Array element arrangement method and system of spherical multi-chip array focused ultrasonic transducer

Abstract

The present invention belongs to the technical field of focused ultrasonic transducers, and discloses an array element arrangement method and system of a spherical multi-piece array focused ultrasonic transducer. The focused ultrasonic transducer can emit a focal area and sound intensity that meet the treatment requirements. The array element arrangement method includes: constructing multiple arrangement areas on the inner spherical surface of a spherical bracket. Construct multiple identical equivalent array element groups, the number of equivalent array element groups is equal to the number of arrangement areas, and the number of mounting holes in each arrangement area is equal to the number of array elements in each equivalent array element group; the number of array elements in each equivalent array element group is equal, the array element eigenfrequency components are the same, and the maximum value of the termination equivalent impedance deviation is less than or equal to the impedance deviation threshold; the maximum value of the array element impedance angle deviation in the same equivalent array element group is less than or equal to the impedance angle deviation threshold. The equivalent array element groups are correspondingly installed in the arrangement area. The present invention also provides an array element arrangement system including an arrangement area construction unit, an equivalent array element group construction unit and an assembly unit.

Description

Technical Field

[0001] The present invention belongs to the technical field of spherical multi-chip array focused ultrasonic transducers, and in particular relates to an array element arrangement method and system of a spherical multi-chip array focused ultrasonic transducer. Background Art

[0002] Spherical multi-chip array focused ultrasonic transducer has the advantage of high transduction efficiency, and therefore has been one of the research hotspots in recent years.

[0003] In practical applications, the focal area and sound intensity generated by the spherical multi-element array focused ultrasound transducer need to meet the treatment requirements. Among them, the factors that affect the size of the focal area include the frequency output by the driving circuit to the ultrasound transducer, the thickness of the array elements in the ultrasound transducer, and the arrangement of multiple array elements on the spherical bracket. That is, the size of the focal area can be controlled by adjusting the frequency, array element thickness, and array element arrangement.

[0004] In order to ensure the treatment effect, in practical applications, the spherical multi-element focused ultrasound transducer is generally required to have a fixed output frequency. Therefore, the method of controlling the focal size by adjusting the frequency is not suitable for application scenarios that require fixed frequency output. After the array element is assembled, the thickness of the array element is a fixed value. Therefore, the size of the focal area cannot be controlled by adjusting the thickness of the array element.

[0005] In view of this, it is urgent to propose a method for designing array element arrangement so that the ultrasonic transducer can emit a focal area and sound intensity that meet the treatment needs, and at the same time, avoid the ultrasonic transducer from being too large in size to reduce the design and driving burden. Summary of the invention

[0006] The purpose of the present invention is to provide an array element arrangement method and system for a spherical multi-piece array focused ultrasonic transducer. First, an arrangement area is constructed on the inner spherical surface of a spherical bracket according to the arrangement principle established by the present invention. Secondly, multiple identical equivalent array element groups are constructed. Finally, the equivalent array element groups are assembled one by one to the corresponding arrangement areas to complete the arrangement of the elements of the spherical multi-piece array focused ultrasonic transducer. The present invention can enable the focused ultrasonic transducer to emit a focal area and sound intensity that meet the treatment requirements through an optimized arrangement method, and at the same time, it can avoid the over-large size of the focused ultrasonic transducer, as well as the difficulty of designing, assembling and driving the water bag assembled therewith and the driving device that drives its movement due to the over-large size.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] In a first aspect, the present invention provides an array element arrangement method of a spherical multi-chip array focused ultrasonic transducer, wherein the spherical multi-chip array focused ultrasonic transducer comprises a spherical bracket and a plurality of equivalent array element groups distributed on the spherical bracket, and the array element arrangement method comprises the following steps:

[0009] S10. Constructing a plurality of arrangement areas on the inner spherical surface of the spherical bracket; specifically comprising the following sub-steps:

[0010] S100. Determine the target tissue data, and determine the focal area size and treatment depth based on the target tissue data; wherein the target tissue data includes the position coordinates, volume and depth from the epidermis; the focal area size includes the focal area diameter and focal area height;

[0011] S101. Determine the total area of ​​the inner spherical surface of the spherical bracket based on the focal size and treatment depth;

[0012] S102. Evenly divide the inner spherical surface into a plurality of sectors;

[0013] S103. Configure the effective emission area and element diameter of the inner sphere, and determine the number of elements and the spacing between adjacent elements according to the effective emission area and element diameter;

[0014] S104. Determine the number of circles on the inner sphere for arranging the array elements according to the number of array elements, determine the position of the concentric circles corresponding to each circle and the arc segments of the concentric circles truncated by the sectors based on the principle of equal radial spacing between adjacent circles, and determine the position and number of the mounting holes based on the arc length of the arc segment and the array element spacing;

[0015] S105. Determine the arrangement principle for dividing the arrangement area for each sector; the arrangement principle is: when the number of mounting holes located on the arc segment is greater than or equal to the number of array elements in the equivalent array element group, the arrangement area is divided according to the principle of being in the same arc segment and adjacent to each other; when the number of mounting holes located on the arc segment is less than the number of array elements in the equivalent array element group, the arrangement area is divided according to the principle of being adjacent to each other and adjacent to each other; the number of mounting holes in each arrangement area is equal;

[0016] S11. Construct multiple identical equivalent array element groups, the number of equivalent array element groups is equal to the number of arrangement areas, the number of mounting holes in each arrangement area is equal to the number of array elements in each equivalent array element group; the number of array elements in each equivalent array element group is equal, the array element eigenfrequency components are the same, and the maximum value of the termination equivalent impedance deviation is less than or equal to the impedance deviation threshold; the maximum value of the array element impedance angle deviation in the same equivalent array element group is less than or equal to the impedance angle deviation threshold;

[0017] S12. Install an equivalent array element group in a corresponding arrangement area.

[0018] As a possible implementation method, S101 specifically includes the following steps:

[0019] S1010. Calculate the focal angle based on the focal area diameter;

[0020] S1011. Calculate the total area of ​​the inner sphere based on the treatment depth and the focus angle;

[0021] As a possible implementation manner, the chord length of the arc formed by the projection of the inner sphere on the two-dimensional plane is calculated based on the treatment depth and the focal angle, and the chord length is defined as the opening diameter of the focused ultrasound transducer.

[0022] As a possible implementation method, the focusing angle is obtained as follows:

[0023] D=0.71λ / sin(α)

[0024] Wherein, D is the focal diameter, λ is the wavelength of ultrasound, α is the focusing angle, D and λ are known quantities, and α is an unknown quantity.

[0025] As a possible implementation method, multiple identical equivalent array tuples are constructed. For each equivalent array tuple, the construction method is as follows:

[0026] Construct fine screening array elements, determine the number of fine screening array element groups, the number of fine screening array element groups is less than or equal to the number of equivalent array element groups; one group of fine screening array elements corresponds to one eigenfrequency, different groups of fine screening array elements correspond to different eigenfrequencies, and the maximum value of the eigenfrequency deviation between different groups of fine screening array elements is less than or equal to the eigenfrequency deviation threshold; the number of array elements in each fine screening array element group is greater than or equal to the sum of the number of array elements selected from the corresponding fine screening array element group in all equivalent array element groups;

[0027] Determining the number of array elements required in the equivalent array element group;

[0028] At least one array element is selected from each fine screening array element group, and the total number of array elements selected from all fine screening array elements is equal to the number of array elements required in the equivalent array element group; the equivalent array element group is composed of multiple array elements selected from the fine screening array element groups corresponding to different eigenfrequencies.

[0029] As a possible implementation manner, the termination equivalent impedance is determined by the impedance and connection relationship of the array elements in the equivalent array element group.

[0030] As a possible implementation, the termination equivalent impedance is determined as follows:

[0031] When the array elements in the equivalent array element group are connected in series, the equivalent impedance is the total impedance of all array elements in series;

[0032] When the array elements in the equivalent array element group are connected in parallel, the equivalent impedance is the total parallel impedance of all array elements;

[0033] When the array elements in the equivalent array element group are mixed, the equivalent impedance is the total mixed impedance of all array elements.

[0034] As a possible implementation, the impedance deviation threshold is no greater than 10Ω; the impedance angle deviation threshold is no greater than 20°; and the eigenfrequency deviation threshold is no greater than 50kHz.

[0035] As a possible implementation method, the focal area size is 1.1mm*1.1mm*8mm~2.5mm*2.5mm*12.5mm; the radius of the inner spherical surface is 15~30cm; and the focusing angle is 10~60°.

[0036] In a second aspect, the present invention further provides an array element arrangement system of a spherical multi-chip array focused ultrasonic transducer, comprising:

[0037] The arrangement area construction unit is used to construct a plurality of arrangement areas on the inner spherical surface of the spherical bracket. The arrangement area construction unit specifically performs the following steps:

[0038] S100. Determine the target tissue data, and determine the focal area size and treatment depth based on the target tissue data; wherein the target tissue data includes the position coordinates, volume and depth from the epidermis; the focal area size includes the focal area diameter and focal area height;

[0039] S101. Determine the total area of ​​the inner spherical surface of the spherical bracket based on the focal size and treatment depth;

[0040] S102. Evenly divide the inner spherical surface into a plurality of sectors;

[0041] S103. Configure the effective emission area and element diameter of the inner sphere, and determine the number of elements and the spacing between adjacent elements according to the effective emission area and element diameter;

[0042] S104. Determine the number of circles on the inner sphere for arranging the array elements according to the number of array elements, determine the position of the concentric circles corresponding to each circle and the arc segments of the concentric circles truncated by the sectors based on the principle of equal radial spacing between adjacent circles, and determine the position and number of the mounting holes based on the arc length of the arc segment and the array element spacing;

[0043] S105. Determine the arrangement principle for dividing the arrangement area for each sector; the arrangement principle is: when the number of mounting holes located on the arc segment is greater than or equal to the number of array elements in the equivalent array element group, the arrangement area is divided according to the principle of being in the same arc segment and adjacent to each other; when the number of mounting holes located on the arc segment is less than the number of array elements in the equivalent array element group, the arrangement area is divided according to the principle of being adjacent to each other and adjacent to each other; the number of mounting holes in each arrangement area is equal;

[0044] An equivalent array element group construction unit, the equivalent array element group construction unit is used to construct multiple identical equivalent array element groups, the number of equivalent array element groups is equal to the number of arrangement areas, the number of mounting holes in each arrangement area is equal to the number of array elements in each equivalent array element group; the number of array elements in each equivalent array element group is equal, the array element intrinsic frequency components are the same, and the maximum value of the termination equivalent impedance deviation is less than or equal to the impedance deviation threshold; the maximum value of the array element impedance angle deviation in the same equivalent array element group is less than or equal to the impedance angle deviation threshold

[0045] And an assembly unit, the assembly unit is used to install the equivalent array element groups correspondingly in the arrangement area.

[0046] Compared with the prior art, the present invention has the following effects:

[0047] 1. The present invention proposes a method for determining the area of ​​the inner spherical surface of a spherical bracket based on the focal zone size and treatment depth parameters, and then determining the number of array elements and the spacing between array elements based on the effective emission area of ​​the inner spherical surface area, the diameter of the array element, etc. Based on this, the number of array element arrangement circles on the inner spherical surface and the radial spacing between adjacent circles can be determined. The inner spherical surface is evenly divided into multiple sectors, and the arrangement area is reasonably determined for each sector according to the arrangement principle. The arrangement area determined by the above method can make the array element arrangement more reasonable on a limited inner spherical surface area, that is, it can emit a focal zone that meets the treatment needs and the sound intensity distributed in the vicinity of the focal zone.

[0048] 2. When the size of the spherical bracket is too large, the size of the water bag assembled with it also needs to be increased accordingly. At this time, the load on the driving device increases. The arrangement area determined by the arrangement method provided by the present invention can avoid the problem of the spherical bracket being too large while emitting a focal area and sound intensity that meet the treatment requirements, thereby reducing the load on the driving device.

[0049] 3. After obtaining the fine-screened array element group, multiple identical equivalent array element groups are constructed, and the equivalent array element group is composed of multiple array elements selected from the fine-screened array element group corresponding to different eigenfrequencies. The array elements in the equivalent array element group have the same eigenfrequency components, the same termination equivalent impedance, and the impedance angle within the preset deviation range. In practical applications, the consistency of the output characteristic parameters of each equivalent array element group can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0051] Figure 1 A flow chart of an array element arrangement method of a spherical multi-chip array focused ultrasonic transducer provided in an embodiment of the present invention;

[0052] Figure 2 A schematic diagram of determining the inner spherical surface area based on the focal zone size when constructing the arrangement area provided in an embodiment of the present invention;

[0053] Figure 3 A distribution diagram of the arrangement areas on the inner spherical surface provided by an embodiment of the present invention;

[0054] Figure 4 A schematic diagram of the structure of a spherical bracket with 6 circles of mounting holes provided in an embodiment of the present invention;

[0055] Figure 5 A schematic diagram of the structure of a spherical bracket with 6 circles of mounting holes provided in an embodiment of the present invention after an array element is installed;

[0056] Figure 6 A schematic diagram of the structure of a spherical bracket with three circles of mounting holes provided in an embodiment of the present invention;

[0057] Figure 7 A block diagram of the array element arrangement system of a spherical multi-element array focused ultrasonic transducer provided in an embodiment of the present invention.

[0058] Reference numerals:

[0059] 1-spherical bracket, 10-arrangement area, 11-mounting hole; 2-array element. DETAILED DESCRIPTION

[0060] In order to clearly describe the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, words such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and effects. For example, the first threshold and the second threshold are only used to distinguish different thresholds, and their order is not limited. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit them to be different.

[0061] It should be noted that, in the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0062] In the present invention, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b and c, where a, b, c can be single or multiple.

[0063] First, see Figures 1 to 6 The embodiment of the present invention provides an array element arrangement method of a spherical multi-chip array focused ultrasonic transducer. The spherical multi-chip array focused ultrasonic transducer includes a spherical bracket 1 and a plurality of equivalent array element groups distributed on the spherical bracket 1. The array element arrangement method includes the following steps:

[0064] S10. Constructing a plurality of arrangement areas 10 on the inner spherical surface of the spherical bracket 1; specifically comprising the following sub-steps:

[0065] S100. Determine the target tissue data, and determine the focal area size and treatment depth based on the target tissue data; wherein the target tissue data includes the position coordinates, volume and depth from the epidermis; the focal area size includes the focal area diameter and focal area height;

[0066] S101. Determine the total area of ​​the inner spherical surface of the spherical bracket 1 based on the focal zone size and the treatment depth. Specifically, the steps include:

[0067] S1010. Obtain a focal angle by calculating a focal area diameter determined based on the focal area size.

[0068] S1011. Calculate the total area of ​​the inner sphere based on the treatment depth and the focal angle.

[0069] The chord length of the arc formed by the projection of the inner sphere on the two-dimensional plane can also be calculated based on the treatment depth and the focal angle, and the chord length is defined as the opening diameter of the focused ultrasound transducer.

[0070] S102. Evenly divide the inner spherical surface into a plurality of sectors; as an example, evenly divide the inner spherical surface into an even number of sectors, such as 4, 6, 8, 10 or 12 sectors, which is not specifically limited here.

[0071] S103. Configure the effective emission area of ​​the inner sphere and the diameter of the array element, and determine the number of array elements and the spacing between adjacent array elements 2 according to the effective emission area and the diameter of the array element. As an example, the number of array elements 2 can be selected in the range of 50 to 500; the spacing between array elements 2 ranges from 2 to 6 mm. The effective emission area is the sum of the areas of all array elements, and the effective emission area is determined according to the actual application scenario, and is not specifically limited here.

[0072] As an example, see Figure 2 , the focal diameter is defined as D, the focal angle is defined as α, the treatment depth, that is, the inner spherical radius is defined as R, a is half the chord length, and is also the opening radius; the number of array elements is N, and the spacing between adjacent array elements is defined as B. Among them, D and α satisfy the following formula:

[0073] D=0.71λ / sin(α)

[0074] Among them, λ is the ultrasonic wavelength; in the above formula, D and λ are known numbers, and α can be solved by solving the above formula.

[0075] After solving for α, based on R, we can solve for half of the chord length a, which is the opening diameter mentioned above.

[0076] S104. Determine the number of circles on the inner sphere for arranging the array elements 2 based on the number of array elements. Based on the principle that the radial spacing between adjacent circles is equal, determine the position of the concentric circles corresponding to each circle and the arc segments of the concentric circles truncated by the sectors. Determine the position and number of the mounting holes 11 based on the arc length of the arc segments and the spacing between the array elements 2.

[0077] As an example, the number of turns is preferably 3 to 10, specifically 3 turns, 4 turns ... 10 turns. When the area of ​​the inner spherical surface of the spherical bracket 1 is large, the number of turns may not be limited to 10, but may be more.

[0078] S105. Determine an arrangement principle for dividing the arrangement area 10 for each sector; the arrangement principle is: when the number of mounting holes 11 located on the arc segment is greater than or equal to the number of array elements in the equivalent array element group, the arrangement area 10 is divided according to the principle of being in the same arc segment and adjacent to each other; when the number of mounting holes 11 located on the arc segment is less than the number of array elements in the equivalent array element group, the arrangement area 10 is divided according to the principle of being in adjacent arc segments and adjacent to each other; the number of mounting holes 11 in each arrangement area 10 is equal.

[0079] See also Figure 3 , taking 198 mounting holes 11, 6 circles, 6 sectors, and 6 mounting holes 11 evenly distributed in each arrangement area 10 as an example, the method for determining the arrangement area 10 is described in detail. It should be understood that the following examples are only for explanatory purposes and are not intended to be limiting.

[0080] There are six circles of mounting holes 11 distributed from the edge to the center on the inner sphere, which are defined as the first circle, the second circle, the third circle, the fourth circle, the fifth circle and the sixth circle. Among them, there are 48 mounting holes 11 distributed in the first circle, 42 mounting holes 11 distributed in the second circle, 36 mounting holes 11 distributed in the third circle, 30 mounting holes 11 distributed in the fourth circle, 24 mounting holes 11 distributed in the fifth circle, and 18 mounting holes 11 distributed in the sixth circle.

[0081] For the mounting holes 11 of the first circle, 6 are grouped together, and they are evenly divided into 8 groups. For the mounting holes 11 of the second circle, 7 are grouped together, and they are evenly divided into 6 groups. It needs to be further explained that there are 7 mounting holes 11 distributed in each arrangement area 10 of the second circle. In actual applications, the mounting holes 11 located in the middle are invalid mounting holes 11, that is, the mounting holes 11 in the middle do not install array elements 2, so that the number of array elements 2 installed in each arrangement area 10 remains consistent, that is, they are all 6. There are 6 corresponding sectors, that is, the sectors are divided from the second circle. For the mounting holes 11 of the third circle, 6 are grouped together, and they are evenly divided into 6 groups. For the fourth circle, in each sector, 4 are grouped together, and the remaining 2 are taken from the fifth circle and the sixth circle respectively, forming a total of 6 mounting holes 11 in a group. For the fifth circle, in each sector, after the remaining three mounting holes 11 are divided from the fifth circle, one mounting hole 11 is taken from the fourth circle, and two mounting holes 11 are taken from the sixth circle, forming a total of six mounting holes 11 in a group. At this point, the 198 mounting holes 11 are divided into 32 groups of arrangement areas 10 according to the above rules.

[0082] S11. Construct a plurality of identical equivalent array element groups, wherein the number of equivalent array element groups is equal to the number of arrangement areas 10, the number of effective mounting holes 11 in each arrangement area 10 is equal to the number of array elements 2 in each equivalent array element group; the number of array elements in each equivalent array element group is equal, the array element intrinsic frequency components are the same, and the maximum value of the termination equivalent impedance deviation is less than or equal to the impedance deviation threshold; the maximum value of the array element impedance angle deviation in the same equivalent array element group is less than or equal to the impedance angle deviation threshold;

[0083] S110. Construct fine screening array element groups, determine the number of fine screening array element groups, the number of fine screening array element groups is less than or equal to the number of equivalent array element groups; one group of fine screening array element groups corresponds to one eigenfrequency, different groups of fine screening array element groups correspond to different eigenfrequencies, and the maximum value of the eigenfrequency deviation between different groups of fine screening array element groups is less than or equal to the eigenfrequency deviation threshold; the number of array elements in each of the fine screening array element groups is greater than or equal to the sum of the number of array elements selected from the corresponding fine screening array element groups in all equivalent array element groups;

[0084] S111. Determine the number of array elements 2 required in the equivalent array element group;

[0085] S112. Select at least one array element 2 from each of the fine screening array element groups, and the total number of array elements selected from all the fine screening array elements is equal to the number of array elements required in the equivalent array element group; an equivalent array element group is composed of multiple array elements 2 selected from the fine screening array element groups corresponding to different eigenfrequencies.

[0086] As an example, see Figure 6 , taking 3 circles of mounting holes 11, 30 mounting holes 11 are distributed in the outer circle, 24 mounting holes 11 are distributed in the middle circle, and 18 mounting holes 11 are distributed in the inner circle as an example to explain the method of constructing 2 groups of equivalent array elements. The 6 mounting holes 11 in each circle form a group. At this time, there are 5 groups distributed in the outer circle, 4 groups distributed in the middle circle, and 3 groups distributed in the inner circle, totaling 12 groups of arrangement areas 10, corresponding to the need to construct 12 groups of equivalent array element groups. The number of array elements 2 required in each equivalent array element group is 6. At this time, for each equivalent matrix, 1 array element 2 can be selected from the 1.049MHz eigenfrequency, 1 array element 2 can be selected from the 1.050MHz eigenfrequency, 2 array elements 2 can be selected from the 1.051MHz eigenfrequency, 1 array element 2 can be selected from the 1.052MHz eigenfrequency, and 1 array element 2 can be selected from the 1.053MHz eigenfrequency.

[0087] It needs to be further explained that the 1.049MHz eigenfrequency includes at least 12 array elements 2, the 1.050MHz eigenfrequency includes at least 12 array elements 2, the 1.051MHz eigenfrequency includes at least 24 array elements 2, the 1.052MHz eigenfrequency includes at least 12 array elements 2, and the 1.053MHz eigenfrequency includes at least 12 array elements 2. At this time, the specific selection of which array element 2 corresponds to each eigenfrequency in each equivalent array element 2 group needs to comprehensively consider the short-circuit equivalent impedance deviation of the equivalent array element 2 group and whether the impedance angle is less than 20°.

[0088] The array elements in each group of equivalent array elements are connected in parallel in actual applications, and the final 12 groups of equivalent array elements are as follows:

[0089] Table 1 The first group of equivalent array elements

[0090]

[0091]

[0092] Table 2 The second group of equivalent array elements

[0093]

[0094] Table 3 The third group of equivalent matrix elements

[0095]

[0096] Table 4 The fourth group of equivalent array elements

[0097]

[0098] Table 5 The fifth group of equivalent array elements

[0099]

[0100] Table 6 The sixth group of equivalent array elements

[0101]

[0102] Table 7 The seventh group of equivalent array elements

[0103]

[0104] Table 8 The eighth group of equivalent array elements

[0105]

[0106]

[0107] Table 9 The ninth group of equivalent array elements

[0108]

[0109] Table 10 The tenth group of equivalent array elements

[0110]

[0111] Table 11 Eleventh group of equivalent array elements

[0112]

[0113] Table 12 The twelfth group of equivalent array elements

[0114]

[0115]

[0116] S12. See Figure 5 , an equivalent array element group is correspondingly installed in an arrangement area 10. As an example, the array element 2 in the equivalent array element group is randomly installed in the corresponding arrangement area 10.

[0117] As a possible implementation, the impedance deviation threshold is no greater than 10Ω; the impedance angle deviation threshold is no greater than 20°; and the eigenfrequency deviation threshold is no greater than 50 kHz.

[0118] In the above example, the maximum termination equivalent impedance error of 12 groups is less than the preset threshold (the preset threshold is 10Ω). In this data, the maximum short-circuit equivalent impedance error is 0.586Ω, which is less than the preset threshold of 10Ω. The impedance angle is less than 20°.

[0119] As a possible implementation, the focal area size is 1.1mm*1.1mm*8mm~2.5mm*2.5mm*12.5mm; the radius of the inner spherical surface is 15~30cm; and the focusing angle is 10~60°.

[0120] As a possible implementation manner, the array elements in each equivalent array element group have the same eigenfrequency component, the same termination equivalent impedance and an impedance angle within a preset deviation range; the termination equivalent impedance is determined by the impedance and connection relationship of the array elements in the equivalent array element group.

[0121] As a possible implementation, the termination equivalent impedance is determined as follows:

[0122] When the array elements in the equivalent array element group are connected in series, the equivalent impedance is the total impedance of all array elements in series;

[0123] When the array elements in the equivalent array element group are connected in parallel, the equivalent impedance is the total parallel impedance of all array elements;

[0124] When the array elements in the equivalent array element group are mixed, the equivalent impedance is the total mixed impedance of all array elements.

[0125] Second, see Figure 7 The present invention also provides an array element arrangement system of a spherical multi-chip array focused ultrasonic transducer, the array element arrangement system comprising:

[0126] The arrangement area construction unit is used to construct a plurality of arrangement areas on the inner spherical surface of the spherical bracket. The arrangement area construction unit specifically performs the following steps:

[0127] S100. Determine the target tissue data, and determine the focal area size and treatment depth based on the target tissue data; wherein the target tissue data includes the position coordinates, volume and depth from the epidermis; the focal area size includes the focal area diameter and focal area height;

[0128] S101. Determine the total area of ​​the inner spherical surface of the spherical bracket based on the focal size and treatment depth;

[0129] S102. Evenly divide the inner spherical surface into a plurality of sectors;

[0130] S103. Configure the effective emission area and element diameter of the inner sphere, and determine the number of elements and the spacing between adjacent elements according to the effective emission area and element diameter;

[0131] S104. Determine the number of circles on the inner sphere for arranging the array elements according to the number of array elements, determine the position of the concentric circles corresponding to each circle and the arc segments of the concentric circles truncated by the sectors based on the principle of equal radial spacing between adjacent circles, and determine the position and number of the mounting holes based on the arc length of the arc segment and the array element spacing;

[0132] S105. Determine the arrangement principle for dividing the arrangement area for each sector; the arrangement principle is: when the number of mounting holes located on the arc segment is greater than or equal to the number of array elements in the equivalent array element group, the arrangement area is divided according to the principle of being in the same arc segment and adjacent to each other; when the number of mounting holes located on the arc segment is less than the number of array elements in the equivalent array element group, the arrangement area is divided according to the principle of being adjacent to each other and adjacent to each other; the number of mounting holes in each arrangement area is equal;

[0133] An equivalent array element group construction unit, the equivalent array element group construction unit is used to construct multiple identical equivalent array element groups, the number of equivalent array element groups is equal to the number of arrangement areas, the number of mounting holes in each arrangement area is equal to the number of array elements in each equivalent array element group; the number of array elements in each equivalent array element group is equal, the array element intrinsic frequency components are the same, and the maximum value of the termination equivalent impedance deviation is less than or equal to the impedance deviation threshold; the maximum value of the array element impedance angle deviation in the same equivalent array element group is less than or equal to the impedance angle deviation threshold

[0134] And an assembly unit, the assembly unit is used to install the equivalent array element groups correspondingly in the arrangement area.

[0135] Compared with the prior art, the present invention has the following effects:

[0136] 1. The present invention proposes a method for determining the area of ​​the inner spherical surface of a spherical bracket based on the focal zone size and treatment depth parameters, and then determining the number of array elements and the spacing between array elements based on the effective emission area of ​​the inner spherical surface area, the diameter of the array element, etc. Based on this, the number of array element arrangement circles on the inner spherical surface and the radial spacing between adjacent circles can be determined. The inner spherical surface is evenly divided into multiple sectors, and the arrangement area is reasonably determined for each sector according to the arrangement principle. The arrangement area determined by the above method can make the array element arrangement more reasonable on a limited inner spherical surface area, that is, it can emit a focal zone that meets the treatment needs and the sound intensity distributed in the vicinity of the focal zone.

[0137] 2. When the size of the spherical bracket is too large, the size of the water bag assembled with it also needs to be increased accordingly. At this time, the load on the driving device increases. The arrangement area determined by the arrangement method provided by the present invention can avoid the problem of the spherical bracket being too large while emitting a focal area and sound intensity that meet the treatment requirements, thereby reducing the load on the driving device.

[0138] 3. After obtaining the fine-screened array element group, multiple identical equivalent array element groups are constructed, and the equivalent array element group is composed of multiple array elements selected from the fine-screened array element group corresponding to different eigenfrequencies. The array elements in the equivalent array element group have the same eigenfrequency components, the same termination equivalent impedance, and the impedance angle within the preset deviation range. In practical applications, the consistency of the output characteristic parameters of each equivalent array element group can be ensured.

[0139] Although the present invention is described herein in conjunction with various embodiments, in the process of implementing the claimed invention, those skilled in the art may understand and implement other variations of the disclosed embodiments by viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "one" or "an" does not exclude multiple situations. A single processor or other unit may implement several functions listed in the claims. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0140] Although the present invention has been described in conjunction with specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the present invention. Accordingly, this specification and the accompanying drawings are merely exemplary illustrations of the present invention as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present invention. Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, the present invention is intended to include such modifications and variations if they fall within the scope of the claims of the present invention and their equivalents.

Claims

1. A method for arranging array elements of a spherical multi-chip array focused ultrasonic transducer, characterized in that: The spherical multi-chip array focused ultrasonic transducer comprises a spherical bracket and a plurality of equivalent array element groups distributed on the spherical bracket, and the array element arrangement method comprises the following steps: S10. Constructing a plurality of arrangement areas on the inner spherical surface of the spherical bracket; specifically comprising the following sub-steps: S100. Determine the target tissue data, and determine the focal area size and treatment depth based on the target tissue data; wherein the target tissue data includes position coordinates, volume, and depth from the epidermis; the focal area size includes focal area diameter and focal area height; S101. Determine the total area of ​​the inner spherical surface of the spherical bracket based on the focal zone size and the treatment depth, specifically including: S1010. Calculate the focal angle based on the focal zone diameter: D = 0.71λ / sin(α), Where D is the focal diameter, λ is the wavelength of ultrasound, and α is the focusing angle; S1011. Calculate the total area of ​​the inner spherical surface based on the treatment depth and the focal angle; S102. Evenly divide the inner spherical surface into a plurality of sectors; S103. Configure the effective emission area and the array element diameter of the inner sphere, and determine the number of array elements and the spacing between adjacent array elements according to the effective emission area and the array element diameter; S104. Determine the number of circles on the inner spherical surface for arranging the array elements according to the number of array elements, determine the position of the concentric circles corresponding to each circle and the arc segments of the concentric circles truncated by the sectors based on the principle that the radial spacing between adjacent circles is equal, and determine the position and number of the mounting holes based on the arc length of the arc segment and the array element spacing; S105. Determine an arrangement principle for dividing the arrangement area for each sector; the arrangement principle is: when the number of mounting holes on the arc segment is greater than or equal to the number of array elements in the equivalent array element group, the arrangement area is divided according to the principle of being in the same arc segment and adjacent to each other; when the number of mounting holes on the arc segment is less than the number of array elements in the equivalent array element group, the arrangement area is divided according to the principle of being in adjacent arc segments and adjacent to each other; the number of mounting holes in each arrangement area is equal; S11. Construct a plurality of identical equivalent array element groups, wherein the number of equivalent array element groups is equal to the number of arrangement areas, the number of mounting holes in each arrangement area is equal to the number of array elements in each equivalent array element group; the number of array elements in each equivalent array element group is equal, the array element eigenfrequency components are the same, the maximum value of the termination equivalent impedance deviation is less than or equal to the impedance deviation threshold; the maximum value of the array element impedance angle deviation in the same equivalent array element group is less than or equal to the impedance angle deviation threshold; S12. Install one of the equivalent array element groups in a corresponding arrangement area.

2. The array element arrangement method of the spherical multi-chip array focused ultrasonic transducer according to claim 1, characterized in that: The chord length of the arc formed by the projection of the inner sphere on the two-dimensional plane is calculated based on the treatment depth and the focal angle, and the chord length is defined as the opening diameter of the focused ultrasound transducer.

3. The array element arrangement method of the spherical multi-chip array focused ultrasonic transducer according to claim 1, characterized in that: Construct multiple identical equivalent array tuples. For each of the equivalent array tuples, the construction method is as follows: Construct fine screening array element groups, determine the number of fine screening array element groups, the number of fine screening array element groups is less than or equal to the number of equivalent array element groups; one group of fine screening array element groups corresponds to one eigenfrequency, different groups of fine screening array element groups correspond to different eigenfrequencies, and the maximum value of the eigenfrequency deviation between different groups of fine screening array element groups is less than or equal to the eigenfrequency deviation threshold; the number of array elements in each of the fine screening array element groups is greater than or equal to the sum of the number of array elements selected from the corresponding fine screening array element groups in all equivalent array element groups; Determining the number of array elements required in the equivalent array element group; At least one array element is selected from each of the fine screening array element groups, and the total number of array elements selected from all the fine screening array elements is equal to the number of array elements required in the equivalent array element group; an equivalent array element group is composed of multiple array elements selected from the fine screening array element groups corresponding to different eigenfrequencies.

4. The array element arrangement method of the spherical multi-chip array focused ultrasonic transducer according to claim 3, characterized in that: The termination equivalent impedance is determined by the impedance and connection relationship of the array elements in the equivalent array element group.

5. The array element arrangement method of the spherical multi-chip array focused ultrasonic transducer according to claim 4, characterized in that: The termination equivalent impedance is determined as follows: When the array elements in the equivalent array element group are connected in series, the equivalent impedance is the total impedance of all array elements connected in series; When the array elements in the equivalent array element group are connected in parallel, the equivalent impedance is the total parallel impedance of all array elements; When the array elements in the equivalent array element group are mixed in series, the equivalent impedance is the total impedance of all the array elements in series.

6. The method for arranging array elements of a spherical multi-chip array focused ultrasonic transducer according to claim 1, characterized in that: The impedance deviation threshold is no greater than 10Ω; the impedance angle deviation threshold is no greater than 20°; and the intrinsic frequency deviation threshold is no greater than 50kHz.

7. The array element arrangement method of the spherical multi-chip array focused ultrasonic transducer according to claim 1, characterized in that: The focal area size is 1.1mm﹡1.1mm﹡8mm~2.5mm﹡2.5mm﹡12.5mm; the radius of the inner spherical surface is 15~30cm; and the focusing angle is 10~60°.

8. An array element arrangement system of a spherical multi-chip array focused ultrasonic transducer, characterized in that: include: The arrangement area construction unit is used to construct a plurality of arrangement areas on the inner spherical surface of the spherical bracket, and the arrangement area construction unit specifically performs the following steps: S100. Determine the target tissue data, and determine the focal area size and treatment depth based on the target tissue data; wherein the target tissue data includes position coordinates, volume, and depth from the epidermis; the focal area size includes focal area diameter and focal area height; S101. Determine the total area of ​​the inner spherical surface of the spherical bracket based on the focal zone size and the treatment depth, specifically including: S1010. Calculate the focal angle based on the focal zone diameter: D = 0.71λ / sin(α), Wherein, D is the focal diameter, λ is the wavelength of the ultrasound wave, and α is the focal angle; S1011. Calculate the total area of ​​the inner spherical surface based on the treatment depth and the focal angle; S102. Evenly divide the inner spherical surface into a plurality of sectors; S103. Configure the effective emission area and the array element diameter of the inner sphere, and determine the number of array elements and the spacing between adjacent array elements according to the effective emission area and the array element diameter; S104. Determine the number of circles on the inner spherical surface for arranging the array elements according to the number of array elements, determine the position of the concentric circles corresponding to each circle and the arc segments of the concentric circles truncated by the sectors based on the principle that the radial spacing between adjacent circles is equal, and determine the position and number of the mounting holes based on the arc length of the arc segment and the array element spacing; S105. Determine an arrangement principle for dividing the arrangement area for each sector; the arrangement principle is: when the number of mounting holes on the arc segment is greater than or equal to the number of array elements in the equivalent array element group, the arrangement area is divided according to the principle of being in the same arc segment and adjacent to each other; when the number of mounting holes on the arc segment is less than the number of array elements in the equivalent array element group, the arrangement area is divided according to the principle of being in adjacent arc segments and adjacent to each other; the number of mounting holes in each arrangement area is equal; An equivalent array element group construction unit, wherein the equivalent array element group construction unit is used to construct a plurality of identical equivalent array element groups, wherein the number of equivalent array element groups is equal to the number of arrangement areas, the number of mounting holes in each arrangement area is equal to the number of array elements in each equivalent array element group; the number of array elements in each equivalent array element group is equal, the array element intrinsic frequency components are the same, and the maximum value of the termination equivalent impedance deviation is less than or equal to the impedance deviation threshold value; the maximum value of the array element impedance angle deviation in the same equivalent array element group is less than or equal to the impedance angle deviation threshold value and an assembly unit, wherein the assembly unit is used to install the equivalent array element groups correspondingly in the arrangement area.

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