CN111214256B - Ultrasonic imaging method, ultrasonic imaging apparatus, electronic device, and storage medium - Google Patents
Ultrasonic imaging method, ultrasonic imaging apparatus, electronic device, and storage medium Download PDFInfo
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Abstract
The invention discloses an ultrasonic imaging method, an ultrasonic imaging device, electronic equipment and a storage medium. The method is applied to an ultrasonic imaging device, wherein the ultrasonic imaging device comprises an ultrasonic probe, and the ultrasonic probe comprises a piezoelectric wafer; the ultrasonic imaging method comprises the following steps: selecting a target window function according to the amplitude-frequency characteristic of the ultrasonic probe; and performing amplitude modulation on the initial excitation signal by using the target window function to obtain a target excitation signal, so that after the ultrasonic probe transmits ultrasonic waves, the ratio of the energy of the first frequency component to the energy of the second frequency component of the echo signal received by the ultrasonic probe reaches a preset ratio range, wherein the ultrasonic waves are generated by exciting the piezoelectric wafer by using the target excitation signal. The ultrasonic image desired by the medical staff can be reconstructed.
Description
Technical Field
The present invention relates to the field of medical imaging technologies, and in particular, to an ultrasonic imaging method and apparatus, an electronic device, and a storage medium.
Background
When ultrasonic imaging is carried out, an ultrasonic probe of ultrasonic equipment transmits an ultrasonic excitation signal to human tissues, and the ultrasonic probe also acquires echo signals reflected by the human body, wherein the echo signals reflect the reflection attenuation characteristics of different tissues and organs in the human body to sound waves, so that an image in the tissues is reconstructed.
In order to meet the requirements of medical personnel on disease diagnosis, echo signals are required to have different ratios of low-frequency components to high-frequency components according to different scanning parts. The ratio is related to the excitation signal on the one hand and is also influenced by the frequency response of the ultrasonic probe on the other hand. If the frequency response of the ultrasonic probe is relatively flat in the signal frequency range required by imaging, the detection depth and the image resolution can be ensured. If the frequency response of the ultrasonic probe is not ideal, for example, when the attenuation of the high-frequency part is serious, the high-frequency component of the obtained echo signal is too low, which may result in the deterioration of the image resolution; when the attenuation of the low frequency part is serious, the detection depth is influenced.
Disclosure of Invention
The invention provides an ultrasonic imaging method, an ultrasonic imaging device, electronic equipment and a storage medium, which can ensure the detection depth and the imaging resolution in the ultrasonic imaging process.
Specifically, the invention is realized by the following technical scheme:
in a first aspect, an ultrasonic imaging method is provided, which is applied to an ultrasonic imaging apparatus, where the ultrasonic imaging apparatus includes an ultrasonic probe, and the ultrasonic probe includes a piezoelectric wafer;
the ultrasonic imaging method comprises the following steps:
selecting a target window function according to the amplitude-frequency characteristic of the ultrasonic probe;
and performing amplitude modulation on the initial excitation signal by using the target window function to obtain a target excitation signal, so that after the ultrasonic probe transmits ultrasonic waves, the ratio of the energy of the first frequency component to the energy of the second frequency component of the echo signal received by the ultrasonic probe reaches a preset ratio range, wherein the ultrasonic waves are generated by exciting the piezoelectric wafer by using the target excitation signal.
Optionally, amplitude modulating the initial excitation signal using the target window function includes:
performing product operation on the target window function and the initial excitation signal to obtain a product operation result signal;
and increasing the pulse number of the product operation result signal so that the energy difference between the product operation result signal after the pulse number is increased and the initial excitation signal is smaller than a preset energy range.
Optionally, after performing amplitude modulation on the initial excitation signal by using the target window function, the method further includes:
and performing pulse width modulation on the pulse signal according to the amplitude-modulated excitation signal, and taking the pulse width-modulated signal as a target excitation signal.
Optionally, the pulse signal is pulse-width modulated according to the amplitude modulated excitation signal, including:
performing integral operation on the excitation signal subjected to amplitude modulation;
determining a target pulse width according to the integral operation result and the amplitude of the pulse signal;
and adjusting the pulse width of the pulse signal according to the target pulse width, and taking the pulse signal subjected to pulse width adjustment as a target excitation signal.
Optionally, selecting the target window function according to the amplitude-frequency characteristics of the ultrasound probe comprises:
respectively carrying out amplitude modulation on the initial excitation signals by using a plurality of window functions;
performing convolution operation on each excitation signal subjected to amplitude modulation and the amplitude-frequency characteristic for two times;
and determining a window function corresponding to a target convolution operation result signal as a target window function, wherein the target convolution operation result signal is a signal of which the ratio of the energy of the first frequency component to the energy of the second frequency component in the signal after two times of convolution operation reaches the preset ratio range.
In a second aspect, an ultrasonic imaging apparatus is provided, which is applied to an ultrasonic imaging device, the ultrasonic imaging device includes an ultrasonic probe;
the ultrasonic imaging apparatus includes:
the selection module is used for selecting a target window function according to the amplitude-frequency characteristic of the ultrasonic probe;
and the amplitude modulation module is used for carrying out amplitude modulation on the initial excitation signal by using the target window function to obtain a target excitation signal, so that after the ultrasonic probe transmits ultrasonic waves, the ratio of the energy of the first frequency component to the energy of the second frequency component of the echo signal received by the ultrasonic probe reaches a preset ratio range, wherein the ultrasonic waves are generated by exciting the piezoelectric wafer by using the target excitation signal.
Optionally, when the target window function is used to perform amplitude modulation on the initial excitation signal, the amplitude modulation module is specifically configured to:
performing product operation on the target window function and the initial excitation signal to obtain a product operation result signal;
and increasing the pulse number of the product operation result signal so that the energy difference between the product operation result signal after the pulse number is increased and the initial excitation signal is smaller than a preset energy range.
Optionally, the ultrasound imaging apparatus further comprises:
and the pulse width modulation module is used for carrying out pulse width modulation on the pulse signal according to the excitation signal subjected to amplitude modulation, and taking the signal subjected to pulse width modulation as the target excitation signal.
Optionally, when the pulse signal is pulse-width modulated according to the amplitude-modulated excitation signal, the pulse-width modulation module is specifically configured to:
performing integral operation on the excitation signal subjected to amplitude modulation;
determining a target pulse width according to the integral operation result and the amplitude of the pulse signal;
and adjusting the pulse width of the pulse signal according to the target pulse width, and taking the pulse signal subjected to pulse width adjustment as a target excitation signal.
Optionally, the selection module is specifically configured to:
respectively carrying out amplitude modulation on the initial excitation signals by using a plurality of window functions;
performing convolution operation twice on each excitation signal subjected to amplitude modulation and the amplitude-frequency characteristic;
and determining a window function corresponding to the target convolution operation result signal as a target window function, wherein the target convolution operation result signal is a signal of which the ratio of the energy of the first frequency component to the energy of the second frequency component in the signal after two times of convolution operation reaches the preset ratio range.
In a third aspect, an electronic device is provided, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the processor implements the ultrasound imaging method according to any one of the first aspect.
In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the ultrasound imaging method of any one of the first aspects.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
in the embodiment of the invention, before ultrasonic scanning, a window function is used for amplitude modulation on the initial excitation signal, so that the ratio of the energy of the low-frequency component and the energy of the high-frequency component of the echo signal received by the ultrasonic probe meets the requirement of medical diagnosis of medical staff, and an ultrasonic image required by the medical staff is reconstructed.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flow chart illustrating a method of ultrasound imaging in accordance with an exemplary embodiment of the present invention;
FIG. 2 is a flowchart illustrating step 101 of FIG. 1 in accordance with an exemplary embodiment of the present invention;
FIG. 3a is a graph of a Gaussian window shown in an exemplary embodiment of the invention;
FIG. 3b is a graph of an excitation signal shown in an exemplary embodiment of the invention;
FIG. 3c is a graph of the result of amplitude modulating the excitation signal shown in FIG. 3b using the Gaussian window shown in FIG. 3 a;
FIG. 3d is a graph illustrating the result of superimposing the amplitude-frequency characteristic of the ultrasound probe twice on the graph illustrated in FIG. 3b and the graph illustrated in FIG. 3c, in accordance with an exemplary embodiment of the present invention;
FIG. 4 is a flow chart illustrating another method of ultrasound imaging in accordance with an exemplary embodiment of the present invention;
FIG. 5 is a flowchart illustrating step 403 of FIG. 4 in accordance with an exemplary embodiment of the present invention;
FIG. 6 is a block diagram of an ultrasound imaging device shown in an exemplary embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an exemplary embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at" \8230; "or" when 8230; \8230; "or" in response to a determination ", depending on the context.
The medical ultrasonic imaging technology obtains ultrasonic images by utilizing different reflection attenuation characteristics of different tissues and organs in a human body to ultrasonic waves. The ultrasonic imaging apparatus includes an excitation power source, a transmission chip, an imaging device, and an ultrasonic probe (ultrasonic transducer). The ultrasonic probe consists of a piezoelectric wafer, the piezoelectric wafer is excited by an excitation signal (electric signal) to emit ultrasonic waves, the excitation signal is supplied to an emission chip by an excitation power supply, and the emission chip generates the ultrasonic waves according to preset excitation signal information. Ultrasonic waves enter human tissues; in the process, the piezoelectric wafer receives echo signals reflected by human tissues, converts the echo signals into electric signals and sends the electric signals into an imaging device for ultrasonic imaging.
In the imaging process, excitation signals with different frequencies can be selected according to the required detection depth aiming at different human tissues, so that the ultrasonic image meets the diagnosis requirement of medical personnel. For shallower tissues (e.g., epithelial tissues), high frequency is used to improve image resolution; for deeper tissues (e.g., the abdominal cavity), a lower frequency is used to improve the ultrasound penetration.
The ultrasonic probe essentially has the function of a filter, converts an excitation signal into an ultrasonic wave (in a transmitting process), and converts a received echo signal into an electric signal (in a receiving process), and because the signal is transmitted and received through the probe, the amplitude-frequency characteristic of the probe has great influence on the finally received echo signal.
When the amplitude-frequency characteristic of the ultrasonic probe is relatively flat in the signal frequency range required by imaging, the image resolution can be ensured, and the detection depth can also be ensured. However, when the amplitude-frequency characteristic of the ultrasonic probe is not ideal, for example, in a frequency range of a signal required for imaging, if attenuation of a high-frequency part is serious, a high-frequency component of an obtained echo signal is too low, which may cause deterioration of image resolution; if the low frequency part is attenuated seriously, the detection depth is influenced.
Based on this, an embodiment of the present invention provides an ultrasonic imaging method, where an excitation signal is amplitude-modulated based on an amplitude-frequency characteristic of an ultrasonic probe, and then a piezoelectric crystal is excited to emit an ultrasonic wave, so that on one hand, the excitation signal meets a requirement on a detection depth, and on the other hand, frequency components of a received echo signal are rich enough to meet imaging requirements.
FIG. 1 is a flow chart of a method of ultrasound imaging shown in an exemplary embodiment of the invention, the method comprising the steps of:
Before the human tissue is subjected to ultrasonic scanning, a window function meeting the diagnosis requirement of medical personnel is determined, so that the excitation signal is subjected to amplitude modulation in the subsequent ultrasonic scanning process of the human tissue.
The manufacturer of the ultrasonic probe can provide the amplitude-frequency characteristic of the ultrasonic probe, the amplitude-frequency characteristic provided by the manufacturer can be directly used in the embodiment, and the amplitude-frequency characteristic of the ultrasonic probe can be automatically detected by means of an oscilloscope.
Fig. 2 is a flowchart illustrating a specific implementation manner of step 101 according to an exemplary embodiment of the present invention, where step 101 includes:
step 101-1, amplitude modulating the initial excitation signal with a plurality of window functions respectively.
The initial excitation signal information (including the frequency, the number of pulses, the pulse width, etc. of the excitation signal) is configured in advance in the ultrasonic device, and is used for controlling the transmitting chip to generate the corresponding initial excitation signal. The same initial excitation signal information is configured for the same scanning mode, and the echo signal obtained thereby is not necessarily required for medical staff to diagnose diseases under the influence of the ultrasonic probe, so that the initial excitation signal needs to be amplitude-modulated.
In step 101-1, the initial excitation signal is amplitude modulated, i.e. the product of the window function and the initial excitation signal is calculated.
The initial excitation signal curve shown in fig. 3b is amplitude modulated using a window function as the gaussian window shown in fig. 3a as an example, and the resulting curve is shown in fig. 3 c.
And step 101-2, performing convolution operation on each excitation signal subjected to amplitude modulation and amplitude-frequency characteristics twice.
Because the excitation signal is transmitted by the ultrasonic probe, and the echo signal is received by the ultrasonic probe, which is equivalent to that the amplitude-frequency characteristic of the ultrasonic probe performs two convolution operations on the signal for ultrasonic image reconstruction, in the process of selecting the window function, two convolution operations need to be performed on each excitation signal subjected to amplitude modulation based on the amplitude-frequency characteristic.
And step 101-3, determining a window function corresponding to the target convolution operation result signal as a target window function.
And the target convolution operation result signal is a signal of which the ratio of the energy of the first frequency component to the energy of the second frequency component in the signal after two times of convolution operation reaches a preset ratio range. The energy of the first frequency component is the integration result of the frequencies in the first range and the corresponding signal amplitudes, and the energy of the second frequency component is the integration result of the frequencies in the second range and the corresponding signal amplitudes.
Referring to fig. 3d, a curve L1 is a simulation result curve obtained by superimposing amplitude-frequency characteristics twice on the curve shown in fig. 3b (the initial excitation signal without window function modulation), and a curve L2 is a simulation result curve obtained by superimposing amplitude-frequency characteristics twice on the curve shown in fig. 3c (the initial excitation signal with window function modulation). It can be seen from the figure that the energy ratio of the high-frequency component of the curve L2 (the integral result of the frequency of 4-6 MHz and the corresponding signal amplitude in the figure, that is, the area enclosed by the curve segment corresponding to the frequency of 4-6 MHz in the curve and the abscissa) is greater than the energy ratio of the high-frequency component of the curve L1, that is, the window function curve shown in fig. 3a can compensate the problem of serious attenuation of the high-frequency component caused by the ultrasonic probe to a certain extent, and then the echo signal meeting the diagnosis requirement of medical care personnel can be obtained by selecting different window functions.
It should be noted that the energy of the high frequency component and the energy of the low frequency component (the area enclosed by the curve segment corresponding to the frequency of 2 to 4MHz in the curve and the abscissa) are not limited to the 4MHz boundary used in the present embodiment, and the boundary for distinguishing the high frequency component and the low frequency component may be defined for different curves.
For the curve L2, if the ratio of the energy of the first frequency component (low frequency component) to the energy of the second frequency component (high frequency component) reaches a preset ratio range, determining the current window function as a target window function; if the ratio of the energy of the first frequency component (low-frequency component) to the energy of the second frequency component (high-frequency component) does not reach the preset ratio range, the initial excitation signal is subjected to amplitude modulation by using the next window function. The preset ratio range is set according to actual requirements such as the depth of the human tissue scanned by the ultrasonic wave, the image resolution and the like.
After the target window function is determined in step 101, if ultrasound scanning of the body tissue is required, step 102 is performed.
And 102, performing amplitude modulation on the initial excitation signal by using a target window function to obtain a target excitation signal.
In this embodiment, a specific implementation process of performing amplitude modulation on the initial excitation signal by using the target window function is similar to that in step 101-1, and is not described herein again. After the target excitation signal is obtained through design, the transmitting chip can be controlled to output the corresponding excitation signal according to parameters such as the pulse number, the frequency and the pulse width of the target excitation signal, so that the wafer of the ultrasonic probe is excited by the target excitation signal to transmit ultrasonic waves.
In another embodiment, in the process of amplitude modulating the initial excitation signal, after the product operation is performed on the initial excitation signal by using the target window function, the number of pulses of the product operation result signal (for example, the signal curve shown in fig. 3 c) may be increased, so that the energy difference between the product operation result signal after increasing the number of pulses and the initial excitation signal is smaller than the preset energy range, that is, the number of pulses of the curve shown in fig. 3c is appropriately increased, so as to ensure that the area enclosed by the curve shown in fig. 3c and the abscissa is substantially consistent with the area enclosed by the curve shown in fig. 3b and the abscissa.
103, after the ultrasonic probe transmits the ultrasonic wave generated based on the target excitation signal, establishing an ultrasonic image according to the echo signal received by the ultrasonic probe.
Wherein the echo signal is a signal reflected by a human tissue scanned by the ultrasonic wave and received by the probe.
In this embodiment, before performing ultrasonic scanning, amplitude modulation is performed on the initial excitation signal by using a window function, so that a ratio of energy of a low-frequency component (a first frequency component) to energy of a high-frequency component (a second frequency component) of an echo signal received by an ultrasonic probe meets a requirement of medical diagnosis of a medical worker, and an ultrasonic image desired by the medical worker is reconstructed.
In the ultrasonic imaging method shown in fig. 1, the obtained target excitation signal is a continuous wave, and the control of the transmission power and thus the amplitude of the initial excitation signal can be realized by controlling the voltage output by the excitation power supply, but it is difficult to change the voltage quickly and reliably. Based on this, fig. 4 is a flowchart of another ultrasound imaging method shown in an exemplary embodiment of the invention, the method comprising the steps of:
The pulse signal can use a signal with smaller amplitude, so that the voltage output by the excitation power supply is always in a human body safety range, the voltage is kept unchanged in the ultrasonic scanning process, the emission duration of the emission chip is controlled according to the pulse width of the target excitation signal, and the sensitivity is higher.
Fig. 5 is a flowchart illustrating a specific implementation manner of step 403, where step 403 includes:
step 403-1, performing an integration operation on the amplitude-modulated excitation signal.
And step 403-2, determining the target pulse width according to the integration operation result and the amplitude of the pulse signal.
In the embodiment, a pulse signal with smaller amplitude is adopted, so that the voltage output by the excitation power supply is always within the safety range of a human body.
And 403-3, adjusting the width of the pulse signal according to the target pulse width to obtain a target excitation signal.
And 404, after the ultrasonic probe transmits ultrasonic waves generated based on the target excitation signals, establishing an ultrasonic image according to echo signals received by the ultrasonic probe.
The specific implementation processes of step 401, step 402, and step 404 are similar to those of steps 101 to 103, and are not described here again.
In this embodiment, after the amplitude-modulated signal is obtained, an integration operation is performed to obtain an area, and then the area information is converted into pulse width information, so as to obtain a target excitation signal after pulse width modulation.
The invention also provides an embodiment of the ultrasonic imaging device, corresponding to the ultrasonic imaging method embodiment.
FIG. 6 is a block diagram of an ultrasonic imaging apparatus, which is applied to an ultrasonic imaging device including an ultrasonic probe including a piezoelectric wafer, according to an exemplary embodiment of the present invention; the ultrasonic imaging apparatus includes: a selection module 61 and an amplitude modulation module 62.
The selection module 61 is used for selecting a target window function according to the amplitude-frequency characteristic of the ultrasonic probe;
the amplitude modulation module 62 is configured to perform amplitude modulation on the initial excitation signal by using the target window function to obtain a target excitation signal, so that after the ultrasonic probe transmits the ultrasonic wave, a ratio of energy of a first frequency component to energy of a second frequency component of an echo signal received by the ultrasonic probe reaches a preset ratio range, where the ultrasonic wave is generated by exciting the piezoelectric wafer by using the target excitation signal.
Optionally, when the target window function is used to perform amplitude modulation on the initial excitation signal, the amplitude modulation module is specifically configured to:
performing product operation on the target window function and the initial excitation signal to obtain a product operation result signal;
and increasing the pulse number of the product operation result signal so that the energy difference between the product operation result signal after the pulse number is increased and the initial excitation signal is smaller than a preset energy range.
Optionally, the ultrasound imaging apparatus further comprises:
and the pulse width modulation module is used for carrying out pulse width modulation on the pulse signal according to the excitation signal subjected to amplitude modulation, and taking the signal subjected to pulse width modulation as the target excitation signal.
Optionally, when the pulse signal is pulse-width modulated according to the amplitude-modulated excitation signal, the pulse-width modulation module is specifically configured to:
performing integral operation on the excitation signal subjected to amplitude modulation;
determining a target pulse width according to the integral operation result and the amplitude of the pulse signal;
and adjusting the pulse width of the pulse signal according to the target pulse width, and taking the pulse signal subjected to pulse width adjustment as a target excitation signal.
Optionally, the selection module is specifically configured to:
respectively carrying out amplitude modulation on the initial excitation signals by using a plurality of window functions;
performing convolution operation twice on each excitation signal subjected to amplitude modulation and the amplitude-frequency characteristic;
and determining a window function corresponding to the target convolution operation result signal as a target window function, wherein the target convolution operation result signal is a signal of which the ratio of the energy of the first frequency component to the energy of the second frequency component in the signal after two times of convolution operation reaches the preset ratio range.
For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the disclosed solution. One of ordinary skill in the art can understand and implement without inventive effort.
Fig. 7 is a schematic diagram of an electronic device according to an exemplary embodiment of the present invention, and illustrates a block diagram of an exemplary electronic device 70 suitable for implementing embodiments of the present invention. The electronic device 70 shown in fig. 7 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiment of the present invention.
As shown in fig. 7, electronic device 70 may take the form of a general-purpose computing device, which may be, for example, a server device. The components of electronic device 70 may include, but are not limited to: the at least one processor 71, the at least one memory 72, and a bus 73 that couples various system components including the memory 72 and the processor 71.
The bus 73 includes a data bus, an address bus, and a control bus.
The memory 72 can include volatile memory, such as Random Access Memory (RAM) 721 and/or cache memory 722, and can further include Read Only Memory (ROM) 723.
The processor 71 executes various functional applications and data processing, such as the methods provided by any of the above embodiments, by running a computer program stored in the memory 72.
The electronic device 70 may also communicate with one or more external devices 74 (e.g., keyboard, pointing device, etc.). Such communication may be through an input/output (I/O) interface 75. Also, the model-generating electronic device 70 may also communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet) via the network adapter 76. As shown, the network adapter 76 communicates with the other modules of the model-generating electronic device 70 via a bus 73. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the model-generating electronic device 70, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems, etc.
It should be noted that although in the above detailed description several units/modules or sub-units/modules of the electronic device are mentioned, such a division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more of the units/modules described above may be embodied in one unit/module according to embodiments of the invention. Conversely, the features and functions of one unit/module described above may be further divided into embodiments by a plurality of units/modules.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An ultrasonic imaging method is characterized by being applied to an ultrasonic imaging device, wherein the ultrasonic imaging device comprises an ultrasonic probe, and the ultrasonic probe comprises a piezoelectric wafer;
the ultrasonic imaging method comprises the following steps:
selecting a target window function according to the amplitude-frequency characteristics of the ultrasonic probe, comprising: respectively carrying out amplitude modulation on the initial excitation signals by using a plurality of window functions; performing convolution operation twice on each excitation signal subjected to amplitude modulation and the amplitude-frequency characteristic; determining a window function corresponding to a target convolution operation result signal as a target window function, wherein the target convolution operation result signal is a signal of which the ratio of the energy of a first frequency component to the energy of a second frequency component in the signal after two times of convolution operation reaches a preset ratio range;
and performing amplitude modulation on the initial excitation signal by using the target window function to obtain a target excitation signal, so that after the ultrasonic probe transmits ultrasonic waves, the ratio of the energy of the first frequency component to the energy of the second frequency component of the echo signal received by the ultrasonic probe reaches a preset ratio range, wherein the ultrasonic waves are generated by exciting the piezoelectric wafer by using the target excitation signal.
2. An ultrasonic imaging method according to claim 1, wherein amplitude modulating the initial excitation signal using the target window function comprises:
performing product operation on the target window function and the initial excitation signal to obtain a product operation result signal;
and increasing the pulse number of the product operation result signal so that the energy difference between the product operation result signal after the pulse number is increased and the initial excitation signal is smaller than a preset energy range.
3. An ultrasonic imaging method according to claim 1 or 2, wherein after amplitude modulating the initial excitation signal using the target window function, further comprising:
and performing pulse width modulation on the pulse signal according to the amplitude-modulated excitation signal, and taking the pulse width-modulated signal as a target excitation signal.
4. An ultrasonic imaging method according to claim 3, wherein pulse-width modulating the pulse signal in accordance with the amplitude-modulated excitation signal comprises:
performing integral operation on the excitation signal subjected to amplitude modulation;
determining a target pulse width according to the integral operation result and the amplitude of the pulse signal;
and adjusting the pulse width of the pulse signal according to the target pulse width, and taking the pulse signal subjected to pulse width adjustment as a target excitation signal.
5. An ultrasonic imaging device is characterized by being applied to ultrasonic imaging equipment, wherein the ultrasonic imaging equipment comprises an ultrasonic probe, and the ultrasonic probe comprises a piezoelectric wafer;
the ultrasonic imaging apparatus includes:
the selection module is used for selecting a target window function according to the amplitude-frequency characteristics of the ultrasonic probe;
the amplitude modulation module is used for carrying out amplitude modulation on the initial excitation signal by using the target window function to obtain a target excitation signal, so that after the ultrasonic probe transmits ultrasonic waves, the ratio of the energy of a first frequency component to the energy of a second frequency component of echo signals received by the ultrasonic probe reaches a preset ratio range, wherein the ultrasonic waves are generated by exciting the piezoelectric wafer by using the target excitation signal;
the selection module is specifically configured to: respectively carrying out amplitude modulation on the initial excitation signals by using a plurality of window functions; performing convolution operation twice on each excitation signal subjected to amplitude modulation and the amplitude-frequency characteristic; and determining a window function corresponding to the target convolution operation result signal as a target window function, wherein the target convolution operation result signal is a signal of which the ratio of the energy of the first frequency component to the energy of the second frequency component in the signal after two times of convolution operation reaches the preset ratio range.
6. The ultrasound imaging apparatus according to claim 5, wherein, in amplitude modulating the initial excitation signal using the target window function, the amplitude modulation module is specifically configured to:
performing product operation on the target window function and the initial excitation signal to obtain a product operation result signal;
and increasing the pulse number of the product operation result signal so that the energy difference between the product operation result signal after the pulse number is increased and the initial excitation signal is smaller than a preset energy range.
7. The ultrasonic imaging apparatus according to claim 5 or 6, further comprising:
and the pulse width modulation module is used for carrying out pulse width modulation on the pulse signal according to the excitation signal subjected to amplitude modulation, and taking the signal subjected to pulse width modulation as the target excitation signal.
8. The ultrasound imaging apparatus according to claim 7, wherein, in pulse-width modulating the pulse signal according to the amplitude-modulated excitation signal, the pulse-width modulation module is specifically configured to:
performing integral operation on the excitation signal subjected to amplitude modulation;
determining a target pulse width according to the integral operation result and the amplitude of the pulse signal;
and adjusting the pulse width of the pulse signal according to the target pulse width, and taking the pulse signal subjected to pulse width adjustment as a target excitation signal.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the ultrasound imaging method of any of claims 1 to 4 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the ultrasound imaging method of any of claims 1 to 4.
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