Method and device for detecting bone density

Abstract

The present invention discloses a method and device for detecting bone density, including a transmitter for transmitting ultrasonic waves through soft tissue at the transmitter to bones; a receiver, provided with a groove between the transmitter and the receiver to prevent ultrasonic interference, for receiving ultrasonic waves from the bones to the soft tissue at the receiver; a controller connected to the transmitter and the receiver, for calculating the time from when the transmitter sends the ultrasonic wave to when the receiver receives the ultrasonic wave, and judging the bone density by the length of time. The present invention leaves a structural gap between the transmitter and the receiver of the probe, which can delay the appearance time of the interference waveform, so that the ultrasonic bone density probe performs more smoothly and has higher accuracy than the existing probe when testing various populations.

Description

Technical Field

[0001] The present invention relates to the field of bone density detection, and in particular to a method and device for detecting bone density. Background Art

[0002] The detection of bone density in infants and young children is of great significance. By detecting the bone density of children, we can prevent bone deformation or other symptoms and take countermeasures in advance.

[0003] For patients with type 2 diabetes, osteoporosis is a complication of this type of diabetes; it is particularly important to detect the bone density of diabetic patients in a timely manner, so that prevention and treatment can be carried out in advance, effectively preventing the occurrence of diabetic foot.

[0004] Bone strength is an important indicator for evaluating human health. Bone mineral density is usually used clinically to characterize the health of bones. Studies have shown that the propagation speed of ultrasound in bones is positively correlated with bone mineral density. By detecting the propagation speed of ultrasound on the bone surface, the bone mineral density can be reflected. Ultrasonic bone density detection technology has been applied.

[0005] Bone density probes usually include multiple ultrasonic transmitters and multiple ultrasonic receivers. When the probe works on the skin surface, the ultrasonic waves will form multiple different propagation paths between each transmitter and receiver. By analyzing the bone ultrasonic signal, the propagation speed of the ultrasonic wave on the bone surface can be calculated, thereby reflecting the bone mineral density of the subject.

[0006] The ultrasonic wave output by any transmitter will eventually be received by any receiver. In this process, the ultrasonic wave will propagate from all media between the array elements until it is received by the receiver - for example, it will propagate from the probe shell, from the inside of the probe, from the coupling agent, from the coupling agent to the soft tissue and then to the coupling agent, and from the coupling agent to the soft tissue, bone, soft tissue, coupling agent - the last path mentioned above is the path from which we can extract bone density information, and other paths can be regarded as interference paths. The existence of interference paths may affect both the measurement process and the results.

[0007] The bone densitometer analyzes the ultrasound waves received by the receiver along all propagation paths, extracts the information of the ultrasound waves coupled together along all the above paths, identifies and analyzes the effective path information propagating from the bones, and calculates the final bone density.

[0008] Under normal circumstances, for healthy adults with normal BMI, the first signal received by the receiver of each bone density probe is the signal transmitted through the bone, because the speed of sound is the highest on the bone surface; but when the subject has thicker body fat or low bone density, the time it takes for the receiver to receive the bone signal will be delayed. When the delay reaches a certain level, the ultrasonic waves of the interference signal and the bone signal will couple together, which will cause the test process to become stuck and the test results to be abnormal. The closer the transmitter and receiver are, the more likely they will be affected by inherent interference in advance.

[0009] Therefore, avoiding interference paths in ultrasonic transmission is of great significance to improving the adaptability, test accuracy and fluency of ultrasonic bone densitometers for different populations. Summary of the invention

[0010] The purpose of the present invention is to provide a method and device for detecting bone density, aiming to solve the problem of bone density detection.

[0011] The present invention provides a device for detecting bone density, comprising:

[0012] A transmitter for transmitting ultrasound waves through soft tissue at the transmitter to bones;

[0013] A receiver, provided with a groove between the receiver and the transmitter to prevent ultrasonic interference, and used for receiving ultrasonic waves from the bone to the soft tissue at the receiver;

[0014] The controller is connected to the transmitter and the receiver, and is used to calculate the time from when the transmitter sends out the ultrasonic wave to when the receiver receives the ultrasonic wave, and judge the bone density by the length of time.

[0015] The present invention also provides a method for detecting bone density, comprising:

[0016] S1. A transmitter transmits ultrasonic waves through soft tissue at the transmitter to bones, and a receiver provided with a groove between the transmitter and the receiver to prevent ultrasonic interference receives the ultrasonic waves from the bones to the soft tissue at the receiver;

[0017] S2. The controller calculates the time from when the transmitter sends out the ultrasonic wave to when the receiver receives the ultrasonic wave, and determines the bone density based on the length of time.

[0018] By adopting the embodiment of the present invention, a structural gap is left between the transmitter and the receiver of the probe. During testing, coupling agent is required to be applied to one side of the transmitter and one side of the receiver for measurement, thereby reducing the propagation path and delaying the appearance time of the interference waveform. As a result, the ultrasonic bone density probe can perform more smoothly and with higher accuracy when testing various groups of people than the existing probe.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 is a schematic diagram of a device for detecting bone density according to an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of a transmission path of a device for detecting bone density according to an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of the fastest transmission path of the device for detecting bone density according to an embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the BC path receiving waveform of the planar bone density probe in the prior art;

[0025] Figure 5 1 is a schematic diagram of a BC path receiving waveform of a device for detecting bone density according to an embodiment of the present invention;

[0026] Figure 6 is a flow chart of a method for detecting bone density according to an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1: Transmitter; 2: Receiver; 3: Controller; 4: Groove. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Device Embodiment

[0033] According to an embodiment of the present invention, a device for detecting bone density is provided. Figure 1 Schematic diagram of a device for detecting bone density according to an embodiment of the present invention. Figure 1 As shown, specifically including:

[0034] Transmitter 1, used to transmit ultrasonic waves through soft tissue at transmitter 1 to bones;

[0035] The transmitter 1 is specifically used to transmit ultrasonic waves through the coupling agent, and then through the soft tissue at the transmitter 1 to the bone, wherein the coupling agent is used to remove the air from the contact surface between the transmitter 1 and the soft tissue.

[0036] The receiver 2 is provided with a groove between the receiver and the transmitter 1 to prevent ultrasonic interference, and is used to receive ultrasonic waves from the bone to the soft tissue at the receiver 2;

[0037] The receiver 2 is specifically used to receive ultrasound waves from the bone to the soft tissue at the receiver 2 and then to the coupling agent, wherein the coupling agent is used to exclude air from the contact surface between the receiver 2 and the soft tissue.

[0038] The controller 3 is connected to the transmitter 1 and the receiver 2, and is used to calculate the time from when the transmitter 1 sends out the ultrasonic wave to when the receiver 2 receives the ultrasonic wave, and judge the bone density according to the length of time.

[0039] Sound insulation material is added to the inner side of the outer shell of the groove 4 to prevent ultrasonic interference, and the groove 4 is a U-shaped groove.

[0040] The existing ultrasonic bone density system is prone to test process jams and abnormal test results due to probe problems when testing people with thick body surface fat (obese people, acromegaly patients, etc.) or low bone density values ​​(such as infants, osteoporosis patients, diabetic patients, etc.), affecting the clinical doctor's diagnosis of the patient's bone density.

[0041] The present invention provides a technology that is more conducive to testing the bone density of the above-mentioned population. The innovative features of this technology are:

[0042] The transmitting array element and the receiving array element of the probe are separated from each other in terms of structure, thus blocking the invalid transmission path of ultrasound in the internal structure of the probe and avoiding the interference of the invalid transmission path of ultrasound on the echo signal of human bone density, making the whole bone density detection process more accurate and smooth.

[0043] The advantage of doing this is that it avoids the situation where the delayed bone density echo signal is affected by interference signals when the subject has thick body fat and low bone density. This solves the problems of an unsmooth test process and inaccurate test results, and also improves the universality of the ultrasonic bone density system for different test populations.

[0044] The bone density probes currently on the market use various sound-insulating materials inside the probe to block the transmission of ultrasonic waves. When testing bone density, ultrasonic waves will inevitably be transmitted from the inside of the probe and the outer shell surface of the probe end face; when testing, coupling agent is required to cover the probe end face, and ultrasonic waves will also be transmitted from the coupling agent - all of the above paths can be called interference paths.

[0045] When the subject has thick body fat or low bone density, the time for the ultrasound wave carrying the bone density signal to reach the receiving end will be delayed. The later this time is, the more likely it is to be affected by the ultrasound wave in the interference path, thus affecting the smoothness of the entire test process and the accuracy of the results.

[0046] The technical implementation of this invention mainly lies in delaying the appearance time of the interference waveform;

[0047] This will improve the fluency of the ultrasonic bone density system's measurement process, the accuracy of the test results, and thus improve the universality of the ultrasonic bone density system.

[0048] The clinical performance of bone density probes currently on the market during actual testing:

[0049] When testing people with thick body fat (such as obese people, people with acromegaly, etc.) or low bone density (such as infants, young children, patients with diabetic foot, etc.), the test process is prone to jamming and unsmoothness due to problems with the probe counting. It is necessary to change the angle and press hard to measure the value, and the measured value is also likely to deviate greatly from the empirical value.

[0050] Here are the reasons:

[0051] For the above-mentioned groups of people, a common problem is that the ultrasound wave carrying the bone density signal of people with thick body surface fat or low bone density will arrive at the probe receiver later than the ultrasound wave carrying the bone density signal of normal adults;

[0052] The interference signal can be regarded as the inherent signal of the probe. The later the signal ultrasound reaches the receiver, the more likely it is to increase the possibility of interference waveform coupling and superposition, and the more likely it is to cause the system to identify the waveform incorrectly, thus affecting the smoothness and accuracy of the ultrasonic bone density test.

[0053] One of the key points of the present invention is to leave a structural gap between the transmitter and the receiver of the probe. During the test, the coupling agent is required to be applied to the transmitter side and the receiver side for measurement. Compared with the bone density probes on the market, at least three propagation paths of ultrasound waves can be eliminated - the path transmitted from the coupling agent on the probe end face, the path transmitted from the gap of the sound insulation material in the probe internal structure, and the path transmitted from the bone density probe end face structure.

[0054] The reduction of these paths can delay the appearance of interfering waveforms, thereby making the ultrasonic bone density probe perform more smoothly and produce more accurate results than existing probes when testing various populations.

[0055] The technical implementation of the present invention is as follows: the position between the transmitter and the receiver at the front end of the bone density probe is hollowed out to leave a gap;

[0056] The probe with the hollowed-out middle described in the first point is called a U-shaped probe. The U-shaped probe can effectively suppress the sound transmission path of ultrasonic waves from the probe end face coupling agent, the probe end face shell structure surface, and the sound insulation material gap inside the probe, delaying the inherent interference waveform of the probe. The transmission path is shown in the figure below.

[0057] Figure 2 Schematic diagram of the transmission path of the device for detecting bone density according to an embodiment of the present invention. Figure 2As shown, the ultrasonic wave is emitted by the transmitter on one side of the U-shaped probe, and sound insulation material is added inside the outer shell of the U-shaped probe groove to prevent the ultrasonic wave from propagating through the outer shell. At the same time, it is necessary to ensure that there is no coupling agent in the middle of the U-shaped groove during the test; at this time, there are two transmission paths for the ultrasonic wave, namely path a (transmitter-coupling agent-soft tissue-coupling agent-receiver) and path b (transmitter-coupling agent-soft tissue-bone-soft tissue-coupling agent-receiver) as shown in the figure below (the figure below shows 4 array elements, in fact, bone density measurement can be achieved with more than or equal to 3 array elements, and the following takes 4 array elements as an example).

[0058] In actual application, the four array elements of the probe are named ABCD, where AB is the transmitting array element and CD is the receiving array element. After the ultrasound is emitted from the transmitter B, the distance between the transmitter and the skin surface is ignored, and the soft tissue depth h and the BC spacing L are recorded. BC , the speed of sound in soft tissue Vs(Soft tissue), the speed of sound on the bone surface V B (Bone), the angle α between the transmitter, the receiver and the probe end face.

[0059] For people with low bone density, the time it takes to transmit on the bones through path b will be longer than that of normal people (due to low bone density, ultrasound propagates slowly on the bones); for people with thicker soft tissue, the time it takes to conduct in the soft tissue through path b will be longer - and the interfering ultrasound is an inherent interference. The later the signal waveform reaches the receiver, the more likely it is to be affected by the interference waveform a, which is superimposed on the signal waveform, causing the system to identify waveform errors or deviations, thereby affecting the smoothness of the test process and the accuracy of the test results.

[0060] Figure 3 Schematic diagram of the fastest transmission path of the device for detecting bone density according to an embodiment of the present invention. Figure 3 As shown,

[0061] Record the soft tissue depth h and BC distance L BC , the speed of sound in soft tissue Vs(Soft tissue), the speed of sound on the bone surface V B (Bone), the angle α between the transmitter, the receiver and the probe end face.

[0062] Analyze the time T of the ultrasonic path b above:

[0063] The transmission path length L of ultrasound in soft tissue S for:

[0064]

[0065] The transmission path length of ultrasound on the bone surface is L B for:

[0066] L S =L BC -3*h*casα (2)

[0067] Ultrasound transmission time in soft tissue T S for:

[0068] T S =L S / V S (3)

[0069] The transmission time of ultrasound on the bone is T B for:

[0070] T S =L S / V S (4)

[0071] The total transmission time T after one round is:

[0072] T=T S / T S (5)

[0073] Combining equations (1) to (5), we can obtain:

[0074]

[0075] It can be found that when h is larger, V B The smaller it is, the later the waveform is received by the receiver.

[0076] When the ultrasound propagates from the nearest soft tissue, the α angle and the thickness of the coupling agent are ignored (the thickness of the coupling agent is extremely thin in actual testing, and calculating the α angle is not very meaningful). At this time, the fastest propagation time of the ultrasound in the soft tissue is T S for:

[0077] T s =L Sc / V S (7)

[0078] When T s =T, the interference waveform will be superimposed on the signal waveform, which will interfere with the normal test.

[0079] The method of establishing experiments to demonstrate that this patent is superior to the ultrasonic bone densitometer on the market is as follows:

[0080] The experiment used two types of bone density probes, a flat one and a U-shaped one. When the transmitting voltage and the probe materials were the same, the same 10mm thick attenuation sheet was tested and the BC waveform was analyzed and studied (the sound velocity of the attenuation sheet at around 23°C was around 1520m / s, and the acoustic impedance was similar to that of human tissue).

[0081] The experiment simulates the interference waveform when the skin and soft tissue of the bone density test subject are extremely thick. The larger the interference waveform and the earlier the interference occurs, the greater the degree of interference to the probe, and the more likely it is that the test data will be abnormal or unable to measure data during the test. By comparing the difference in interference between the U-shaped probe and the flat probe, the experiment proves the advantages of the U-shaped probe and the improved algorithm in testing obese people, infants and osteoporosis patients.

[0082] Software sampling rate f S Set it to 40MHz, use MATLAB to analyze the data received by receiver C, and draw the data waveform of the first 1100 points in one cycle.

[0083] BC is the nearest transmitting and receiving array element. Since the BC waveform will receive the interference waveform first, the interference analysis will be conducted on the BC waveform first.

[0084] Figure 4 Schematic diagram of the BC receiving waveform of the planar bone density probe in the prior art, such as Figure 4 As shown,

[0085] The waveform of the BC path when the flat probe tests the 10mm attenuation sheet, interference appears at point 594, D1=594.

[0086] Figure 5 BC path receiving waveform diagram of the device for detecting bone density according to an embodiment of the present invention is shown in FIG. Figure 5 As shown,

[0087] Interference of the same magnitude appears at point 797, D2=797.

[0088] Assume that the BC signal starts at point 594 when the flat probe is measuring a person, and the BC signal starts at point 797 when the U-shaped probe is measuring a person. Ignoring the transmission time sampling points of the two, the time T when the flat probe receives the interference waveform F (Flat probe):

[0089] T F =D s / f s (S94 / 40000000)s=14.85μs (8)

[0090] The time T when the U-type probe receives the interference waveform U (U-probe):

[0091] T F =D s / f s (797 / 40000000)s=19.92μs (9)

[0092] By processing formula (6), we can get:

[0093]

[0094] Assuming the angle α is 30°, the surface velocity of sound on the bones of an adult is 4000 m / s, the velocity of sound on soft tissue is 1540 m / s, and the BC array element spacing is L BC is 20mm, then for the plane probe:

[0095]

[0096] For U-type probes:

[0097]

[0098] According to the above calculation results and the relevant information assumed, the U-shaped probe can theoretically measure a greater value of skin thickness than the flat probe. D for:

[0099] h D =h u -h p =12.29-8.11=4.18mm (13)

[0100] In summary, compared with the existing bone density probes on the market, the solution of this patent can increase the theoretical detection depth of bone density by 4.18mm.

[0101] The U-shaped structure of the bone density probe is only used to hollow out the part between the transmitter and the receiver. Any shape of groove between the transmitter and the receiver to prevent ultrasonic interference belongs to the U-shaped structure.

[0102] The U-shaped structure of the bone density probe is suitable for probes of all different sizes;

[0103] The U-shaped structure of the bone density probe is applicable to any ultrasonic bone density probe with 3 or more array elements.

[0104] Compared with the planar bone density probe currently on the market, the present invention can ensure better test continuity when clinically testing people with thick surface soft tissue (such as obese people, patients with acromegaly, etc.);

[0105] Compared with the planar bone density probe currently on the market, the present invention can ensure better accuracy when clinically testing people with thick surface soft tissue (such as obese people, patients with acromegaly, etc.);

[0106] Compared with the planar bone density probe currently on the market, the present invention can ensure better test continuity when clinically testing people with low bone mineral density (such as infants, osteoporosis patients, diabetic patients, etc.);

[0107] Compared with the planar bone density probe currently on the market, the present invention can ensure better accuracy when clinically testing people with low bone mineral density (such as infants, osteoporosis patients, diabetic patients, etc.).

[0108] Method Embodiment

[0109] According to an embodiment of the present invention, a method for detecting bone density is provided. Figure 6 is a flow chart of a method for detecting bone density according to an embodiment of the present invention. Figure 6 As shown, specifically including:

[0110] S1, a transmitter transmits ultrasonic waves through the soft tissue of the transmitter to the bone, and a receiver provided with a groove between the transmitter and the receiver to prevent ultrasonic interference receives the ultrasonic waves from the bone to the soft tissue of the receiver;

[0111] The transmitter transmits the ultrasonic wave through the soft tissue to the bone specifically includes: the transmitter transmits the ultrasonic wave first through the coupling agent used to exclude the air at the contact surface between the transmitter and the soft tissue, and then through the soft tissue to the bone.

[0112] The receiver having a groove between the receiver and the transmitter to prevent ultrasonic interference receives ultrasonic waves from bones to soft tissues, specifically including: the receiver having a groove between the receiver and the transmitter to prevent ultrasonic interference receives ultrasonic waves from bones to soft tissues and then to the coupling agent used to exclude air from the contact surface between the transmitter and the soft tissues.

[0113] The receiver having a groove between the receiver and the transmitter for preventing ultrasonic interference receives ultrasonic waves from bones to soft tissues and then to a coupling agent for excluding air from the contact surface between the transmitter and the soft tissue. Specifically, the receiver having a groove between the receiver and the transmitter for preventing ultrasonic interference receives ultrasonic waves from bones to soft tissues and then to a coupling agent for excluding air from the contact surface between the receiver and the soft tissue, wherein sound insulation material is added to the inner side of the outer shell of the groove for preventing ultrasonic interference, and the groove is a U-shaped groove.

[0114] S2. The controller calculates the time from when the transmitter sends out the ultrasonic wave to when the receiver receives the ultrasonic wave, and determines the bone density based on the length of time.

[0115] The embodiment of the present invention is a method embodiment corresponding to the above-mentioned device embodiment. The specific operation of the method can be understood by referring to the description of the device embodiment, which will not be repeated here.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements of the technical solutions of the embodiments of the present invention do not cause the essence of the corresponding technical solutions to deviate from the scope of this solution.

Claims

1. A device for detecting bone density, characterized in that: include, A transmitter for transmitting ultrasound waves through soft tissue at the transmitter to bones; A receiver is provided with a groove between the receiver and the transmitter to prevent ultrasonic interference, and is used to receive ultrasonic waves from the bone to the soft tissue at the receiver, wherein the groove is a U-shaped groove; The controller is connected to the transmitter and the receiver, and is used to calculate the time from when the transmitter sends out the ultrasonic wave to when the receiver receives the ultrasonic wave, and judge the bone density by the length of time.

2. The device according to claim 1, characterized in that The transmitter is specifically used to transmit ultrasonic waves through a coupling agent, and then through the soft tissue at the transmitter to the bone, wherein the coupling agent is used to exclude air from the contact surface between the transmitter and the soft tissue.

3. The device according to claim 2, characterized in that The receiver is specifically used to receive ultrasound waves from the bone to the soft tissue at the receiver and then to the coupling agent, wherein the coupling agent is used to exclude air from the contact surface between the receiver and the soft tissue.

4. A method for detecting bone density, characterized in that: Including the following steps: S1, a transmitter transmits ultrasonic waves through soft tissue at the transmitter to bones, and a receiver having a groove between the transmitter and the receiver to prevent ultrasonic interference receives the ultrasonic waves from the bones to the soft tissue at the receiver, wherein the groove is a U-shaped groove; S2. The controller calculates the time from when the transmitter sends out the ultrasonic wave to when the receiver receives the ultrasonic wave, and determines the bone density based on the length of time.

5. The method according to claim 4, characterized in that The transmitter transmits the ultrasonic wave through the soft tissue to the bone specifically includes: the transmitter transmits the ultrasonic wave first through a coupling agent used to exclude air from the contact surface between the transmitter and the soft tissue, and then through the soft tissue to the bone.

6. The method according to claim 5, characterized in that The receiver having a groove between the receiver and the transmitter to prevent ultrasonic interference receives ultrasonic waves from bones to soft tissues, specifically including: the receiver having a groove between the receiver and the transmitter to prevent ultrasonic interference receives ultrasonic waves from bones to soft tissues and then to the coupling agent used to exclude air from the contact surface between the receiver and the soft tissues.

7. The method according to claim 6, characterized in that The receiver having a groove between the transmitter and receiving ultrasonic waves from the bones to the soft tissue and then to the coupling agent used to exclude air from the contact surface between the transmitter and the soft tissue specifically includes: the receiver having a groove between the transmitter and receiving ultrasonic waves from the bones to the soft tissue and then to the coupling agent used to exclude air from the contact surface between the transmitter and the soft tissue.

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