Ultrasonic Resolution Adaptive Adjustment Method, Device and Medium Based on Pulse Excitation

Abstract

The present invention relates to an ultrasonic resolution adaptive adjustment method, device and medium based on pulse excitation, and relates to the technical field of ultrasonic imaging. For different voltage values of the second excitation pulse, the optimal time intervals are sequentially selected by rotation. Specifically, the interval times t1 of different multiples i are sequentially selected by rotation, and loop feedback is performed to select the optimal interval time i*t1 as the emission interval time T, so as to achieve the shortest echo duration, thereby achieving the effect of improving the resolution. The present invention improves the ultrasonic longitudinal resolution through the transformation of the excitation mode to realize the improvement of the ultrasonic image; the optimal longitudinal resolution can be automatically identified and determined through the adaptive feedback process, reducing manual test operations; this function can be realized without changing the existing hardware of the current product or with a small amount of change to the existing hardware, and the transformation cost is low.

Description

Technical Field

[0001] The present invention relates to the field of ultrasonic imaging technology, and particularly relates to an ultrasonic resolution adaptive adjustment method, device and medium based on pulse excitation. Background Technique

[0002] Due to the characteristics of ultrasound such as non-radiation, safety, and high real-time performance, using ultrasound detection has become one of the most commonly used methods in medical detection. Ultrasonic imaging is to use ultrasonic waves to scan the detected part and receive and process the reflected signals to obtain an image of the internal morphology of the detected part. The common implementation methods are mostly to use high-voltage pulse excitation to make the transducer emit ultrasonic pulse waves. After the ultrasonic pulse waves enter the human body, due to the different acoustic impedances of different organ tissues in the human body, the ultrasonic waves are partially reflected, refracted, absorbed, etc. at the interfaces of different tissues or organs. The transducer is used to receive the reflected ultrasonic waves, and after a series of circuit and software algorithm processing, an ultrasonic image is formed. Currently, there are many types of commonly used ultrasonic imaging devices, including A-mode ultrasound, B-mode ultrasound, M-mode ultrasound, etc. Ultrasonic imaging has the advantages of real-time continuous imaging, no impact on the health and safety of patients and medical staff, low cost, and easy to move.

[0003] Among the parameters for evaluating ultrasonic images and ultrasonic devices, longitudinal resolution is a crucial key parameter. It determines the minimum recognition interval of the ultrasonic image in the depth direction. Therefore, improving the resolution of the ultrasonic image directly determines the application value of the ultrasonic image and is one of the hot research topics in ultrasonic imaging.

[0004] Currently, there are the following ideas for improving the resolution of ultrasonic images:

[0005] 1. Increase the ultrasonic frequency. The higher the ultrasonic frequency, the shorter the ultrasonic wavelength, and the higher its resolution. However, the higher the frequency, the faster the attenuation in the body, and the shallower the detectable depth.

[0006] 2. Use software algorithms for data processing. This method is the most common and has the most types, including beamforming technology, super-resolution imaging technology, synthetic aperture technology, etc.

[0007] 3. Modify the ultrasonic hardware circuit. For example, use a short pulse length and a lower noise chip to improve the signal-to-noise ratio, etc.

[0008] In the process of using the hardware circuit to excite the transducer to generate ultrasonic waves, the most common ones are pulse spike and pulse square wave excitation, which are currently the most widely used methods. The method of using sine wave emission excitation is also applied. This excitation method and the corresponding frequency transducer combination achieve conventional ultrasonic emission. Without considering the differences in other software algorithms and hardware receiving systems, the resolution of the ultrasonic image depends on the resonant frequency of the transducer.

[0009] Under the condition that the resonant frequency of the transducer remains unchanged, in order to further improve the longitudinal resolution, the present invention proposes a pulse excitation method, which combines the way of echo feedback traversal to improve the resolution of ultrasound without changing or slightly modifying the existing hardware circuit architecture. Summary of the Invention

[0010] To achieve the above objects and other advantages of the present invention, the first object of the present invention is to provide an ultrasonic resolution adaptive adjustment method based on pulse excitation, including the following steps:

[0011] Obtain the voltage value of the second excitation pulse set, and the voltage value of the second excitation pulse is less than the voltage value of the first excitation pulse;

[0012] Obtain the interval time according to the resonant frequency of the transducer;

[0013] Obtain the echo longitudinal resolution corresponding to the received first excitation pulse signal, denoted as the standard emission resolution;

[0014] Obtain the echo longitudinal resolution corresponding to the received excitation pulse superimposed signal, denoted as the echo longitudinal resolution; wherein, the excitation pulse superimposed signal is a superimposed signal of the previously emitted first excitation pulse signal and the second excitation pulse signal emitted after several interval times;

[0015] If the echo longitudinal resolution is less than the standard emission resolution, obtain the echo longitudinal resolution corresponding to the received new excitation pulse superimposed signal, denoted as the new echo longitudinal resolution; wherein, the new excitation pulse superimposed signal is a superimposed signal obtained by increasing the interval time in the previous excitation pulse superimposed signal;

[0016] Judge whether the new echo longitudinal resolution is less than the previous echo longitudinal resolution;

[0017] If yes, jump to the step of obtaining the echo longitudinal resolution corresponding to the received new excitation pulse superimposed signal and execute the loop;

[0018] Otherwise, take the current echo longitudinal resolution as the optimal resolution at the current voltage value of the second excitation pulse, and take the current total interval time as the emission interval time at the current voltage value of the second excitation pulse;

[0019] Obtain the next voltage value of the second excitation pulse set, jump to the step of obtaining the echo longitudinal resolution corresponding to the received excitation pulse superimposed signal and execute the loop until the optimal resolutions and emission interval times corresponding to all voltage values of the second excitation pulse set are detected;

[0020] Compare the optimal resolutions and emission interval times corresponding to all voltage values of the second excitation pulse, and select the optimal resolution with the highest value and its corresponding emission interval time as the final optimal resolution and the final emission interval time, respectively.

[0021] Further, the acquisition of the longitudinal resolution of the echo includes the following steps:

[0022] The controller emits an excitation pulse signal, and the excitation pulse signal includes a first excitation pulse signal and an excitation pulse superimposed signal;

[0023] Amplify the echo signal corresponding to the excitation pulse signal through a low-noise amplifier and a time gain amplifier;

[0024] Directly collect the amplified echo signal;

[0025] The controller performs envelope demodulation processing on the collected echo data to obtain envelope data;

[0026] Find the maximum value in the envelope data. Taking the maximum value as the standard, find the numerical position of the preset spectral width, calculate the corresponding time interval, and obtain the longitudinal resolution of the echo.

[0027] Further, the acquisition of the longitudinal resolution of the echo includes the following steps:

[0028] The controller emits an excitation pulse signal, and the excitation pulse signal includes a first excitation pulse signal and an excitation pulse superimposed signal;

[0029] Amplify the echo signal corresponding to the excitation pulse signal through a low-noise amplifier and a time gain amplifier;

[0030] The amplified signal is processed by an envelope detector to obtain an envelope signal;

[0031] The envelope signal is processed by a comparator to obtain a square wave signal, record the time of the high level of the square wave, and use the time of the high level of the square wave as the ultrasonic longitudinal resolution time.

[0032] Further, the step of recording the time of the high level of the square wave and using the time of the high level of the square wave as the ultrasonic longitudinal resolution time includes the following steps:

[0033] Detect the time of the high level of the square wave through the controller.

[0034] Further, the step of recording the time of the high level of the square wave and using the time of the high level of the square wave as the ultrasonic longitudinal resolution time includes the following steps:

[0035] Detect the rising edge time and falling edge time of the square wave signal through a time-to-digital conversion chip, and the difference between the rising edge time and the falling edge time is the high level time of the square wave.

[0036] Further, the interval time is less than one order of magnitude of the time period corresponding to the resonance frequency of the transducer.

[0037] Further, the preset spectral width is -6dB spectral width or -20dB spectral width.

[0038] Further, the voltage value of the set second excitation pulse includes setting the voltage value of the second excitation pulse to 20%, 40%, 60%, 80% of the voltage value of the first excitation pulse.

[0039] The second object of the present invention is to provide an electronic device, including: a memory on which program code is stored; a processor coupled to the memory, and when the program code is executed by the processor, an ultrasonic resolution adaptive adjustment method based on pulse excitation is implemented.

[0040] The third object of the present invention is to provide a computer-readable storage medium on which program instructions are stored, and when the program instructions are executed, an ultrasonic resolution adaptive adjustment method based on pulse excitation is implemented.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] The present invention provides an ultrasonic resolution adaptive adjustment method based on pulse excitation, which improves the ultrasonic longitudinal resolution through the transformation of the excitation method to achieve the improvement of ultrasonic images.

[0043] The present invention can automatically identify and determine the optimal longitudinal resolution through an adaptive feedback process, reducing manual test operations. And in the case of poor consistency of multiple transducers, the effect is more obvious, and the targeted delay emission time can be realized for different transducers, so as to have a wider adaptability.

[0044] The present invention can implement this function without changing the existing hardware of the current product or with a small amount of change to the existing hardware, and the transformation cost is low.

[0045] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following takes the preferred embodiments of the present invention and combines the drawings to describe in detail as follows. The specific implementation manners of the present invention are given in detail by the following embodiments and their drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0047] Figure 1 Flow chart of the ultrasonic resolution adaptive adjustment method based on pulse excitation in Embodiment 1;

[0048] Figure 2 Schematic diagram of the excitation pulse signal and echo signal in Embodiment 1;

[0049] Figure 3 Schematic diagram of the echo receiving circuit in Embodiment 1 Figure 1 ;

[0050] Figure 4 Schematic diagram of the echo signal processing process in Embodiment 1;

[0051] Figure 5 Schematic diagram of the echo receiving circuit in Embodiment 1 Figure 2 ;

[0052] Figure 6 Schematic diagram of the electronic device in Embodiment 2;

[0053] Figure 7 Schematic diagram of the computer-readable storage medium in Embodiment 3. Specific implementation manners

[0054] Next, in combination with the accompanying drawings and specific implementation manners, the present invention will be further described. It should be noted that, on the premise of no conflict, any combination of the following-described embodiments or technical features can form a new embodiment.

[0055] Embodiment 1

[0056] The ultrasonic resolution adaptive adjustment method based on pulse excitation, as Figure 1 shown, includes the following steps:

[0057] Obtain the voltage value VP2 of the set second excitation pulse P2, and the voltage value VP2 of the second excitation pulse P2 is less than the voltage value VP1 of the first excitation pulse P1; both the first excitation pulse and the second excitation pulse are high-voltage excitation pulses, which can be spike pulses or square wave pulses.

[0058] The voltage of the second excitation pulse P2 is an important factor for improving the resolution and reducing the near-field oscillation. Therefore, several different voltage ratios can be selected. For example, select the voltage value VP2 of the second excitation pulse P2 to be 20%, 40%, 60%, and 80% of the voltage value VP1 of the first excitation pulse P1. Then, sequentially select the corresponding optimal transmission interval time T according to the following time round-robin steps to obtain the corresponding ultrasonic echo time resolution S. Compare the S corresponding to different voltage values of the second excitation pulse P2, and select the optimal ultrasonic echo time resolution therefrom.

[0059] Obtain the interval time t1 according to the resonant frequency F of the transducer; the interval time is less than one order of magnitude of the time period corresponding to the resonant frequency of the transducer. For example, set t1 as 1 / (10*F). For a transducer with a resonant frequency of 1M, its time period is 1us, then t1 can be selected as 100ns.

[0060] Transmit the first excitation pulse signal P1;

[0061] Obtain the echo longitudinal resolution corresponding to the received first excitation pulse signal, denoted as the standard emission resolution Rv1;

[0062] The interval time T between the first excitation pulse signal P1 and the second excitation pulse signal P2 is an important factor for improving the resolution and reducing the near-field oscillation. Therefore, each time a small interval time t1 (t1 < T) is moved, the circuit detects and records the echo duration. The software and hardware system sequentially selects different multiples i of t1 and performs loop feedback, so as to select the optimal time i*t1 as the emission interval time T, achieve the shortest echo duration, and thus realize the function of improving the resolution. The specific steps are as follows:

[0063] Such as Figure 2 As shown, after transmitting the first excitation pulse signal P1, the second excitation pulse signal P2 is transmitted at a very short emission interval time T, so that the two pulse echoes are superimposed, thereby reducing the echo duration. In this embodiment, after transmitting the first excitation pulse signal, the second excitation pulse signal P2 is transmitted after an interval time t1. It should be noted that the interval time between the first excitation pulse signal and the second excitation pulse signal can be set as other multiples of the interval time t1 according to the actual situation.

[0064] Since the transducer works based on the piezoelectric effect and the inverse piezoelectric effect. The first excitation causes the piezoelectric element of the transducer to vibrate. As long as the vibration generated by the second excitation is just out of phase with the previous vibration of the piezoelectric element by a certain phase, the original vibration mode can be changed. For example, when the piezoelectric element is in the compression stage, the second excitation causes the piezoelectric element to expand, increasing the damping, thereby weakening the subsequent unwanted and excessive vibrations and tails. Therefore, from the perspective of the transducer, the excitation pulse signal P2 emitted for the second time effectively shortens the oscillation of the transducer, making the near-field oscillation of the ultrasonic echo shorter. Therefore, through this excitation method, not only can the time of the near-field oscillation be effectively increased, making the near-field blind area of the ultrasonic image smaller, but also the ultrasonic longitudinal resolution can be improved.

[0065] Obtain the echo longitudinal resolution corresponding to the received excitation pulse superimposed signal, denoted as the echo longitudinal resolution Rv2; where the excitation pulse superimposed signal is the superimposed signal of the first excitation pulse signal transmitted first and the second excitation pulse signal transmitted after several interval times;

[0066] If the longitudinal resolution of the echo is not less than the standard emission resolution, check the resonant frequency parameter of the transducer and whether the input interval time t1 is correct, or replace it with a smaller time interval t1.

[0067] If the longitudinal resolution of the echo is less than the standard emission resolution, continue to transmit the first excitation pulse signal P1, and transmit the second excitation pulse signal P2 after increasing the interval time t1 by several times compared with the previous time. For example, after transmitting the first excitation pulse signal P1, delay 2*t1 and then transmit the second excitation pulse signal P2. It should be noted that the interval time between the current two signals can be increased by multiple multiples i of t1 compared with the interval time between the previous two signals, that is, it can be set according to actual needs.

[0068] Obtain the longitudinal resolution of the echo corresponding to the received new excitation pulse superimposed signal, denoted as the new echo longitudinal resolution Rv3; where the new excitation pulse superimposed signal is the superimposed signal obtained by increasing the interval time in the previous excitation pulse superimposed signal;

[0069] Judge whether the new echo longitudinal resolution is less than the previous echo longitudinal resolution;

[0070] If yes, jump to the step of obtaining the longitudinal resolution of the echo corresponding to the received new excitation pulse superimposed signal and execute it in a loop, that is, continue to perform the next step of transmitting the first excitation pulse signal P1 and delaying 3*t1 to transmit the second excitation pulse signal P2;

[0071] Otherwise, use the current longitudinal resolution of the echo as the optimal resolution at the current voltage value of the second excitation pulse, and use the current total interval time as the emission interval time at the current voltage value of the second excitation pulse; that is, the optimal resolution at the current voltage value of the second excitation pulse is Rv2, and the emission interval time T = 2*t1. And so on.

[0072] Obtain the next voltage value of the second excitation pulse set, jump to the step of obtaining the longitudinal resolution of the echo corresponding to the received excitation pulse superimposed signal and execute it in a loop until the optimal resolutions and emission interval times corresponding to all voltage values of the second excitation pulse set are detected;

[0073] Compare the optimal resolutions and emission interval times corresponding to all voltage values of the second excitation pulse, and select the optimal resolution with the highest value and its corresponding emission interval time as the final optimal resolution and the final emission interval time respectively.

[0074] The acquisition of the above various longitudinal resolutions of the echo includes the following steps:

[0075] As Figure 5 shown, the controller transmits an excitation pulse signal, and the excitation pulse signal includes a first excitation pulse signal and an excitation pulse superimposed signal;

[0076] The echo signal corresponding to the excitation pulse signal is collected by an ADC chip;

[0077] The controller (such as an FPGA / DSP controller or a host computer) performs envelope demodulation processing on the collected echo data to obtain envelope data; the envelope demodulation methods include quadrature demodulation detection, Hilbert transform method detection, etc.;

[0078] Find the maximum value in the envelope data. Taking the maximum value as the standard, find the numerical position of the preset spectral width. The preset spectral width is the -6dB spectral width or the -20dB spectral width, etc. For example, find the numerical position of -6dB downward, calculate the corresponding time interval, and obtain the longitudinal resolution of the echo.

[0079] The accuracy of obtaining the longitudinal resolution of the echo in this way depends on the ADC sampling frequency. The advantage is that only software-side processing is required without changing the hardware structure.

[0080] The longitudinal resolution of the echo can also be obtained in the following way:

[0081] Such as Figure 3 shown, the controller transmits an excitation pulse signal, and the excitation pulse signal includes a first excitation pulse signal and an excitation pulse superimposed signal;

[0082] Such as Figure 4 shown, the echo signal corresponding to the excitation pulse signal is amplified by a low-noise amplifier and a time gain amplifier;

[0083] The amplified signal is processed by an envelope detector to obtain an envelope signal;

[0084] The envelope signal enters a comparator. By setting a comparison threshold, the envelope echo signal is converted into a square wave signal, and the time of the high level of the square wave is recorded. The time of the high level of the square wave is used as the ultrasonic longitudinal resolution time. Among them, the set comparison threshold is that the controller controls the DAC to output a scanning voltage to obtain the maximum voltage value Vmax of the envelope signal, and then selects the corresponding voltage value according to actual needs. For example, select the voltage value of Vmax / 2 or Vmax / 10, that is, -6dB or -20dB of Vmax as the comparison threshold.

[0085] After the comparator, the measurement of the high-level time of the square wave can be achieved by the controller detecting the high-level time of the square wave. Specifically, the square wave signal is input to the pins of the FPGA / DSP controller, and the FPGA / DSP device is used to detect the time of the square wave. The accuracy of this detection method is directly related to the main frequency of the FPGA / DSP controller. The higher the main frequency, the higher the time accuracy. Taking the FPGA controller as an example, Xilinx Virtex-7 FPGA series products with a speed grade of -3 can be selected. Its maximum main frequency is 741 MHz, and the main frequency of the programmed program is set at 500 MHz. In this way, the maximum error in detecting time is 2 ns. Converting it into a distance error D = C * T = 1500 m / s * 2 ns = 3 μm, which can meet the requirements of low-frequency or medium-frequency medical ultrasound.

[0086] After the comparator, the measurement of the high-level time of the square wave can also be achieved by a time-to-digital conversion chip detecting the rising edge time and falling edge time of the square wave signal. The difference between the rising edge time and the falling edge time is the high-level time of the square wave. A time-to-digital conversion chip such as the TDC-GP22 chip can be used. This method increases the hardware cost and design complexity, but the time detection error is lower. Its time error is as low as 22 ps, which can meet the requirements of high-frequency medical ultrasound.

[0087] The present invention can adaptively identify and select the optimal resolution. The self-identified transmit interval time T can be used as a fixed value in the subsequent transmission process, thereby achieving the purpose of improving the resolution. The present invention can be applied not only to the ultrasonic probe with a single transducer element but also to the probe with multiple ultrasonic transducer elements, having a certain universality.

[0088] The present invention adjusts the transmission excitation pulse to reduce the duration of the ultrasonic echo waveform, thereby achieving the purpose of improving the resolution of ultrasound and the detection accuracy.

[0089] Embodiment 2

[0090] An electronic device 200, as Figure 6 shown, includes but is not limited to: a memory 201 on which program code is stored; a processor 202 connected to the memory, and when the program code is executed by the processor, it implements the method for adaptively adjusting the ultrasonic resolution based on pulse excitation. For the detailed description of the method, reference can be made to the corresponding description in the above method embodiments, which will not be elaborated here.

[0091] Embodiment 3

[0092] A computer-readable storage medium, as Figure 7As shown, program instructions are stored thereon, and the method for adaptively adjusting the ultrasonic resolution based on pulse excitation implemented when the program instructions are executed. For a detailed description of the method, reference can be made to the corresponding description in the above method embodiments, which will not be repeated here.

[0093] It should also be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "including one..." does not exclude the presence of another identical element in the process, method, commodity or device including the element.

[0094] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0095] The above is only for the embodiments of this specification and is not used to limit one or more embodiments of this specification. For those skilled in the art, one or more embodiments of this specification can have various changes and transformations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of this specification shall be included within the scope of the claims of one or more embodiments of this specification. One or more embodiments of this specification, one or more embodiments of this specification, one or more embodiments of this specification, one or more embodiments of this specification.

Claims

1. An ultrasonic resolution adaptive adjustment method based on pulse excitation, characterized in that Including the following steps: Obtain the voltage value of the set second excitation pulse, where the voltage value of the second excitation pulse is less than that of the first excitation pulse; Obtain the interval time according to the resonant frequency of the transducer; Obtain the echo longitudinal resolution corresponding to the received first excitation pulse signal, denoted as the standard emission resolution; Obtain the echo longitudinal resolution corresponding to the received excitation pulse superimposed signal, denoted as the echo longitudinal resolution; wherein, the excitation pulse superimposed signal is a superimposed signal of the first excitation pulse signal transmitted first and the second excitation pulse signal transmitted after several interval times; If the echo longitudinal resolution is less than the standard emission resolution, obtain the echo longitudinal resolution corresponding to the received new excitation pulse superimposed signal, denoted as the new echo longitudinal resolution; wherein, the new excitation pulse superimposed signal is a superimposed signal obtained by increasing the interval time in the previous excitation pulse superimposed signal; Judge whether the new echo longitudinal resolution is less than the previous echo longitudinal resolution; If yes, jump to the step of obtaining the echo longitudinal resolution corresponding to the received new excitation pulse superimposed signal and execute it in a loop; Otherwise, use the current echo longitudinal resolution as the optimal resolution at the current voltage value of the second excitation pulse, and use the current total interval time as the emission interval time at the current voltage value of the second excitation pulse; Obtain the next voltage value of the set second excitation pulse, jump to the step of obtaining the echo longitudinal resolution corresponding to the received excitation pulse superimposed signal and execute it in a loop until the optimal resolutions and emission interval times corresponding to all voltage values of the set second excitation pulse are detected; Compare the optimal resolutions and emission interval times corresponding to all voltage values of the second excitation pulse, and select the optimal resolution with the highest value and its corresponding emission interval time as the final optimal resolution and the final emission interval time respectively.

2. The method for adaptively adjusting the ultrasonic resolution based on pulse excitation according to claim 1, characterized in that, The obtaining of the echo longitudinal resolution includes the following steps: The controller transmits an excitation pulse signal, and the excitation pulse signal includes a first excitation pulse signal and an excitation pulse superimposed signal; Amplify and process the echo signal corresponding to the excitation pulse signal through a low-noise amplifier and a time gain amplifier; Directly collect the amplified echo signal; The controller performs envelope demodulation processing on the collected echo data to obtain envelope data; Find the maximum value in the envelope data, use the maximum value as the standard, find the numerical position of the preset spectral width, calculate the corresponding time interval, and obtain the echo longitudinal resolution.

3. The method for adaptively adjusting ultrasonic resolution based on pulse excitation according to claim 1, wherein The obtaining of the echo longitudinal resolution includes the following steps: The controller transmits an excitation pulse signal, and the excitation pulse signal includes a first excitation pulse signal and an excitation pulse superimposed signal; Amplify and process the echo signal corresponding to the excitation pulse signal through a low-noise amplifier and a time gain amplifier; The amplified signal is processed by an envelope detector to obtain an envelope signal; The envelope signal is processed by a comparator to obtain a square wave signal, record the time of the high level of the square wave, and use the time of the high level of the square wave as the ultrasonic longitudinal resolution time.

4. The ultrasonic resolution adaptive adjustment method based on pulse excitation according to claim 3, characterized in that The step of recording the time of the high level of the square wave and using the time of the high level of the square wave as the ultrasonic longitudinal resolution time includes the following steps: Detect the time of the high level of the square wave through the controller.

5. The method for adaptively adjusting ultrasonic resolution based on pulse excitation according to claim 3, wherein Recording the time of the high level of the square wave and taking the time of the high level of the square wave as the ultrasonic longitudinal resolution time includes the following steps: Detect the rising edge time and falling edge time of the square wave signal through a time-to-digital conversion chip, and the difference between the rising edge time and the falling edge time is the time of the high level of the square wave.

6. The method for adaptively adjusting ultrasonic resolution based on pulse excitation according to claim 1, wherein: The interval time is less than one order of magnitude of the time period corresponding to the resonant frequency of the transducer.

7. The method for adaptively adjusting ultrasonic resolution based on pulse excitation according to claim 2, characterized in that: The preset spectral width is the -6dB spectral width or the -20dB spectral width.

8. The method for adaptively adjusting ultrasonic resolution based on pulse excitation according to claim 1, wherein: The set voltage value of the second excitation pulse includes setting the voltage value of the second excitation pulse to 20%, 40%, 60%, or 80% of the voltage value of the first excitation pulse.

9. An electronic device, characterized in that, Comprising: A memory on which program code is stored; A processor coupled to the memory and, when the program code is executed by the processor, implementing the method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that, Program instructions are stored thereon, and when the program instructions are executed, the method according to any one of claims 1 to 8 is implemented.

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