CN219000345U - Miniature multi-frequency array type ultrasonic transducer and multi-frequency ultrasonic three-dimensional imaging probe - Google Patents
Miniature multi-frequency array type ultrasonic transducer and multi-frequency ultrasonic three-dimensional imaging probe Download PDFInfo
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Abstract
The utility model relates to a miniature multi-frequency array type ultrasonic transducer and a multi-frequency ultrasonic three-dimensional imaging probe, wherein the transducer comprises a plurality of rows of transducer linear arrays and a supporting seat, the transducer linear arrays are fixed on the supporting seat, and the working frequency of each row of transducer linear arrays is different; the transducer linear array comprises a plurality of transducer array elements and an isolation shielding layer, wherein the isolation shielding layer is arranged between adjacent transducer array elements. According to the utility model, a natural cavity enters the human body to carry out endoscopic imaging on a target, three-dimensional scanning imaging of the micro-array transducer is realized by combining mechanical 360-degree circular scanning with plane wave rapid data acquisition, and three-dimensional imaging quality is improved by the multi-frequency array transducer with a triangular structure and the multi-frequency imaging technology thereof, so that the requirements of various interventional ultrasonic diagnosis and operation are met.
Description
Technical Field
The utility model relates to the technical field of medical ultrasonic endoscopic imaging, in particular to a miniature multi-frequency array type ultrasonic transducer and a multi-frequency ultrasonic three-dimensional imaging probe.
Background
The miniature ultrasonic transducer can enter the human body to dynamically display images of positions such as blood vessels, alimentary tracts, bronchi and the like in real time, and plays an irreplaceable role in clinic. However, the two-dimensional ultrasound images obtained by conventional miniature ultrasound transducers do not provide adequate anatomical and positional information, where the success of a diagnostic or interventional procedure is largely dependent on the skill and experience of the operator in performing these tasks, a variable, subjective procedure that may lead to an unreasonable decision by the physician in diagnosing, planning and administering the treatment. The ultrasonic three-dimensional imaging can fully display the spatial anatomical relation of tissues, so that the shape and the position of the lesion are easier to obtain, the diagnosis accuracy of the disease can be obviously improved, and the advantages are obvious in intra-operative navigation. Therefore, achieving three-dimensional imaging of miniature transducers is of great clinical value. However, due to size limitations, three-dimensional imaging of miniature ultrasonic transducers remains a difficult problem, which limits the application of ultrasonic three-dimensional imaging techniques in the interventional imaging field, and how to realize three-dimensional imaging of miniature ultrasonic transducers becomes a problem to be solved.
Common three-dimensional ultrasound imaging methods include free scanning, two-dimensional arrays, and mechanical scanning. The free scanner does not need a motorized device, an operator can hold the transducer and scan the anatomical structure of the imaging target in a conventional manner, the operation is simple and convenient, and the cost is low, but the operator needs to carefully move the probe at a constant linear speed or angular speed to obtain regularly spaced two-dimensional images, so that the geometric accuracy of the 3D images cannot be guaranteed, the diagnosis accuracy is poor, and certain difficulty exists in measurement. The volume scanning of ultrasonic beams is realized through electronic scanning by the two-dimensional array ultrasonic three-dimensional imaging, the integration level is high, the three-dimensional scanning speed is high, but the volume of the two-dimensional array transducer is generally large due to the huge array element number, and the two-dimensional array transducer is difficult to apply to the miniature transducer after being integrated with a circuit. The mechanical scanning method is a method of rapidly obtaining a series of 2D ultrasound images and performing three-dimensional imaging by using an electromechanical device to translate, tilt, or rotate a transducer. The method can accurately know the relative position and direction of each two-dimensional image, can optimize and minimize the scanning time while fully sampling the volume, and the obtained three-dimensional image quality has better plane resolution, fewer side lobes and higher sensitivity.
For miniature transducers, the method of rotary mechanical scanning is certainly more applicable, and this type of motion can be achieved by connecting an external driving mechanism through a flexible shaft, is suitable for compact structures, and is applied to endoscopic imaging of transesophageal or transrectal ultrasonic transducers.
However, due to huge volume of three-dimensional data, when the three-dimensional imaging is performed by using a rotary mechanical scanning method, the conventional line-by-line scanning method cannot meet the requirement of rapid acquisition of three-dimensional image data, so that the three-dimensional imaging speed is slow, the real-time performance is poor, and the imaging of a moving object is not facilitated, so that a rapid three-dimensional data acquisition method is still needed. The plane wave method is an effective means for realizing rapid acquisition of three-dimensional data, realizes that plane waves penetrate the whole imaging view field in one transmission through concurrent signal excitation, and obtains corresponding image information through an echo signal reconstruction algorithm. Therefore, the three-dimensional scanning imaging of the micro array transducer is certainly more operative through a mechanical 360-degree circular scanning combined with a plane wave rapid data acquisition method.
Meanwhile, as the two-dimensional images acquired by the mechanical rotation scanning method are intersected along the axis, the spatial sampling near the axis is highest, the spatial sampling far away from the axis is lowest, and the radial resolution and the vertical resolution of the acquired two-dimensional images are reduced along with the distance from the transducer, so that the spatial distribution of the resolution of the images is inconsistent. The combination of these effects will result in a complex variation in three-dimensional image resolution with the highest resolution in the region near the axis location and a decrease in resolution anywhere away from the axis, which directly reduces the image quality of three-dimensional imaging. Moreover, since the center frequency of the transducer plays a decisive role in the resolution of an ultrasonic image, the higher the frequency is, the more easily a high-quality image is obtained, but the increase of the frequency is accompanied by the increase of attenuation, so that the detection depth is reduced, the imaging range of the transducer is limited, the clinical application is very unfavorable, the contradiction between the imaging resolution and the imaging depth also exists in three-dimensional imaging, the improvement of the quality of the three-dimensional image is further limited, and the application is unfavorable. How to improve the quality of the three-dimensional image obtained by the mechanical rotation scanning method is a key problem for realizing the three-dimensional imaging of the miniature ultrasonic transducer.
Disclosure of Invention
To achieve the above and other advantages and in accordance with the purpose of the present utility model, a first object of the present utility model is to provide a micro multi-frequency array type ultrasonic transducer, including a plurality of rows of transducer linear arrays, a supporting seat, wherein the transducer linear arrays are fixed on the supporting seat, and each row of transducer linear arrays has a different working frequency; the transducer linear array comprises a plurality of transducer array elements and an isolation shielding layer, wherein the isolation shielding layer is arranged between adjacent transducer array elements.
Further, the device also comprises an isolation filler, wherein the isolation filler is arranged between adjacent transducer linear arrays.
Further, the device also comprises a plurality of acoustic lenses, wherein the acoustic lenses are closely attached to the emitting surface of the transducer array element.
Further, the supporting seat is of a triangular prism structure.
Further, the number of the transducer linear arrays is three, and the transducer linear arrays are respectively fixed on the side surfaces of the supporting seat.
Further, the relation among the number N of transducer elements, the imaging area size L and the imaging element size p of the three-column transducer linear array is l=n×p.
Further, the number N of the transducer array elements of the three-column transducer array is 8 integer digits.
Further, the curvature radius R of the acoustic lens is consistent with the flexible shaft radius of the probe catheter.
Further, the radius of curvature R of the acoustic lens is adjusted by the following formula:
wherein f is the focal length of the lens, c Medium (D) and cPenetrating pipe The speed of sound of the transmission medium and the lens material, respectively.
Further, the acoustic lens is a convex lens, and the sound velocity of the lens material is smaller than the sound velocity of the transmission medium.
The second object of the utility model is to provide a multi-frequency ultrasonic three-dimensional imaging probe, which comprises the miniature multi-frequency array ultrasonic transducer, a scanning and positioning control device, a sheath tube and a probe catheter; the sheath tube is sleeved on the miniature multi-frequency array type ultrasonic transducer, and the scanning and positioning control device is connected with the miniature multi-frequency array type ultrasonic transducer through the probe catheter; the scanning and positioning control device drives the probe catheter to rotate together with the miniature multi-frequency array type ultrasonic transducer and the sheath tube, so that 360-degree circular scanning of the miniature multi-frequency array type ultrasonic transducer is realized.
Further, the probe catheter comprises a sleeve, a flexible shaft and a plurality of leads, wherein the sleeve is sleeved on the flexible shaft, the leads are arranged in the flexible shaft, one end of the flexible shaft is connected with the scanning and positioning control device, the other end of the flexible shaft is connected with the miniature multi-frequency array type ultrasonic transducer, and each transducer array element of the miniature multi-frequency array type ultrasonic transducer is connected with an external imaging hardware system through the leads.
Further, a sound transmission window is arranged on the sheath tube and is positioned at the miniature multi-frequency array type ultrasonic transducer.
Further, the scanning and positioning control device is a scanning and positioning control handle.
Further, a rotating motor and a control system thereof are arranged in the scanning and positioning control handle, and the control system controls the rotating motor to drive the flexible shaft, the micro multi-frequency array ultrasonic transducer and the sheath tube to rotate.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a miniature multi-frequency array type ultrasonic transducer and a multi-frequency ultrasonic three-dimensional imaging probe, which enter the human body through a natural cavity to carry out endoscopic imaging on a target. The three-dimensional scanning imaging of the micro array transducer is realized by combining mechanical 360-degree circular scanning with plane wave rapid data acquisition, and the three-dimensional imaging quality is improved by the multi-frequency array transducer with a triangular structure and the multi-frequency imaging technology thereof, so that the requirements of various interventional ultrasonic diagnosis and operation are met.
The miniature multi-frequency array type ultrasonic transducer and the multi-frequency ultrasonic three-dimensional imaging probe provided by the utility model are potential solutions for further improving the three-dimensional imaging quality of the miniature transducer. The multi-frequency ultrasonic transducer can work at different center frequencies and can be flexibly switched, when the multi-frequency ultrasonic transducer works under a low-frequency condition, a large detection depth can be obtained, rough information of a large area is obtained, and after a suspicious part is found, the multi-frequency ultrasonic transducer is switched to a high-frequency working condition to obtain detailed pathological information. The multi-frequency transducer technology is applied to ultrasonic three-dimensional imaging, is hopeful to relieve the problem of inconsistent spatial distribution of resolution in the three-dimensional imaging of the miniature transducer, and simultaneously gives consideration to imaging resolution and imaging depth, thereby further improving imaging quality and having good application potential.
The foregoing description is only an overview of the present utility model, and is intended to provide a better understanding of the present utility model, as it is embodied in the following description, with reference to the preferred embodiments of the present utility model and the accompanying drawings. Specific embodiments of the present utility model are given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:
FIG. 1 is a diagram showing the overall structure of a multi-frequency array transducer of a triangle structure of embodiment 1;
FIG. 2 is a cross-sectional view of a multi-frequency array transducer of the triangular structure of example 1;
FIG. 3 is a cross-sectional view of a transducer of the acoustic lens of embodiment 1;
FIG. 4 is a diagram of the structure of a multi-frequency ultrasound three-dimensional imaging probe of example 2;
FIG. 5 is an overall view of the probe catheter of example 2;
FIG. 6 is a cross-sectional view of the probe catheter of example 2;
FIG. 7 is a flow chart of an imaging method of the multi-frequency ultrasound three-dimensional imaging probe of example 3;
FIG. 8 is a schematic diagram of a progressive loop scanning+axial scanning method in embodiment 3;
FIG. 9 is a schematic diagram of a tangential line-by-line scanning+circular scanning method in example 3;
FIG. 10 is a cut-plane multi-angle plane wave + circular sweep rapid plot of example 3;
fig. 11 is a flowchart of processing of three-dimensional image data of embodiment 3.
Detailed Description
The present utility model will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
The multi-frequency transducer and the multi-frequency imaging method thereof are potential solutions for further improving the three-dimensional imaging quality of the miniature transducer. The multi-frequency ultrasonic transducer can work at different center frequencies and can be flexibly switched, when the multi-frequency ultrasonic transducer works under a low-frequency condition, a large detection depth can be obtained, rough information of a large area is obtained, and after a suspicious part is found, the multi-frequency ultrasonic transducer is switched to a high-frequency working condition to obtain detailed pathological information. After the image fusion technology is utilized, the ultrasonic images corresponding to different frequencies can be fused, so that the image with higher quality is obtained. The multi-frequency ultrasonic transducer can greatly enrich the information of ultrasonic images, is an important development direction of the ultrasonic transducer, and is applied to the aspects of visualization of vascular coronary arteries, ultrasonic microbubble control, real-time high-frequency imaging, diagnosis of vulnerable plaques of blood vessels and the like. The multi-frequency transducer technology is applied to ultrasonic three-dimensional imaging, is hopeful to relieve the problem of inconsistent spatial distribution of resolution in the three-dimensional imaging of the miniature transducer, and simultaneously gives consideration to imaging resolution and imaging depth, thereby further improving imaging quality and having good application potential.
Based on the analysis, the utility model provides a miniature array transducer and a probe, the three-dimensional imaging quality is improved through the multi-frequency array transducer with a triangular structure and the multi-frequency imaging technology thereof, and finally, the high-quality three-dimensional imaging method of the miniature transducer is realized, thereby meeting the requirements of various interventional ultrasonic diagnosis and operation.
Example 1
The miniature multi-frequency array ultrasonic transducer enters the human body through a natural cavity channel to carry out endoscopic imaging on a target, as shown in fig. 1 and 2, comprises a plurality of rows of transducer linear arrays and supporting seats, wherein the transducer linear arrays are fixed on the supporting seats, and the working frequency of each row of transducer linear arrays is different; the transducer linear array comprises a plurality of transducer array elements and an isolation shielding layer, wherein the isolation shielding layer is arranged between adjacent transducer array elements.
As shown in fig. 1-3, the transducer array further comprises isolation fillers, wherein the isolation fillers are arranged between adjacent transducer arrays.
In order to further improve the imaging quality, as shown in fig. 3, the device further comprises a plurality of acoustic lenses, and the acoustic lenses are closely attached to the emitting surface of the transducer array element. The acoustic lens can focus the beam, thereby reducing the width of the beam and improving the image resolution. The curvature radius R of the acoustic lens can be consistent with the flexible shaft radius of the probe catheter, and can also be adjusted by the following formula:
wherein f is the focal length of the lens, c Medium (D) and cPenetrating pipe The speed of sound of the transmission medium and the lens material, respectively. In this embodiment, the acoustic lens is a convex lens, so the acoustic velocity of the lens material needs to be smaller than that of the transmission mediumSound velocity of mass.
In this embodiment, the supporting seat is in a triangular prism structure, the number of the transducer linear arrays is three, and the transducer linear arrays are respectively fixed on the side surfaces of the supporting seat. The working frequencies of each array of transducers are different and can work at three frequencies at the same time, the selection of the three frequencies can be selected according to the requirements of imaging depth and imaging resolution, and the working frequencies are 12MHz, 20MHz and 30MHz as shown in figure 2. The relation among the array element number N, the imaging area size L and the imaging array element size p of the three-column transducer linear array is L=N×p, and N is an integer bit of 8 for facilitating the implementation of calculation software and hardware.
It should be understood that the supporting base is not limited to the triangular prism structure, and may be configured according to practical situations. Correspondingly, the number and the placement positions of the transducer linear arrays can be set according to actual requirements.
Example 2
A multi-frequency ultrasonic three-dimensional imaging probe, as shown in figures 4 and 5, comprises a miniature multi-frequency array type ultrasonic transducer, a scanning and positioning control device, a sheath tube and a probe catheter; the sheath tube is sleeved on the miniature multi-frequency array type ultrasonic transducer, namely the miniature multi-frequency array type ultrasonic transducer is integrally arranged in the sheath tube, and the scanning and positioning control device is connected with the miniature multi-frequency array type ultrasonic transducer through the probe catheter; the scanning and positioning control device drives the probe catheter to rotate together with the miniature multi-frequency array type ultrasonic transducer and the sheath tube, so that 360-degree circular scanning of the miniature multi-frequency array type ultrasonic transducer is realized. For a detailed description of the micro multi-frequency array type ultrasonic transducer, reference may be made to the corresponding description in the above micro multi-frequency array type ultrasonic transducer embodiment, and the detailed description is omitted herein.
As shown in fig. 6, the probe catheter comprises a sleeve, a flexible shaft and a plurality of leads, wherein the sleeve is sleeved on the flexible shaft to play a role in protection and isolation; the lead is arranged in the flexible shaft, one end of the flexible shaft is connected with the scanning and positioning control device, the other end of the flexible shaft is connected with the miniature multi-frequency array type ultrasonic transducer, and the flexible shaft mainly plays a role in torque transmission; each transducer array element of the miniature multi-frequency array type ultrasonic transducer is connected with an external imaging hardware system through a lead wire, and plays roles in driving excitation and echo signal transmission. During imaging, the flexible shaft drives the transducer to rotate, and ultrasonic scanning of the corresponding three-dimensional area is completed through rotation.
The sheath tube is provided with an acoustic window, and the acoustic window is positioned at the miniature multi-frequency array type ultrasonic transducer and used for reducing sound waves to meet acoustic matching requirements.
In this embodiment, the scanning and positioning control device is a scanning and positioning control handle. The scanning and positioning control handle is internally provided with a rotating motor and a control system thereof, and the control system controls the rotating motor to drive the flexible shaft, the miniature multi-frequency array type ultrasonic transducer and the sheath tube to rotate, so that 360-degree circular scanning of the transducer is realized.
Example 3
A method for imaging a multi-frequency ultrasound three-dimensional imaging probe of embodiment 2, as shown in fig. 7, comprises the steps of:
through mechanical rotation scanning of the miniature multi-frequency array type ultrasonic transducer, high-frequency signal emission time sequence control of an ultrasonic three-dimensional imaging system is utilized, and after the signals are subjected to coding emission, modulation and power amplification, single-frequency/multi-frequency ultrasonic excitation is carried out on the transducer, so that ultrasonic signals are generated;
the acquisition of single-frequency/multi-frequency ultrasonic echo signals is completed by utilizing the high-frequency signal receiving time sequence control of an imaging system, and the acquired signals are subjected to anti-aliasing filtering, signal amplification and dynamic range adjustment, so that a series of multi-frequency image data corresponding to different scanning positions are obtained.
When conventional two-dimensional imaging is carried out, data acquisition can be realized by beam line-by-line scanning by using the conventional ultrasonic imaging, and as shown in 8, a line-by-line ring scanning and axial scanning method is adopted, and three-dimensional data acquisition is realized by scanning cross sections at different positions one by one; as shown in fig. 9, the tangential plane progressive scanning and circular scanning method realizes three-dimensional scanning by completing the scanning of tangential planes in different angles one by one. The data collection can be performed synchronously (several frequencies work simultaneously) or asynchronously (several frequencies work at different times).
When three-dimensional imaging is carried out, three-dimensional data acquisition is carried out by combining a Plane wave rapid imaging method, the image resolution and contrast are improved by using a Plane wave composite ultrafast imaging (Plane-wave Compounding Ultrafast Imaging) method which is subjected to targeted modification, ultrasonic Plane wave insonification of the whole endoscopic imaging field of view is realized in one transmission by utilizing concurrent ultrasonic transmission signal excitation (conventional ultrasonic imaging is carried out for multiple times, each line needs to be transmitted once or multiple times), and image information of an interested region is obtained through an ultrasonic radio frequency echo signal reconstruction algorithm. The specific process is as follows:
when the transducer radially rotates to a certain position, taking a vertical plane corresponding to the imaging frequency array surface of the transducer as an imaging plane, and realizing the rapid data acquisition of the plane by using a plane wave rapid imaging method and through multi-angle scanning; after the data acquisition of the plane is finished, the next angle plane is entered through the radial rotation of the transducer; and finally, completing the acquisition of the three-dimensional data of the whole cylinder through 360-degree rotation of the transducer. The whole process needs to accurately position the data of each plane in the radial direction, and lays a foundation for the display and fusion of the later three-dimensional images. Three-dimensional data of three frequencies can be performed synchronously or asynchronously, and the process is shown in fig. 10.
And carrying out three-dimensional visualization processing on the acquired three-dimensional imaging data. Specifically, the method comprises the following steps:
the three-dimensional visualization processing of the acquired three-dimensional imaging data comprises the following steps:
after acquiring single-frequency three-dimensional imaging data, multi-frequency three-dimensional image fusion is carried out on the single-frequency three-dimensional imaging data through fusion methods such as weighted image data fusion based on intensity, image data analysis and fusion based on wavelet transformation, image fusion based on morphology, image feature fusion based on image, image data based on position information and the like.
After the multi-frequency three-dimensional image data are obtained, three-dimensional visualization processing is carried out on the multi-frequency three-dimensional image data, namely, three-dimensional image reconstruction and display are carried out. The three-dimensional display of the image can be presented in a plane view and a volume view, and the plane view is used for visualizing any section in the three-dimensional volume image, and is similar to the traditional two-dimensional ultrasound; the Volume view refers to that each pixel value in the three-dimensional image is projected into the Volume view through specific transformation, so as to achieve the effect of three-dimensional display, namely, a Volume Rendering (Volume Rendering) technology, and the obtained three-dimensional Volume data is displayed according to a three-dimensional Volume Rendering (3 d Rendering) technology after three-dimensional filtering, planar reconstruction, edge enhancement, coloring and Rendering, and the specific process is shown in fig. 11.
For a detailed description of the multi-frequency ultrasonic three-dimensional imaging probe, reference may be made to the corresponding description in the above-mentioned embodiments of the multi-frequency ultrasonic three-dimensional imaging probe, and a detailed description thereof will be omitted.
The utility model realizes three-dimensional scanning imaging by combining mechanical 360-degree circular scanning with a plane wave rapid data acquisition method, and improves the quality of three-dimensional imaging by a multi-frequency micro array transducer with a triangular structure and a multi-frequency imaging technology thereof.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The foregoing is illustrative of the embodiments of the present disclosure and is not to be construed as limiting the scope of the one or more embodiments of the present disclosure. Various modifications and alterations to one or more embodiments of this description will be apparent to those skilled in the art. Any modifications, equivalent substitutions, improvements, or the like, which are within the spirit and principles of one or more embodiments of the present disclosure, are intended to be included within the scope of the claims of one or more embodiments of the present disclosure.
Claims (15)
1. A miniature multi-frequency array type ultrasonic transducer, which is characterized in that: the device comprises a plurality of rows of transducer linear arrays and a supporting seat, wherein the transducer linear arrays are fixed on the supporting seat, and the working frequency of each row of transducer linear arrays is different; the transducer linear array comprises a plurality of transducer array elements and an isolation shielding layer, wherein the isolation shielding layer is arranged between adjacent transducer array elements.
2. A miniature multi-frequency array ultrasound transducer according to claim 1, wherein: the transducer array also comprises isolation filling materials, wherein the isolation filling materials are arranged between adjacent transducer linear arrays.
3. A miniature multi-frequency array ultrasound transducer according to claim 1, wherein: the transducer array element also comprises a plurality of acoustic lenses, wherein the acoustic lenses are clung to the emitting surface of the transducer array element.
4. A miniature multi-frequency array ultrasound transducer according to claim 1, wherein: the supporting seat is of a triangular prism structure.
5. The miniature multi-frequency array ultrasonic transducer of claim 4, wherein: the number of the transducer linear arrays is three, and the transducer linear arrays are respectively fixed on the side surfaces of the supporting seat.
6. The miniature multi-frequency array ultrasonic transducer of claim 5, wherein: the number of transducer array elements of the three-column transducer linear arrayNImaging region sizeLImaging array element sizepThe relation between is thatL=N*p 。
7. The miniature multi-frequency array ultrasonic transducer of claim 6, wherein: the number of transducer array elements of the three-column transducer linear arrayNIs an integer of 8.
8. A miniature multi-frequency array ultrasound transducer according to claim 3, wherein: radius of curvature of the acoustic lensRIs consistent with the radius of the flexible shaft of the probe catheter.
9. A miniature multi-frequency array ultrasound transducer according to claim 3, wherein the radius of curvature of the acoustic lensRThe adjustment is made by the following formula:
wherein ,ffor the focal length of the lens,c medium (D) Andc penetrating pipe The speed of sound of the transmission medium and the lens material, respectively.
10. The miniature multi-frequency array ultrasonic transducer of claim 9, wherein: the acoustic lens is a convex lens, and the sound velocity of the lens material is less than the sound velocity of the transmission medium.
11. The utility model provides a three-dimensional imaging probe of multifrequency supersound which characterized in that: a miniature multi-frequency array ultrasonic transducer, a scanning and positioning control device, a sheath tube and a probe catheter according to any one of claims 1 to 10; the sheath tube is sleeved on the miniature multi-frequency array type ultrasonic transducer, and the scanning and positioning control device is connected with the miniature multi-frequency array type ultrasonic transducer through the probe catheter; the scanning and positioning control device drives the probe catheter to rotate together with the miniature multi-frequency array type ultrasonic transducer and the sheath tube, so that 360-degree circular scanning of the miniature multi-frequency array type ultrasonic transducer is realized.
12. The multi-frequency ultrasound three-dimensional imaging probe of claim 11, wherein: the probe catheter comprises a sleeve, a flexible shaft and a plurality of leads, wherein the sleeve is sleeved on the flexible shaft, the leads are arranged in the flexible shaft, one end of the flexible shaft is connected with the scanning and positioning control device, the other end of the flexible shaft is connected with the miniature multi-frequency array type ultrasonic transducer, and each transducer array element of the miniature multi-frequency array type ultrasonic transducer is connected with an external imaging hardware system through the leads.
13. The multi-frequency ultrasound three-dimensional imaging probe of claim 11, wherein: the sheath tube is provided with a sound transmission window, and the sound transmission window is positioned at the miniature multi-frequency array type ultrasonic transducer.
14. The multi-frequency ultrasound three-dimensional imaging probe of claim 12, wherein: the scanning and positioning control device is a scanning and positioning control handle.
15. The multi-frequency ultrasound three-dimensional imaging probe of claim 14, wherein: the scanning and positioning control handle is internally provided with a rotating motor and a control system thereof, and the control system controls the rotating motor to drive the flexible shaft, the miniature multi-frequency array ultrasonic transducer and the sheath tube to rotate.
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