CN215191757U - Linear array probe for photoacoustic imaging with array element frequency changing along with gradient - Google Patents
Linear array probe for photoacoustic imaging with array element frequency changing along with gradient Download PDFInfo
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- CN215191757U CN215191757U CN202121520154.5U CN202121520154U CN215191757U CN 215191757 U CN215191757 U CN 215191757U CN 202121520154 U CN202121520154 U CN 202121520154U CN 215191757 U CN215191757 U CN 215191757U
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Abstract
The utility model discloses a linear array probe for photoacoustic imaging with array element frequency changing along with gradient, which comprises a shell, wherein a plurality of array elements with different frequencies are arranged in the shell, the array elements are distributed in a transverse linear shape, and the center of the shell is provided with an optical fiber which can continuously transmit pulse signals; array element is including the piezoceramics piece, and the piezoceramics piece includes the piezoceramics layer, and electrode layer and bottom electrode layer have been plated respectively on the surface of piezoelectric layer, goes up the electrode layer and is connected with the connector through the lead wire with the bottom electrode layer, and the lower surface of piezoceramics piece is provided with the matching layer, and the upper surface of piezoceramics piece is provided with the back sheet, and the thickness of the piezoceramics piece of a plurality of array elements is increased gradually to the opposite side by probe one side. The advantages are that: the ultrasonic probe is simple and reasonable in structure, the ultrasonic head is formed by the linear array distribution of the array elements with different frequencies, linear receiving frequency gradient is formed, the reflected ultrasonic waves with different frequencies can be received, the frequency bandwidth range of the ultrasonic waves is increased, and the imaging quality is further improved.
Description
Technical Field
The utility model belongs to the technical field of ultrasonic medical probe makes the technique and specifically relates to a linear array probe is used along with gradient change's optoacoustic imaging to array element frequency.
Background
In the field of medical image diagnosis, ultrasound imaging is a common diagnostic method. The ultrasonic imaging is based on the mechanical property of the detected biological tissue, the imaging contrast is low, and meanwhile, the traditional ultrasonic imaging depends on the acoustic impedance change of the biological tissue, and only interface reflection imaging can be realized, and chromatographic imaging cannot be realized.
While the advantage of optical methods lies in its functionality and sensitivity, currently, the interaction of light with tissue is mainly due to both absorption and scattering: wherein the optical absorption property of the tissue is related to the tissue components, and the component change of the tissue can reflect the change of the biochemical state of the tissue body, so that the biochemical state of the tissue body can be judged according to the optical absorption property; light scattering in biological tissues results from random variations in refractive index at the micrometer scale, while the physiological basis for fluctuations in refractive index at the micrometer scale is the variation of biological tissues from one another at the cellular and subcellular levels, so it is believed that changes in morphology of tissue bodies at the cellular and subcellular levels can be inferred from optical scattering properties. In summary, the optical properties of the tissue volume (scattering and absorption) have the ability to assess the biochemical and morphological state of the focal tissue. In addition, the optical properties are sensitive to the above changes occurring in the tissue, which makes it possible to have high image contrast in optical imaging. Therefore, the characteristics of the functionality and the sensitivity of the optical technology can be utilized to quantitatively evaluate the functions of the tissues.
However, light irradiation of biological tissue exhibits strong scattering properties, typically with a scattering coefficient of about 100cm-1, which makes optical imaging impossible with both resolution and imaging depth.
Unlike light propagating in tissue, which exhibits strong scattering, ultrasound scatters 2-3 orders of magnitude less in tissue than light, meaning that ultrasound imaging techniques can somehow be compatible in terms of resolution and imaging depth. However, the source of the graph contrast of the ultrasonic imaging technology is the difference of biological tissues in mechanical properties, the imaging contrast is low, and the ultrasound depends on the acoustic impedance change of the tissues, can only realize interface reflection imaging, cannot realize tomography, is not suitable for the examination of gas-containing organs (such as lung, digestive tract and bones), and also limits the ultrasonic imaging technology in the aspect of early cancer diagnosis; in addition, ultrasound technology does not have the ability to assess tissue body function.
SUMMERY OF THE UTILITY MODEL
The utility model aims at remedying the above-mentioned not enough, to the society disclose simple structure, reasonable array element frequency along with gradient change's linear array probe for photoacoustic imaging, its different frequency array elements through linear arrangement receive the reflection ultrasonic wave of different frequencies, increase the frequency bandwidth scope of ultrasonic wave, improve the imaging quality.
The technical scheme of the utility model is realized like this:
a linear array probe for photoacoustic imaging with array element frequency changing along with gradient comprises a shell, wherein a plurality of array elements with different frequencies are arranged in the shell, the array elements are transversely and linearly distributed, and an optical fiber capable of continuously transmitting pulse signals is arranged in the center of the shell; the array element comprises piezoelectric wafers, the piezoelectric wafers comprise piezoelectric layers, the surfaces of the piezoelectric layers are plated with upper electrode layers and lower electrode layers respectively, the upper electrode layers and the lower electrode layers are connected with a connector through leads, the lower surfaces of the piezoelectric wafers are provided with matching layers, the upper surfaces of the piezoelectric wafers are provided with backing layers, and the thicknesses of the piezoelectric wafers of the array elements are gradually increased from one side of the probe to the other side of the probe.
The measures for further optimizing the technical scheme are as follows:
as an improvement, the array elements are in a rectangular structure, and the width of the array elements is the same.
As an improvement, the connector is provided with a positive terminal and a negative terminal, the upper electrode layer of each array element is respectively connected with the positive terminal through a lead, and the lower electrode layer of each array element is connected with the negative terminal through a lead after being connected through a copper foil.
As an improvement, the center of the shell is provided with a threading tube, and the optical fiber and the lead wire are threaded in the threading tube.
As an improvement, the lead adopts a high-shielding coaxial cable.
As an improvement, the piezoelectric wafer is a piezoelectric ceramic composite wafer.
As an improvement, the number of the array elements is 5 to 10.
Compared with the prior art, the utility model the advantage be:
the utility model discloses a linear array probe is used in optoacoustic imaging of array element frequency along with gradient change, simple structure, reasonable, it is by optic fibre continuously launch pulse signal, and the ultrasonic head that constitutes through a plurality of array elements that are linear array distribution receives the reflected signal, and the ultrasonic head comprises the linear array distribution of array element of different frequencies, forms linear receiving frequency gradient, can receive the reflection ultrasonic wave of different frequencies to increase the frequency bandwidth scope of ultrasonic wave, and then improve the imaging quality.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic sectional view of the present invention;
fig. 3 is an enlarged view of a portion a in fig. 2.
The utility model discloses each reference numeral's name is in the drawing:
the array comprises a shell 1, an array element 2, a piezoelectric layer 21a, an upper electrode layer 21b, a lower electrode layer 21c, a matching layer 22, a backing layer 23, an optical fiber 3, a connector 4, a positive terminal 4a, a negative terminal 4b, a lead 41, a copper foil 42 and a threading tube 5.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings:
as shown in fig. 1 and 3, a linear array probe for photoacoustic imaging with array element frequency changing along with gradient comprises a housing 1, wherein a plurality of array elements 2 with different frequencies are arranged in the housing 1, the array elements 2 are transversely and linearly distributed, and an optical fiber 3 capable of continuously transmitting pulse signals is arranged in the center of the housing 1; the array element 2 comprises a piezoelectric wafer, the piezoelectric wafer comprises a piezoelectric layer 21a, the surface of the piezoelectric layer 21a is plated with an upper electrode layer 21b and a lower electrode layer 21c respectively, the upper electrode layer 21b and the lower electrode layer 21c are connected with the connector 4 through a lead 41, the lower surface of the piezoelectric wafer is provided with a matching layer 22, the upper surface of the piezoelectric wafer is provided with a backing layer 23, and the thickness of the piezoelectric wafers of the array elements 2 is gradually increased from one side of the probe to the other side.
The array elements 2 are in a rectangular structure, and the width of the array elements 2 is the same.
The connector 4 is provided with a positive terminal 4a and a negative terminal 4b, the upper electrode layer 21b of each array element 2 is connected with the positive terminal 4a through a lead 41, and the lower electrode layer 21c of each array element 2 is connected with the negative terminal 4b through a lead 41 after being connected with a copper foil 42. So set up, convenient wiring.
The center of the shell 1 is provided with a threading pipe 5, and the optical fiber 3 and the lead wire 41 are threaded in the threading pipe 5. The arrangement of the threading tube 5 facilitates the installation of the optical fiber 3 and the lead wire 41, and can also play a certain role in protecting the optical fiber 3 and the lead wire 41.
The lead 41 is a high-shielding coaxial cable.
The piezoelectric wafer is a piezoelectric ceramic composite wafer.
The number of the array elements 2 is 5 to 10. In this embodiment, the number of array elements 2 is 7.
The piezoelectric wafers have different thicknesses and are matched with the matching layer 22 and the back lining layer 23 with different thicknesses; the matching layer 22 is prepared by using polymers and fillers according to different filling ratios, the backing material of the backing layer 23 is a composite material with high acoustic impedance and high acoustic attenuation containing air holes, for example, tungsten powder with high filling ratio is filled in epoxy resin to prepare the backing, and in order to improve the acoustic attenuation coefficient, the flexibility of the base material is properly increased (namely, modified treatment is carried out, for example, the method of adding polysulfide rubber is adopted).
The utility model discloses a probe manufacturing method:
the composite material piezoelectric ceramic pieces with different thicknesses are made into a piezoelectric layer 21a through a magnetron sputtering process, and upper electrode layers are respectively plated on the upper surface and the lower surface to form an upper electrode layer 21b and a lower electrode layer 21c, so that piezoelectric wafers with rectangular structures of different heights are made, and the widths of the piezoelectric wafers are the same. Then, the matching layer 22 is formed on the lower surface of the piezoelectric wafer by mixing and curing epoxy glue and inorganic powder, and the backing layer 23 is formed on the upper surface of the piezoelectric wafer by curing epoxy glue, thus forming the array element 2 in a laminated structure. Due to the different thicknesses of the piezoelectric wafer and the matching layer 22 in each array element 2, the frequency of the reflected ultrasonic wave that can be received by each array element will also be different. Array element 2 with different frequencies is according to the thickness gradient distribution (thickness increase gradually) of piezoceramics piece linear arrangement one by one and bonds together, the last electrode layer 21b of each array element 2 is connected with connector 4's positive terminal 4a through lead wire 41, lower electrode layer 21c is connected with connector 4's negative terminal 4b through lead wire 41, connector 4 passes through cable junction external imaging equipment, so make array element group, set up threading pipe 5 at array element group's center, wear to put optic fibre 3 in the threading pipe 5, lead wire 41 also passes from threading pipe 5, make the ultrasonic head, last ultrasonic head wholly encapsulates in shell 1, make the probe.
When the probe is used, the optical fiber 3 continuously transmits pulse signals, the array elements 2 receive reflected ultrasonic waves with different frequencies, and the probe forms a linearly distributed frequency gradient, so that the frequency bandwidth range of the ultrasonic waves can be increased, and the imaging quality is improved.
The above is only a preferred embodiment of the present invention, and not intended to limit the scope of the invention, and it should be appreciated by those skilled in the art that various equivalent substitutions and obvious changes made in the specification and drawings should be included within the scope of the present invention.
Claims (7)
1. A linear array probe for photoacoustic imaging with array element frequency changing along with gradient comprises a shell (1) and is characterized in that: a plurality of array elements (2) with different frequencies are arranged in the shell (1), the array elements (2) are transversely and linearly distributed, and an optical fiber (3) capable of continuously transmitting pulse signals is arranged in the center of the shell (1); the array element (2) comprises a piezoelectric wafer, the piezoelectric wafer comprises a piezoelectric layer (21a), the surface of the piezoelectric layer (21a) is plated with an upper electrode layer (21b) and a lower electrode layer (21c) respectively, the upper electrode layer (21b) and the lower electrode layer (21c) are connected with the connector (4) through leads (41), the lower surface of the piezoelectric wafer is provided with a matching layer (22), the upper surface of the piezoelectric wafer is provided with a backing layer (23), and the thickness of the piezoelectric wafer of the array elements (2) is gradually increased from one side of the probe to the other side of the probe.
2. The linear array probe for photoacoustic imaging according to claim 1, wherein the array element frequency varies with the gradient, and the probe comprises: the array elements (2) are in a rectangular structure, and the width of the array elements (2) is the same.
3. The linear array probe for photoacoustic imaging according to claim 2, wherein the array element frequency varies with the gradient, and the probe comprises: the connector (4) is provided with a positive terminal (4a) and a negative terminal (4b), the upper electrode layer (21b) of each array element (2) is connected with the positive terminal (4a) through a lead (41), and the lower electrode layer (21c) of each array element (2) is connected with the negative terminal (4b) through a lead (41) after being connected through a copper foil (42).
4. A linear array probe for photoacoustic imaging with array element frequency varying with gradient according to claim 3, wherein: the optical fiber cable is characterized in that a threading pipe (5) is arranged in the center of the shell (1), and the optical fiber (3) and the lead (41) penetrate through the threading pipe (5).
5. The linear array probe for photoacoustic imaging according to claim 4, wherein the array element frequency varies with the gradient, and the probe comprises: the lead (41) adopts a high-shielding coaxial cable.
6. The linear array probe for photoacoustic imaging according to claim 5, wherein the array element frequency varies with the gradient, and the probe comprises: the piezoelectric wafer is a piezoelectric ceramic composite wafer.
7. The linear array probe for photoacoustic imaging according to claim 6, wherein the array element frequency varies with the gradient, and the probe comprises: the number of the array elements (2) is 5 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121520154.5U CN215191757U (en) | 2021-07-06 | 2021-07-06 | Linear array probe for photoacoustic imaging with array element frequency changing along with gradient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121520154.5U CN215191757U (en) | 2021-07-06 | 2021-07-06 | Linear array probe for photoacoustic imaging with array element frequency changing along with gradient |
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| Publication Number | Publication Date |
|---|---|
| CN215191757U true CN215191757U (en) | 2021-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121520154.5U Active CN215191757U (en) | 2021-07-06 | 2021-07-06 | Linear array probe for photoacoustic imaging with array element frequency changing along with gradient |
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| Country | Link |
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| CN (1) | CN215191757U (en) |
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2021
- 2021-07-06 CN CN202121520154.5U patent/CN215191757U/en active Active
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Effective date of registration: 20231008 Address after: 055450 North Section Road West, Gongxing Street, Baixiang County, Xingtai City, Hebei Province Patentee after: HEBEI AOSUO ELECTRONIC TECHNOLOGY CO.,LTD. Address before: Room 112, building 4, area a, 925 Yecheng Road, Jiading Industrial Zone, Jiading District, Shanghai, 201821 Patentee before: Aosheng (Shanghai) Electronic Technology Co.,Ltd. |
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| TR01 | Transfer of patent right |