Breast mass measurement method and system based on mechanical interaction between breasts and bra

Abstract

The present invention relates to the field of breast mass measurement. Provided are a breast mass measurement method and system based on the mechanical interaction between breasts and a bra. The breast mass measurement method comprises: a subject wearing a measurement bra and performing repeated movements that cause the regular longitudinal displacement of the breasts, and measuring the vibration acceleration a of breast vibrations relative to the chest cavity during the movements; synchronously measuring a shoulder strap pressure P on contact positions between shoulder straps and the shoulders of the subject during the movements; and performing calculation to obtain the breast mass of the subject on the basis of the vibration acceleration a and the shoulder strap pressure P. The breast mass measurement method of the present invention can prevent measurement results from being affected by factors such as the posture of the subject, the sagging of the subject's breasts, and the age difference of the subject. Furthermore, this method also prevents visits to places such as hospitals for breast mass measurement, thereby reducing the measurement cost, and significantly improving the practicability and convenience of breast mass measurement.

Description

Breast mass measurement method and system based on mutual mechanical action of breast and bra TECHNICAL FIELD

[0001] The present application relates to the technical field of breast mass detection, in particular to a breast mass measurement method and system based on mutual mechanical action of breast and bra. BACKGROUND

[0002] The female breast is located in the anterior chest between the sternum and the midaxillary line, covering the superficial muscle of the anterolateral chest wall. Because there is no substantial anatomical structure to support the breast, it can swing from the chest wall. During running, when the runner's foot contacts the ground, the sudden deceleration of the vertical descent of the torso causes the lower part of the breast to "hit" the anterior abdominal / chest wall, which is considered to be the main cause of exercise-induced breast pain during running. At this time, women need to wear sports bras to reduce the vibration of the breast. When women stand upright, the breast gravity causes a bending moment on the thoracic vertebrae. This bending moment causes excessive load on the thoracic muscle and soft tissue structure, which is related to the posture secondary changes of women with large breasts and the damage of the spinal column and upper limb movement. Therefore, the understanding of the breast weight is crucial for the design of sports bras, the design of artificial breasts and the understanding of how the breast affects the load of the torso and the function of the upper torso musculoskeletal structure.

[0003] The existing breast mass measurement method is to first measure the breast volume and then multiply the density to obtain the breast mass. The main method for measuring the breast volume is to use medical imaging technology. This method generally needs to go to a medical institution such as a hospital, and the price is not cheap. Another commonly used method is three-dimensional scanning, but when scanning women with large and sagging breasts, especially when the lower part of the breast is located in the anterior abdominal wall of women, it will block the view of the scanner to the lower part of the breast, thereby leading to underestimation of the breast volume. In addition, the breast soft tissue is not only prone to sagging due to weight, but also prone to deformation due to posture changes, leading to differences in breast volume measurement results. The measurement of breast density is usually based on the percentage composition of fibrous glandular and fibrous fatty tissue in the breast and the density of these tissues. When measuring the density of the breast, the percentage of fibrous glandular tissue in the breast relative to fibrous fatty tissue varies with age, race, body weight, hormonal status, etc., and these percentage values also vary with the method used to measure the tissue composition. These problems will lead to inaccurate density estimation. And the method of measuring the breast mass by measuring the breast volume and density is expensive, and has low practicality and convenience. SUMMARY

[0004] Therefore, the present application solves the problem of high price, low practicality and convenience of breast mass measurement in the prior art, and provides a breast mass measurement method and system based on mutual mechanical action of breast and bra, which significantly improves the practicality and convenience of breast mass detection.

[0005] In a first aspect, to solve the above technical problems, the present application provides a breast mass measurement method based on the mutual mechanical action of a breast and a bra, comprising:

[0006] The subject wears a detection bra and performs a repetitive motion to regularly displace the breast in the longitudinal direction, and the vibration acceleration a of the breast relative to the chest cavity is measured during the motion; wherein the detection bra comprises shoulder straps;

[0007] and the shoulder strap pressure P on the contact part of the shoulder strap and the shoulder of the subject is synchronously measured during the motion;

[0008] The breast mass of the subject is calculated based on the vibration acceleration a and the shoulder strap pressure P.

[0009] In an embodiment of the present application, the breast mass of the subject is calculated based on the following formula,

[0010] wherein m is the breast mass, P is the shoulder strap pressure, A is the equivalent horizontal plane area of the contact part of the shoulder strap and the shoulder of the subject, g is the acceleration of gravity, and a is the vibration acceleration.

[0011] In an embodiment of the present application, the vibration acceleration a of the breast relative to the chest cavity comprises:

[0012] A global coordinate system O-XYZ in space is established;

[0013] and three points SN, LA and RA are determined on the front side of the torso of the subject, and the relative positions among the three points remain fixed and unchanged during the repetitive motion of the subject, and a dynamic local coordinate system o-uvn is established with the three points SN, LA and RA as the reference plane;

[0014] During the repetitive motion, the coordinate changes of a point BD of any unilateral breast in the global coordinate system O-XYZ are obtained;

[0015] The coordinates of the BD point in the global coordinate system O-XYZ are converted into the coordinates in the dynamic local coordinate system o-uvn, the v-coordinate changes of the BD point in the dynamic local coordinate system o-uvn are obtained, which correspond to the longitudinal displacement of the breast relative to the chest cavity, and the second derivative of the longitudinal displacement is obtained to obtain the vibration acceleration a of the breast relative to the chest cavity.

[0016] In one embodiment of the present application, during the repeated movement, the vibration acceleration curve of the BD point is obtained; and during the repeated movement, the shoulder strap pressure fluctuation curve is obtained; the vibration acceleration curve is synchronized with the shoulder strap pressure fluctuation curve; the vibration acceleration corresponding to the maximum shoulder strap pressure value in one gait is taken as the vibration acceleration of the breast relative to the chest vibration.

[0017] In one embodiment of the present application, the BD point is the mass center point of the breast.

[0018] In one embodiment of the present application, the dynamic local coordinate system o-uvn contains the rigid body motion of six degrees of freedom of the torso.

[0019] In one embodiment of the present application, the detection bra is arranged to enable the gravity load of the breast and the additional load generated by the movement to be completely transferred to the shoulder of the subject, and the detection bra further comprises:

[0020] The bra side that does not bear the breast load;

[0021] The cup, which is arranged as a non-padded cup, so that the surface displacement of the cup is consistent with the displacement of the breast covered thereby;

[0022] The shoulder strap, which is arranged as a non-elastic shoulder strap, so that the shoulder strap has no length expansion deformation in the torso movement.

[0023] In one embodiment of the present application, the shoulder strap pressure P is measured based on a garment pressure measurement system.

[0024] In one embodiment of the present application, the range of the garment pressure measurement system is not higher than 24 kPa, the detection accuracy value is not higher than 200 Pa, and the sampling frequency is greater than or equal to 100 Hz.

[0025] In one embodiment of the present application, the range of the garment pressure measurement system is not higher than 24 kPa, the detection accuracy value is not higher than 200 Pa, and the sampling frequency is greater than or equal to 100 Hz.

[0026] The detection bra, which comprises a shoulder strap, and the subject wears the detection bra to make a repeated movement with regular longitudinal displacement of the breast;

[0027] The movement module, which is used to enable the subject to make a repeated movement with regular longitudinal displacement;

[0028] The vibration acceleration measurement module, which is used to measure the vibration acceleration a of the breast relative to the chest vibration during the movement;

[0029] a shoulder belt pressure measuring module for synchronously measuring a shoulder belt pressure P that the shoulder belt and a part of the subject's shoulder in contact with the shoulder belt bear during the movement;

[0030] a breast mass measuring module configured to obtain a breast mass of the subject according to the vibration acceleration a and the shoulder belt pressure P.

[0031] In an embodiment of the present application, the breast mass measuring module comprises obtaining a breast mass of the subject according to the following formula:

[0032] wherein m is the breast mass, P is the shoulder belt pressure, A is an equivalent horizontal plane area of the part of the subject's shoulder in contact with the shoulder belt, g is the acceleration of gravity, and a is the vibration acceleration.

[0033] The above technical solution of the present application has the following beneficial effects compared with the prior art:

[0034] The breast mass measuring system and method based on the mutual mechanical action of the breast and the bra according to the present application can avoid medical detection such as tomography, magnetic resonance, color ultrasound, etc. in hospitals and other places, reduce the detection cost, and at the same time can avoid the influence of factors such as the posture of the subject, the drooping of the breast of the subject, the age difference of the subject, etc. on the detection result, significantly improving the practicality and convenience of breast mass detection. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to make the content of the present application easier to be clearly understood, the present application will be further described in detail below according to specific embodiments of the present application and in conjunction with the drawings, in which:

[0036] Fig. 1 is a schematic diagram of a breast mass measuring system based on the mutual mechanical action of the breast and the bra according to a preferred embodiment of the present application;

[0037] Fig. 2 is a flowchart of a breast mass measuring method based on the mutual mechanical action of the breast and the bra according to a preferred embodiment of the present application;

[0038] Fig. 3 is a schematic diagram of the structure of a bra for detecting according to a preferred embodiment of the present application;

[0039] Fig. 4 is a schematic diagram of the shoulder belt transferring the breast gravity load and the additional load generated by the movement to the shoulder of the subject and equivalent to the concentrated pressure acting on the horizontal plane of the shoulder top in contact with the shoulder belt in a breast mass detection method based on the mutual mechanical action of the breast and the bra according to a preferred embodiment of the present application;

[0040] Fig. 5 is a schematic diagram of a global coordinate system O-XYZ and a dynamic local coordinate system o-uvn established according to a preferred embodiment of the present application;

[0041] Fig. 6 is a graph of the vibration acceleration curve and the shoulder strap pressure fluctuation curve in a gait cycle when the subject makes repetitive movements;

[0042] Fig. 7 is a graph of the average and standard deviation of the breast mass obtained in 5 gaits of 9 subjects. DETAILED DESCRIPTION

[0043] The present application will be further described below in conjunction with the drawings and specific embodiments so that those skilled in the art can better understand and implement the present application, but the embodiments are not limiting to the present application.

[0044] Example 1

[0045] The embodiment of the present application discloses a breast mass measurement system based on the mutual mechanical action of the breast and the bra, referring to Fig. 1, comprising:

[0046] The detection bra is worn by the subject to make repetitive movements with regular longitudinal displacement of the breast; wherein, referring to Fig. 3, the detection bra comprises a shoulder strap, a bra side ratio and a cup; preferably, the bra side ratio of the detection bra selected in the embodiment of the present application is narrow, which can make the dead weight of the breast be transferred to the shoulder of the subject; the cup is set as a non-padded cup to make the surface displacement of the bra cup consistent with the displacement of the breast under the cup, and at the same time to avoid the influence of the padding on the equivalent effect of the gravity load and the additional load of the breast on the shoulder strap pressure, resulting in the detection result of the breast mass being affected, and improving the reliability of the detection result of the breast mass; the shoulder strap is set as a non-elastic shoulder strap, so that there is no change in the length of the shoulder strap in the body movement, and the additional load generated by the breast vibration changes synchronously with the shoulder strap pressure;

[0047] The movement module is used to make the subject make repetitive movements with regular longitudinal displacement. Specifically, in order to make the breast produce sufficient longitudinal displacement, the movement system in the embodiment of the present application is required to set the running speed to be greater than 12 km / h.

[0048] The vibration acceleration measurement module is used to measure the vibration acceleration a of the breast relative to the chest cavity during the movement. The motion capture system is used to quickly and accurately objectively measure the trunk and breast movement displacement of the subject in the movement, and the displacement of the breast relative to the chest cavity vibration is obtained through the coordinate transformation, and the acceleration is obtained by twice differentiating the longitudinal displacement. Specifically, in order to capture the maximum vibration acceleration of the breast relative to the trunk in the movement, the sampling frequency in the embodiment of the present application is required to be greater than or equal to 100 Hz; for example, in an embodiment, the sampling frequency of the motion capture system can be as high as 200 Hz.

[0049] A shoulder belt pressure measuring module is used to synchronously measure a shoulder belt pressure P that the shoulder belt and a contact part of the shoulder of the subject bear during the movement, the garment pressure measuring system can quickly and accurately objectively measure the garment pressure, and the setting of the detection index thereof can also improve the detection precision of the garment pressure measuring system, so as to meet the requirements of the shoulder belt pressure value measurement. Specifically, since the shoulder belt pressure of the subject after wearing the detection bra generally does not exceed 10 kPa, the range of the garment pressure measuring system is required to be not higher than 24 kPa, the detection precision value is not higher than 200 Pa, and the sampling frequency is greater than or equal to 100 Hz in the embodiment of the present application; for example, in one embodiment, the range of the garment pressure measuring system is 24 kPa, and the detection precision is 200 Pa; so as to ensure that the garment pressure measuring system has high measurement precision; the sampling frequency is 100 Hz, and the sampling frequency of 100 Hz can ensure that the dynamic pressure change is captured in time during the movement, and the breast mass is accurately calculated.

[0050] A breast mass measuring module is configured to calculate the breast mass of the subject according to the vibration acceleration a and the shoulder belt pressure P.

[0051] Specifically, the breast mass measuring module includes calculating the breast mass of the subject based on the following formula:

[0052] Wherein, m is the breast mass, P is the shoulder belt pressure, A is the equivalent horizontal plane area of the contact part of the shoulder belt and the shoulder of the subject, g is the acceleration of gravity, and a is the vibration acceleration.

[0053] Embodiment two

[0054] The embodiment of the present application discloses a breast mass measuring method based on the mutual mechanical action of a breast and a bra, and specifically, with reference to FIG. 2, the method comprises the following steps:

[0055] First, the subject wears a detection bra and does a repeated movement that makes the breast have regular longitudinal displacement, and the repeated movement is preferably uniform speed running;

[0056] The vibration acceleration a of the breast of the subject relative to the chest cavity is measured during the movement, wherein the vibration acceleration a multiplied by the breast mass m of the subject is an additional load generated by the vibration of the breast of the subject relative to the chest cavity;

[0057] Referring to FIG. 4, the shoulder strap transfers the gravity load of the breast of the subject and the additional load generated by the vibration of the chest cavity of the subject to the shoulder of the subject, which is equivalent to the concentrated pressure F on the horizontal plane of the shoulder contacting the shoulder strap, the concentrated pressure F generates the shoulder strap pressure P on the equivalent horizontal plane; and the shoulder strap pressure P is measured synchronously during the movement of the subject; the shoulder strap pressure P is the sum of the gravity load and the additional load divided by the area of the equivalent horizontal plane, the gravity load is the gravity acceleration of the breast multiplied by the mass of the breast, and the additional load is the vibration acceleration multiplied by the mass of the breast;

[0058] And the mass of the breast of the subject is calculated by the shoulder strap pressure value and the vibration acceleration.

[0059] The mass of the breast of the subject is measured by the above method, which can avoid the influence of the posture of the subject, the sagging of the breast of the subject, the age difference of the subject and other factors on the detection result, and at the same time, this method also avoids going to the hospital and other places for breast mass detection, reduces the detection cost, and significantly improves the practicability and convenience of breast mass detection.

[0060] Further, referring to FIG. 4, wherein A is the equivalent horizontal plane area of the contact part of the shoulder strap and the shoulder of the subject, and F is the concentrated pressure;

[0061] The concentrated pressure F is calculated by the formula: F = mg + ma

[0062] Wherein, mg is the gravity load of the breast of the subject, and ma is the additional load generated by the vibration of the chest cavity of the subject.

[0063] Specifically, the mass of the breast of the subject is calculated by the following formula,

[0064] Wherein, m is the mass of the breast, P is the shoulder strap pressure, A is the equivalent horizontal plane area of the contact part of the shoulder strap and the shoulder of the subject, g is the gravity acceleration, and a is the vibration acceleration.

[0065] Specifically, the vibration acceleration a of the breast of the subject relative to the chest cavity is measured, which comprises

[0066] A global coordinate system O-XYZ in space is established; the global coordinate system O-XYZ is parallel to the XY axis plane of the ground and perpendicular to the Z axis direction of the ground;

[0067] Referring to FIG. 5, three points SN, LA and RA are determined on the front side of the subject's torso, wherein the SN point is the suprasternal notch point, the LA and RA points are respectively the left and right front lower points of the tenth rib, and LA and RA are horizontal symmetry points; a reference plane is established by the triangle formed by the lines connecting SN, LA and RA, and a dynamic local coordinate system o-uvn is established through the reference plane; the above selection of SN, LA and RA points can ensure that the relative positions among the three points SN, LA and RA remain fixed and unchanged during the repeated movement of the subject.

[0068] A dynamic local coordinate system o-uvn is established, wherein the dynamic local coordinate system o-uvn takes the SN point as the coordinate origin o, the line connecting the LA point and the RA point as the u-axis direction, the normal direction of the reference plane as the v-axis direction, and the normal direction of the plane formed by the u-axis and the v-axis as the n-axis direction; and the dynamic local coordinate system o-uvn includes the rigid body motion of six degrees of freedom of the torso, including three translational degrees of freedom and three rotational degrees of freedom.

[0069] A BD point is determined on the arbitrary unilateral breast of the subject, wherein the BD point is preferably the centroid position of the unilateral breast, for example, a position point 2 cm below the breast; at this time, the movement of the BD point represents the centroid movement of the unilateral breast of the subject; by selecting the centroid position of the unilateral breast, the maximum amplitude motion trajectory of the breast during the movement of the subject can be accurately captured, and the accuracy of breast quality detection is improved.

[0070] The coordinate change of the BD point in the global coordinate system O-XYZ with the repeated movement is captured by using a motion capture system;

[0071] Since the coordinate change of the BD point in the global coordinate system O-XYZ includes the rigid displacement of the chest cavity, the vibration displacement of the breast relative to the chest cavity cannot be directly reflected in the global coordinate system. In the preferred embodiment of the present application, the coordinate of the BD point in the global coordinate system O-XYZ is transformed into the coordinate in the dynamic local coordinate system o-uvn, so as to accurately and directly reflect the relative position change between the breast and the chest cavity during the movement of the subject, so as to obtain the vibration displacement of the BD point relative to the chest cavity.

[0072] The v-coordinate change of the BD point in the dynamic local coordinate system o-uvn corresponds to the longitudinal displacement of the breast relative to the chest cavity, and the vibration acceleration a of the vibration of the breast relative to the chest cavity is obtained by twice differentiating the longitudinal displacement.

[0073] Further, in order to improve the measurement accuracy and precision, the vibration acceleration a and the shoulder strap pressure P are continuously measured during the repeated movement, as shown in FIG. 6, the vibration acceleration of the BD point is continuously measured and the vibration acceleration curve is drawn, the shoulder strap pressure is continuously measured and the shoulder strap pressure fluctuation curve is drawn, and the vibration acceleration curve and the shoulder strap pressure fluctuation curve are synchronized in time sequence; the vibration acceleration corresponding to the maximum shoulder strap pressure value in one gait is taken as the vibration acceleration of the breast relative to the chest vibration. Specifically, as shown in FIG. 6, in one gait, the left foot moves forward, and before the torso rises to the highest point, the downward acceleration of the left breast relative to the chest vibration reaches the maximum, resulting in the maximum left shoulder strap pressure. At this time, most of the soft tissue of the left breast from the surface layer to the deep layer participates in the vibration relative to the chest, and the peak vibration acceleration a and the corresponding peak shoulder strap pressure P at this point are taken to calculate the maximum breast mass m, which is also the breast soft tissue mass actually participating in the vibration. For breast kinematics research and sports bra design, the breast mass is more accurate, which further improves the measurement accuracy of the breast mass.

[0074] In summary, the breast mass measurement method based on the mutual mechanical action of the breast and the bra according to the present application only requires the subject to wear a detection bra, make a repeated movement that can make the breast have regular longitudinal displacement, and simultaneously measure the shoulder strap pressure P of the subject and the vibration acceleration a of the breast relative to the chest during the repeated movement, and the breast mass of the subject can be calculated through the vibration acceleration a and the shoulder strap pressure value P. This method can avoid the influence of factors such as the posture of the subject, the sagging of the breast of the subject, the age difference of the subject, etc. on the detection result, and at the same time, this method also avoids going to hospitals and other places for breast mass detection, reduces the detection cost, and significantly improves the practicality and convenience of breast mass detection.

[0075] Test Example 1

[0076] FIG. 3 is a detection bra with narrow underbust and narrow side ratio, no padding in the cup, no elasticity in the shoulder strap, and a shoulder strap width of 2 cm; FIG. 6 is the corresponding curve of the shoulder strap pressure value and the breast vibration acceleration of one gait cycle of one subject; and FIG. 7 shows the average value and standard deviation of the breast mass obtained from five stable gaits of nine subjects.

[0077] The detection step is: selecting 9 young women as subjects, the lower chest circumference is between 70-80cm, three of the subjects have cup A, three of the subjects have cup B, and three of the subjects have cup C. Each subject wears the detection bra shown in Figure 5 and runs on a treadmill at a speed of 7km / h for 3 minutes, and the left shoulder strap pressure of each subject is measured by using the Pliance pressure measurement system. As shown in Figure 2, the motion trajectories of three points on the torso: the suprasternal notch point and the left and right tenth rib front lower points and the left inframammary point are obtained synchronously by the Vicon motion capture system, and the vibration acceleration of each subject's breast is obtained by obtaining the vibration longitudinal displacement of the inframammary point relative to the chest cavity, and 5 stable gaits are selected, and the shoulder strap pressure value and the vibration acceleration are used to calculate the average value of the breast mass measured in each five stable gaits of each subject.

[0078] Specifically, as shown in Figure 6, when the shoulder strap pressure reaches the maximum value, the downward vibration acceleration of the breast also reaches the maximum value; the shoulder strap pressure value 7.6kPa and the vibration acceleration 3.14m / s 2 at this time are taken, the equivalent horizontal plane area of the contact part of the shoulder strap with the subject's shoulder is 4cm 2 (2cm*2cm), and the breast mass is calculated to be 235.0g.

[0079] Referring to Figure 7, according to the data predicted in the existing literature, the mass corresponding to the 32A-32F (32 corresponds to the lower chest circumference of 70cm) breast ranges from 110-700g, and the mass obtained by the present method completely falls within the range predicted in the literature, verifying the reliability of the breast mass detection method described in the present application.

[0080] The breast mass measurement method and system based on the mutual mechanical action of the breast and the bra described in the present application adopts the method of making the subject wear a detection bra and do a repeated movement that can make the breast have regular longitudinal displacement, and simultaneously measures the shoulder strap pressure of the subject and the vibration acceleration of the breast relative to the chest cavity during the movement, and calculates the breast mass of the subject through the vibration acceleration and the shoulder pressure value; this method can avoid the influence of factors such as the posture of the subject, the sagging of the breast of the subject, the age difference of the subject, etc. on the detection result, and at the same time, this method also avoids going to hospitals and other places for breast mass detection, reduces the detection cost, and significantly improves the practicality and convenience of breast mass detection.

[0081] Those skilled in the art will appreciate that embodiments of the present application can be readily used as a method, a system or a computer program product. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer readable program code.

[0082] The present application is described in reference to the flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processing system or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams block or blocks.

[0083] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart illustrations and / or block diagrams block or blocks.

[0084] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart illustrations and / or block diagrams block or blocks.

[0085] Obviously, the embodiments described above are only examples for clarity and are not intended to limit the implementation. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to exhaust all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A breast mass measurement method based on breast and bra mutual mechanics, characterized by, The method comprises the following steps: The subject wears a detection bra and makes a repeated movement to make the breast have regular longitudinal displacement, and the vibration acceleration a of the breast relative to the chest cavity is measured during the movement; wherein the detection bra comprises shoulder straps; And the shoulder strap pressure P of the shoulder strap and the contact part of the subject's shoulder is synchronously measured during the movement; The breast mass of the subject is calculated according to the vibration acceleration a and the shoulder strap pressure P.

2. The breast mass measurement method based on breast and bra interaction mechanics according to claim 1, characterized in that, calculating the breast mass of the subject comprises calculating the breast mass of the subject according to the formula, Wherein, m is the breast mass, P is the shoulder strap pressure, A is the equivalent horizontal plane area of the contact part of the shoulder strap and the subject's shoulder, g is the acceleration of gravity, and a is the vibration acceleration.

3. The breast mass measurement method based on breast and bra interaction mechanics according to claim 1 or 2, characterized in that, The measurement of the vibration acceleration a of the breast relative to the chest cavity comprises, A global coordinate system O-XYZ in space is established; And three points SN, LA and RA are determined on the front side of the subject's torso, and the relative positions among the three points remain fixed and unchanged during the repeated movement of the subject; a dynamic local coordinate system o-uvn is established with the three points SN, LA and RA as the reference plane; During the repeated movement, the coordinate change of a point BD of any unilateral breast in the global coordinate system O-XYZ is obtained; The coordinates of the BD point in the global coordinate system O-XYZ are converted into the coordinates in the dynamic local coordinate system o-uvn, and the v coordinate change of the BD point in the dynamic local coordinate system o-uvn is obtained as the longitudinal displacement of the breast relative to the chest cavity, and the second derivative of the longitudinal displacement is obtained as the vibration acceleration a of the breast relative to the chest cavity.

4. The breast mass measurement method based on breast and bra interaction mechanics according to claim 3, characterized in that, Further comprising, During the repeated movement, the vibration acceleration curve of the BD point is obtained; And during the repeated movement, the shoulder strap pressure fluctuation curve is obtained; The vibration acceleration curve and the shoulder strap pressure fluctuation curve are synchronized, and the vibration acceleration corresponding to the maximum shoulder strap pressure value in one gait is taken as the vibration acceleration of the breast relative to the chest cavity.

5. The breast mass measurement method based on breast and bra interaction mechanics according to claim 3, characterized in that, The BD point is the centroid point of the breast.

6. The breast mass measurement method based on breast and bra interaction mechanics according to claim 3, characterized in that, The dynamic local coordinate system o-uvn includes the rigid body motion of six degrees of freedom of the torso.

7. The breast mass measurement method based on breast and bra interaction mechanics according to claim 1, characterized in that, The detection bra is arranged to enable the gravity load of the breast and the additional load generated by the movement to be completely transferred to the subject's shoulder; The detection bra further comprises: Bra side ratio, which does not bear the breast load; Cup, which is arranged as a non-padded cup to make the surface displacement of the cup consistent with the displacement of the breast under the cup; The shoulder strap, which is arranged as a non-elastic shoulder strap to make the shoulder strap have no length expansion and deformation in the torso movement.

8. The breast mass measurement method based on breast and bra interaction mechanics according to claim 1, characterized in that, The shoulder strap pressure P is measured based on a garment pressure measurement system; the range of the garment pressure measurement system is not higher than 24 kPa, the detection accuracy value is not higher than 200 Pa, and the sampling frequency is greater than or equal to 100 Hz.

9. A breast mass measurement system based on breast and bra mutual mechanics, characterized by, It comprises: A detection bra comprising shoulder straps, which is worn by the subject to make a repeated movement to make the breast have regular longitudinal displacement; A vibration acceleration measurement module for measuring the vibration acceleration a of the breast relative to the chest cavity during the movement; a shoulder belt pressure measuring module for synchronously measuring a shoulder belt pressure P that the shoulder belt and a contact part of the subject's shoulder are subjected to during the movement; a breast mass measuring module configured to calculate a breast mass of the subject according to the vibration acceleration a and the shoulder belt pressure P.

10. The breast mass measurement system based on breast and bra interaction mechanics according to claim 9, wherein, The breast mass measurement module includes calculating the subject's breast mass based on the following formula: wherein m is the breast mass, P is the shoulder belt pressure, A is an equivalent horizontal plane area of the contact part of the shoulder belt and the subject's shoulder, g is the acceleration of gravity, and a is the vibration acceleration.

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