Parameter determination method of ultrasonic imaging device, ultrasonic imaging device and storage medium

Abstract

The embodiment of the present invention provides a parameter determination method for an ultrasonic imaging device, an ultrasonic imaging device, and a storage medium. The method includes: determining the expected axial resolution, expected lateral resolution, and expected retraction resolution of the ultrasonic imaging device for ultrasonic retraction imaging; determining the imaging performance parameters of the transducer in the ultrasonic imaging device according to the expected axial resolution; determining the target imaging frame rate of the ultrasonic imaging device for ultrasonic retraction imaging according to the imaging performance parameters and the expected lateral resolution; determining the target frame spacing of the ultrasonic imaging device for ultrasonic retraction imaging according to the expected retraction resolution; determining the target retraction speed of the ultrasonic imaging device for ultrasonic retraction imaging according to the target frame spacing and the target imaging frame rate. In the above scheme, the determined imaging parameters meet the expected resolution; moreover, a higher retraction speed is provided, the inspection efficiency is improved, the negative impact of the cardiac cycle on ultrasonic imaging is reduced, and high-performance and time-effective imaging is achieved.

Description

Technical Field

[0001] The present invention relates to the field of medical equipment, and more specifically, to a method for determining parameters of an ultrasonic imaging device, an ultrasonic imaging device, an electronic device for the ultrasonic imaging device, a storage medium, and a computer program product. Background Art

[0002] With the development of ultrasound imaging technology, ultrasound imaging technology plays an increasingly important role in medical examinations. In the process of ultrasound imaging, the human body is scanned by ultrasound beams, and images of tissues or organs in the body are obtained by receiving and processing reflected signals. The obtained images can be used to determine the location, size, and shape of tissues or organs, and then determine the scope and physical properties of the lesions.

[0003] In related technologies, in order to obtain higher imaging performance, ultrasound imaging examinations require a long time, during which the morphology of tissues or organs may change with the cardiac cycle. As a result, the accuracy of ultrasound images may be low. In addition, for ultrasound imaging examinations performed during surgery, too long an examination time will reduce surgical efficiency and increase the risk to the subject. For this reason, it is hoped that the speed of ultrasound imaging examinations can be increased to improve the accuracy of ultrasound images and enhance the experience of the subject. Summary of the invention

[0004] The present invention has been made in view of the above-mentioned problems.

[0005] According to one aspect of the present invention, a method for determining parameters of an ultrasonic imaging device is provided. The method for determining parameters of an ultrasonic imaging device comprises:

[0006] Determining the expected axial resolution, expected lateral resolution, and expected pullback resolution of the ultrasound imaging device for ultrasound pullback imaging;

[0007] Determining imaging performance parameters of a transducer in an ultrasonic imaging device according to a desired axial resolution;

[0008] Determining a target imaging frame rate for ultrasonic pullback imaging by the ultrasonic imaging device according to the imaging performance parameters and the expected lateral resolution;

[0009] Determining a target frame spacing for ultrasonic pullback imaging by an ultrasonic imaging device according to a desired pullback resolution;

[0010] A target retraction speed of the ultrasonic imaging device for performing ultrasonic retraction imaging is determined according to the target frame spacing and the target imaging frame rate.

[0011] Exemplarily, determining the expected axial resolution, expected lateral resolution, and expected pullback resolution of an ultrasonic imaging device for ultrasonic pullback imaging includes: acquiring a parameter set of a target tissue to be subjected to ultrasonic pullback imaging, wherein the parameter set includes a tissue structure size; and determining the expected axial resolution, expected lateral resolution, and expected pullback resolution of the ultrasonic imaging device for ultrasonic pullback imaging based on the tissue structure size in the parameter set of the target tissue.

[0012] Exemplarily, the imaging performance parameters include center frequency and focal length; the parameter determination method of the ultrasonic imaging device also includes: obtaining the size of the emitting surface of the transducer of the ultrasonic imaging device; determining the imaging performance parameters of the transducer in the ultrasonic imaging device according to the desired axial resolution, including: determining the center frequency of the transducer according to the desired axial resolution; determining the focal length of the transducer according to the center frequency of the transducer and the size of the emitting surface.

[0013] Exemplarily, determining the focal length of the transducer according to the center frequency of the transducer and the size of the emitting surface includes: determining the wavelength of the ultrasonic wave emitted by the transducer according to the center frequency; and determining the focal length according to the size of the emitting surface and the wavelength.

[0014] Exemplarily, the ratio of the imaging frame rate corresponding to the desired lateral resolution to the target imaging frame rate is within a first ratio interval; and the ratio of the desired pullback resolution to the target frame spacing is within a second ratio interval.

[0015] Exemplarily, a target imaging frame rate for ultrasonic pullback imaging performed by an ultrasonic imaging device is determined based on imaging performance parameters and desired lateral resolution, including: determining an imaging frame rate corresponding to the desired lateral resolution based on the imaging performance parameters; and determining a target imaging frame rate based on the imaging frame rate corresponding to the desired lateral resolution.

[0016] Exemplarily, the imaging frame rate corresponding to the desired lateral resolution is determined based on the imaging performance parameters, including: determining the imaging depth of the ultrasonic imaging device; determining the imaging time of a single scanning line of the ultrasonic imaging device based on the imaging depth; determining the scanning line density of the ultrasonic wave corresponding to the desired lateral resolution based on the desired lateral resolution and the focal length of the transducer; and determining the imaging frame rate corresponding to the desired lateral resolution based on the scanning line density and the imaging time.

[0017] Exemplarily, the first ratio interval and the second ratio interval are both intervals [1, 2].

[0018] According to another aspect of the present invention, a method for determining parameters of an ultrasonic imaging device is also provided, and the method for determining parameters of an ultrasonic imaging device comprises:

[0019] Determining the expected axial resolution, expected lateral resolution, and expected pullback resolution of the ultrasound imaging device for ultrasound pullback imaging;

[0020] Determining imaging performance parameters of a transducer in an ultrasonic imaging device according to a desired axial resolution, a desired lateral resolution, and a desired retraction resolution;

[0021] Determining a target imaging frame rate for ultrasonic pullback imaging by the ultrasonic imaging device according to the imaging performance parameters and the expected lateral resolution;

[0022] Determining a target frame spacing for ultrasonic pullback imaging by an ultrasonic imaging device according to a desired pullback resolution;

[0023] A target retraction speed of the ultrasonic imaging device for performing ultrasonic retraction imaging is determined according to the target frame spacing and the target imaging frame rate.

[0024] Exemplarily, determining the expected axial resolution, expected lateral resolution, and expected pullback resolution of an ultrasonic imaging device for ultrasonic pullback imaging includes: acquiring a parameter set of a target tissue to be subjected to ultrasonic pullback imaging, wherein the parameter set includes a tissue structure size; and determining the expected axial resolution, expected lateral resolution, and expected pullback resolution of the ultrasonic imaging device for ultrasonic pullback imaging based on the tissue structure size in the parameter set of the target tissue.

[0025] Exemplarily, the imaging performance parameters include a center frequency, a focal length, and the size of an emitting surface, the emitting surface of the transducer is rectangular, and the size of the emitting surface includes the length and width of the emitting surface; the imaging performance parameters of the transducer in the ultrasonic imaging device are determined according to the desired axial resolution, the desired lateral resolution, and the desired pullback resolution, including: determining the center frequency of the transducer according to the desired axial resolution; determining the width of the emitting surface of the transducer according to the desired lateral resolution; determining the length of the emitting surface of the transducer according to the desired pullback resolution; and determining the focal length of the transducer according to the center frequency of the transducer and the width or length of the emitting surface.

[0026] Exemplarily, determining the focal length of the transducer according to the center frequency of the transducer and the width or length of the emitting surface includes: determining the wavelength of the ultrasonic wave emitted by the transducer according to the center frequency; determining the focal length according to the width or length of the emitting surface and the wavelength.

[0027] Exemplarily, the ratio of the imaging frame rate corresponding to the desired lateral resolution to the target imaging frame rate is within a first ratio interval; and the ratio of the desired pullback resolution to the target frame spacing is within a second ratio interval.

[0028] Exemplarily, a target imaging frame rate for ultrasonic pullback imaging performed by an ultrasonic imaging device is determined based on imaging performance parameters and desired lateral resolution, including: determining an imaging frame rate corresponding to the desired lateral resolution based on the imaging performance parameters; and determining a target imaging frame rate based on the imaging frame rate corresponding to the desired lateral resolution.

[0029] Exemplarily, the imaging frame rate corresponding to the desired lateral resolution is determined based on the imaging performance parameters, including: determining the imaging depth of the ultrasonic imaging device; determining the imaging time of a single scanning line of the ultrasonic imaging device based on the imaging depth; determining the scanning line density of the ultrasonic wave corresponding to the desired lateral resolution based on the desired lateral resolution and the focal length of the transducer; and determining the imaging frame rate corresponding to the desired lateral resolution based on the scanning line density and the imaging time.

[0030] Exemplarily, the first ratio interval and the second ratio interval are both intervals [1, 2].

[0031] According to another aspect of the present invention, an ultrasonic imaging device is provided. The ultrasonic imaging device comprises: a catheter, a catheter controller and a host computer, wherein a transducer is fixedly arranged in the catheter, and the transducer is used to transmit and receive ultrasonic waves; the host computer is used to determine the target imaging frame rate and the target withdrawal speed of the ultrasonic imaging device based on the parameter determination method of the ultrasonic imaging device as described above, and control the catheter controller to drive the catheter to drive the transducer to withdraw and rotate, so that the ultrasonic imaging device performs ultrasonic imaging at the target withdrawal speed and the target imaging frame rate.

[0032] Exemplarily, the transducer is made of ceramic, ceramic composite material, piezoelectric single crystal or piezoelectric single crystal composite material.

[0033] Exemplarily, the catheter controller includes a digital-to-analog converter and a processor, wherein the digital-to-analog converter is connected between the processor and the transducer and is used to convert an analog signal from the transducer into a digital signal; the processor is used to generate an ultrasound image based on the digital signal; wherein the sampling rate of the digital-to-analog converter is 3 to 5 times the center frequency of the transducer.

[0034] Exemplarily, the catheter controller and the host computer communicate with each other using a high-speed serial computer expansion bus interface or a gigabit network interface.

[0035] According to another aspect of the present invention, an electronic device for an ultrasonic imaging device is also provided. The electronic device for an ultrasonic imaging device comprises: a processor and a memory, wherein computer program instructions are stored in the memory, and when the computer program instructions are executed by the processor, the method for determining parameters of the ultrasonic imaging device as described above is executed.

[0036] According to another aspect of the present invention, a storage medium is provided, on which program instructions are stored. When the program instructions are run, they are used to execute the parameter determination method of the ultrasonic imaging device as described above.

[0037] According to another aspect of the present invention, a computer program product is also provided, comprising computer program instructions, which are used to execute the parameter determination method of the ultrasonic imaging device as described above when the computer program instructions are run.

[0038] The above technical solution determines the expected axial resolution, expected lateral resolution and expected retraction resolution of the ultrasonic imaging device, and then determines the performance parameters of the transducer based on the above expected axial resolution, expected lateral resolution and expected retraction resolution, and then determines the target imaging frame rate and target retraction speed. Because the target imaging frame rate and target retraction speed are determined by reverse deduction based on the expected axial resolution, expected lateral resolution and expected retraction resolution, the former two can ensure that the above three expected resolutions can be achieved during the ultrasonic retraction imaging of the ultrasonic imaging device, thereby ensuring that the ultrasonic imaging device can fully scan the target tissue and achieve high-resolution and high-performance imaging; and the ultrasonic imaging device performs a relatively fast retraction during the ultrasonic retraction imaging process, thereby improving the inspection efficiency, achieving high-time imaging, and reducing the negative impact of the cardiac cycle on ultrasonic imaging, thereby ensuring the imaging quality. At the same time, for ultrasonic imaging during surgery, a higher inspection speed can improve surgical efficiency and reduce the risk to the subject. It can be seen that the technical solution can achieve high-performance and high-time imaging.

[0039] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and other purposes, features and advantages of the present invention will become more apparent by describing the embodiments of the present invention in more detail in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention.

[0041] Figure 1 A schematic flow chart of a method for determining parameters of an ultrasonic imaging device according to an embodiment of the present invention is shown;

[0042] Figure 2 A schematic diagram showing the axial resolution, lateral resolution and pullback resolution of an ultrasonic imaging device according to an embodiment of the present invention;

[0043] Figure 3 A schematic flow chart of a method for determining parameters of an ultrasonic imaging device according to another embodiment of the present invention is shown;

[0044] Figure 4A schematic diagram showing the relationship between the imaging quality and the imaging speed of an ultrasonic imaging device according to an embodiment of the present invention;

[0045] Figure 5 A schematic block diagram of an electronic device for an ultrasonic imaging device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0046] With the development of ultrasonic imaging technology, it can be applied to various scenarios, but there are still some aspects that are difficult to meet the needs.

[0047] For ultrasonic imaging examination, an ultrasonic imaging device is used. The ultrasonic imaging device may include a catheter controller, a catheter and an imaging host. The catheter controller is used to control the rotation and retraction of the catheter, etc. A transducer is provided on the catheter for emitting ultrasonic waves and receiving ultrasonic echoes. The catheter controller can be connected to the imaging host. The imaging host is used for image processing and display control. Usually, the catheter is first controlled to enter the target tissue of the organism, such as the lumen of the blood vessels, digestive tract, respiratory tract, etc., and then the catheter is controlled to be retracted and ultrasonic imaging is performed while retracting. In related technologies, the retraction speed of the ultrasonic catheter is slow, resulting in a longer inspection time, and long-term inspections are easily affected by organ movement, etc., resulting in lower accuracy of ultrasonic images and poor experience for the subjects.

[0048] The following is an example of the target tissue being a blood vessel to elaborate on this issue. Intravascular ultrasound (IVUS) imaging can detect early coronary artery lesions and determine the nature of the lesions. Intravascular ultrasound imaging refers to a medical imaging technology that combines non-invasive ultrasound technology with invasive catheter technology, using a special catheter with an ultrasound transducer connected to the end. However, in related technologies, the retraction speed of the ultrasound catheter is low, resulting in a long inspection time. In one inspection, the blood vessel may contract and relax for multiple cardiac cycles, and the position of the ultrasound catheter will beat with the cardiac cycle, affecting the imaging accuracy and quality. For example, a long-axis ultrasound image may have a sawtooth motion artifact. In addition, adjacent frames of an intravascular ultrasound image may be in different cardiac states, which will have a negative impact on the measurement accuracy of the morphological size of the blood vessel. In addition, intravascular ultrasound imaging can be used for assistance and guidance in surgery, but the retraction speed of the catheter is low and the inspection time is long, which will reduce the efficiency of the operation and increase the risk of the subject.

[0049] In order to at least partially solve the above technical problems, according to one aspect of the present invention, a parameter determination method for an ultrasonic imaging device is provided. Using this parameter determination method, the user can first determine the expected axial resolution, expected lateral resolution, and expected retraction resolution of the ultrasonic imaging device for ultrasonic retraction imaging based on the needs of the current application scenario, and then reverse the parameters of the ultrasonic imaging device based on these expected resolutions (a general term for expected axial resolution, expected lateral resolution, and expected retraction resolution). When the ultrasonic imaging device performs ultrasonic retraction imaging with the determined parameters, it can achieve the above-mentioned expected resolution. As a result, not only can full coverage of the target tissue space scan be guaranteed, thereby ensuring image integrity, but also ultrasonic imaging can be completed at a higher catheter retraction speed, achieving high-performance and high-timeliness imaging.

[0050] In order to make the purpose, technical solution and advantages of the present invention more obvious, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention.

[0051] Figure 1 FIG. 4 is a schematic flow chart showing a method for determining parameters of an ultrasonic imaging device according to an embodiment of the present invention. Figure 1 As shown, the parameter determination method of the ultrasonic imaging device includes the following steps S110, S120, S130, S140 and S150.

[0052] In step S110, the expected axial resolution, expected lateral resolution and expected pullback resolution of the ultrasonic imaging device for performing ultrasonic pullback imaging are determined.

[0053] As mentioned above, the ultrasonic imaging device may include a catheter controller and a catheter. Furthermore, a transducer may be fixedly arranged in the catheter. The transducer is an important component of the ultrasonic imaging device. During the ultrasonic scanning process, the transducer first transmits ultrasonic waves to the target tissue structure in the human body, and then receives the echo of the ultrasonic wave reflected by the target tissue structure, thereby completing the conversion of electrical signals to acoustic signals and acoustic signals to electrical signals. Therefore, the performance of the transducer is directly related to the imaging performance of the ultrasonic imaging device. Among them, the target tissue is the tissue that needs to be imaged by pullback, and specifically can be a lumen such as a blood vessel, a digestive tract, or a respiratory tract. In some embodiments, the target tissue may also be a tissue, a lesion, or an implant inside or outside the lumen, such as a vascular calcification, a stent, etc.

[0054] The imaging resolution of the ultrasound imaging device is the spatial resolution in at least one direction that affects the quality of ultrasound pullback imaging, and may include axial resolution, lateral resolution, and pullback resolution. Figure 2FIG. 1 is a schematic diagram showing the axial resolution, lateral resolution and retraction resolution of an ultrasonic imaging device according to an embodiment of the present invention. Figure 2 To describe, axial resolution, lateral resolution and retraction resolution are respectively represented by different directions of transducer scanning, and are used to characterize the ability to distinguish the two closest target positions of the target tissue to be subjected to ultrasonic retraction imaging in the corresponding direction. Axial resolution represents the ability to distinguish the two closest target positions of the target tissue in the direction of the acoustic beam axis (i.e., the ultrasonic wave propagation direction), that is, the ability to identify the two closest points in the direction of the acoustic beam axis. Axial resolution directly affects the recognition of fine structures in the depth direction of the target tissue. During ultrasonic scanning, the ultrasonic catheter is retracted along the lumen, and the direction parallel to the lumen at the location of the transducer in the ultrasonic catheter is the retraction direction. Retraction resolution represents the ability to distinguish the two closest target positions of the target tissue in the retraction direction. Retraction resolution depends on the imaging frame rate and the retraction speed. The lateral resolution represents the ability to distinguish the two closest target positions of the target tissue in the direction perpendicular to the retraction direction and the ultrasonic wave propagation direction. In other words, lateral resolution can characterize the ability to distinguish the two closest target positions of the target tissue in the rotation direction.

[0055] The above-mentioned expected axial resolution, expected lateral resolution and expected retraction resolution are the resolutions in different directions that the user expects the ultrasonic imaging device to achieve when performing ultrasonic retraction imaging. The expected resolution may be the minimum value expected to be achieved, and in specific calculations, the parameters of the ultrasonic imaging device may be determined according to the resolution greater than these expected resolutions.

[0056] It can be understood that the expected axial resolution, the expected lateral resolution, and the expected retraction resolution can be determined according to clinical needs. The clinical needs can be determined based on the local size of the lumen to be imaged, and then the expected axial resolution, the expected lateral resolution, and the expected retraction resolution of the ultrasound imaging device can be comprehensively determined. Further, the lateral resolution and the retraction resolution of the ultrasound imaging device are directly affected by the size of the emitting surface of the transducer of the ultrasound imaging device. Therefore, the user can select an adapted catheter from a plurality of catheters supported by the ultrasound imaging device that are provided with different transducers. At this time, the resolution supported by the ultrasound imaging device can be used as the expected lateral resolution and the expected retraction resolution. For an intravascular ultrasound imaging device, the expected axial resolution can be any value between 50 microns and 100 microns, the expected lateral resolution can be any value between 50 microns and 200 microns, and the expected retraction resolution can be any value between 50 microns and 200 microns. Specifically, the expected axial resolution can be 50 microns, the expected lateral resolution can be 100 microns, and the expected retraction resolution can be 100 microns.

[0057] In step S120, imaging performance parameters of a transducer in the ultrasonic imaging device are determined according to the desired axial resolution.

[0058] The imaging performance parameters of the transducer may include the center frequency, bandwidth, focal length, etc. of the transducer. These imaging performance parameters are crucial to the performance of the ultrasonic imaging device, and they directly affect the axial resolution of ultrasonic imaging. Therefore, these imaging performance parameters can be reversely derived based on the above-mentioned expected axial resolution. Among them, the center frequency of the transducer refers to the frequency component in which the energy of the ultrasonic signal is most concentrated. The bandwidth of the transducer refers to the frequency range in which it can work effectively, specifically, the frequency range in which the transducer can generate and receive ultrasonic signals. As for the bandwidth, the larger the bandwidth, the wider the frequency range in which the transducer can work. It can be understood that the bandwidth and center frequency of the transducer can affect its axial resolution. The larger the bandwidth of the transducer, the smaller the axial resolution. The larger the center frequency of the transducer, the greater the axial resolution. Therefore, the center frequency and bandwidth in the performance parameters of the transducer can be reversely determined based on the expected axial resolution.

[0059] The ultrasonic beam is concentrated to the smallest size at a specific distance from the transducer, and this point or area can be called the focus. The target tissue located near the focus can have a higher imaging resolution. The distance from the transducer to the center of the focus is the focal length. That is, the focal length of the transducer refers to the distance between the point or a certain area where the ultrasonic beam emitted by the transducer is focused and the transducer itself. The focal length of the transducer is affected by the wavelength of the ultrasonic wave. The wavelength of the ultrasonic wave is related to the above-mentioned center frequency. Therefore, the focal length in the imaging performance parameters of the transducer can be determined according to the desired axial resolution.

[0060] In step S130, a target imaging frame rate for ultrasonic pullback imaging performed by the ultrasonic imaging apparatus is determined according to the imaging performance parameters and the expected lateral resolution.

[0061] The imaging frame rate refers to the number of times a complete image is acquired and reconstructed per second, which can indicate the speed at which an ultrasonic imaging device generates a complete image. In the embodiment of the present invention, the imaging frame rate may be referred to as the frame rate. In intravascular ultrasound imaging, the transducer scans the blood vessel by rotating and retracting. The frame rate is related to the rotation speed of the transducer, the signal, and the image processing time. The frame rate affects whether the transducer can scan and cover the entire circumference of the blood vessel. At a specific retraction speed, if the frame rate is too high, the transducer cannot scan and cover the entire circumference of the blood vessel during the rotation process, resulting in information loss; if the frame rate is too low, there is redundant information between the two frames of images, which will affect the efficiency of the operation. As mentioned above, the lateral resolution indicates the ability to distinguish the two closest target positions in the lateral direction. Therefore, different frame rates correspond to different lateral resolutions. As mentioned above, the coverage range of ultrasound is the smallest at the focal length. Therefore, if the imaging frame rate corresponding to the desired lateral resolution can scan and cover the entire circumference of the blood vessel at the focal length, it can be ensured that the blood vessel can be scanned and covered regardless of whether it is located farther or closer. Therefore, the target imaging frame rate can be determined by the focal length and the expected lateral resolution in the performance parameters of the transducer. The target imaging frame rate is less than or equal to the imaging frame rate corresponding to the expected lateral resolution.

[0062] In step S140, a target frame spacing for ultrasonic pullback imaging performed by the ultrasonic imaging apparatus is determined according to the desired pullback resolution.

[0063] During the ultrasonic pullback imaging process, the catheter of the ultrasonic imaging device moves from one end of the target tissue to the other end and rotates continuously during the movement, thereby collecting continuous intraluminal cross-sectional images of the target tissue. There is a certain spacing between these adjacent cross-sectional images. The frame spacing can be the distance between the center of a frame of ultrasound image (cross-sectional image) and the center of the next frame of ultrasound image (cross-sectional image). It can be understood that if the frame spacing is greater than the pullback resolution, there is a missed area between the two frames of ultrasound images. In other words, if the frame spacing is greater than the pullback resolution, the ultrasound scan coverage of the target tissue is incomplete. Therefore, the target frame spacing of the ultrasonic imaging device can be determined according to the expected pullback resolution. According to an embodiment of the present invention, the target frame spacing is less than or equal to the expected pullback resolution. It can be understood that if the target frame spacing is less than the expected pullback resolution, there is a repeated area between the two frames of ultrasound images.

[0064] In step S150, a target retraction speed of the ultrasonic imaging device for performing ultrasonic retraction imaging is determined according to the target frame spacing and the target imaging frame rate.

[0065] Exemplarily, the ultrasonic imaging device realizes the scanning of the lumen by rotating and retracting the transducer. It can be understood that the retraction speed is the speed at which the transducer is retracted along the lumen. Assuming that the scanning distance is the same, the faster the retraction speed, the shorter the corresponding scanning time, and the less the scanning process is affected by the cardiac cycle. Therefore, it is expected to perform imaging at a faster retraction speed. Further, the retraction speed is related to the distance and time, while the frame spacing affects the distance and the frame rate affects the time, so the retraction speed is related to the frame spacing and the frame rate. The target retraction speed can be determined jointly according to the target frame spacing and the target imaging frame rate. It can be understood that since the retraction speed is affected by the frame rate and the frame spacing, the same frame rate and different frame spacings can correspond to different retraction speeds. The same frame spacing and different frame rates can also correspond to different retraction speeds.

[0066] In the above embodiment where the expected axial resolution of intravascular ultrasound imaging is 50 microns, the expected lateral resolution is 100 microns, and the expected retraction resolution is 100 microns, the determined target imaging frame rate is less than 2450 frames per second (fps), the target frame spacing is less than 0.1 mm, and the target retraction speed is less than 245 mm / second.

[0067] Table 1 shows multiple parameter groups within the range of target imaging frame rate, target frame spacing and target retraction speed of the ultrasonic imaging device when the scanning length is 100 mm. As shown in the last row of data in Table 1 below, the target imaging frame rate is 2450 frames / second (fps), the target frame spacing is 0.1 mm, and the target retraction speed is 245 mm / second. For a scanning length of 100 mm, the retraction time is 0.4 seconds. The average cardiac cycle of the human body is 0.8 seconds / time, that is, the retraction time is about half the time of the cardiac cycle. Under the same scanning length, the smaller the frame rate and the lower the retraction speed, the more corresponding cardiac cycles, the greater the degree of influence of the cardiac cycle on the ultrasonic image, and therefore the worse the quality of the ultrasonic image. According to the ultrasonic imaging device of the above embodiment, ultrasonic imaging can be performed at a higher frame rate and retraction speed, and the blood vessels of the scanning length can be scanned within about half a cardiac cycle under the premise of ensuring that the blood vessels of the scanning length are fully scanned and covered, so that the negative impact of the cardiac cycle on the imaging quality is very small.

[0068]

[0069] In practical applications, the number of cardiac cycles corresponding to the time required to scan a fixed length of blood vessel can be determined. Then, a set of parameters with high performance and high timeliness can be selected based on the number of cardiac cycles, such as the parameters in the bottom 3 rows of data in Table 1 above. The withdrawal speed determined according to the embodiment of the present invention is hundreds of times higher than the traditional withdrawal speed of 0.5 mm / s or 1 mm / s, which is of great significance for practical clinical applications, so that intravascular ultrasound examination can be completed in a very short time, greatly reducing the influence of the cardiac cycle on ultrasound imaging, and achieving a more ideal ultrasound imaging effect.

[0070] The above technical solution determines the expected axial resolution, expected lateral resolution and expected withdrawal resolution of the ultrasonic imaging device, and then determines the performance parameters of the transducer based on the above expected axial resolution, expected lateral resolution and expected withdrawal resolution, and then determines the target imaging frame rate and target withdrawal speed. Because the target imaging frame rate and target withdrawal speed are determined by inverse deduction based on the expected axial resolution, expected lateral resolution and expected withdrawal resolution, the former two can ensure that the above three expected resolutions can be achieved during the ultrasonic withdrawal imaging of the ultrasonic imaging device, and high-resolution and high-performance imaging can be achieved, thereby ensuring that the ultrasonic imaging device can fully scan the target tissue; and, under the premise of ensuring a comprehensive scan, the catheter of the ultrasonic imaging device can be withdrawn more quickly during the ultrasonic withdrawal imaging process, thereby improving the inspection efficiency, achieving high-time imaging, and reducing the negative impact of the cardiac cycle on ultrasonic imaging, ensuring the imaging quality. At the same time, for ultrasonic imaging during surgery, a higher inspection speed can improve surgical efficiency and reduce the risk of the subject. It can be seen that this technical solution can achieve high-performance and high-time imaging.

[0071] Exemplarily, step S110 in the parameter determination method of the ultrasonic imaging device may further include steps S111 and S112.

[0072] In step S111 , a parameter set of a target tissue to be subjected to ultrasonic pullback imaging is acquired, wherein the parameter set includes a tissue structure size.

[0073] Before testing the subject, the parameter set of the target tissue can be collected through other testing methods according to clinical needs. The parameter set includes tissue structure size. Different target tissues can have different parameter sets of target tissues. Different disease types can also have different clinical needs. Therefore, different disease types can correspond to different parameter sets of the same target tissue. Taking the clinical needs of coronary heart disease in intravascular ultrasound imaging as an example, the parameters in the parameter set of the target tissue may include tissue structure sizes such as coronary artery vessel size and stenosis area size in the coronary artery. Furthermore, the parameter set may also include the size of tissues, lesions or implants related to the target tissue. For example, the size of medical devices in the coronary artery, such as stent trabeculae size, etc. It can be understood that the parameter set of the target tissue can be collected based on the summary of the doctor's clinical needs, and the target tissue parameter set can be a data set.

[0074] Step S112, determining the expected axial resolution, expected lateral resolution and expected pullback resolution of the ultrasonic pullback imaging device according to the tissue structure size in the parameter set of the target tissue.

[0075] The expected resolution is determined based on the size of the tissue structure, with the aim of making the determined expected axial resolution, expected lateral resolution and expected withdrawal resolution able to distinguish the size of the tissue structure. Therefore, the expected axial resolution, expected lateral resolution and expected withdrawal resolution should be less than or equal to the size of the tissue structure in the corresponding direction.

[0076] Exemplarily, the parameter set of the target tissue is a data set of numerous data including parameters such as coronary artery vessel size, stent trabeculae size, and in-stent restenosis area size. Specifically, the resolution for the in-stent restenosis area size can be determined based on its minimum size to ensure that the smallest restenosis area can also be detected. Similarly, for other parameters in the parameter set of the target tissue, the resolution can also be determined based on its maximum or minimum size parameters. In other words, different expected resolutions of the ultrasound imaging device can be determined for parameter sets of different target tissues. Furthermore, based on the parameter set of the target tissue, the expected axial resolution, expected lateral resolution, and expected pullback resolution of the ultrasound imaging device can be determined through existing or future developed technologies such as mathematical modeling, data analysis, and machine learning.

[0077] Exemplarily, based on the thickness of the fibrous cap of the vulnerable plaque being less than or equal to 65 microns, the expected axial resolution is determined to be less than or equal to 65 microns; based on the stent trabeculae size being approximately 60 microns, the expected lateral resolution and the expected pullback resolution are determined to be both less than or equal to 60 microns.

[0078] The above technical solution determines the expected axial resolution, expected lateral resolution and expected retraction resolution of the ultrasonic imaging device according to the target tissue parameter set. The ultrasonic imaging device can determine the resolution specifically for different tissues and different diseases to improve the accuracy of the examination.

[0079] Alternatively, step S110 in the parameter determination method of the ultrasonic imaging device may also include receiving the desired axial resolution, desired lateral resolution, and desired retraction resolution of the ultrasonic imaging device set by the user. For example, the user may manually input the desired axial resolution, desired lateral resolution, and desired retraction resolution based on experience. Thus, the ultrasonic imaging device may meet the customized needs of the staff.

[0080] Exemplarily, the parameter determination method of the ultrasonic imaging device also includes step S115, obtaining the size of the emitting surface of the transducer of the ultrasonic imaging device. The emitting surface of the transducer refers to the surface of the transducer responsible for emitting and receiving ultrasonic waves. The transducer converts electrical signals into mechanical vibrations based on the inverse piezoelectric effect of the material. In the process of emitting sound waves, the electrical oscillation signal sent from the excitation power supply will cause the change of the electric field in the electrical energy storage element in the transducer. This change generates a driving force on the emitting surface of the transducer through a certain effect, causing it to enter a vibrating state and radiate sound waves into the medium. The process of receiving sound waves is exactly the opposite of the previous process. The external sound wave acts on the emitting surface of the transducer, causing it to vibrate, and with the help of the piezoelectric effect, the electrical output end of the transducer generates a voltage in response to the sound signal. It can be understood that the size of the emitting surface is related to the shape of the emitting surface of the transducer. If the emitting surface of the transducer is rectangular, the size parameters of the emitting surface may include its length and width. If the emitting surface of the transducer is circular, its size parameters may be the diameter. The desired lateral resolution and the desired withdrawal resolution are determined by the size of the emitting surface of the transducer. Therefore, after the desired lateral resolution and the desired retracement resolution are determined in step S110, an ultrasound imaging device provided with an adapted catheter having a transducer supporting the desired lateral resolution and the desired retracement resolution may be selected for execution. The size of the emitting surface of the transducer of the ultrasound imaging device may be obtained.

[0081] Exemplarily, the imaging performance parameters of the transducer include center frequency and focal length.

[0082] In step S120, the imaging performance parameters are determined not only according to the desired axial resolution, but also according to the size of the emitting surface of the transducer. The above step S120 may specifically include step S121 and step S122. The center frequency and focal length of the transducer may be determined respectively through step S121 and step S122.

[0083] In step S121, the center frequency of the transducer is determined according to the desired axial resolution.

[0084] For example, the bandwidth of the transducer may be inversely proportional to the desired axial resolution, and the bandwidth of the transducer may be calculated by the following formula:

[0085]

[0086] Wherein, BW represents the bandwidth of the transducer, RA represents the desired axial resolution, and c represents the ultrasonic velocity. In the embodiment of the present invention, c can be the average value of the ultrasonic propagation velocity in human tissue, 1540 meters per second.

[0087] The ratio of the bandwidth of the transducer to the center frequency of the transducer is the bandwidth percentage. The center frequency of the ultrasonic transducer can be reversely calculated based on the required bandwidth percentage.

[0088]

[0089] Wherein, BW is the bandwidth of the transducer and FC is the center frequency of the transducer.

[0090] Furthermore, the bandwidth of the transducer is divided by the bandwidth percentage to obtain the center frequency of the transducer.

[0091] In a specific embodiment of the present invention, the desired axial resolution may be 50 microns, so based on the above formula, the bandwidth of the transducer may be calculated to be 15.4 MHz. The bandwidth percentage may be 40%, so the center frequency of the transducer may be 38.5 MHz.

[0092] In step S122, the focal length of the transducer is determined according to the center frequency of the transducer and the size of the emitting surface.

[0093] The focal length of the transducer is related to the central frequency of the transducer and the size of the emitting surface. The emitting surface can be rectangular, and the size of the emitting surface includes its width and length.

[0094] In this step S122, the focal length of the transducer can be determined according to the center frequency of the transducer and the width of its emitting surface. Alternatively, the focal length of the transducer can also be determined according to the center frequency of the transducer and the length of its emitting surface.

[0095] For example, taking width as an example, the focal length can be calculated according to the following formula:

[0096]

[0097] Wherein, F0 represents the focal length of the transducer, RL represents the desired lateral resolution, W represents the width of the emitting surface of the transducer, FC represents the center frequency of the transducer, and c represents the ultrasonic sound velocity. In the embodiment of the present invention, c can be taken as the average value of the ultrasonic propagation velocity in human tissue, 1540 m / s.

[0098] Still taking the above transducer with a center frequency of 38.5 MHz, an expected lateral resolution of 100 microns, and a width of the emitting surface of 400 microns as an example, it can be calculated that the focal length of the transducer is 1000 microns.

[0099] The length and width of the emitting surface may be equal, and correspondingly, its expected lateral resolution and expected retraction resolution may also be equal, so the focal length of the transducer calculated by the expected retraction resolution and the length of the emitting surface may also be 1000 microns.

[0100] The above technical solution determines the central frequency and focal length of the transducer by the expected axial resolution, the expected lateral resolution or the expected withdrawal resolution. The performance parameters of the transducer better meet the requirements of the expected resolution, thereby improving the imaging effect of the ultrasonic imaging device.

[0101] Exemplarily, the above step S122 further includes step S122a and step S122b.

[0102] In step S122a, the wavelength of the ultrasonic wave emitted by the transducer is determined according to the center frequency.

[0103] Exemplarily, the center frequency is inversely proportional to the wavelength of the ultrasonic wave emitted by the ultrasonic transducer. The relationship between the above parameters can be expressed by the following formula:

[0104]

[0105] in, represents the wavelength of the ultrasonic wave emitted by the transducer, c represents the ultrasonic wave speed, and FC represents the center frequency of the transducer. In the embodiment of the present invention, c can be the average value of the ultrasonic wave propagation speed in human tissue, 1540 m / s.

[0106] Still taking the central frequency of the above transducer as 38.5 MHz as an example, the wavelength of the ultrasonic wave emitted by the transducer is 40 microns.

[0107] In step S122b, the focal length is determined according to the size of the emitting surface and the wavelength.

[0108] Exemplarily, the focal length of the transducer can be calculated based on the wavelength of the ultrasonic wave emitted by the transducer and the length or width of the emitting surface of the transducer. Specifically, it can be calculated according to the following formula:

[0109]

[0110] Where F0 represents the focal length of the transducer, W represents the width of the emitting surface of the transducer, and RL represents the desired lateral resolution. Indicates the wavelength of the ultrasonic wave emitted by the transducer.

[0111] Specifically, still taking the wavelength of the ultrasonic wave emitted by the above transducer as 40 microns, the expected lateral resolution of the transducer as 100 microns, and the width of the emitting surface of the transducer as 400 microns as an example. It can be calculated that the focal length of the transducer is 1000 microns. The length and width of the emitting surface can be equal, and correspondingly, its expected lateral resolution and expected withdrawal resolution can also be equal, so the focal length of the transducer calculated by the expected withdrawal resolution and the length of the emitting surface can also be 1000 microns.

[0112] In the above technical solution, the wavelength of the ultrasound wave is determined by the central frequency of the transducer, and then the focal length of the transducer is determined based on the wavelength of the ultrasound wave and the width or length of the emitting surface. The determined focal length is more accurate, ensuring the imaging quality of the ultrasound imaging device.

[0113] Exemplarily, in the parameter determination method of the ultrasonic imaging device as described above, the ratio of the imaging frame rate corresponding to the desired lateral resolution to the target imaging frame rate is within a first ratio interval.

[0114] If the imaging frame rate corresponding to the expected lateral resolution can ensure full scanning coverage within the target tissue cavity at the focal length of the transducer, it can be ensured that the target position can be scanned and covered regardless of whether it is farther or closer. Therefore, the target imaging frame rate can be determined by the expected lateral resolution and the focal length in the performance parameters of the transducer. The target imaging frame rate can be less than or equal to the imaging frame rate corresponding to the expected lateral resolution, thus ensuring a comprehensive scan. According to an embodiment of the present invention, the ratio of the imaging frame rate corresponding to the expected lateral resolution to the target imaging frame rate is within a first ratio interval. Exemplarily, the first ratio interval can be [1,5].

[0115] Exemplarily, the ratio of the expected pullback resolution to the target frame spacing is within a second ratio interval.

[0116] If the frame spacing is greater than the pullback resolution, there is a missed detection area between the two frames of ultrasound images. If the frame spacing is less than the expected pullback resolution, there is a repeated area between the two frames of ultrasound images. For ultrasound imaging, repeated areas within a certain range are acceptable. According to an embodiment of the present invention, the ratio of the expected pullback resolution to the target frame spacing is within a second ratio interval. Exemplarily, the second ratio interval can be [1,5].

[0117] The above technical solution can select appropriate target imaging frame rate and target frame spacing within a reasonable range while ensuring a comprehensive scan of the target tissue, thereby achieving better imaging effects, meeting user customization requirements, and improving user satisfaction.

[0118] Exemplarily, the ratio of the imaging frame rate corresponding to the desired lateral resolution to the target imaging frame rate is within the interval [1,2]. That is, the above-mentioned first ratio interval is the interval [1,2]. In other words, the target imaging frame rate can be one-half to one times the imaging frame rate corresponding to the desired lateral resolution. It can be understood that if the target imaging frame rate is too small relative to the imaging frame rate corresponding to the desired lateral resolution, there will be a large area of ​​repeated detection in the lateral direction, affecting the inspection speed; conversely, there will be an area of ​​missed detection in the lateral direction. Therefore, the target imaging frame rate can be one-half to one times the imaging frame rate corresponding to the desired lateral resolution, which can ensure that there is no missed detection in the lateral direction and the inspection speed. As mentioned above, when the target imaging frame rate is equal to the imaging frame rate corresponding to the desired lateral resolution, missed detection will not occur.

[0119] Similarly, the ratio of the expected retracement resolution to the target frame spacing is also within the interval [1,2], that is, the second ratio interval is the interval [1,2], and the target frame spacing can be half to one times the expected retracement resolution, which can ensure that there is no missed inspection area in the retracement direction and ensure the inspection speed.

[0120] In other examples of the present invention, in order to avoid the influence of system errors on imaging quality, the target imaging frame rate is slightly smaller than the imaging frame rate corresponding to the expected lateral resolution, but not equal to the latter. Thus, the target imaging frame rate has a certain margin to ensure that there is no missed detection. Similarly, the target frame spacing is slightly smaller than the expected retracement resolution, but not equal to the latter.

[0121] The above technical solution ensures that the expected axial resolution, expected lateral resolution, expected retraction resolution and related imaging performance parameters of the transducer, including the center frequency and focal length, are not redundant by determining the target imaging frame rate and target frame spacing within a certain range, thereby optimizing many parameters and ensuring both high performance and high timeliness. It ensures that there are no missed inspection areas, avoids large areas of repeated inspection, and improves the inspection speed.

[0122] Exemplarily, the above step S130 includes step S131 and step S132.

[0123] In step S131, the imaging frame rate corresponding to the desired lateral resolution is determined according to the performance parameters.

[0124] The lateral resolution is expected to have a specific value. According to the specific value of the expected lateral resolution, a maximum frame rate can be determined so that when an ultrasonic imaging device with specific performance parameters performs ultrasonic imaging at the frame rate, the lateral resolution of the ultrasonic imaging device has the specific value. The maximum frame rate is the imaging frame rate corresponding to the expected lateral resolution. When ultrasonic imaging is performed at a rate higher than the frame rate, the lateral scanning capability of the ultrasonic imaging device becomes weaker, resulting in some areas in the target tissue being missed. When ultrasonic imaging is performed at a rate lower than the frame rate, the same target area may exist between each image frame. In other words, there are repeated areas in different image frames, especially in adjacent image frames.

[0125] The performance parameters of the transducer determine the corresponding relationship between the lateral resolution and the frame rate. In this step S131, the imaging frame rate corresponding to the desired lateral resolution can be determined based on these performance parameters.

[0126] In step S132, a target imaging frame rate is determined according to the imaging frame rate corresponding to the desired lateral resolution.

[0127] As described above, the imaging frame rate corresponding to the expected lateral resolution is a frame rate that can just ensure that the blood vessels are fully covered by the scan, and there is no missed inspection area or repeated scanning area. In other words, the imaging frame rate that is less than or equal to the imaging frame rate corresponding to the expected lateral resolution can ensure that the blood vessels are fully covered by the scan. Therefore, the target imaging frame rate can be less than or equal to the imaging frame rate corresponding to the expected lateral resolution. However, in order to avoid repeated scanning areas that are too large, the ratio of the imaging frame rate corresponding to the expected lateral resolution to the frame rate in the first ratio interval can be determined as the target imaging frame rate.

[0128] The above technical solution determines the target imaging frame rate through the performance parameters of the transducer. For a specific transducer, it is ensured that the circumference of the blood vessel can be fully covered by the scan without excessive redundant data, thereby improving the accuracy and speed of the inspection.

[0129] Exemplarily, the above-mentioned step S131 of determining the imaging frame rate corresponding to the desired lateral resolution may specifically include step S131a, step S131b, step S131c and step S131d.

[0130] In step S131a, the imaging depth of the ultrasonic imaging device is determined.

[0131] It can be understood that the imaging depth represents the distance from the position of the transducer to the position of the farthest target point that can be clearly imaged. The parameter set of the target tissue can be determined according to clinical needs, and the parameter set includes the size of the tissue structure. The imaging depth of the ultrasound imaging device is then determined based on the parameter set. The imaging depth can be greater than or equal to the size of the tissue structure to ensure full coverage of the target tissue. Taking intravascular ultrasound imaging as an example, the imaging depth can be determined based on the size of the blood vessel. It can be understood that the ultrasound catheter is located in the center of the blood vessel and scans the blood vessel once by rotating. Therefore, the imaging depth of the ultrasound imaging device can be determined based on the radius of the blood vessel to ensure that the imaging depth can fully cover the range of the blood vessel. Specifically, if the radius of the blood vessel is 3 mm, the imaging depth needs to be greater than 3 mm, and the imaging depth of the ultrasound imaging device can be, for example, 5 mm.

[0132] In step S131b, the imaging time of a single scanning line of the ultrasonic imaging device is determined according to the imaging depth.

[0133] The imaging time of a single scan line is related to the propagation speed of ultrasound and the imaging depth. In other words, the imaging time can be the time from when the transducer transmits ultrasound to the deepest imaging depth to when the transducer receives the reflected ultrasound. It can be calculated according to the following formula:

[0134]

[0135] Wherein, TA represents the imaging time, D represents the imaging depth, and c represents the ultrasonic velocity.

[0136] In the above embodiment, the imaging depth of ultrasound can be 5 mm, and the average value of the propagation speed of ultrasound in human tissue is 1540 meters per second, and the imaging time can be calculated to be 6.5 microseconds.

[0137] In step S131c, the scanning line density of the ultrasound wave corresponding to the desired lateral resolution is determined according to the desired lateral resolution and the focal length of the transducer.

[0138] It can be understood that the scanning line density of ultrasound can represent the number of ultrasound scans required to scan a blood vessel. The greater the scanning line density, the more scanning times the transducer will have for one rotation. The ultrasound imaging depth is the smallest at the focal length of the transducer. Therefore, if the scanning line density at the focal length can ensure that the blood vessel is fully scanned, it can ensure that all blood vessels within the imaging depth can be scanned and covered. The scanning line density of ultrasound corresponding to the desired lateral resolution can be calculated according to the following formula:

[0139]

[0140] Wherein, LD represents the scanning line density of the ultrasound wave corresponding to the desired lateral resolution, F0 represents the focal length of the transducer, and RL represents the desired lateral resolution.

[0141] Taking the focal length of the above transducer as 1000 microns and the expected lateral resolution as 100 microns as an example, the scan line density can be calculated to be 63 lines / frame.

[0142] In step S131d, the imaging frame rate corresponding to the desired lateral resolution is determined according to the scanning line density and the imaging time.

[0143] Exemplarily, the imaging frame rate is related to the imaging time and the scanning line density, and can be calculated by the following formula:

[0144]

[0145] Wherein, FR represents the imaging frame rate corresponding to the desired lateral resolution, TA represents the imaging time of a single scanning line of the ultrasonic imaging device, and LD represents the scanning line density of the ultrasonic wave corresponding to the desired lateral resolution.

[0146] Taking the imaging time of a single scan line of the above-mentioned ultrasonic imaging device as 6.5 microseconds and the scan line density of the ultrasonic wave corresponding to the desired lateral resolution as 63 lines / frame as an example, the imaging frame rate corresponding to the desired lateral resolution can be calculated to be 2442 frames / second. It can be understood that the target imaging frame rate can be slightly less than the imaging frame rate corresponding to the desired lateral resolution.

[0147] The above technical solution determines the imaging frame rate corresponding to the expected lateral resolution according to the imaging depth of the ultrasound, the expected lateral resolution and the transducer performance parameters, so as to ensure that the target tissue can be fully scanned and covered and the repeated scanning area is small at the target imaging frame rate determined based on the imaging frame rate corresponding to the expected lateral resolution. This not only ensures the integrity of the ultrasound imaging image, but also ensures the imaging speed.

[0148] Figure 3 FIG. 4 is a schematic flow chart of a method for determining parameters of an ultrasonic imaging device according to another embodiment of the present invention. Figure 3As shown, the parameter determination method of the ultrasonic imaging device includes the following steps S310, S320, S330, S340 and S350. Step S310, determining the expected axial resolution, expected lateral resolution and expected retraction resolution of the ultrasonic imaging device for ultrasonic retraction imaging. Step S320, determining the imaging performance parameters of the transducer in the ultrasonic imaging device according to the expected axial resolution, expected lateral resolution and expected retraction resolution. Step S330, determining the target imaging frame rate of the ultrasonic imaging device for ultrasonic retraction imaging according to the imaging performance parameters and the expected lateral resolution. Step S340, determining the target frame spacing of the ultrasonic imaging device for ultrasonic retraction imaging according to the expected retraction resolution. Step S350, determining the target retraction speed of the ultrasonic imaging device for ultrasonic retraction imaging according to the target frame spacing and the target imaging frame rate. Step S310 , step S330 , step S340 and step S350 are similar to the above-mentioned step S110 , step S130 , step S140 and step S150 , respectively, and the same parts are not repeated here.

[0149] In step S320, the imaging performance parameters of the transducer in the ultrasonic imaging device are determined according to the expected axial resolution, the expected lateral resolution, and the expected withdrawal resolution. In this step S320, the imaging performance parameters of the transducer are comprehensively determined according to the expected resolutions in the three directions, so that more imaging performance parameters of the transducer of the ultrasonic imaging device can be determined.

[0150] For example, the imaging performance parameters of the transducer may include the center frequency, focal length and size of the emitting surface of the transducer. The center frequency and focal length of the transducer have been described in detail above and will not be repeated here. The size of the emitting surface of the transducer is a size parameter representing the imaging area of ​​the transducer, which is related to the size and shape of the emitting surface. The size of the emitting surface of the transducer directly determines the lateral resolution and the pullback resolution, so the size of the emitting surface of the transducer can be inferred based on the target lateral resolution and the target pullback resolution.

[0151] The lateral resolution and retraction resolution of the transducer are affected by the size of the transducer's emitting surface, the focal length, and the wavelength of the ultrasonic wave. The wavelength of the ultrasonic wave is related to the above-mentioned center frequency. Therefore, the focal length in the performance parameters of the transducer can be determined jointly according to the target axial resolution, the target lateral resolution, and the target retraction resolution.

[0152] In the parameter determination method of the above-mentioned ultrasonic imaging device, more performance parameters of the transducer, as well as the target imaging frame rate and the target withdrawal speed are determined by determining the expected axial resolution, expected lateral resolution and expected withdrawal resolution of the ultrasonic imaging device. Therefore, an ultrasonic imaging device can be designed based on the parameter determination method, so that the ultrasonic imaging device with parameters determined based on the parameter determination method can provide a higher withdrawal speed while ensuring a comprehensive scan of the target tissue, thereby improving the inspection efficiency and reducing the negative impact of the cardiac cycle on ultrasonic imaging. At the same time, for ultrasonic imaging during surgery, a higher inspection speed can improve surgical efficiency and reduce the risk to the subject. High-performance and time-effective imaging can be achieved.

[0153] Exemplarily, the above step S310 may include step S311 and step S312. Step S311, obtaining a parameter set of the target tissue to be subjected to ultrasonic pullback imaging, wherein the parameter set includes the size of the tissue structure. Step S312, determining the expected axial resolution, expected lateral resolution, and expected pullback resolution of the ultrasonic imaging device for ultrasonic pullback imaging according to the size of the tissue structure in the parameter set of the target tissue. Step S311 and step S312 are similar to the above steps S111 and S112, respectively, and the same parts are not repeated here, and they also have corresponding technical effects.

[0154] As mentioned above, the imaging performance parameters may include the center frequency, the focal length and the size of the emitting surface. The emitting surface of the transducer may be rectangular, and therefore, the size of the emitting surface includes the length and width of the emitting surface.

[0155] Step S320 may include step S321, step S322, step S323 and step S324. Step S321, determining the center frequency of the transducer according to the desired axial resolution. Step S322, determining the width of the emitting surface of the transducer according to the desired lateral resolution. Step S323, determining the length of the emitting surface of the transducer according to the desired withdrawal resolution. Step S324, determining the focal length of the transducer according to the center frequency of the transducer and the width or length of the emitting surface.

[0156] It can be understood that the center frequency and bandwidth of the transducer, and the width and length of the emitting surface are determined respectively through step S321, step S322 and step S323. Step S321, step S322 and step S323 can be performed in any order. For example, step S323 can be performed before step S322 and step S321. Step S324 is performed after step S321, step S322 and step S323. Step S321 and step S324 are similar to step S121 and step S122 respectively, and the same parts are not repeated here.

[0157] In step S322, the width of the emitting surface of the transducer is determined according to the desired lateral resolution.

[0158] Exemplarily, the width of the emitting surface is related to the desired lateral resolution. The width of the emitting surface may be a fixed multiple of the desired lateral resolution, and this multiple may be a number greater than 2. The width of the emitting surface may be 4 times the desired lateral resolution. In a specific embodiment of the present invention, the desired lateral resolution may be 100 microns, so the width of the emitting surface is 400 microns.

[0159] In step S323, the length of the emitting surface of the transducer is determined according to the desired pullback resolution.

[0160] Exemplarily, similar to the width of the emitting surface of the transducer, the length of the emitting surface is related to the desired pullback resolution. The length of the emitting surface may be a multiple of the desired pullback resolution, and this multiple may be a number greater than 2 to ensure that the desired pullback resolution is achieved. For example, the length of the emitting surface may be 4 times the desired pullback resolution. In a specific embodiment of the present invention, the desired pullback resolution may be 100 microns, so the length of the emitting surface is 400 microns.

[0161] Exemplarily, step S324 includes step S324a and step S324b. Step S324a, determining the wavelength of the ultrasonic wave emitted by the transducer according to the center frequency. Step S324b, determining the focal length according to the width or length of the emission surface and the wavelength. Step S324a and step S324b are similar to step S122a and step S122b, respectively, and the same parts are not repeated here.

[0162] Exemplarily, in the parameter determination method of the above-mentioned ultrasonic imaging device, the ratio of the imaging frame rate corresponding to the expected lateral resolution to the target imaging frame rate is within a first ratio interval; the ratio of the expected pullback resolution to the target frame spacing is within a second ratio interval.

[0163] Exemplarily, the first ratio interval and the second ratio interval are both intervals [1, 2].

[0164] Exemplarily, the above step S330 includes step S331 and step S332. Step S331, determining the imaging frame rate corresponding to the desired lateral resolution according to the imaging performance parameter. Step S332, determining the target imaging frame rate according to the imaging frame rate corresponding to the desired lateral resolution. Step S331 and step S332 are similar to step S131 and step S132, respectively, and will not be repeated here.

[0165] Exemplarily, step S331 includes step S331a, step S331b, step S331c and step S331d.

[0166] Step S331a, determining the imaging depth of the ultrasonic imaging device. Step S331b, determining the imaging time of a single scanning line of the ultrasonic imaging device according to the imaging depth. Step S331c, determining the scanning line density of the ultrasonic wave corresponding to the desired lateral resolution according to the desired lateral resolution and the focal length of the transducer. Step S331d, determining the imaging frame rate corresponding to the desired lateral resolution according to the scanning line density and the imaging time. Step S331a, step S331b, step S331c and step S331d are similar to the above-mentioned step S131a, step S131b, step S131c and step S131d, respectively, and will not be repeated here.

[0167] Figure 4 FIG. 1 is a schematic diagram showing the relationship between the imaging quality and the imaging speed of an ultrasonic imaging device according to an embodiment of the present invention. Figure 4 As shown, the imaging quality can be represented by spatial resolution and imaging depth respectively. Spatial resolution can include axial resolution, lateral resolution and retraction resolution. According to an embodiment of the present invention, the parameters of the ultrasonic imaging device are determined based on the requirements for imaging quality. The lateral resolution affects the line density, the retraction resolution affects the frame spacing, and the imaging depth affects the echo time. The above-mentioned influencing factors jointly affect the imaging quality. During the ultrasonic imaging process, the transducer rotates and retracts at the same time. That is, the imaging speed mainly includes the rotation speed and the retraction speed. Further, the rotating motor speed affects the rotation speed of the transducer, which in turn affects the frame rate. The retraction motor speed affects the retraction speed and then affects the frame spacing. The frame rate affects the frame spacing. Moreover, the frame rate affects the imaging time, and the frame rate is affected by the line density. Therefore, the imaging parameters can be determined based on the expected imaging quality and the correlation between the imaging quality and the imaging speed. The imaging scan is performed based on the imaging parameters, and high-performance and time-effective imaging can be achieved. Specifically, the target imaging frame rate, target frame spacing and target retraction speed are determined according to the expected axial resolution, the expected lateral resolution and the expected retraction resolution. Ultimately, high-speed imaging is achieved while ensuring high imaging quality.

[0168] Exemplarily, according to another aspect of the present invention, an ultrasonic imaging device is also provided. The ultrasonic imaging device includes a catheter, a catheter controller and a host computer. A transducer is fixedly arranged in the catheter. The transducer is used to transmit and receive ultrasonic waves. The host computer is used to determine the target imaging frame rate and target withdrawal speed of the ultrasonic imaging device based on the parameter determination method of the ultrasonic imaging device, and control the catheter controller to drive the catheter to drive the transducer to withdraw and rotate, so that the ultrasonic imaging device performs ultrasonic imaging at the target withdrawal speed and target imaging frame rate.

[0169] The pulse signal emitted by the catheter controller can control the transducer to emit ultrasonic waves. The transducer can also receive the reflected ultrasonic waves, convert the ultrasonic waves from acoustic signals to echo signals of electrical signals, and transmit them to the catheter controller for processing. The catheter controller can specifically include a rotating motor and a retraction motor. The rotating motor is used to drive the rotation of the catheter. Further, the rotation speed of the catheter is related to the target imaging frame rate. Similarly, the retraction motor is used to drive the retraction of the catheter. Further, the retraction of the catheter is performed at a target retraction speed. The host computer can control the catheter controller to drive the operation of the rotating motor and the retraction motor respectively, so as to drive the catheter to drive the transducer to retract at the target retraction speed and rotate at the rotation speed corresponding to the target imaging frame rate, so as to realize the ultrasonic imaging device to perform ultrasonic imaging at the target retraction speed and the target imaging frame rate. The target retraction speed and the target imaging frame rate can be determined by the host computer based on the parameter determination method of the above-mentioned ultrasonic imaging device.

[0170] In practical applications, the ultrasound imaging device may also include an ECG device. That is, ultrasound imaging may be controlled based on ECG gating technology. The ECG signal of the subject may be acquired through the ECG device to determine the subject's real-time cardiac state. When the subject's cardiac state is in a relatively quiet period (e.g., TR band), the rotation motor and the retraction motor are controlled to start, so as to control the rotation and retraction of the catheter and perform ultrasound imaging. This further ensures that the ultrasound image is acquired in a relatively quiet stage, realizes cardiac synchronous imaging, further eliminates motion artifacts, and reduces the impact of heartbeat on the quality of ultrasound retraction imaging.

[0171] The above-mentioned ultrasonic imaging device can provide a higher retraction speed while ensuring a comprehensive scan of the target tissue, thereby increasing the inspection speed, reducing the negative impact of the cardiac cycle on ultrasonic imaging, and achieving high-performance and time-effective imaging. At the same time, for ultrasonic imaging during surgery, a higher inspection speed can improve surgical efficiency and reduce the risk to the subject.

[0172] Exemplarily, the transducer in the ultrasonic imaging device is made of ceramic, ceramic composite material, piezoelectric single crystal or piezoelectric single crystal composite material.

[0173] Ceramic is an information functional ceramic material that can convert mechanical energy and electrical energy into each other. Ceramic composite materials are made by combining ceramic materials with other materials to improve their comprehensive performance. Ceramic materials themselves have good piezoelectric properties. Combining them with other materials can improve durability and reliability while maintaining or enhancing their piezoelectric properties. Piezoelectric single crystal materials have a more uniform crystal structure, which has better piezoelectric properties and higher sensitivity. Piezoelectric single crystal composite materials combine piezoelectric single crystal materials with other materials to improve their comprehensive performance.

[0174] Therefore, a transducer made of ceramic, ceramic composite material, piezoelectric single crystal or piezoelectric single crystal composite material can have better performance and be more suitable for high-speed ultrasonic inspection.

[0175] Exemplarily, the catheter controller includes a digital-to-analog converter and a processor. The digital-to-analog converter is connected between the processor and the transducer and is used to convert an analog signal from the transducer into a digital signal. The processor is used to generate an ultrasound image based on the digital signal. The sampling rate of the digital-to-analog converter is 3 to 5 times the center frequency of the transducer.

[0176] After the transducer receives the reflected ultrasonic wave, it can convert the ultrasonic wave into an analog electrical signal and transmit the analog electrical signal to the digital-to-analog converter. The digital-to-analog converter converts the analog electrical signal into a digital signal and transmits the digital signal to the processor. The processor processes the digital signal to generate an ultrasonic image. According to the Nyquist sampling theorem, the sampling frequency can be greater than or equal to twice the highest frequency in the analog signal spectrum. Considering the data rate and memory usage, preferably, the sampling rate of the digital-to-analog converter is 3 to 5 times the center frequency of the transducer.

[0177] In the above technical solution, the sampling rate of the digital-to-analog converter is 3 to 5 times the center frequency of the transducer, which not only ensures correct sampling, but also reduces memory usage and improves data processing efficiency.

[0178] Exemplarily, the catheter controller and the host computer communicate with each other using a high-speed serial computer expansion bus interface or a gigabit network interface. The high-speed serial computer expansion bus standard (PICE) belongs to high-speed serial point-to-point dual-channel high-bandwidth transmission. The connected devices are allocated exclusive channel bandwidth and do not share the bus bandwidth. Gigabit Ethernet, also known as Gigabit Ethernet, is a description of various Ethernet frame transmission technologies at a rate of 1G bits per second. The gigabit network interface can perform high-speed data transmission.

[0179] The above technical solution can provide a high-speed data transmission interface, which can ensure that in the case of rapid ultrasonic examination, a large amount of data generated by the rapid examination can be transmitted and processed in a timely manner.

[0180] According to yet another aspect of the present invention, an electronic device for an ultrasonic imaging device is provided. Figure 5 FIG. 5 shows a schematic block diagram of an electronic device 500 for an ultrasonic imaging device according to an embodiment of the present invention. Figure 5 As shown, the electronic device 500 for ultrasonic imaging device includes a processor 510 and a memory 520. The memory 520 stores computer program instructions, which are used to execute the parameter determination method of the ultrasonic imaging device as described above when the processor 510 is running.

[0181] According to another aspect of the present invention, a storage medium is also provided, on which program instructions are stored, and the program instructions are used to execute the parameter determination method of the ultrasonic imaging device in the above embodiment when running. The storage medium may include, for example, an erasable programmable read-only memory (EPROM), a portable read-only memory (CD-ROM), a USB memory, or any combination of the above storage media. The storage medium may be any combination of one or more computer-readable storage media.

[0182] According to yet another aspect of the present invention, a computer program product is provided, comprising computer program instructions, which are used to execute the parameter determination method of the ultrasonic imaging device in the above embodiment when the computer program instructions are run.

[0183] A person skilled in the art can understand the specific implementation scheme and beneficial effects of the above-mentioned ultrasonic imaging device, electronic device for the ultrasonic imaging device, storage medium and computer program product by reading the relevant description of the parameter determination method of the above-mentioned ultrasonic imaging device. For the sake of brevity, they will not be repeated here.

[0184] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the exemplary embodiments described above are merely exemplary and are not intended to limit the scope of the present invention thereto. Various changes and modifications may be made therein by one of ordinary skill in the art without departing from the scope and spirit of the present invention. All such changes and modifications are intended to be included within the scope of the present invention as required by the appended claims.

[0185] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0186] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0187] Similarly, it should be understood that in order to streamline the present invention and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present invention should not be interpreted as reflecting the following intention: the claimed invention requires more features than the features explicitly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby expressly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present invention.

[0188] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0189] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0190] The various component embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It should be understood by those skilled in the art that a microprocessor or a digital signal processor (DSP) may be used in practice to implement the functions of an electronic device for an ultrasonic imaging device according to an embodiment of the present invention. The present invention may also be implemented as a device program (e.g., a computer program and a computer program product) for executing part or all of the methods described herein. Such a program for implementing the present invention may be stored on a computer-readable medium, or may be in the form of one or more signals. Such a signal may be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0191] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

[0192] The above is only a specific embodiment of the present invention or an explanation of a specific embodiment. The protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for determining parameters of an ultrasonic imaging device, characterized in that: include: Determining the expected axial resolution, expected lateral resolution, and expected pullback resolution of the ultrasound imaging device for ultrasound pullback imaging; Determining imaging performance parameters of a transducer in the ultrasonic imaging device according to the desired axial resolution; Determining a target imaging frame rate for ultrasonic pullback imaging by the ultrasonic imaging device according to the imaging performance parameter and the desired lateral resolution; Determining a target frame spacing for ultrasonic pullback imaging by the ultrasonic imaging device according to the expected pullback resolution; A target retraction speed of the ultrasonic imaging device for performing ultrasonic retraction imaging is determined according to the target frame spacing and the target imaging frame rate.

2. The method for determining parameters of an ultrasonic imaging device according to claim 1, wherein: The step of determining the expected axial resolution, the expected lateral resolution, and the expected retraction resolution of the ultrasonic imaging device for performing ultrasonic retraction imaging comprises: Acquiring a parameter set of a target tissue to be subjected to ultrasonic pullback imaging, wherein the parameter set includes a tissue structure size; The expected axial resolution, the expected lateral resolution and the expected pullback resolution of the ultrasonic pullback imaging performed by the ultrasonic imaging device are determined according to the tissue structure size in the parameter set of the target tissue.

3. The method for determining parameters of an ultrasonic imaging device according to claim 1, wherein: The imaging performance parameters include center frequency and focal length; The method for determining parameters of the ultrasonic imaging device further includes: Acquiring the size of the emitting surface of the transducer of the ultrasonic imaging device; Determining the imaging performance parameters of the transducer in the ultrasonic imaging device according to the expected axial resolution includes: Determining the center frequency of the transducer according to the desired axial resolution; The focal length of the transducer is determined according to the central frequency of the transducer and the size of the emitting surface.

4. The method for determining parameters of an ultrasonic imaging device according to claim 3, wherein: Determining the focal length of the transducer according to the center frequency of the transducer and the size of the emitting surface comprises: Determining the wavelength of the ultrasonic wave emitted by the transducer according to the center frequency; The focal length is determined according to the size of the emitting surface and the wavelength.

5. The method for determining parameters of an ultrasonic imaging device according to any one of claims 1 to 4, characterized in that: The ratio of the imaging frame rate corresponding to the desired lateral resolution to the target imaging frame rate is within a first ratio interval; A ratio of the expected pullback resolution to the target frame spacing is within a second ratio interval.

6. The method for determining parameters of an ultrasonic imaging device according to claim 5, characterized in that: Determining a target imaging frame rate for ultrasonic pullback imaging by the ultrasonic imaging device according to the imaging performance parameter and the expected lateral resolution includes: Determining an imaging frame rate corresponding to the desired lateral resolution according to the imaging performance parameter; The target imaging frame rate is determined according to the imaging frame rate corresponding to the desired lateral resolution.

7. The method for determining parameters of an ultrasonic imaging device according to claim 6, wherein: Determining the imaging frame rate corresponding to the desired lateral resolution according to the imaging performance parameter includes: determining an imaging depth of the ultrasonic imaging device; Determining an imaging time of a single scanning line of the ultrasonic imaging device according to the imaging depth; Determining a scanning line density of ultrasound waves corresponding to the desired lateral resolution according to the desired lateral resolution and the focal length of the transducer; An imaging frame rate corresponding to the desired lateral resolution is determined according to the scanning line density and the imaging time.

8. The method for determining parameters of an ultrasonic imaging device according to claim 5, characterized in that: The first ratio interval and the second ratio interval are both intervals [1, 2].

9. A method for determining parameters of an ultrasonic imaging device, characterized in that: include: Determining the expected axial resolution, expected lateral resolution, and expected pullback resolution of the ultrasound imaging device for ultrasound pullback imaging; Determining imaging performance parameters of a transducer in the ultrasonic imaging device according to the desired axial resolution, the desired lateral resolution, and the desired withdrawal resolution; Determining a target imaging frame rate for ultrasonic pullback imaging by the ultrasonic imaging device according to the imaging performance parameter and the desired lateral resolution; Determining a target frame spacing for ultrasonic pullback imaging by the ultrasonic imaging device according to the expected pullback resolution; A target retraction speed of the ultrasonic imaging device for performing ultrasonic retraction imaging is determined according to the target frame spacing and the target imaging frame rate.

10. The method for determining parameters of an ultrasonic imaging device according to claim 9, characterized in that: The step of determining the expected axial resolution, the expected lateral resolution, and the expected retraction resolution of the ultrasonic imaging device for performing ultrasonic retraction imaging comprises: Acquiring a parameter set of a target tissue to be subjected to ultrasonic pullback imaging, wherein the parameter set includes a tissue structure size; The expected axial resolution, the expected lateral resolution and the expected pullback resolution of the ultrasonic pullback imaging performed by the ultrasonic imaging device are determined according to the tissue structure size in the parameter set of the target tissue.

11. The method for determining parameters of an ultrasonic imaging device according to claim 9, wherein: The imaging performance parameters include the center frequency, focal length and the size of the emitting surface. The emitting surface of the transducer is rectangular, and the size of the emitting surface includes the length and width of the emitting surface. Determining the imaging performance parameters of the transducer in the ultrasonic imaging device according to the expected axial resolution, the expected lateral resolution, and the expected withdrawal resolution includes: Determining the center frequency of the transducer according to the desired axial resolution; Determining the width of the emitting surface of the transducer according to the desired lateral resolution; Determining the length of the emitting surface of the transducer according to the desired pullback resolution; The focal length of the transducer is determined according to the central frequency of the transducer and the width or length of the emitting surface.

12. The method for determining parameters of an ultrasonic imaging device according to claim 11, characterized in that: Determining the focal length of the transducer according to the center frequency of the transducer and the width or length of the emitting surface comprises: Determining the wavelength of the ultrasonic wave emitted by the transducer according to the center frequency; The focal length is determined according to the width or length of the emitting surface and the wavelength.

13. The method for determining parameters of an ultrasonic imaging device according to any one of claims 9 to 12, characterized in that: The ratio of the imaging frame rate corresponding to the desired lateral resolution to the target imaging frame rate is within a first ratio interval; A ratio of the expected pullback resolution to the target frame spacing is within a second ratio interval.

14. The method for determining parameters of an ultrasonic imaging device according to claim 13, wherein: Determining a target imaging frame rate for ultrasonic pullback imaging by the ultrasonic imaging device according to the imaging performance parameter and the expected lateral resolution includes: Determining an imaging frame rate corresponding to the desired lateral resolution according to the imaging performance parameter; The target imaging frame rate is determined according to the imaging frame rate corresponding to the desired lateral resolution.

15. The method for determining parameters of an ultrasonic imaging device according to claim 14, characterized in that: Determining the imaging frame rate corresponding to the desired lateral resolution according to the imaging performance parameter includes: determining an imaging depth of the ultrasonic imaging device; Determining an imaging time of a single scanning line of the ultrasonic imaging device according to the imaging depth; Determining a scanning line density of the ultrasound wave corresponding to the desired lateral resolution according to the desired lateral resolution and the focal length of the transducer; An imaging frame rate corresponding to the desired lateral resolution is determined according to the scanning line density and the imaging time.

16. The method for determining parameters of an ultrasonic imaging device according to claim 13, characterized in that: The first ratio interval and the second ratio interval are both intervals [1, 2].

17. An ultrasonic imaging device, characterized in that: It includes a catheter, a catheter controller and a host computer. A transducer is fixedly arranged in the catheter, and the transducer is used to transmit and receive ultrasonic waves; The host computer is used to determine the target imaging frame rate and the target retraction speed of the ultrasonic imaging device based on the parameter determination method of the ultrasonic imaging device described in any one of claims 1 to 16, and control the catheter controller to drive the catheter to drive the transducer to retract and rotate, so that the ultrasonic imaging device performs ultrasonic imaging at the target retraction speed and the target imaging frame rate.

18. The ultrasonic imaging device according to claim 17, characterized in that: The transducer is made of ceramic, ceramic composite material, piezoelectric single crystal or piezoelectric single crystal composite material.

19. The ultrasonic imaging device according to claim 17, characterized in that: The catheter controller includes a digital-to-analog converter and a processor, The digital-to-analog converter is connected between the processor and the transducer and is used to convert the analog signal from the transducer into a digital signal; The processor is used to generate an ultrasound image according to the digital signal; Wherein, the sampling rate of the digital-to-analog converter is 3 to 5 times the center frequency of the transducer.

20. The ultrasonic imaging device according to claim 17, characterized in that: The catheter controller and the host computer communicate with each other using a high-speed serial computer expansion bus interface or a gigabit network interface.

21. An electronic device for an ultrasonic imaging device, characterized in that: include: A processor and a memory, wherein the memory stores computer program instructions, and the computer program instructions are used by the processor to execute the parameter determination method of the ultrasonic imaging device according to any one of claims 1 to 16 when the processor is running.

22. A storage medium having program instructions stored thereon, characterized in that: The program instructions are used to execute the parameter determination method of the ultrasonic imaging device according to any one of claims 1 to 16 when running.

23. A computer program product comprising computer program instructions, characterized in that The computer program instructions are used to execute the parameter determination method of the ultrasonic imaging device according to any one of claims 1 to 16 when being executed.

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