Layered fat melting technology and system and storage medium

Abstract

The invention discloses a layered fat melting technology and system and a storage medium. The layered fat melting technology comprises the following steps that three-dimensional body surface data and subcutaneous tissue data are obtained; based on the three-dimensional body surface data and the subcutaneous tissue data, constructing a three-dimensional model comprising a body surface form and a subcutaneous fat layer; dividing the subcutaneous fat area of the layer to be subjected to fat melting into a plurality of fat layers with different depths along the body surface normal direction of the three-dimensional model; and based on each fat depth, selecting laser with a corresponding focal length to carry out fat melting operation until fat melting is completed. According to the scheme, fat layers with different depths are divided in the body surface normal direction of the three-dimensional model, the corresponding focal length laser is matched according to the depth of each layer to carry out operation, and subcutaneous fat depth differences of different individuals and different parts can be accurately adapted. According to the invention, fat layers with different depths can obtain adaptive laser energy without depending on long-time constant-power irradiation, so that the equipment operation cost is reduced, and the problems of insufficient energy of deep fat and excessive energy of shallow fat are avoided.

Description

Technical Field

[0001] This invention relates to the field of non-invasive human tissue heating / fat reduction technology, belonging to the optical and control technology of medical / home beauty devices, and more specifically, to a layered fat melting technology, system and storage medium. Background Technology

[0002] Most existing non-invasive liposuction techniques use fixed-depth facial irradiation or spot scanning for liposuction. However, the depth of subcutaneous fat varies among individuals and in different body parts, making it impossible to adjust the laser energy appropriately based on these differences. To target deep fat, it is often necessary to maintain a constant laser power for an extended period. This not only increases equipment operating costs but also easily leads to insufficient energy for deep fat and excessive energy for superficial fat, ultimately failing to achieve the desired liposuction effect. Summary of the Invention

[0003] This invention provides a layered fat melting technique, comprising the following steps: Acquire three-dimensional body surface data and subcutaneous tissue data; Based on three-dimensional body surface data and subcutaneous tissue data, a three-dimensional model including body surface morphology and subcutaneous fat layer is constructed. Along the surface normal of the 3D model, the subcutaneous fat region of the fat layer to be melted is divided into several fat layers of different depths. The laser with the corresponding focal length is selected based on the depth of each fat layer to perform the fat reduction operation until the fat reduction is completed.

[0004] Furthermore, the steps for constructing a three-dimensional model that includes the body surface morphology and subcutaneous fat layer include: Three-dimensional body surface data is acquired using a ToF depth camera, and an initial three-dimensional model is constructed based on the three-dimensional body surface data. Data on subcutaneous tissue, including subcutaneous fat, is acquired using millimeter-wave radar. Subcutaneous tissue data is mapped onto an initial 3D model to form a 3D model that includes the body surface morphology and subcutaneous fat layer.

[0005] Furthermore, the step of dividing the fat layer to be melted into several fat layers of different depths includes: Obtain the fat volume unit that reaches the preset minimum thermal dose under single-point laser action conditions, and use the thickness of the fat volume unit as the thickness of the minimum fat unit. The thickness of a single fat layer is calculated based on the thickness of the smallest fat unit. The interlayer spacing between adjacent fat layers is calculated based on the thickness of the smallest fat unit. By inputting the interlayer spacing and single-layer thickness into the 3D model, multiple continuous fat layers along the normal direction of the body surface are obtained.

[0006] Further steps in performing fat melting include: Mesh the 3D model based on the size of the smallest fat unit; Data is collected from the first discrete grid using a Poisson disk distribution or a blue noise point distribution; The laser duty cycle and dwell time are determined based on the thickness of the smallest fat unit and the unit grid width of the first discrete grid. Liposuction is performed on the fat layer within the first discrete grid based on the laser duty cycle and dwell time.

[0007] Furthermore, the steps involved in performing fat melting include: After the first discrete mesh completes the melting process, the first discrete mesh is offset by half the mesh length along the X-axis and by half the mesh length along the Y-axis to form the second discrete mesh. The laser duty cycle and dwell time are determined based on the thickness of the smallest fat unit and the unit grid width of the second discrete grid. Liposuction is performed on the fat layer within the second discrete grid based on the laser duty cycle and dwell time.

[0008] Furthermore, during the degreasing operation, the laser duty cycle and dwell time at the edges of the 3D model are less than those in the central region.

[0009] Furthermore, during the degreasing operation, the laser dose within the current grid is monitored in real time. If the laser dose is less than or greater than the preset standard dose, the laser duty cycle and dwell time are immediately corrected and adjusted.

[0010] Further steps for correcting and adjusting the laser duty cycle and dwell time include: Construct a standard dose mapping model; Based on historical experimental samples, establish a mapping relationship between the two-dimensional coordinates of the unit grid, the fat layer depth, the fat layer curvature, the laser incident angle, and the preset standard laser dose, and store the mapping relationship in the standard dose mapping model; Obtain the area, 2D coordinates, fat layer depth, and fat layer curvature of the current cell mesh; Obtain the laser output power, laser duty cycle, dwell time, and laser incident angle acting on the current cell grid; The laser dose of the current cell is calculated based on the laser output power, laser duty cycle, dwell time, and area of ​​the current cell. The current grid's two-dimensional coordinates, fat layer depth, fat layer curvature, and laser incident angle are input into the standard dose mapping model to match and obtain the preset standard laser dose; The laser deviation is calculated by comparing the laser dose with the standard laser dose. The laser duty cycle and dwell time are corrected and adjusted by the laser deviation.

[0011] Furthermore, the steps for selecting a laser with the corresponding focal length to perform the fat reduction procedure include: Obtain the current depth and curvature of the fat layer, and also obtain the current laser incident angle; Input the current fat layer depth, current fat layer curvature and current laser incident angle into the focal length calculation function to calculate the corresponding focal length control parameters; Focusing of the laser is achieved using focal length control parameters.

[0012] Furthermore, the formula for the focal length calculation function is as follows: ; Where z represents the fat layer depth; u represents the focal length control parameter; ρ represents the fat layer curvature; and θ represents the laser incident angle.

[0013] Furthermore, during the fat melting operation, each fat layer is melted in order from deep to shallow.

[0014] Furthermore, during the fat melting process, the fat layers are melted in an alternating sequence. After melting the current fat layer, a fat layer that is offset from the current fat layer is selected for fat melting.

[0015] A layered fat reduction system, comprising: The data acquisition unit is configured to acquire three-dimensional body surface data and subcutaneous tissue data; The model building unit is configured to build a three-dimensional model based on three-dimensional body surface data and subcutaneous tissue data; The depth division unit is configured to divide the fat layer to be melted into several fat layers of different depths along the surface normal direction of the three-dimensional model. The laser irradiation unit is configured to select the corresponding focal length of the laser based on the depth of each fat layer for fat melting.

[0016] Furthermore, the system also includes: The laser dose monitoring unit is configured to monitor the laser dose in the current grid in real time during the grease melting operation. If the laser dose is less than or greater than the preset standard dose, the laser duty cycle and dwell time will be corrected and adjusted immediately.

[0017] A layered degreasing storage medium, wherein the storage medium stores instructions that, when invoked by a processor, are used to implement any of the aforementioned layered degreasing techniques.

[0018] In summary, the present invention has the following advantages compared with the prior art: This method first acquires three-dimensional data of the body surface and subcutaneous tissue, constructs a three-dimensional model including the subcutaneous fat layer, then divides the fat layer into different depths along the normal direction of the body surface, and finally matches the corresponding focal length laser to each layer depth for treatment. This can accurately adapt to the differences in subcutaneous fat depth among different individuals and in different areas. It eliminates the need for prolonged constant power irradiation, ensuring that fat layers at different depths receive appropriate laser energy. This reduces equipment operating costs and avoids the problems of insufficient energy for deep fat layers and excessive energy for superficial fat layers, contributing to a more satisfactory fat-dissolving effect. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 The flowchart of the layered degreasing technique provided in this application; Figure 2 A flowchart illustrating the steps for correcting and adjusting the laser duty cycle and dwell time provided in this application; Figure 3 A structural diagram of the layered grease-melting system provided in this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0021] According to one embodiment of the present invention, such as Figure 1 As shown, a layered fat reduction technique includes the following steps: Acquire three-dimensional body surface data and subcutaneous tissue data; Based on three-dimensional body surface data and subcutaneous tissue data, a three-dimensional model including body surface morphology and subcutaneous fat layer is constructed. Along the surface normal of the 3D model, the subcutaneous fat region of the fat layer to be melted is divided into several fat layers of different depths. The laser with the corresponding focal length is selected based on the depth of each fat layer to perform the fat reduction operation until the fat reduction is completed.

[0022] In this embodiment, three-dimensional surface data and subcutaneous tissue data of the target area are first acquired using a ToF depth camera and millimeter-wave radar, respectively. The acquired data is filtered to remove interfering data, and then a three-dimensional model containing the surface morphology and subcutaneous fat layer distribution is constructed by combining the two types of data. Subsequently, based on the normal direction of each point on the surface in the three-dimensional model and referring to the fat unit parameters corresponding to the minimum thermal dose of a single laser point, the fat layer to be melted is divided into multiple fat layers of different depths along the normal direction, ensuring complete coverage between layers and minimal thermal overlap. The fat layer to be melted refers to the subcutaneous fat area to be treated. Finally, for each fat layer, the laser focal length is adjusted using a zoom lens group to ensure the laser focus is precisely on the target fat layer. Then, an XY scanner is used to sequentially perform the fat melting operation on each layer until all fat layers have been treated.

[0023] In one possible implementation, the steps for constructing a three-dimensional model that includes the body surface morphology and subcutaneous fat layer include: Three-dimensional body surface data is acquired using a ToF depth camera, and an initial three-dimensional model is constructed based on the three-dimensional body surface data. Data on subcutaneous tissue, including subcutaneous fat, is acquired using millimeter-wave radar. Subcutaneous tissue data is mapped onto an initial 3D model to form a 3D model that includes the body surface morphology and subcutaneous fat layer.

[0024] In this embodiment, a ToF depth camera is activated to acquire three-dimensional surface data of the target area. After data processing, a mesh reconstruction algorithm is used to construct an initial three-dimensional model that can represent the undulating shape of the body surface. Simultaneously, a millimeter-wave radar is used to scan the target area, and subcutaneous tissue data, including the subcutaneous fat boundary, is extracted based on the differences in the reflection characteristics of different tissues. Then, a spatial coordinate correspondence between the ToF initial model and the millimeter-wave radar data is established, and the subcutaneous tissue data is accurately mapped onto the initial three-dimensional model according to the coordinates. A fat layer mesh is superimposed on the surface mesh of the initial model, ultimately forming a complete three-dimensional model that simultaneously includes the body surface morphology and the subcutaneous fat layer.

[0025] In one possible implementation, the step of dividing the fat layer to be melted into several fat layers of different depths includes: Obtain the fat volume unit that reaches the preset minimum thermal dose under single-point laser action conditions, and use the thickness of the fat volume unit as the thickness of the minimum fat unit. The thickness of a single fat layer is calculated based on the thickness of the smallest fat unit. The interlayer spacing between adjacent fat layers is calculated based on the thickness of the smallest fat unit. By inputting the interlayer spacing and single-layer thickness into the 3D model, multiple continuous fat layers along the normal direction of the body surface are obtained.

[0026] In this embodiment, the minimum thermal dose of a single-point laser effect is first obtained through a simulated fat phantom experiment. The minimum fat unit parameters corresponding to this dose are determined by testing to be a transverse equivalent radius r = 1.5 mm and a longitudinal equivalent half-thickness r' = 2 mm. The formula for calculating the single-layer thickness of the fat layer is h ≤ 2r', and based on this formula, the single-layer thickness of the fat layer is set to 4 mm. Simultaneously, the interlayer spacing between adjacent fat layers is calculated using the formula Δz ≈ αr' (α ∈ (0,1]). In this embodiment, for regions with small curvature in the fat layer of the 3D model, α is taken as 0.8, and the calculated interlayer spacing Δz = 1.6 mm is obtained. For regions with large curvature in the model (such as near joints), α is taken as 0.6, and the calculated interlayer spacing Δz = 1.2 mm is obtained. This aims to avoid interlayer energy loss and reduce thermal crosstalk. Subsequently, the calculated single-layer thickness and interlayer spacing are input into the 3D model. The system performs equidistant offsets along the point-by-point normal direction of the model surface, ultimately generating multiple continuous fat layers.

[0027] In one possible implementation, the steps for performing the degreasing operation include: Mesh the 3D model based on the size of the smallest fat unit; The first discrete grid is acquired using a Poisson disk distribution or a blue noise point distribution. The laser duty cycle and dwell time are determined based on the thickness of the smallest fat unit and the unit grid width of the first discrete grid. Liposuction is performed on the fat layer within the first discrete grid based on the laser duty cycle and dwell time.

[0028] In this embodiment, based on the lateral dimensions of the smallest fat unit, the fat layer to be processed in the 3D model is divided into several unit grids, ensuring that each unit grid can cover the core area of ​​a single smallest fat unit. A Poisson disk distribution or blue noise distribution is used to acquire the first discrete grid within the divided grid, avoiding energy overlap between adjacent discrete points. The Poisson disk distribution and blue noise distribution are random sampling methods used to generate a spatially uniform but not overly dense set of sampling points. The duty cycle and dwell time of the laser applied to the first discrete grid are determined based on the thickness of the smallest fat unit and the unit grid width of the first discrete grid. Then, the XY scanner moves according to the coordinate sequence of the first discrete grid, and the laser module outputs laser light according to the set duty cycle and dwell time to perform fat melting on the fat layer within the first discrete grid.

[0029] In one possible implementation, the steps for performing the degreasing operation also include: After the first discrete mesh completes the melting process, the first discrete mesh is offset by half the mesh length along the X-axis and by half the mesh length along the Y-axis to form the second discrete mesh. The laser duty cycle and dwell time are determined based on the thickness of the smallest fat unit and the unit grid width of the second discrete grid. Liposuction is performed on the fat layer within the second discrete grid based on the laser duty cycle and dwell time.

[0030] In this embodiment, after completing the fat melting operation within the first discrete grid, the first discrete grid is offset by half the unit grid length along both the X and Y axes to form a second discrete grid. This second discrete grid covers the gap areas not addressed during the fat melting operation on the first discrete grid. Based on the thickness of the smallest fat unit, the unit grid width of the second discrete grid, and the current depth of the fat layer, a laser duty cycle and dwell time suitable for the second discrete grid are determined. If the current fat layer is deep, the duty cycle is increased or the dwell time is extended; if it is shallow, the duty cycle is decreased or the dwell time is reduced. Subsequently, the XY scanner moves according to the coordinates of the second discrete grid, and the laser module performs the fat melting operation on the second discrete grid according to the corresponding duty cycle and dwell time, ensuring uniform energy distribution throughout the fat layer.

[0031] In one possible implementation, during the degreasing operation, the laser duty cycle and dwell time at the edges of the 3D model are less than those in the central region.

[0032] In this embodiment, the edge and middle regions of the current fat layer are first defined in the 3D model. Typically, a grid area within a certain range from the fat layer boundary (this range is a preset value, usually adjustable based on the user's actual body surface morphology and on-site examination) is designated as the edge region, and the remainder as the middle region. For the edge region, considering that heat easily diffuses outwards and the skin is thinner, the laser duty cycle and dwell time are set to lower values ​​than those in the middle region to avoid excessive energy in the edge region.

[0033] In one possible implementation, during the degreasing operation, the laser dose within the current grid is monitored in real time. If the laser dose is less than or greater than the preset standard dose, the laser duty cycle and dwell time are immediately corrected and adjusted. The preset standard laser dose for the edge area is lower than the preset standard laser dose for the middle area.

[0034] In one possible implementation, such as Figure 2 As shown, the steps for correcting and adjusting the laser duty cycle and dwell time include: Construct a standard dose mapping model; Based on historical experimental samples, establish a mapping relationship between the two-dimensional coordinates of the unit grid, the fat layer depth, the fat layer curvature, the laser incident angle, and the preset standard laser dose, and store the mapping relationship in the standard dose mapping model; Obtain the area, 2D coordinates, fat layer depth, and fat layer curvature of the current cell mesh; Obtain the laser output power, laser duty cycle, dwell time, and laser incident angle acting on the current cell grid; The laser dose of the current cell is calculated based on the laser output power, laser duty cycle, dwell time, and area of ​​the current cell. The current grid's two-dimensional coordinates, fat layer depth, fat layer curvature, and laser incident angle are input into the standard dose mapping model to match and obtain the preset standard laser dose; The laser deviation is calculated by comparing the laser dose with the standard laser dose. The laser duty cycle and dwell time are corrected and adjusted by the laser deviation.

[0035] In this implementation, a large number of historical experimental samples are first collected. These samples cover the standard laser dose corresponding to the two-dimensional coordinates, fat layer depth, fat layer curvature, and laser incident angle of different cell grids. Based on these samples, a mapping relationship is established, a standard dose mapping model is constructed, and stored. During liposuction of the current cell grid, the area, two-dimensional coordinates, fat layer depth and curvature of the grid, as well as the laser output power, duty cycle, dwell time, and incident angle are obtained. The actual laser dose is calculated based on the laser output power, duty cycle, dwell time, and grid area. Then, the two-dimensional coordinates, fat layer depth, curvature, and incident angle of the current grid are input into the standard dose mapping model to match and obtain the standard laser dose. The deviation between the actual dose and the standard dose is calculated. The laser duty cycle and dwell time are adjusted according to the magnitude of the deviation. If the deviation is large, both parameters can be adjusted simultaneously; if the deviation is small, adjusting one parameter is sufficient to ensure that the corrected actual dose meets the standard requirements.

[0036] In one possible implementation, the steps for selecting a laser with a corresponding focal length to perform the degreasing operation include: Obtain the current depth and curvature of the fat layer, and also obtain the current laser incident angle; Input the current fat layer depth, current fat layer curvature and current laser incident angle into the focal length calculation function to calculate the corresponding focal length control parameters; Focusing of the laser is achieved using focal length control parameters.

[0037] In this embodiment, the depth data of the fat layer to be processed and the corresponding curvature data are extracted from the 3D model. The angle sensor of the XY scanner collects the incident angle of the laser when irradiating the current fat layer in real time. The obtained fat layer depth, curvature, and laser incident angle are substituted into the focal length calculation function. This function is established based on the previous phantom calibration and can output the corresponding focal length control parameters according to the input parameters. The obtained focal length control parameters are sent to the drive module of the zoom lens group. The zoom lens group adjusts the lens spacing according to the control parameters to achieve precise adjustment of the laser focal length, so that the laser focus falls on the current fat layer.

[0038] In one possible implementation, the formula for the focal length calculation function is: ; Where z represents the fat layer depth; u represents the focal length control parameter; ρ represents the fat layer curvature; and θ represents the laser incident angle.

[0039] In this embodiment, the focal length calculation function is obtained by fitting the previous phantom calibration data, and can calculate the focal length based on the input fat layer depth (z) and fat layer curvature (z). ) and laser incident angle ( The corresponding focal length control parameter (u) is obtained to compensate for the influence of surface curvature and incident angle changes on the focal position. The greater the fat layer depth (z), the larger the focal length control parameter (u), which can cover full-condition samples with different fat layer depths, curvatures, and laser incident angles, avoiding parameter blind spots in practical applications. Its core function is to dynamically compensate for the influence of multiple factors on the focal position. It can correct the laser propagation path offset caused by the surface curvature according to the fat layer curvature, and compensate for optical path changes in combination with the laser incident angle to ensure that the focal point does not deviate from the target layer.

[0040] In one possible implementation, during the fat melting operation, each fat layer is melted in order from deep to shallow.

[0041] In this embodiment, the process is as follows: First, the depth data of all fat layers in the 3D model are read, and the fat layers are sorted in descending order of depth to determine the fat melting sequence from the deepest to the shallowest layer. The deepest fat layer is processed first. The laser focal length is adjusted using a zoom lens group to focus on the deepest fat layer, and the XY scanner is used to complete the fat melting operation for this layer. After completing the deepest layer, the focal length is adjusted to the depth of the next deepest fat layer, and the fat melting operation for that layer is performed, and so on, until the fat melting of the shallowest fat layer is completed. After each layer is completed, a short pause can be made to allow the heat from that layer to dissipate sufficiently before proceeding to the next layer. This utilizes the upward diffusion of heat from deeper layers to improve the efficiency of shallow layer operations while reducing interlayer thermal crosstalk.

[0042] In one possible implementation, during the fat melting operation, the fat layer is melted in an alternating order, and then a fat layer that is offset from the current fat layer is selected for fat melting.

[0043] In this embodiment, in addition to performing fat melting in the order from deep to shallow as described above, a staggered fat melting method can also be used. The process is as follows: First, the fat layers in the 3D model are numbered and sorted. Then, the order of staggered operations is determined. For example, fat layers numbered 1, 3, and 5 are processed first, followed by fat layers numbered 2, 4, and 6. First, the laser focus is adjusted for fat layer number 1, and fat melting is performed. After completion, fat layer number 2 is skipped, and the focus is directly adjusted to the depth of fat layer number 3 to perform fat melting. This process continues until the odd-numbered fat layers are processed. Then, even-numbered fat layers are processed in the same manner. After each staggered fat layer is processed, a short cooling interval can be set to further suppress thermal crosstalk between adjacent fat layers, ensuring the fat melting effect and safety of each layer.

[0044] Secondly, such as Figure 3 As shown, this application also provides a layered degreasing system for implementing the above-mentioned degreasing technology, comprising: The data acquisition unit is configured to acquire three-dimensional body surface data and subcutaneous tissue data; The model building unit is configured to build a three-dimensional model based on three-dimensional body surface data and subcutaneous tissue data; The depth division unit is configured to divide the fat layer to be melted into several fat layers of different depths along the surface normal direction of the three-dimensional model. The laser irradiation unit is configured to select the corresponding focal length of the laser based on the depth of each fat layer for fat melting.

[0045] In one possible implementation, the system also includes: The laser dose monitoring unit is configured to monitor the laser dose in the current grid in real time during the grease melting operation. If the laser dose is less than or greater than the preset standard dose, the laser duty cycle and dwell time will be corrected and adjusted immediately.

[0046] Thirdly, this application also provides a layered degreasing storage medium, which stores instructions that, when called by a processor, are used to implement any of the aforementioned layered degreasing techniques.

[0047] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A layered fat-dissolving technology, characterized in that, Includes the following steps: Acquire three-dimensional body surface data and subcutaneous tissue data; Based on the aforementioned three-dimensional body surface data and subcutaneous tissue data, a three-dimensional model including body surface morphology and subcutaneous fat layer is constructed. Along the surface normal direction of the three-dimensional model, the subcutaneous fat region of the fat layer to be melted is divided into several fat layers of different depths. The laser with the corresponding focal length is selected based on the depth of each fat layer to perform the fat melting operation until the fat melting is completed.

2. The layered fat-dissolving technology according to claim 1, characterized in that, The steps for constructing a three-dimensional model that includes the body surface morphology and subcutaneous fat layer include: Three-dimensional body surface data is acquired using a ToF depth camera, and an initial three-dimensional model is constructed based on the three-dimensional body surface data. Data on subcutaneous tissue, including subcutaneous fat, is acquired using millimeter-wave radar. The subcutaneous tissue data is mapped onto an initial three-dimensional model to form a three-dimensional model that includes the body surface morphology and the subcutaneous fat layer.

3. The layered fat-dissolving technique according to claim 2, characterized in that, The steps of dividing the fat layer to be melted into several fat layers of different depths include: Obtain the fat volume unit that reaches the preset minimum thermal dose under single-point laser action conditions, and take the thickness of the fat volume unit as the thickness of the minimum fat unit. The thickness of a single fat layer is calculated based on the thickness of the smallest fat unit. The interlayer spacing between adjacent fat layers is calculated based on the thickness of the smallest fat unit. By inputting the interlayer spacing and single-layer thickness into the three-dimensional model, a multi-layered continuous fat layer along the normal direction of the body surface is obtained.

4. The layered fat-dissolving technique according to claim 3, characterized in that, The steps involved in performing fat melting include: The three-dimensional model is meshed based on the size of the smallest fat unit. The first discrete grid is acquired using a Poisson disk distribution or a blue noise point distribution. The laser duty cycle and dwell time are determined based on the thickness of the smallest fat unit and the unit grid width of the first discrete grid. The fat layer within the first discrete grid is melted based on the laser duty cycle and dwell time.

5. The layered fat-dissolving technique according to claim 4, characterized in that, The steps involved in performing fat melting also include: After the first discrete mesh completes the melting process, the first discrete mesh is offset by half the mesh length along the X-axis and by half the mesh length along the Y-axis to form the second discrete mesh. The laser duty cycle and dwell time are determined based on the thickness of the smallest fat unit and the unit grid width of the second discrete grid. The fat layer within the second discrete grid is melted based on the laser duty cycle and dwell time.

6. The layered fat-dissolving technique according to claim 4, characterized in that, During the degreasing operation, the laser duty cycle and dwell time at the edge of the three-dimensional model are less than those in the middle region.

7. A layered fat-dissolving technique according to any one of claims 4, 5, or 6, characterized in that, During the degreasing operation, the laser dose within the current grid is monitored in real time. If the laser dose is less than or greater than the preset standard dose, the laser duty cycle and dwell time are immediately corrected and adjusted.

8. The layered fat-dissolving technique according to claim 7, characterized in that, The steps for correcting and adjusting the laser duty cycle and dwell time include: Construct a standard dose mapping model; Based on historical experimental samples, establish a mapping relationship between the two-dimensional coordinates of the unit grid, the fat layer depth, the fat layer curvature, the laser incident angle, and the preset standard laser dose, and store the mapping relationship in the standard dose mapping model; Obtain the area, 2D coordinates, fat layer depth, and fat layer curvature of the current cell mesh; Obtain the laser output power, laser duty cycle, dwell time, and laser incident angle acting on the current cell grid; The laser dose of the current grid is calculated based on the laser output power, laser duty cycle, dwell time, and area of ​​the current cell grid. The two-dimensional coordinates, fat layer depth, fat layer curvature, and laser incident angle of the current grid are input into the standard dose mapping model to match and obtain the preset standard laser dose; The laser deviation is calculated by comparing the laser dose with the standard laser dose. The laser duty cycle and dwell time are corrected and adjusted by the laser deviation.

9. The layered fat-dissolving technique according to claim 1, characterized in that, The steps for selecting a laser with the appropriate focal length for fat reduction include: Obtain the current depth and curvature of the fat layer, and also obtain the current laser incident angle; Input the current fat layer depth, current fat layer curvature and current laser incident angle into the focal length calculation function to calculate the corresponding focal length control parameters; The laser is focused using the aforementioned focal length control parameters.

10. The layered fat-dissolving technique according to claim 9, characterized in that, The formula for the focal length calculation function is: ； Where z represents the fat layer depth; u represents the focal length control parameter; ρ represents the fat layer curvature; and θ represents the laser incident angle.

11. The layered fat-dissolving technique according to claim 1, characterized in that, When performing fat melting, the fat layers are melted in order from deep to shallow.

12. The layered fat-dissolving technique according to claim 1, characterized in that, When performing fat melting, follow the order of alternating fat layers. After melting the current fat layer, select a fat layer that is offset from the current fat layer for fat melting.

13. A layered fat-dissolving system, comprising: The data acquisition unit is configured to acquire three-dimensional body surface data and subcutaneous tissue data; The model building unit is configured to build a three-dimensional model based on three-dimensional body surface data and subcutaneous tissue data; The depth division unit is configured to divide the fat layer to be melted into several fat layers of different depths along the surface normal direction of the three-dimensional model. The laser irradiation unit is configured to select the corresponding focal length of the laser based on the depth of each fat layer for fat melting.

14. A layered fat-dissolving system according to claim 13, characterized in that, The system also includes: The laser dose monitoring unit is configured to monitor the laser dose in the current grid in real time during the grease melting operation. If the laser dose is less than or greater than the preset standard dose, the laser duty cycle and dwell time will be corrected and adjusted immediately.

15. A layered grease-melting storage medium, characterized in that, The storage medium stores instructions that, when invoked by a processor, are used to implement the layered grease-melting technique as described in any one of claims 1 to 12.

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