WO2021226958A1 - Appareil et procédé d'imagerie ultrasonore - Google Patents

Appareil et procédé d'imagerie ultrasonore Download PDF

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Publication number
WO2021226958A1
WO2021226958A1 PCT/CN2020/090341 CN2020090341W WO2021226958A1 WO 2021226958 A1 WO2021226958 A1 WO 2021226958A1 CN 2020090341 W CN2020090341 W CN 2020090341W WO 2021226958 A1 WO2021226958 A1 WO 2021226958A1
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Prior art keywords
probe
vibration
vibrator
target object
pressure
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PCT/CN2020/090341
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English (en)
Chinese (zh)
Inventor
李金洋
李双双
袁永亮
张雷
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深圳迈瑞生物医疗电子股份有限公司
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Priority to PCT/CN2020/090341 priority Critical patent/WO2021226958A1/fr
Priority to CN202080000807.9A priority patent/CN114126492A/zh
Publication of WO2021226958A1 publication Critical patent/WO2021226958A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves

Definitions

  • the invention relates to ultrasound imaging equipment and methods.
  • Liver fibrosis is a pathological process from various chronic liver diseases to cirrhosis.
  • Transient Elastography can reflect the degree of liver fibrosis by detecting liver stiffness.
  • instantaneous elasticity has the characteristics of non-invasive, simple, fast, easy to operate, reproducible, safe and tolerable. It has been approved by WHO, AASLD, EASL, Chinese Medical Association for liver disease. It is recommended by the academic committee as an important method for clinical evaluation of hepatitis B and C virus-related liver fibrosis.
  • the probe has air vibration or sliding, the operator's human factors, etc. make the preload change, and the preload is no longer suitable for measurement.
  • the probe will not stop vibrating, resulting in accelerated aging of the probe, and inaccurate measurement results, and the operator cannot detect that the preload is not appropriate at this time, so that adjustments cannot be made quickly.
  • the embodiments of the present invention provide an ultrasonic imaging device and method to solve at least one of the above-mentioned problems.
  • an ultrasound imaging device including:
  • a vibration mechanism which drives the vibrator or the probe to vibrate to generate shear waves propagating in the target object
  • a transmitting circuit which excites the probe to transmit ultrasonic waves to the target object to detect the shear wave propagating in the target object;
  • a receiving circuit controls the probe to receive the ultrasonic echo returned from the target object to obtain an ultrasonic echo signal
  • a vibration state detection device that detects the pressure between the vibrator or the probe and the target object
  • a processor processes the ultrasonic echo signal to obtain the propagation parameter of the shear wave
  • the vibration state detection device detects the pressure between the vibrator or the probe and the target object during the period when the vibrator or the probe is vibrating, and obtains the pressure in the vibration;
  • the processor determines the vibration state of the vibrator or the probe according to the pressure in the vibration.
  • an ultrasound imaging device including:
  • a vibration mechanism which drives the vibrator or the probe to vibrate to generate shear waves propagating in the target object
  • a transmitting circuit which excites the probe to transmit ultrasonic waves to the target object to detect the shear wave propagating in the target object;
  • a receiving circuit controls the probe to receive the ultrasonic echo returned from the target object to obtain an ultrasonic echo signal
  • a vibration state detection device detects the vibration state of the vibrator or the probe while the vibrator or the probe is vibrating, and obtains vibration state data
  • a processor processes the ultrasonic echo signal to obtain the propagation parameter of the shear wave
  • the processor executes at least one of the following steps:
  • an ultrasound imaging device including:
  • a vibration mechanism which drives the vibrator or the probe to vibrate to generate shear waves propagating in the target object
  • a transmitting circuit which excites the probe to transmit ultrasonic waves to the target object to detect the shear wave propagating in the target object;
  • a receiving circuit controls the probe to receive the ultrasonic echo returned from the target object to obtain an ultrasonic echo signal
  • a vibration state detection device detects the vibration state of the vibrator or the probe while the vibrator or the probe is vibrating, and obtains vibration state data
  • a processor processes the ultrasonic echo signal to obtain the propagation parameter of the shear wave
  • the processor When the vibration state data indicates that the vibration state of the vibrator or the probe is abnormal, the processor performs at least one of the following steps:
  • the processor executes at least one of the following steps:
  • an ultrasound imaging device including:
  • a vibration mechanism which drives the vibrator or the probe to vibrate to generate shear waves propagating in the target object
  • a transmitting circuit which excites the probe to transmit ultrasonic waves to the target object to detect the shear wave propagating in the target object;
  • a receiving circuit controls the probe to receive the ultrasonic echo returned from the target object to obtain an ultrasonic echo signal
  • a vibration state detection device that detects the pressure between the vibrator or the probe and the target object
  • a processor processes the ultrasonic echo signal to obtain the propagation parameter of the shear wave
  • the vibration state detection device detects the pressure between the vibrator or the probe and the target object before the vibrator or the probe vibrates, and detects the vibrator or the probe after the vibrator or the probe vibrates. The pressure between the probe and the target object;
  • the processor is based on the pressure between the vibrator or the probe and the target object before the vibrator or the probe vibrates and the vibrator or the probe after the vibrator or the probe vibrates.
  • the pressure between the target objects determines whether the pressure between the vibrator or the probe and the target object is consistent before and after the vibrator or the probe vibrates.
  • an ultrasound imaging device including:
  • a vibration mechanism which drives the vibrator or the probe to vibrate under the control of a driving signal to generate a shear wave propagating in the target object;
  • a transmitting circuit which excites the probe to transmit ultrasonic waves to the target object to detect the shear wave propagating in the target object;
  • a receiving circuit controls the probe to receive the ultrasonic echo returned from the target object to obtain an ultrasonic echo signal
  • a vibration parameter detection device detects the actual value of the vibration parameter of the vibrator or the probe
  • a processor processes the ultrasonic echo signal to obtain the propagation parameter of the shear wave
  • the processor is further configured to: adjust the working parameters of the vibrator or the probe according to the actual value of the vibration parameter detected by the vibration parameter detection device and the target value of the vibration parameter to The actual value of the vibration parameter of the vibrator or the probe is changed so that the actual value of the vibration parameter is consistent with or tends to be consistent with the target value of the vibration parameter.
  • an ultrasound imaging method including:
  • the vibration state of the vibrator or the probe is determined according to the pressure in the vibration.
  • an ultrasound imaging method including:
  • an ultrasound imaging method including:
  • an ultrasound imaging method including:
  • the pressure between the vibrator or the probe and the target object before the vibrator or the probe vibrates and the pressure between the vibrator or the probe and the target object after the vibrator or the probe vibrates Determine whether the pressure between the vibrator or the probe and the target object is consistent before and after the vibrator or the probe vibrates.
  • an ultrasound imaging method including:
  • the actual value of the vibration parameter of the vibrator or the probe is detected, and the vibration parameter of the vibrator or the probe is adjusted according to the detected actual value of the vibration parameter of the vibrator or the probe and the target value of the vibration parameter.
  • the working parameter is used to change the actual value of the vibration parameter of the vibrator or the probe so that the actual value of the vibration parameter is consistent with or tends to be consistent with the target value of the vibration parameter.
  • the ultrasonic imaging equipment and method of the embodiments of the present invention detect the pressure of the probe between the target objects after the probe starts to vibrate to determine whether the probe has air vibration or sliding, and whether the measurement result is valid, and prevent the probe air vibration from affecting the service life of the probe , Improve the effectiveness of the elasticity measurement results; and adjust the channel signal of the probe according to the vibration signal to ensure the stability of the actual vibration of the probe, and further improve the accuracy of the elasticity detection.
  • Fig. 1 is a schematic structural block diagram of an ultrasonic imaging device according to an embodiment of the present invention
  • Figure 2 is a schematic principle diagram of an ultrasound imaging method according to an embodiment of the present invention.
  • Figure 3a is a schematic flow chart of instantaneous elasticity measurement
  • Figure 3b is a schematic schematic diagram of instantaneous elasticity measurement
  • FIG. 4 is a schematic flowchart of an ultrasound imaging method according to an embodiment of the present invention.
  • Fig. 5 is a schematic diagram of a pressure curve of a vibration process according to an embodiment of the present invention.
  • Fig. 6 is a schematic diagram of pressure curves before and after shear vibration according to an embodiment of the present invention.
  • Fig. 7 is a schematic diagram of the control principle of an ultrasonic imaging method according to an embodiment of the present invention.
  • Fig. 1 shows a schematic structural block diagram of an ultrasonic imaging device according to an embodiment of the present invention.
  • the ultrasonic imaging apparatus 10 may include:
  • the probe 100, the transmitting circuit 101, the vibration mechanism 102, the receiving circuit 103, the vibration state detection device 104, and the processor 105 can excite the probe 100 to transmit ultrasonic waves to the target object; the vibration mechanism 102 can excite the probe 100 to vibrate to generate shear waves propagating in the target object; the receiving circuit 103 can receive the ultrasonic echo returned from the target object through the probe 100, Thereby, ultrasonic echo signals/data are obtained; the vibration state detection device 104 can detect the actual value of the vibration parameter of the probe 100, such as the actual value of the pressure between the probe 100 and the target object.
  • the processor 105 processes the ultrasound echo signal/data to obtain an ultrasound image of the target object.
  • the vibrating mechanism 102 may not use the vibrating probe 100 but a vibrator (not shown) provided separately to generate a shear wave propagating in the target object.
  • the probe 100 will not be used to generate shear waves, but only to obtain ultrasound images of the target object and/or track the propagation of shear waves in the target object.
  • the probe 100 may include a transducer and a vibration device.
  • the transducer is used to receive instructions from the transmitting circuit 101 to transmit ultrasonic waves and/or to receive ultrasonic echoes, and the vibrating device is used to vibrate under the drive of the vibrating mechanism 102 to generate shear waves in the target object.
  • the vibration mechanism 102 may include a motor. Further, the vibration mechanism 102 may be connected to the probe 100 through a transmission mechanism. The vibration mechanism 102 drives the transmission mechanism to move after obtaining the driving signal, and the transmission mechanism drives the vibration device to vibrate.
  • the vibration mechanism 102 may also directly drive the transducer to vibrate to generate a shear wave propagating in the target object, that is, the vibrating device may be the transducer itself.
  • the vibration state detection device 104 may include at least one of the following: a pressure sensor, a displacement sensor, a speed sensor, an acceleration sensor, and so on.
  • the vibration parameter includes at least one of the following: pressure between the vibrator or the probe and the target object, the vibration frequency of the vibrator or the probe, the vibration displacement (vibration amplitude) of the vibrator or the probe, the vibration phase of the vibrator or the probe, the vibrator or the probe The duration of the vibration, the vibration speed of the vibrator or probe, and the vibration acceleration of the vibrator or probe, etc.
  • the ultrasound imaging device 10 may further include: a display 106, which may be used to display the ultrasound image obtained by the processor 105.
  • the aforementioned display 106 of the ultrasonic imaging device 10 may be a touch display screen, a liquid crystal display screen, etc., or may be an independent display device such as a liquid crystal display or a TV set independent of the ultrasonic imaging device 10, or For display screens on mobile phones, tablet computers and other electronic devices, and so on.
  • the ultrasound imaging device 10 may further include: a memory 107, which may be used to store the ultrasound image obtained by the processor 105.
  • the memory 107 may be a volatile memory (volatile memory), such as a random access memory (Random Access Memory, RAM); or a non-volatile memory (non-volatile memory), such as a read-only memory ( Read Only Memory (ROM), flash memory (flash memory), hard disk (Hard Disk Drive, HDD) or solid-state drive (Solid-State Drive, SSD); or a combination of the above types of memory, and provide instructions and data.
  • volatile memory such as a random access memory (Random Access Memory, RAM)
  • non-volatile memory such as a read-only memory ( Read Only Memory (ROM), flash memory (flash memory), hard disk (Hard Disk Drive, HDD) or solid-state drive (Solid-State Drive, SSD); or a combination of the above types of memory, and provide instructions and data.
  • ROM Read Only Memory
  • flash memory flash memory
  • HDD Hard Disk Drive
  • SSD solid-state drive
  • the ultrasonic imaging device 10 may further include: a transmission/reception selection switch 108, which is connected to the probe 100, the transmission circuit 101, the reception circuit 103, and the processor 105, and the processor 105 controls the transmission/reception selection switch 108 to turn the probe 100 is in communication with the transmitting circuit 101 or the receiving circuit 103.
  • a transmission/reception selection switch 108 which is connected to the probe 100, the transmission circuit 101, the reception circuit 103, and the processor 105, and the processor 105 controls the transmission/reception selection switch 108 to turn the probe 100 is in communication with the transmitting circuit 101 or the receiving circuit 103.
  • the ultrasound imaging device 10 may further include: a beam combining circuit 109, and the ultrasound echo signal/data obtained by the receiving circuit 103 is sent to the processor 105 after beam combining processing is performed by the beam combining circuit 109.
  • the processor 105 can be implemented by software, hardware, firmware, or a combination thereof, and can use circuits, single or multiple integrated circuits (ASICs), digital signal processors (Digital Signal Processors, DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), Central Processing Unit, At least one of a CPU), a controller, a microcontroller, and a microprocessor, so that the processor 105 can execute part or all of the steps in the ultrasound imaging in the various embodiments of the present application or any combination of the steps .
  • ASICs application specific integrated circuits
  • DSP Digital Signal Processors
  • DSPD Digital Signal Processing Device
  • PLD Programmable Logic Device
  • FPGA Field Programmable Gate Array
  • CPU Central Processing Unit
  • the ultrasonic imaging device 10 When the ultrasonic imaging device 10 according to the embodiment of the present invention is running, it can provide a corresponding operation interface for the operator to operate.
  • the above operation interface it can include controls corresponding to each slice group, such as marking marquee or menu bar, etc. , So that the operator can input operation instructions on the operation interface according to the actual use situation, so as to realize the ultrasonic imaging by the ultrasonic imaging device 10.
  • FIG. 2 shows a schematic principle diagram of an ultrasound imaging method according to an embodiment of the present invention.
  • the ultrasound imaging method may include:
  • the target object is obtained by conventional two-dimensional B-mode imaging to obtain the basic image of the target object, and then the appropriate section and the appropriate pressure between the probe and the target object before vibration are selected through the operation interface;
  • the operator holds the probe in hand, makes the probe contact the surface position of the target object corresponding to the target area, and executes an operation to trigger a single elasticity measurement;
  • the front-end control and processing module in the processor receives the instruction of the operation and sends it to the vibration control module A vibration command, the vibration control module sends a drive signal to the vibration mechanism on the probe according to the vibration command.
  • the vibration mechanism starts to work after receiving the drive signal.
  • the transmission mechanism connected to the vibration mechanism starts to move.
  • the transmission mechanism drives the vibration device to produce on the surface of the target object.
  • the front-end control and processing module transmits the scan control (timing or method) to the transmitting circuit according to the real-time example of the ultrasound imaging method of the present invention Send instructions, and the transmitter circuit receives the instructions to excite the transducer on the probe to emit ultrasonic waves.
  • the ultrasonic waves track the propagation of shear waves, continuously track and record the changes in the tissue displacement caused by the shear waves in the target area, and the ultrasonic waves are reflected by the target area Obtain the ultrasonic echo; the ultrasonic echo reaches the receiving circuit through the transducer on the probe, and the receiving circuit sends the obtained ultrasonic echo signal to the front-end control and processing module in the processor after beam-synthesizing processing through the beam-synthesis circuit;
  • the front-end control and processing module processes the ultrasonic echo to obtain the propagation parameters of the shear wave, such as shear wave velocity, shear wave modulus, shear wave attenuation, shear wave elasticity and shear wave viscosity, etc.; front end control And the processing module can store and send at least one propagation parameter of the shear wave to the display for display.
  • the ultrasound probe can also be used to obtain images of other modes of the target object, such as B images, color blood flow images, etc., and these images can be displayed together with the propag
  • the embodiment of the present invention also provides a computer-readable storage medium that stores a plurality of program instructions. After the plurality of program instructions are called and executed by the processor 105, the ultrasound in each embodiment of the present application can be executed. Part or all of the steps in the imaging method or any combination of the steps.
  • FIG. 3a shows a schematic flow chart of a transient elasticity measurement.
  • the operator after the operator is ready for the test, by observing the basic image of the target object (for example, B image), select the appropriate detection area, namely the section, and select the appropriate preload based on the pressure detection, and then start the multi Second elasticity measurement, each elasticity measurement obtains a measurement result, each measurement result is relatively independent, the operator needs to compare the data to select reliable and effective data; then, judge the validity of the measurement result and the number of measurement results Whether the statistical result meets the clinical requirements, if it is met, the measurement is ended, if not, the elasticity measurement is repeated until the clinical requirements are met.
  • each instantaneous elasticity measurement is mainly performed by the vibration mechanism of the probe for external vibration, such as motor vibration, which generates shear waves in the tissue, and the shear waves propagate in the target object, and the ultrasonic transducer on the probe emits Ultrasound, and receive ultrasonic echo to track and observe the propagation process of shear wave in the tissue and detect the displacement of the tissue, calculate the propagation speed Cs (m/s) of the shear wave, and display the corresponding image on the monitor, and further Estimate the elastic modulus E (kPa) of the tissue to reflect the degree of tissue fibrosis.
  • the transmission speed of shear wave in the tissue is positively related to the hardness of liver tissue. The greater the hardness of the tissue, the faster the propagation speed of the shear wave and the greater the elastic modulus.
  • the external vibration is equivalent to the signal source of the shear wave, and the external vibration comes from the motor movement under the driving signal.
  • the motor drives the vibration mechanism of the probe through a series of mechanical transmission structures to move further on the target object.
  • the surface vibrates.
  • the external vibration process can be simplified as a forced damped simple harmonic vibration process, and the relationship between the driving signal F(t) and the actual vibration x(t) can be expressed as:
  • b and ⁇ are the damping coefficient and the resonance coefficient respectively, which are related to the internal mechanical structure of the probe and the target object.
  • the traditional elasticity measurement is based on the assumption that b and ⁇ are basically the same within a certain preload range, and the actual vibration is also basically the same. Different target objects are fixed and the same drive signal is used, and the simple measurement is performed only before the probe vibrates. Preload judgment. In practical applications, although the section and preload are selected before the probe vibrates to avoid air vibration to a certain extent, it needs to rely on the control of the operator to affect the measurement efficiency in multiple elastic measurements; moreover, even before the vibration After selecting the cut surface and preloading, there will still be probe hollow vibration after the probe vibration starts. The hollow vibration of the probe detached from the body surface will cause certain damage to the internal mechanical structure and accelerate the aging of the probe.
  • FIG. 4 shows a schematic flowchart of an ultrasound imaging method according to an embodiment of the present invention.
  • the ultrasound imaging method 400 provided by the embodiment of the present invention includes:
  • Step S410 Excite the probe or vibrator to vibrate to generate a shear wave propagating in the target object to perform elasticity measurement, and transmit ultrasonic waves to the target object to detect the shear wave propagating in the target object;
  • Step S420 controlling the probe to receive the ultrasonic echo returned from the target object to obtain the ultrasonic echo signal
  • Step S430 detecting the pressure between the probe and the target object, or the actual value of the vibration parameter of the probe vibrating on the target object;
  • Step S440 processing the ultrasonic echo signal to obtain an ultrasonic image of the target object; wherein the processor further executes at least one of the following steps:
  • Step S441 judging the vibration state of the probe after the shear wave is generated
  • step S442 it is judged whether the pressure before and after the shear wave generated by the elasticity measurement is consistent;
  • step S443 the actual value of the vibration parameter of the control probe is kept constant.
  • step S430 can be performed before step S420, or it can be different from step S420.
  • S420 is performed at the same time, and can also be performed after step S420, which is not limited here.
  • the method before step S410, the method further includes: receiving an operation instruction from an operator to trigger the elasticity measurement.
  • the processor 105 of the ultrasound imaging device 10 receives an operation instruction.
  • the operation instruction may be a protocol (the protocol may be a corresponding workflow) trigger instruction of the operator after the ultrasound imaging device 10 is started, and the protocol trigger instruction may be a function displayed on the display interface (such as a touch screen).
  • the trigger command is not limited here.
  • stimulating the probe to generate shear waves in the target object for elasticity measurement may include:
  • the excitation probe generates external vibration on the target object, and the external vibration generates a shear wave that is transmitted to the target area in the target object.
  • the external vibration includes low frequency vibration.
  • the processor 105 After the processor 105 receives the trigger instruction from the operator, it sends a drive signal to the vibration mechanism 102, and the vibration mechanism 102 drives the vibrating device on the probe 100 to perform low-frequency pulsating mechanical movement on the target object, and then generates a low-frequency pulsating mechanical movement on the target object. Shear wave. The shear wave is transmitted from the surface of the target object into the target area in the deep tissue of the target object, causing the target area to produce elastic displacement.
  • the target area can be selected and determined by any applicable method, such as conventional two-dimensional B-mode imaging, conventional elastography E mode and other applicable basic imaging detection methods to determine after preliminary detection, or it can be selected according to the needs of elasticity measurement.
  • a shear wave is generated in the target object through external vibration at the surface position of the target object corresponding to the target area.
  • the target area can be the liver, or other tissues, and there is no limitation here.
  • the respective longitudinal depths or lateral positions of the multiple target regions may be different. It is understandable that when multiple target regions are measured at the same time, the average distance ratio between the multiple target regions can be obtained through subsequent steps, so as to reflect the difference in elasticity between the multiple target regions.
  • stimulating the probe to emit ultrasonic waves to the target object may include: stimulating the probe to emit ultrasonic waves to the target area of the target object to detect the propagation of shear waves in the target area.
  • the processor 105 in the ultrasound imaging device 10 controls the transmission/reception selection switch 108 to switch the probe to be connected to the transmission circuit 101, and controls the transmission circuit 101 to excite the transducer on the ultrasound probe 100 to the target of the object under test.
  • the area emits ultrasonic waves
  • ultrasonic tracking detects the propagation process of shear waves in the target area, and measures the propagation parameters of shear waves, such as shear wave velocity, shear wave modulus, shear wave attenuation, shear wave elasticity and Shear wave viscosity, etc.
  • the ultrasonic wave can be launched before the shear wave, or at the same time as the shear wave, and can also be launched at a preset time after the shear wave.
  • the preset time is when the shear wave enters the target object.
  • the time interval between back-distance ultrasonic generation, the preset time can be set according to needs, and there is no restriction here.
  • controlling the probe to receive the ultrasonic echo returned from the target object to obtain the ultrasonic echo signal may include:
  • the probe is switched to connect with the receiving circuit, and the receiving circuit receives the ultrasonic echo through the probe.
  • the processor 105 controls the transmitting/receiving selector switch 108 to switch the probe to be connected to the receiving circuit 103.
  • the ultrasonic wave returns from the surface of the target object to the target area, and the receiving circuit 103 passes through the transducer of the probe 100
  • the ultrasonic echo of the ultrasonic wave returned from the target area is received to obtain ultrasonic echo data.
  • the receiving circuit 103 sends the ultrasonic echo data to the processor 105 as measurement data.
  • detecting the pressure between the probe and the target object may include: detecting the pressure by a vibration state detection device.
  • the vibration state detection device 104 may be a pressure sensor, which collects the pressure between the probe 100 and the target object based on a predetermined frequency to obtain a pressure signal, and sends the pressure signal to the processor 105 for processing.
  • detecting the actual value of the vibration parameter of the probe vibrating on the target object may include: detecting the actual value of the vibration parameter by the vibration state detection device.
  • the vibration state detection device 104 may be a pressure sensor, and the actual value of the vibration parameter at this time corresponds to a pressure signal; and the vibration state detection device 104 may also be a displacement sensor, a speed sensor, or an acceleration sensor, respectively corresponding to the vibration parameters.
  • the actual value is displacement signal, velocity signal, acceleration signal.
  • the vibration state detection device 104 may include one of the above-mentioned various sensors to detect the actual value of a vibration parameter, or a combination thereof to detect the actual value of multiple vibration parameters, which is not limited herein.
  • the actual value of each vibration parameter may include at least one index of amplitude, frequency, and phase.
  • the pressure signal includes data such as the amplitude, frequency, and phase of the pressure.
  • the actual value of the vibration parameter may be waveform data.
  • the waveform data can reflect the amplitude, frequency, and phase.
  • processing the ultrasonic echo signal to obtain an ultrasonic image of the target object may include:
  • the ultrasonic echo signal is subjected to beam synthesis processing and then sent to the processor for processing to obtain an ultrasonic image.
  • the ultrasonic echo signal obtained by the receiving circuit 103 undergoes beam synthesis processing by the beam synthesis circuit 109, and then is sent to the processor 105; the processor 105 processes the ultrasonic echo signal, such as filtering, extracting useful data and converting it into a pre- Set the data format, etc. to obtain the ultrasound image and/or the elastic parameters of the target area.
  • the processor may send the ultrasonic echo signals of various stages to the memory for storage, such as the ultrasonic echo signals received by the processor, the processed ultrasonic echo signals, and so on.
  • the memory has a buffer function.
  • the processor is too late to process some ultrasonic echo signals, it can be temporarily stored in the memory.
  • the processor takes out the ultrasonic echo signals from the memory for processing, and sends the ultrasonic echo signals after processing. For storage. This can speed up the processing speed of the processor.
  • the processor is busy, the data is cached; when the processor is idle, the previously cached data is taken out for processing.
  • the data in the memory can be transmitted to the display in a preset period or in real time.
  • elastic parameter calculations can be performed on the ultrasonic echo signals collected multiple times at the same collection location.
  • determining the vibration state of the probe after the shear wave is generated may include:
  • the vibration state of the probe is judged based on the pressure.
  • the traditional method only performs pressure detection and basic image scanning before vibration.
  • Fig. 5 shows a schematic diagram of the pressure curve of the vibration process in an embodiment of the present invention.
  • the vibration process of generating shear waves by exciting the probe includes not only the pre-vibration link that is stabilized in the proper preload area, but also the vibration link of the vibration mechanism such as the motor working, and the vibration mechanism that stops working but continues to vibrate.
  • the after-vibration link (the vibration link and the after-vibration link are collectively referred to as the "in-vibration" link in this article) and the post-vibration link where the vibration is basically finished; among them, the upper limit of the no-load pressure range when the probe is vibrating is higher than that when the probe is vibrating normally The lower limit of the suitable pressure range is small.
  • the ultrasonic imaging method of the embodiment of the present invention continuously detects the pressure between the probe and the target object after the shear wave is generated, thereby judging the state of the probe vibration during the entire process of a single elasticity measurement based on the pressure, and preventing The probe stays in the no-load pressure range for a long time during and/or after vibration to avoid damage to the probe caused by the hollow vibration of the probe.
  • judging the vibration state of the probe based on the pressure after the shear wave is generated includes:
  • the first threshold ⁇ the second threshold ⁇ the third threshold, the first threshold, the second threshold, and the third threshold can all be set as needed, and there is no limitation here.
  • the vibration state detection device 104 continuously detects the pressure between the probe 100 (or vibrator) and the target object and sends the detected pressure data to the processor 105, namely During the vibration of the probe 100 (or vibrator), the vibration state detection device 104 also detects the pressure between the probe 100 (or vibrator) and the target object.
  • the processor 105 finds that the pressure is less than the first threshold, it further determines whether the pressure within a preset time range is always less than the first threshold. If the pressure is always less than the first threshold, the processor 105 determines that the probe 100 (or vibrator) is in idle vibration.
  • the processor 105 keeps receiving the pressure data of the vibration state detection device 104; when the processor 105 finds that the pressure is less than the second threshold or When it is greater than the third threshold, the processor 105 determines that the probe 100 (or vibrator) is in an abnormal working state.
  • the abnormal working state may refer to an abnormal working state that is neither a hollow vibration state, which may be caused by hand slippage or other reasons.
  • the processor 105 determines that the probe 100 (or vibrator) is in a normal working state.
  • the method further includes: prompting the user that the probe is in an abnormal working state when the probe is in an abnormal working state.
  • the probe when the probe is in an abnormal working state, the probe may slide or be caused by other factors. At this time, the probe is not completely separated from the target object, which may prompt the user that the probe is working abnormally and/or needs to be adjusted appropriately. Preload. Further, at this time, the probe can also be controlled to stop vibrating, and/or not output the measurement result of the elasticity measurement, and/or not start the next measurement, and/or exit the current measurement.
  • the method further includes at least one of the following: prompting the user that the probe is in the empty vibration state, controlling the probe to stop vibrating, or not outputting the measurement result of the elasticity measurement. Further, at this time, the next measurement may not be started, and/or the current measurement may be exited.
  • the user when it is determined that the probe is in the idle state after the shear wave is detected, the user may only be prompted that the probe is idle and/or needs to select a suitable preload, and no other actions are performed at this time. , The user can decide whether to continue the test according to the actual situation; it can also stop the vibration of the probe to protect the probe while reminding the user that the probe is empty The second test result has a greater impact and makes the test result inaccurate. You can exit the current test without outputting the measurement result of the current elasticity measurement.
  • the method further includes: when the user separates the probe from the target object, controlling the probe to stop vibrating.
  • the operator can use the ultrasonic imaging method of the embodiment of the present invention to facilitate the actual operation.
  • the probe can be actively operated to separate the probe from the surface of the target object.
  • the probe stops vibrating, and the operator can quickly and conveniently stop the detection based on this function, which is convenient and easy to operate, which greatly improves the operator’s experience .
  • the probe may remain in a vibrating state until the processor does not receive an instruction from the operator to stop the vibration. At this time, not only will the probe be damaged due to the hollow vibration of the probe itself, but also It is also because there is no effective detection at this time, which causes a waste of resources.
  • Fig. 6 shows a schematic diagram of pressure curves before and after shear vibration according to an embodiment of the present invention. As shown in Figure 6, a small difference in pressure before and after vibration indicates that the shear wave is closer to the expectation, and a larger pressure difference before and after vibration indicates that the shear wave is inconsistent with the expectation.
  • the ultrasonic imaging method of the embodiment of the present invention detects shear waves. Whether the pressure before and after the generation is consistent, to determine whether the probe is sliding and/or whether the current detection result is valid. If the pressure before and after the shear wave is not consistent, the user can be prompted to determine whether to continue the detection.
  • step S442 determining whether the pressure before and after the shear wave of the elasticity measurement is consistent includes:
  • the processor 105 receives the pressure data collected by the vibration state detection device 104, and the vibration state detection device 104 may be based on the first frequency or the first time interval at least once in the first time period before the operator triggers the elasticity measurement. Collect the pressure between the probe 100 and the target object before the operator triggers the elasticity measurement as the first set of pressure data, and send the first set of pressure data to the processor 105, and the processor 105 calculates the average of the first set of pressure data The value is used as the first pressure.
  • the processor 105 acquires the pressure only once before the probe 100 vibrates, the pressure is taken as the first pressure; the processor 105 receives the operating instruction from the operator and triggers the vibration mechanism 102 to excite the probe 100 After the shear wave is generated by the vibration on the target object, the vibration state detection device 104 can collect the pressure between the probe 100 and the target object at least once in the second time period based on the preset second frequency or the second time interval as the second time period. Set the pressure data and send the second set of pressure data to the processor 105. The processor 105 calculates the average value of the second set of pressure data as the second pressure.
  • the processor 105 obtains the pressure only once after the probe 100 vibrates ,
  • the pressure is regarded as the second pressure;
  • the processor 105 can also calculate the difference between the first pressure and the second pressure based on the third frequency or the third time interval or the preset time, and determine whether the difference is within the set range If the difference is within the set range, it is determined that the pressure before and after the shear wave is consistent. The validity of the current measurement result is high. If the difference is not within the set range, it is determined that the pressure before and after the shear wave is inconsistent. The validity of this measurement result is low, the probe may slip during the measurement process, or the pressure between the probe 100 and the target object before and after the shear wave is generated (that is, before and after the vibration) is inconsistent due to other reasons.
  • obtaining the pressure before the generation of the shear wave and obtaining the pressure after the generation of the shear wave may include collecting one or more pressures to obtain the first pressure and the second pressure.
  • obtaining the pressure before the shear wave is generated may include: collecting the pressure at least once in the first time period before the shear wave is generated.
  • obtaining the pressure after the shear wave is generated may include: collecting the pressure at least once in the second time period after the shear wave is generated.
  • first frequency, the second frequency and the third frequency, the first time interval, the second time interval, and the third time interval, the preset time point, and the setting range can be set as needed, and there is no limitation here. .
  • step S442 can be used in combination with step S441, which specifically includes:
  • step S442 it is determined that the pressures before and after the current detected shear wave are inconsistent.
  • the user can actively separate the probe 100 from the target object, and the processor 105 sends corresponding instructions to the vibration mechanism 102.
  • the vibrating mechanism 102 controls the probe 100 to stop vibrating according to the instruction, and ends this detection.
  • the method further includes: judging the validity of the measurement result of the elasticity measurement and/or whether the probe is sliding.
  • determining the validity of the measurement result of the elasticity measurement and/or whether the probe is sliding includes:
  • the probe when the pressure before and after the shear wave generated by the elasticity measurement is inconsistent, the probe may slip and/or the measurement result may be invalid. There may be slippage and/or the measurement result of the current test is less reliable. Further, at this time, the probe can also be controlled to stop vibrating, and/or not output the measurement result of the elasticity measurement, and/or not start the next measurement, and/or exit the current measurement.
  • the method further includes: obtaining valid measurement results of multiple elasticity measurements, and using a median of the valid measurement results as the elasticity measurement result of the target object.
  • the pressure of the probe and the target object is detected for the entire vibration process of each elasticity measurement to determine whether the pressure before and after the shear wave of each elasticity measurement is consistent; Or the pressures before and after the shear waves of certain elastic measurements are inconsistent, then in these elastic measurements with inconsistent pressures before and after vibration, the user is prompted that the pressures are inconsistent before and after vibration, but the median of the measurement results of all n elastic measurements can still be calculated. The number is used as the elasticity measurement result of the target object.
  • the operator can also determine the measurement results involved in the calculation of the n elasticity measurement results. For example, the operator can determine whether the result is valid based on the inconsistent pressure before and after vibration and whether it can participate in the elasticity measurement of the target object.
  • the traditional elasticity measurement method adopts open-loop control.
  • the vibration mechanism excites the probe under a fixed driving signal.
  • the influence of external factors may make the actual vibration often fail to reach the expected target vibration. It is also impossible to effectively control the vibration process.
  • different target objects use the same driving signal to vibrate, and the shear waves generated are different; even the same target object may have different vibrations for each elastic measurement, resulting in different shear waves. Waves may also be different, which will have a certain impact on the accuracy of elasticity measurement.
  • the ultrasonic imaging method performs feedback adjustment on the driving signal of the vibration mechanism according to the actual vibration of the probe or the vibrator, and actively controls the vibration signal in the actual vibration process as the feedback input to calculate the corresponding adjustment value.
  • the adjustment quantity is used to dynamically control the drive signal of the vibration mechanism to form a closed-loop control, regardless of whether the target object or objective factors change, and finally make the actual vibration waveform consistent with the expected target to generate a stable and expected shear wave.
  • the vibration of the probe or the vibrator can reach a normal level, and the lack of hardware performance of the probe or the vibrator can be compensated from the perspective of control.
  • controlling the actual value of the vibration parameter of the probe or the vibrator to remain constant may include:
  • the adjusted working parameter of the probe or the vibrator may be a driving signal used to control the vibration mechanism to drive the probe or the vibrator to vibrate.
  • the vibration mechanism 102 receives the driving signal to excite the probe 100 to start vibrating, and the vibration state detection device 104 collects the actual value of the vibration parameter of the probe 100, according to the actual value of the vibration parameter.
  • the adjusted working parameter of the probe or vibrator may also be the resonance coefficient and/or damping coefficient of the probe or vibrator.
  • the processor 105 can also adjust the damping coefficient b and/or the resonance coefficient ⁇ of the probe or the vibrator by changing the parameters of the transmission mechanism shown in FIG. 7 such as the size, so that the actual vibration remains stable and meets expectations.
  • the vibration of the probe 100 on the target object is a forced damping resonance process, but different target objects or different probes will actually change the damping coefficient b and the resonance coefficient ⁇ .
  • the actual vibration control can also be achieved by adjusting the damping coefficient b and the resonance coefficient ⁇ of the probe or vibrator.
  • calculating the driving signal adjustment amount of the vibration mechanism 104 according to the actual value of the vibration parameter may include:
  • the aforementioned drive signal adjustment amount is calculated based on the vibration adjustment amount.
  • the target value of the vibration parameter may refer to the value expected to be achieved in the actual work of the vibration parameter, and this target value may be preset.
  • FIG. 7 shows a schematic diagram of the control principle of the ultrasonic imaging method according to an embodiment of the present invention.
  • the motor ie, the vibration mechanism
  • the vibration state detection device 104 collects the actual value of the vibration parameter of the vibration device, and the processor 105
  • the active control module receives the actual value of the vibration parameter of the probe 100 collected by the vibration state detection device 104, and calculates the difference between the actual value of the vibration parameter and the target value of the vibration parameter to obtain the vibration adjustment amount, thus according to the aforementioned formula (1) damping simplified
  • the harmonic motion equation is calculated to obtain the drive signal adjustment amount of the drive signal, and the drive signal adjustment amount is used to adjust the drive signal to obtain an updated drive signal. Then, the updated drive signal is used as the input of the vibration mechanism 102 to realize the actual vibration parameters. Value for the adjustment of the vibration mechanism 102.
  • calculating the adjustment amount of the vibration mechanism based on the actual value of the vibration parameter and the target value of the vibration parameter may include:
  • the adjustment amount is calculated based on the vibration adjustment amount and the damped harmonic vibration equation.
  • the ultrasound imaging method according to the embodiment of the present invention can be used to meet different clinical needs. If the clinical requirement for timeliness is high, the dynamic control method of real-time adjustment can be used to adjust the next moment of the current vibration while the probe is vibrating, and control the actual vibration state in real time to maintain the target vibration state stably, which is suitable for the needs Quick response occasions; if the clinical requirement for timeliness is low, the dynamic control method of non-real-time adjustment can be used. After the current vibration is over, the adjustment amount is calculated based on the actual value of the current vibration parameter, and the next vibration is adjusted. This method has low cost, reduces the requirements for hardware, and is suitable for occasions where hardware requirements are not high.
  • the adjustment amount is used to adjust the waveform or amplitude of the actual value of the vibration parameter.
  • the adjustment value is used to adjust the waveform of the actual value of the vibration parameter, it is actually to adjust multiple indicators such as the amplitude, flat rate and phase of the vibration signal at the same time.
  • This comprehensive adjustment method is complicated, but it controls the vibration.
  • the effect of stabilization is good; alternatively, since the vibration signal is most affected by the amplitude, it is more sensitive to the adjustment of the amplitude, and only the amplitude of the vibration signal can be adjusted in the occasions where the complexity is not high.
  • a suitable combination of timeliness and completeness can be selected according to actual needs and limitations of software and hardware platforms. For example, in routine inspections, multiple independent elastic measurements are usually performed, and the final results are obtained by statistics of the multiple elastic measurement results. In this case, low-cost non-real-time amplitude adjustment can meet the requirements; while for a single elastic measurement, the requirements are higher.
  • the real-time or waveform adjustment scheme can be used to ensure the stability of the actual vibration.
  • adjusting the drive signal according to the actual value of the vibration parameter includes:
  • the drive signal is supplemented according to the drive signal adjustment amount to obtain an updated drive signal.
  • the vibration state detection device 104 can collect the actual value of the vibration parameter of the probe 100 in real time based on a certain frequency or time interval, and send the actual value of the vibration parameter to the active control module.
  • the control module calculates the drive signal adjustment amount in real time, it uses the drive signal adjustment amount to supplement the drive signal to obtain an updated drive signal, and then outputs the updated drive signal to the vibration mechanism 102, which drives the vibration mechanism 102 to drive the probe or vibrator to vibrate , In order to realize the real-time dynamic adjustment of the actual vibration.
  • adjusting the shear wave drive signal according to the actual value of the vibration parameter includes:
  • the updated driving signal is used to drive the vibration mechanism 102 to drive the probe or vibrator to vibrate.
  • the vibration state detection device 104 may collect the actual value of the vibration parameter of the detection probe 100 based on a certain frequency or time interval, and send the actual value of the vibration parameter collected in the current vibration process
  • the active control module calculates the driving signal adjustment amount based on the actual value of at least part of the vibration parameter, for example, calculates the average signal of the actual value of the vibration parameter based on the actual value of at least some
  • the difference between the target values of the parameters obtains the vibration adjustment amount, and the driving signal adjustment amount is obtained based on the vibration adjustment amount and the damping resonance equation, and the driving signal is adjusted according to the driving signal adjustment amount to obtain the updated driving signal; when the probe 100 starts the next vibration , Output the updated driving signal to the vibration mechanism 102 to drive the vibration mechanism 102 to drive the probe or vibrator to vibrate, so as to adjust the actual vibration.
  • the method further includes: increasing or decreasing the driving signal adjustment amount based on the user's operation instruction to correspondingly control the actual value of the vibration parameter.
  • the operator can also optimize the operation based on the function of step S431 to facilitate the operation.
  • Each target object has different perception and acceptance of the probe 100 and the same degree of vibration.
  • it is necessary to reduce the probe 100 and the elasticity test on the premise that the elasticity test can be completed.
  • the pressure between the target objects to increase the comfort and cooperation of the target objects.
  • the operator can issue an instruction to reduce the vibration pressure through the corresponding button or the operation interface.
  • the active processing module in the processor 105 obtains the instruction, and then Reduce the drive signal adjustment amount based on a predetermined amplitude, and use the reduced drive signal adjustment amount to adjust the drive signal to obtain the aforementioned updated drive signal, and input the updated drive signal into the vibration mechanism to reduce the vibration level of the probe 100 and The pressure between the target object and the probe improves the comfort of detecting the target object.
  • the operator can issue an instruction to decrease or increase the vibration pressure through the corresponding button or operation interface .
  • the active processing module in the processor 105 obtains the instruction, and then increases the drive signal adjustment amount based on a predetermined amplitude, and uses the increased drive signal adjustment amount to adjust the drive signal to obtain the aforementioned updated drive signal, and update
  • the driving signal is input to the vibration mechanism to increase the vibration degree of the probe 100 and the pressure between the target object and the probe, so as to facilitate the smooth completion of the elasticity measurement.
  • the vibrator or the probe may be driven to vibrate to generate a shear wave propagating in the target object, and then the probe may be excited to emit ultrasonic waves to the target object to detect the shear wave propagating in the target object. Subsequently, the ultrasonic echo returned from the target object is received by the probe to obtain the ultrasonic echo signal, and the ultrasonic echo signal is processed, for example, processed by the aforementioned processor to obtain the propagation parameter of the shear wave.
  • the pressure between the vibrator or the probe and the target object can be detected to obtain the vibrating pressure, and according to the vibrating The pressure determines the vibration state of the vibrator or probe.
  • the determination of the in-vibration pressure can be compared with a preset threshold to determine the vibration state of the vibrator or the probe. For example, when the vibrating pressure is always less than the first threshold within the preset time range, it is determined that the vibrator or probe is in the idling state; and/or, when the vibrating pressure is less than the second threshold or greater than the third threshold , It is determined that the vibrator or probe is in an abnormal working state; and/or, when the vibrating pressure is greater than or equal to the second threshold and less than or equal to the third threshold, it is determined that the vibrator or probe is in a normal working state; and so on.
  • the user may be prompted that the vibrator or probe is in an abnormal working state.
  • At least one of the following steps may be performed: prompt the user that the vibrator or probe is in the idle state; control the vibrator or probe to stop vibrating; do not output the current vibration ultrasound The propagation parameter of the shear wave obtained by the imaging device; and, prompting the user that the propagation parameter of the shear wave obtained during the current vibration is abnormal.
  • the vibrator or the probe may be driven to vibrate to generate a shear wave propagating in the target object, and then the probe may be excited to emit ultrasonic waves to the target object to detect the shear wave propagating in the target object. Subsequently, the ultrasonic echo returned from the target object is received by the probe to obtain the ultrasonic echo signal, and the ultrasonic echo signal is processed, for example, processed by the aforementioned processor to obtain the propagation parameter of the shear wave.
  • the vibration state of the vibrator or the probe can be detected to obtain vibration state data, and when the vibration state data indicates that the vibration state of the vibrator or probe is abnormal, perform at least one of the following Steps: prompt the vibrator or the probe to be in an abnormal state; control the vibrator or the probe to stop vibrating; do not output the shear wave propagation parameters obtained by the ultrasonic imaging device during the current vibration; prompt the current vibration The propagation parameter of the shear wave obtained by the ultrasonic imaging device is abnormal; and, stopping the acquisition of the propagation parameter of the shear wave by the ultrasonic imaging device.
  • the in-vibration state data indicates that the vibration state of the vibrator or the probe is abnormal
  • at least one of the following steps is performed: prompt the vibrator or the probe to be in an abnormal state; when the current vibration is not output, the ultrasound imaging device obtains Propagation parameters of shear waves; Prompt that the propagation parameters of shear waves obtained by the ultrasonic imaging device are abnormal when the ultrasonic imaging device is currently vibrating; and Stop obtaining the propagation parameters of shear waves by the ultrasonic imaging device.
  • the diagnostic state of the vibrator or probe can be continuously detected to obtain vibration state data, and when the vibration state data indicates that the vibration state of the vibrator or probe returns to normal, at least one of the following steps is performed: prompt the vibrator or the The probe returns to a normal state; restores the output of the shear wave propagation parameters obtained by the ultrasonic imaging device during the current vibration; prompts that the shear wave propagation parameters obtained by the ultrasonic imaging device during the current vibration return to normal; and, resumes passing through the The ultrasonic imaging equipment obtains the propagation parameters of the shear wave.
  • the vibration state data may be contact state detection data obtained by a contact detection device, and when the contact state detection data obtained by the contact detection device indicates that the vibrator or probe is out of contact with the target object, it is determined The vibration state of the vibrator or probe is abnormal.
  • the contact detection device may be at least one of a temperature sensor, a distance sensor, a pressure sensor, a resistance sensor, a capacitance sensor, and a magnetic field sensor.
  • the vibration state data may be the vibration pressure between the vibrator or probe and the target object obtained by a pressure sensor, and when the vibration pressure is always less than the first threshold within the preset time range , It is determined that the vibration state of the vibrator or probe is abnormal; and/or, when the in-vibration pressure is less than the second threshold or greater than the third threshold, it is determined that the vibration state of the vibrator or the probe is abnormal. In addition, when the in-vibration pressure is greater than or equal to the second threshold and less than or equal to the third threshold, it is determined that the vibration state of the vibrator or the probe returns to normal.
  • the vibrator or the probe may be driven to vibrate to generate a shear wave propagating in the target object, and then the probe may be excited to emit ultrasonic waves to the target object to detect the shear wave propagating in the target object. Subsequently, the ultrasonic echo returned from the target object is received by the probe to obtain the ultrasonic echo signal, and the ultrasonic echo signal is processed, for example, processed by the aforementioned processor to obtain the propagation parameter of the shear wave.
  • it can also detect the pressure between the vibrator or the probe and the target object before the vibrator or the probe vibrates, and detect the pressure between the vibrator or the probe and the target object after the vibrator or the probe vibrates, and according to the vibrator or probe vibration
  • the pressure between the vibrator or the probe and the target object before and after the vibration determines whether the pressure between the vibrator or the probe and the target object is consistent before and after the vibrator or the probe vibrates.
  • the average value of the pressure between the vibrator or probe and the target object before the vibrator or probe vibrates can be obtained as the first pressure, and the pressure between the vibrator or probe and the target object after the vibrator or probe vibrates can be obtained.
  • the average value of the pressure is used as the second pressure, and it is determined whether the difference between the first pressure and the second pressure is within the set range. When the difference is within the set range, it is determined that the pressure between the vibrator or probe and the target object before and after the vibrator or probe vibrates is consistent; when the difference is not within the set range, the vibrator or probe is determined The pressure between the vibrator or probe and the target object is inconsistent before and after the vibration.
  • At least one of the following steps may be performed: prompt the vibrator or probe to be in an abnormal state; control the vibrator or probe The probe stops vibrating; does not output the propagation parameters of the shear wave obtained during the current vibration; prompts that the propagation parameters of the shear wave obtained during the current vibration are abnormal; and, stops obtaining the propagation parameters of the shear wave.
  • the vibrator or the probe may be driven to vibrate to generate a shear wave propagating in the target object, and then the probe may be excited to emit ultrasonic waves to the target object to detect the shear wave propagating in the target object. Subsequently, the ultrasonic echo returned from the target object is received by the probe to obtain the ultrasonic echo signal, and the ultrasonic echo signal is processed, for example, processed by the aforementioned processor to obtain the propagation parameter of the shear wave.
  • the actual value of the vibration parameter of the vibrator or probe can be detected, and the working parameters of the vibrator or probe can be adjusted according to the detected actual value of the vibration parameter of the vibrator or probe and the target value of the vibration parameter to change the The actual value of the vibration parameter of the vibrator or the probe makes the actual value of the vibration parameter consistent with or tend to be consistent with the target value of the vibration parameter.
  • the drive signal used to drive the vibrator or probe to vibrate can be adjusted according to the actual value of the vibration parameter and the target value of the vibration parameter to obtain an updated drive signal, and the updated drive signal is used to drive the vibrator or probe to vibrate, Therefore, the actual value of the vibration parameter of the vibrator or the probe is changed so that the actual value of the vibration parameter is consistent with or tends to be consistent with the target value of the vibration parameter.
  • the drive signal adjustment amount can be calculated based on the actual value of the vibration parameter and the target value of the vibration parameter, and the drive signal adjustment amount is used to adjust the aforementioned drive signal to obtain the updated drive signal.
  • the difference between the actual value of the vibration parameter and the target value of the vibration parameter can be calculated to obtain the vibration adjustment amount, and the aforementioned drive signal adjustment amount can be calculated according to the vibration adjustment amount.
  • the resonance coefficient and/or damping coefficient of the vibrator or probe can be adjusted according to the actual value of the vibration parameter and the target value of the vibration parameter, so as to change the actual value of the vibration parameter of the vibrator or probe so that the The actual value of the vibration parameter is consistent with or tends to be consistent with the target value of the vibration parameter.
  • the target value of the aforementioned vibration parameter can also be directly adjusted.
  • the target value of the vibration parameter can be adjusted based on the user's input instruction. For example, when the user wants to increase or decrease the pressure between the probe or the vibrator and the target object, an instruction to increase or decrease the pressure can be input through the corresponding key or operation interface. After receiving the instruction, the processor 105 can correspondingly increase or decrease the target value of the vibration parameter (here, the target pressure).
  • the processor 105 calculates the drive signal adjustment amount according to the actual value of the current vibration parameter and the target value of the adjusted vibration parameter, and uses the drive signal adjustment amount to adjust the drive signal to obtain an update drive signal, and then use the update drive
  • the signal drives the vibration mechanism 102 to drive the probe or vibrator to vibrate, thereby achieving the purpose of increasing or reducing the pressure between the probe or the vibrator and the target object.
  • the target value of the vibration parameter can also be automatically adjusted by the ultrasound imaging system (for example, by its processor). For example, when the ultrasonic imaging system detects that the actual value of the current vibration parameter is inappropriate (for example, the pressure between the probe or vibrator and the target object is too large or too small, etc.), it can directly and automatically generate a corresponding increase or decrease. Small corresponding instruction of the target value of the vibration parameter. After receiving the instruction, the processor 105 can correspondingly increase or decrease the target value of the vibration parameter (for example, in this example, the target pressure between the probe or the vibrator and the target object).
  • the target value of the vibration parameter for example, in this example, the target pressure between the probe or the vibrator and the target object.
  • the processor 105 calculates the drive signal adjustment amount according to the actual value of the current vibration parameter and the target value of the adjusted vibration parameter, and uses the drive signal adjustment amount to adjust the drive signal to obtain an update drive signal, and then use the update drive
  • the signal drives the vibration mechanism 102 to drive the probe or vibrator to vibrate, thereby achieving the purpose of increasing or reducing the pressure between the probe or the vibrator and the target object.
  • the ultrasonic imaging system can detect the actual value of the current vibration parameter (for example, the pressure between the probe or the vibrator and the target object, etc.) through a vibration parameter detection device (for example, a pressure sensor, etc.), and The actual value of the detected vibration parameter is compared with a preset threshold or threshold range. When the actual value of the detected vibration parameter is greater than or less than the preset threshold, or is not within the set threshold, or meets some other set conditions, it is determined that the actual value of the current vibration parameter is inappropriate , Thereby automatically generating an instruction to increase or decrease the target value of the corresponding vibration parameter (for example, the target pressure between the probe or the vibrator and the target object).
  • a vibration parameter detection device for example, a pressure sensor, etc.
  • the ultrasonic imaging system may also process and analyze the ultrasonic echo signal received by the ultrasonic probe or the shear wave propagation parameter obtained from the ultrasonic echo signal to determine whether the actual value of the current vibration parameter is appropriate. And when it is determined that the actual value of the current vibration parameter is not appropriate, an instruction to increase or decrease the target value of the corresponding vibration parameter (for example, the target pressure between the probe or the vibrator and the target object) is automatically generated accordingly.
  • the target value of the corresponding vibration parameter for example, the target pressure between the probe or the vibrator and the target object
  • the processor may adjust the target value of the vibration parameter according to at least one of the received input instruction, the actual value of the vibration parameter, the ultrasonic echo signal and the propagation parameter of the shear wave.
  • the processor when adjusting the target value of the vibration parameter, may directly adjust the target value of the desired vibration parameter to the desired value, or may adjust the target value of the desired vibration parameter in a certain step. Value (in this case, it can be considered that each step is the value of the target value of a new vibration parameter).
  • the ultrasonic imaging equipment and method of the embodiments of the present invention detect the pressure of the probe between the target objects after the probe starts to vibrate to determine whether the probe has air vibration or sliding, and whether the measurement result is valid, and prevent the probe air vibration from affecting the service life of the probe , Improve the effectiveness of the elasticity measurement results; and adjust the channel signal of the probe according to the vibration signal to ensure the stability of the actual vibration of the probe, and further improve the accuracy of the elasticity detection.

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Abstract

L'invention concerne un appareil d'imagerie ultrasonore (10) et un procédé associé. Un mécanisme de vibration (102) excite une sonde (100) pour qu'elle génère des ondes de cisaillement dans un objet cible afin d'effectuer une mesure d'élasticité ; un circuit de transmission (101) excite la sonde (100) pour transmettre des ondes ultrasonores à l'objet cible, et reçoit et traite des échos ultrasonores de façon à acquérir une image ultrasonore de l'objet cible ; et l'état de vibration de la sonde (100) est déterminé après la génération des ondes de cisaillement, si la pression avant et après la génération des ondes de cisaillement pour la mesure d'élasticité est cohérente, et la valeur réelle d'un paramètre de vibration de la sonde (100) est régulée de façon à être maintenue constante. Au moyen de l'appareil d'imagerie ultrasonore (10) et du procédé, la pression de la sonde (100) entre des objets cibles après que la sonde (100) commence à vibrer est détectée de façon à déterminer si une vibration vide ou un glissement se produit sur la sonde (100) et si un résultat de mesure est valide, ce qui permet d'empêcher la vibration vide de la sonde (100) d'influencer la durée de vie de la sonde (100), et améliore la validité du résultat de mesure d'élasticité ; et en fonction d'un signal de vibration, un signal de canal de la sonde (100) est ajusté de façon à assurer la stabilité de vibration réelle de la sonde (100), ce qui permet d'améliorer davantage la précision de détection d'élasticité.
PCT/CN2020/090341 2020-05-14 2020-05-14 Appareil et procédé d'imagerie ultrasonore WO2021226958A1 (fr)

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