signal, which comprises: the radar scanning device comprises a pulse generation module, a radar antenna module, a signal processing module and a scanning module;
the pulse generation module is used for generating nano pulse waves and modulating the nano pulse waves into ultra-bandwidth frequency band waves;
the radar antenna module comprises an antenna transmitting unit and an antenna receiving module, wherein the antenna transmitting unit is used for transmitting the ultra-bandwidth frequency band wave to a target object and reflecting the ultra-bandwidth frequency band wave, and the antenna receiving module is used for receiving a reflected wave reflected from the target;
the signal processing module is used for carrying out correlation analysis on the reflected wave after the reflected wave is modulated and digitized and the ultra-bandwidth frequency band wave to finally obtain a respiratory signal;
the scanning module is used for carrying out tracking navigation scanning on the target in real time according to the breathing signal so as to reconstruct target imaging.
Ultra Wide Band (UWB) Radar, Ultra wideband Radar for short. A radar apparatus having a fractional bandwidth of transmission (FBW) greater than 0.25. The waveform signals generated by the ultra-wideband radar are commonly used in three ways:
a. impulse pulses, transient currents with extremely short generation and extinction times, which are only hundreds of microseconds to nanoseconds;
b. pseudo-random pulses, each transmitted at a different pulse frequency but with a calculable law;
c. chirp (chirp).
Due to the interference of the breathing cycle signal, the imaging of the abdomen has obvious motion artifacts and the image quality is low. Therefore, a respiratory detection device is needed to guide image acquisition, capture 75% of the end expiration time (at this time, it is regarded as respiratory still), and start image scanning acquisition, so as to improve the imaging quality of parts such as the abdomen, and this step is called as navigation imaging. However, the present technical solution is described by taking MRI (magnetic resonance imaging) equipment and a respiratory navigation system of an abdominal imaging part in the environment as an example, and is applicable to any other medical imaging scene system requiring all respiratory navigation, such as a respiratory imaging navigation system of PET (positron emission Tomography, one of the most advanced international medical image diagnostic apparatuses) or CT (Computed Tomography).
Fig. 1 shows a schematic diagram of a navigator imaging system particularly incorporating an MRI scanning module. Firstly, a pulse generation module, namely a UWB pulse generation module is used for generating nano pulse waves and modulating the nano pulse waves into ultra-bandwidth frequency band waves. Then the ultra-wideband frequency band wave is transmitted to the heart part or the abdomen of the human body through a UWB transmitting antenna, namely an antenna transmitting unit. The pulse generation module and the radar antenna module are both arranged on the MRI scanning head and move synchronously. The wave reflected from the surface of the human body is received by a UWB receiving antenna, namely an antenna receiving module, and then the signal conversion is carried out through a receiver, and correlation analysis is carried out in a signal processing module to extract a gating signal. Specifically, the respiratory signal is separated by principal component analysis, and then the gating signal is calculated by derivation and equalization of the adjacent region. And finally, the gating signals are transmitted to an upper computer through a wireless transmission or light transmission module, and the upper computer controls the MRI scanning module to scan the human body and output imaging according to the gating signals corresponding to the respiratory signals. According to the scheme, equipment does not need to be in contact with a human body, and the scanning head automatically triggers to scan the human body according to the gate control signal.
The number of the radar antenna modules may be more than one, or not only one.
In a preferred scheme, the nano pulse wave is a single shock pulse wave in the form of a pseudo-random M sequence code. The pulse signal generated by the UWB pulse generation module in the system adopts a pseudo-random M sequence code, and the pulse has the characteristics of good anti-interference performance, strong time delay, insignificant distance Doppler coupling and the like. The M sequence code is converted into the single-impulse pulse by adding feedback to the input current signal shift register, and the method has the characteristics of simplicity and quickness.
As shown in fig. 4, for the optimal effect of receiving and transmitting, and at the same time reducing the influence of eddy current interference and the like on the magnetic resonance system, it is designed as a dual-vertebral horn radar, which is responsible for the transmission of UWB pulses and at the same time for the reception of reflected signals.
Preferably, the scanning module comprises MRI, PET-MR or CT. The radar antenna is embedded in the scanning module to work cooperatively. The target object is the surface of the liver organ in the abdomen of the human body. Of course, it may also be the heart, lungs, etc.
Preferably, the system further comprises a signal transmission module, wherein the signal transmission module is used for converting the respiration signal into an optical signal and transmitting the optical signal to the scanning module in a wired manner. The pulse signal who gathers transmits away through wired optical cable, prevents that electromagnetic interference from influencing the signal acquisition precision. Wireless transmission may also be used. And will not be described in detail herein.
In a preferred scheme, a pulse transmitting end of the radar antenna module is fixedly connected with a scanning end of the scanning module. As shown in fig. 2 to 4 in particular, the person lies on an MR (magnetic resonance) machine tool, and the imaging system is installed in a magnetic resonance room or a working room of a CT apparatus and is designed to be integrated into an existing magnetic resonance or CT system. For a magnetic resonance system, because the magnetic resonance check points are imaged at the midpoint of the magnet, the radar antenna is placed on the inner wall of the aperture magnet gradient polarity midpoint aperture. The system such as CT is also installed at the axial right center position point of the scanning imaging. Antenna configuration is a fixedly mounted device of an Antenna, designed into the cavity of a magnetic resonance scanner. MR transmit/receive coil stands for transmit and receive coil for magnetic resonance.
Preferably, the correlation analysis specifically includes signal identification and signal separation;
the signal identification includes: let the transmitted signal be STThe received signal is SRTheir correlation was calculated as follows (1):
wherein the content of the first and second substances,●in order to multiply the sign by a point,○is a convolution symbol, τ is a sampling time interval, and t is an absolute time axis;
the signal separation comprises: by calculating the correlation coefficient matrix Q { R) of RxyXY(τ) }, calculating a diagonal matrix D according to the matrix eigenvector S, wherein the formula is as follows:
D＝S-1Q{Rxy(τ)}S (2)
calculating time information of reflection levels of different tissue layers according to the characteristic value of the diagonal matrix:
M(τ)＝λQ(τ) (3)
mapping to distance information according to the reflection time information. And extracting layer information mainly representing the respiratory state through principal component analysis to obtain respiratory displacement information.
The system itself periodically transmits and receives a pseudo-random signal and then calculates the correlation of the received signal with the transmitted signal. The finally extracted respiratory displacement information is shown in fig. 5, wherein a section a shows normal respiration, a section B shows deep respiration, a section C shows an increase in respiratory rate, a section D shows breath holding, and a section E shows normal respiration. And finally, calculating and outputting a gating signal according to the respiratory displacement information. And extracting a continuous time respiration signal S (t), and obtaining a gating signal of the respiration signal through a detection algorithm. The specific summary is as follows:
firstly, the configuration parameters are initialized according to the breathing signal configuration parameters set by upper software, the rising edge trigger or the falling edge trigger is preset, so that the difference is that the expiration period or the inspiration period triggers the acquisition, and meanwhile, the trigger amplitude percentage is preset as D, so that the judgment is that the acquisition is started in the expiration or inspiration period (for example, the acquisition is triggered at the end of expiration, namely the peak value with the amplitude of 75% at the rising edge).
And judging whether the curve rises or falls according to the difference by calculating the difference between the adjacent point of DeltaT and the adjacent point of N × DeltaT. The N value is selected to be related to the actual testing Delta, and N is taken to prevent the adjacent threshold value fluctuation from causing wrong judgment, and relatively macroscopic observation data change exists. DeltaT represents the sampling interval time. And then judging whether a trigger point is reached or not according to the trigger threshold value and the current amplitude value, and determining whether a collection gating signal is output or not.
According to the preferred scheme, the UWB equipment works in a magnetic resonance system room, the magnetic field of the magnetic resonance system can affect the acquisition of signals and the work of a circuit, and in turn, the UWB equipment can affect the normal work of the magnetic resonance system. Therefore, the present invention requires a magnetic shielding design for the hardware circuit of the patch device. It comprises two parts:
1) and (5) shielding the circuit board. (different imaging equipment, corresponding shielding layer designs are different, shielding in magnetic resonance is realized by magnetic shielding, system eddy current is small, and the like, shielding in CT mainly plays a role in ray protection, prevents the system ray imaging image and also prevents the ray from imaging the electronic device per se.)
2) Shielding treatment of parts: except for a display screen and a plug interface (such as an optical fiber interface and a charging port of photoelectric conversion) which need to be exposed, other related parts need to be shielded by special magnetic shielding materials, and an electro-optical converter needs to be wrapped by copper materials according to an optical fiber transmission mode.
In addition, the battery also needs to be wrapped by a copper material.
Fig. 6 is a schematic diagram of the equipment installation after the shielding is added, and the left figure shows that the hardware acquisition equipment is placed on the inner aperture of the magnetic resonance (refer to fig. 3), and the hardware acquisition equipment consists of two major parts, namely a circuit board and a shielding layer in the right figure.
The invention also provides a super-bandwidth radar navigation imaging method based on the respiratory signal, which is characterized by comprising the following steps:
s1: generating super-bandwidth frequency band waves and transmitting the super-bandwidth frequency band waves to the surface of a target object through a radar antenna to form transmitted waves;
s2: after the reflected wave is modulated and digitized, the reflected wave and the ultra-bandwidth frequency band wave are subjected to correlation analysis, and finally a respiratory signal is obtained;
s3: and carrying out tracking navigation scanning on the target in real time according to the respiratory signal so as to reconstruct target imaging.
The specific working process is as follows:
1) the UWB pulse generation module firstly generates a pulse signal source and then modulates the pulse signal source into a pseudo-random pulse in an ultra-bandwidth mode. 2) The UWB radar transmitting antenna is responsible for transmitting the pseudo-random pulse; 3) after the ultra-wideband signal is absorbed by the human body and reflected and diffracted, the UWB radar receiving antenna receives the signal reflected from the human body; 4) after demodulation and digitization are carried out on the hardware system, correlation analysis is carried out on the hardware system and the originally transmitted pulse signal, and finally the respiratory signal is obtained. 5) Since the UWB device needs to operate in a magnetic field environment, the breathing signal needs to be converted into an optical signal and transmitted to the outside of the magnetic resonance room. 6) Outdoor, the optical signal is restored into a breathing signal through photoelectric conversion and transmitted to an upper computer; 7) the breathing signal controls the magnetic resonance scanning system to complete the imaging scanning work of the abdomen. It should be noted that the upper computer generally refers to a PC, the PC receives a respiration signal waveform, the respiration gating software in the PC outputs a trigger signal, and starts the MRI apparatus to scan, and how the upper computer and the respiration gating software control the output of the trigger signal and further start the MRI scan belongs to the prior art, and is not described herein again.
The invention has the beneficial effects that: the ultra-bandwidth radar navigation imaging system and method based on the respiratory signal provided by the invention are characterized in that ultra-bandwidth frequency band waves are generated firstly and are transmitted to a target object through a radar antenna to form transmitted waves; then, after the reflected wave is modulated and digitized, the reflected wave and the ultra-bandwidth frequency band wave are subjected to correlation analysis, and finally a respiratory signal is obtained through analysis; and finally, carrying out tracking navigation scanning on the target in real time according to the breathing signal so as to reconstruct target imaging. The device of the scheme has the advantages of simplicity, low cost and the like, and does not occupy the scanning time of the device, thereby saving the scanning time of the patient; on the other hand, various modes of binding the magnetic resonance system on the abdomen are not needed, signal acquisition does not need to be tightly attached to the body of a patient or a breath is needed, and the magnetic resonance system is in a non-contact type, so that the magnetic resonance system is very convenient for doctors and patients to operate, is more flexible to use, improves user experience, and has wide application prospect.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (10)
1. An ultra-bandwidth radar navigation imaging system based on respiratory signals, comprising: the radar scanning device comprises a pulse generation module, a radar antenna module, a signal processing module and a scanning module;
the pulse generation module is used for generating nano pulse waves and modulating the nano pulse waves into ultra-bandwidth frequency band waves;
the radar antenna module comprises an antenna transmitting unit and an antenna receiving module, wherein the antenna transmitting unit is used for transmitting the ultra-bandwidth frequency band wave to a target object and reflecting the ultra-bandwidth frequency band wave, and the antenna receiving module is used for receiving a reflected wave reflected from the target;
the signal processing module is used for carrying out correlation analysis on the reflected wave after the reflected wave is modulated and digitized and the ultra-bandwidth frequency band wave to finally obtain a respiratory signal;
the scanning module is used for carrying out tracking navigation scanning on the target in real time according to the breathing signal so as to reconstruct target imaging.
2. The respiratory signal-based ultra-wideband radar navigation imaging system of claim 1, wherein: the nano pulse wave adopts a single shock pulse wave in a pseudo-random M sequence code form.
3. The respiratory signal-based ultra-wideband radar navigation imaging system of claim 1, wherein: the system also comprises a signal transmission module, wherein the signal transmission module is used for converting the breathing signal into an optical signal and transmitting the optical signal to the scanning module in a wired mode or an intermediate wireless mode.
4. The respiratory signal-based ultra-wideband radar navigation imaging system of claim 1, wherein: the scanning module includes MRI, PET-MR or CT.
5. The respiratory signal-based ultra-wideband radar navigation imaging system of claim 1, wherein: the target object is the surface of the liver in the abdomen of the human body.
6. The respiratory signal-based ultra-wideband radar navigation imaging system of claim 1, wherein: and the pulse transmitting end of the radar antenna module is fixedly connected with the scanning end of the scanning module.
7. The respiratory signal-based ultra-wideband radar navigation imaging system of claim 1, wherein: the correlation analysis specifically comprises signal identification and signal separation;
the signal identification includes: let the transmitted signal be STThe received signal is SRTheir correlation was calculated as follows (1):
wherein ● is a dot-by-dot symbol, ○ is a convolution symbol, τ is a sampling time interval, and t is an absolute time axis;
the signal separation comprises: by calculating the correlation coefficient matrix Q { R) of RxyXY(τ) }, calculating a diagonal matrix D according to the matrix eigenvector S, wherein the formula is as follows:
D＝S-1Q{Rxy(τ)}S (2)
calculating time information of reflection levels of different tissue layers according to the characteristic value of the diagonal matrix:
M(τ)＝λQ(τ) (3)
and mapping the reflection time information to distance information, and extracting layer information mainly representing the respiratory state through principal component analysis to obtain respiratory displacement information.
8. A super-bandwidth radar navigation imaging method based on respiratory signals is characterized by comprising the following steps:
s1: generating ultra-bandwidth frequency band waves and transmitting the ultra-bandwidth frequency band waves to a target object through a radar antenna to form reflected waves;
s2: receiving, mediating and digitizing the reflected wave, and performing correlation analysis on the reflected wave and the ultra-bandwidth frequency band wave, and finally analyzing to obtain a respiratory signal;
s3: and carrying out tracking navigation scanning on the target in real time according to the respiratory signal so as to reconstruct target imaging.
9. The method according to claim 8, wherein the step S1 specifically includes: firstly, generating a nanometer pulse wave of a pseudorandom M sequence code, and then converting the pseudorandom M sequence code into a single-impact pulse by adding feedback to an input current signal shift register.
10. The ultra-bandwidth radar navigation imaging method based on the respiratory signal is characterized in that the step S3 specifically comprises the following steps: initializing configuration parameters of a scanning module, judging whether a scanning trigger point is reached or not according to a trigger threshold value and the amplitude of a currently detected respiratory signal, outputting a collection gating signal to track, navigate and scan a target if the scanning trigger point is reached, and otherwise, not triggering.
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| CN112315449A (en) * | 2020-11-24 | 2021-02-05 | 上海联影医疗科技股份有限公司 | Magnetic resonance imaging method, system, electronic device, and storage medium |
| CN112946633A (en) * | 2021-01-29 | 2021-06-11 | 上海联影医疗科技股份有限公司 | Radar sensor, magnetic resonance imaging apparatus, and magnetic resonance imaging system |
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