Wearable heart ultrasound imaging patch system and imaging method

Abstract

Provided are a wearable heart ultrasound imaging patch system and an imaging method. The wearable heart ultrasound imaging patch system comprises: a control device (1), an electrical pulse generation apparatus (2), a multi-channel pulse amplification control apparatus (3), an ultrasound imaging patch system (4), a target to be imaged (5), a signal light generation apparatus (6), a signal conversion and acquisition apparatus (7), and a data processing and display apparatus (8). An electrical pulse is generated by the electrical pulse generation apparatus (2) and input into the ultrasonic imaging patch system (4) via the multi-channel pulse amplification control apparatus (3). Laser light is output by the signal light generation apparatus (6) and converted, via the signal conversion and acquisition apparatus (7), into an optical pulse signal, which is then input into the heart ultrasound imaging patch system (4). An ultrasound image of the target to be imaged (5) is acquired by the ultrasound imaging patch system (4) and transmitted to the signal conversion and acquisition apparatus (7) via an optical fiber, and the signal conversion and acquisition apparatus (7) converts an optical signal of the ultrasound image into an electrical signal and then inputs the electrical signal into the data processing and display apparatus (8). Compared with the conventional technology, the present disclosure has the phased array imaging technology incorporated and achieves acoustic detection with a large angle of view and ultra-high sensitivity.

Description

Wearable cardiac ultrasound imaging patch system and imaging method Technical Field

[0001] The present invention relates to the technical field of phased array imaging, and more particularly to a wearable cardiac ultrasound imaging patch system and an imaging method. Background Art

[0002] Continuous imaging of cardiac function is essential for long-term cardiovascular health assessment, detection of acute cardiac dysfunction, and clinical management of critically ill patients. However, traditional medical ultrasound imaging equipment is expensive, bulky, and incapable of real-time imaging. With the advent of wearable health monitoring devices, many non-invasive cardiac imaging methods have become increasingly research hotspots both domestically and internationally. Wearable imaging methods can bring health monitoring into daily life, enabling real-time monitoring of key user indicators.

[0003] However, piezoelectric or thin-film ultrasonic sensors are commonly used in current wearable integrated devices. Their limited reception bandwidth, low unit sensitivity, and narrow reception angle have hindered their practical application in detecting weak signals. Furthermore, their ultrasonic detection units are typically millimeter-sized, and their demodulation systems are complex, expensive, and susceptible to electromagnetic interference, making them difficult to meet the current demand for higher-precision wearable detection with a high signal-to-noise ratio.

[0004] The prior art discloses a phased array ultrasound patch system for bladder capacity detection. This system utilizes a linear array of five high-voltage electrical transducers, which can achieve a higher imaging angle and higher imaging resolution. However, this method results in a limited receiving angle of the array, and the back-end signal processing is relatively complex, making it difficult to truly implement daily monitoring.

[0005] To this end, in combination with the above requirements and the shortcomings of the existing technology, this application proposes a wearable cardiac ultrasound imaging patch system and imaging method.

[0006] Summary of the Invention

[0007] The present invention provides a wearable cardiac ultrasound imaging patch system and imaging method, which combines phased array imaging technology to achieve wide-viewing-angle, ultra-high-sensitivity acoustic detection, and ultimately complete real-time imaging of the heart.

[0008] The primary purpose of the present invention is to solve the above technical problems, and the technical solutions of the present invention are as follows:

[0009] A first aspect of the present invention provides a wearable cardiac ultrasound imaging patch system, which includes: a control device, an electric pulse generating device, a multi-channel pulse amplification control device, an ultrasound imaging patch system, a target to be imaged, a signal light generating device, a signal conversion and acquisition device, and a data processing and display device; the control device controls the electric pulse generating device to generate electric pulses, and inputs the electric pulses into the ultrasound imaging patch system through the multi-channel pulse amplification control device; the control device controls the signal light generating device to output laser light, which is converted into an optical pulse signal through the signal conversion and acquisition device and input into the cardiac ultrasound imaging patch system; the ultrasound imaging patch system acquires an ultrasound image of the target to be imaged, and transmits the image to the signal conversion and acquisition device via an optical fiber; the signal conversion and acquisition device converts the optical signal of the ultrasound image into an electrical signal and inputs the electrical signal into the data processing and display device.

[0010] It should be noted that the received signal is converted and stored, and then further extracted and calculated through a data processing and display device to complete real-time ultrasound imaging of the heart from different perspectives. The volume of different atria and ventricles is then extracted in conjunction with a deep learning algorithm to calculate key indicators such as the monitor's cardiovascular dynamics, cardiac output and ejection fraction.

[0011] Furthermore, the ultrasound imaging patch system includes an optical signal input optical fiber, a plurality of optical phased array imaging arrays, a module connection optical fiber and an optical signal output optical fiber; the optical phased array imaging array is arranged on a stretchable substrate, and the optical phased array imaging arrays are connected by module connection optical fibers.

[0012] Furthermore, the optical phased array imaging array includes a support structure, an optical ultrasonic sensor array, a top flexible electrode, a hollow piezoelectric film array, a bottom flexible electrode and a back absorbent substrate stacked in sequence; wherein the support structure is used to fit the skin surface, and the back absorbent substrate is arranged on a stretchable base of the ultrasonic imaging patch system.

[0013] Furthermore, the optical phased array imaging array also includes a pulley waveguide, a piezoelectric film unit and a microring sensor unit. The microring sensor unit is coupled to the pulley waveguide, and the microring sensor unit is nested in the center of the hollow piezoelectric film to receive the echo ultrasonic signal radiated by the target to be imaged.

[0014] Furthermore, the data processing and display device processes the acquired electrical signals to obtain the volumes of different atria and ventricles and key cardiac indicators.

[0015] A second aspect of the present invention provides a wearable cardiac ultrasound imaging method, which uses the wearable cardiac ultrasound imaging patch system described above. The method includes the following steps:

[0016] S1. Use the ultrasonic imaging patch system to obtain echo ultrasonic signals from different directions of the target to be imaged, convert them into electrical signals through the signal conversion and acquisition device, and then input them into the data processing and display device.

[0017] S2. Filter and reduce noise on the received data, back-project the received data to a preset area, and generate an ultrasonic image of the target to be imaged through an image reconstruction algorithm.

[0018] S3. Calculate the real-time volume of the heart ventricles based on the ultrasound image and output key cardiac indicators.

[0019] Furthermore, step S1 is specifically as follows: the ultrasonic imaging patch system emits ultrasonic waves to the target to be imaged, and the echo ultrasonic pulse signal generated by the target to be imaged is detected and received by the optical phased array imaging array. Each micro-ring sensor unit in the optical phased array imaging array collects a time series of ultrasonic signals, and after photoelectric conversion processing in the signal conversion and acquisition device, several groups of corresponding sampled electrical signal data are obtained and input into the data processing and display device.

[0020] Furthermore, step S2 is specifically as follows: using a back-projection algorithm, for each micro-ring sensor unit, the projection position of the ultrasound signal received is calculated according to the back-projection model on the target area, thereby restoring the ultrasound signal intensity at different positions of the heart and obtaining a cardiac ultrasound reconstructed image. The reconstruction algorithm process can be expressed as the following formula:

[0021] Where p(x,y) is the projection value in the target area, c(x′,y′) is the speed of sound on the projection path, and ds is the infinitesimal element of the projection path.

[0022] Furthermore, the real-time volume of the heart ventricle is calculated as follows: SV = EDV - ESV

[0023] Among them, the left ventricular end-diastolic volume EDV is the volume of the heart filled with blood at the end of diastole, and the left ventricular end-systolic volume ESV is the blood volume remaining in the heart at the end of systole.

[0024] Furthermore, the key cardiac indicators include ejection fraction, cardiac output and stroke volume.

[0025] The ejection fraction refers to the percentage of blood pumped out of the left ventricle of the heart with each beat and is calculated using the following formula:

[0026] Where EF is the ejection fraction, EDV is the ventricular end-diastolic volume, and ES is the ventricular end-systolic volume.

[0027] The cardiac output (CO) refers to the amount of blood pumped by the heart per minute, measured in liters per minute (L / min), and is calculated using the following formula: CO = SV × HR

[0028] Among them, stroke volume SV is the amount of blood pumped out with each heart beat, usually in milliliters, and heart rate HR is the number of heart beats per minute.

[0029] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0030] The present invention provides a wearable cardiac ultrasound imaging patch system and imaging method, which can utilize a hollow ultrasonic transducer for ultrasound transmission and combine it with a highly sensitive chalcogenide microring array for ultrasound reception to complete real-time cardiac ultrasound imaging. The large receiving angle of the chalcogenide microring array is utilized to achieve large-scale health imaging detection, thereby improving the detection sensitivity and receiving angle of the wearable device, enriching the wearer's understanding of the response to daily activities, and facilitating real-time monitoring and early warning of cardiovascular diseases. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic diagram of a wearable cardiac ultrasound imaging patch system according to the present invention.

[0032] FIG2 is a diagram of a cardiac ultrasound imaging patch in an embodiment of the present invention.

[0033] FIG3 is a structural diagram of an optical phased array imaging array in an embodiment of the present invention.

[0034] FIG4 is a top view of an optical phased array imaging array according to an embodiment of the present invention.

[0035] FIG5 is a flow chart of a wearable cardiac ultrasound imaging method according to the present invention. DETAILED DESCRIPTION

[0036] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0038] Example 1

[0039] As shown in Figure 1, the present invention provides a wearable cardiac ultrasound imaging patch system, which includes: a control device 1, an electric pulse generating device 2, a multi-channel pulse amplification control device 3, an ultrasound imaging patch system 4, a target to be imaged 5, a signal light generating device 6, a signal conversion and acquisition device 7, and a data processing and display device 8; the control device 1 controls the electric pulse generating device 2 to generate electric pulses, and inputs the electric pulses to the ultrasound imaging patch system 4 through the multi-channel pulse amplification control device 3; the control device 1 controls the signal light generating device 6 to output laser light, which is converted into an optical pulse signal through the signal conversion and acquisition device 7 and input into the cardiac ultrasound imaging patch system 4; the ultrasound imaging patch system 4 collects ultrasound images of the target to be imaged 5, and transmits the images to the signal conversion and acquisition device 7 through optical fiber; the signal conversion and acquisition device 7 converts the optical signal of the ultrasound image into an electrical signal and inputs the signal to the data processing and display device 8.

[0040] Among them, the control device 1 is connected to the electric pulse generating device 2 through a wire to control the intensity and pulse frequency of the ultrasonic excitation of the cardiac ultrasonic imaging patch system 4; the control device 1 is connected to the signal light generating device 6 through a data line to control the wavelength and power of the light source output by the signal light generating device 6.

[0041] As shown in Figure 2, the ultrasound imaging patch system 4 includes an optical signal input fiber 41, several optical phased array imaging arrays 42, a module connection fiber 43 and an optical signal output fiber 44; the optical phased array imaging array 42 is set on a stretchable substrate, and the optical phased array imaging arrays 42 are connected by module connection fibers 43.

[0042] In a specific embodiment, the number of optical phased array imaging arrays 42 used is 9.

[0043] As shown in Figure 3, the optical phased array imaging array 42 includes a support structure 421, an optical ultrasonic sensor array 422, a top flexible electrode 423, a hollow piezoelectric film array 424, a bottom flexible electrode 425 and a back absorbent substrate 426 stacked in sequence; the support structure 421 is used to fit the skin surface, and the back absorbent substrate 426 is set on the stretchable base of the ultrasonic imaging patch system 4.

[0044] It should be noted that, as shown in Figure 4, the ultrasonic imaging patch system 4 generates an ultrasonic pulse that is radiated onto the target to be imaged 5. After the ultrasonic signal is loaded onto the signal of the target to be imaged 5, an echo ultrasonic pulse signal is generated. The echo ultrasonic pulse signal is detected and received by the optical phased array imaging array 42. The micro-ring sensor unit 429 in the optical phased array imaging array 42 collects a time series of ultrasonic signals. After being collected by the signal conversion and acquisition device 7, several groups of sampling data are obtained. After the several groups of sampling data are transmitted to the data processing and display device 8 for processing, key indicators such as real-time ultrasonic imaging, cardiac output and ejection fraction under different perspectives of the heart are obtained.

[0045] The optical phased array imaging array 42 also includes a pulley waveguide 427, a piezoelectric film unit 428, and a microring sensor unit 429. The microring sensor unit 429 is coupled to the pulley waveguide 427 and nested in the center of the hollow piezoelectric film 428, and is used to receive the echo ultrasound signal radiated by the imaging target 5. The ends of the optical signal input fiber 41 and the optical signal output fiber 44 are connected to the next optical phased array imaging array 42 via optical fibers, completing the recording and transmission of cardiac ultrasound signals in different directions. The two optical phased array imaging arrays 42 at the beginning and end are connected to the signal light generating device 6 and the signal conversion and acquisition device 7 respectively via optical fibers.

[0046] Example 2

[0047] Based on the above embodiment 1 and in combination with FIG1 , this embodiment describes in detail the specific process of performing real-time cardiac ultrasound imaging according to the present invention.

[0048] As shown in Figure 1, the laser generator outputs laser light, which is transmitted to the optical sensor monitoring array module through the optical fiber. After the grating coupler in the module transmits the optical signal to the optical waveguide, the optical waveguide is connected to the micro-ring array to realize the real-time detection of large-scale ultrasonic signals and cardiac ultrasonic imaging. A square hollow piezoelectric composite film is integrated on the periphery of each micro-ring unit. When an electric pulse signal is input to the piezoelectric composite film, the composite film generates an ultrasonic pulse and is incident on the heart structure and the nearby new blood vessel structure. After the cardiovascular system receives the ultrasonic signal, it also generates an echo ultrasonic signal and radiates outward. The ultrasonic pulse is then transmitted to the micro-rings in the 9 groups of optical phased array imaging array modules. The cavity sensing component receives the light, converts it into an optical signal, and transmits the signal to the signal conversion and acquisition device through the optical fiber to convert the optical signal into an electrical signal. Finally, the back-end demodulation equipment completes the signal processing and image reconstruction, and completes the real-time ultrasound imaging of the heart at different angles. The volume of different atria and ventricles is extracted in conjunction with the deep learning algorithm, and the key indicators such as the monitor's cardiovascular dynamics, cardiac blood transfusion and ejection fraction are calculated. In the present invention, the hollow piezoelectric composite film is used as the signal transmitting unit, and the microcavity sensor array component inside the piezoelectric composite film is used as the sensing detection unit. It does not require the help of external mechanical equipment, has high flexibility, a large detection angle, and strong detection sensitivity.

[0049] Example 3

[0050] As shown in FIG5 , the present invention further provides a wearable cardiac ultrasound imaging method, which uses the wearable cardiac ultrasound imaging patch system described above. The method includes the following steps:

[0051] S1. Use the ultrasonic imaging patch system 4 to obtain echo ultrasonic signals of different directions of the target 5 to be imaged, convert them into electrical signals through the signal conversion and acquisition device 7, and then input them into the data processing and display device 8.

[0052] S2. Filter and reduce noise on the received data, back-project the received data to a preset area, and generate an ultrasonic image of the target 5 to be imaged through an image reconstruction algorithm.

[0053] S3. Calculate the real-time volume of the heart ventricles based on the ultrasound image and output key cardiac indicators.

[0054] Furthermore, step S1 is specifically as follows: the ultrasonic imaging patch system 4 emits ultrasonic waves to the target to be imaged 5, and the echo ultrasonic pulse signal generated by the target to be imaged 5 is detected and received by the optical phased array imaging array 42. Each micro-ring sensor unit 429 in the optical phased array imaging array 42 collects a time series of ultrasonic signals, and after the photoelectric conversion processing in the signal conversion and acquisition device 7, several groups of corresponding sampled electrical signal data are obtained and input into the data processing and display device 8.

[0055] Furthermore, step S2 is specifically as follows: using a back-projection algorithm, for each micro-ring sensor unit 429, the projection position of the ultrasound signal received is calculated according to the back-projection model on the target area, thereby restoring the ultrasound signal intensity at different positions of the heart and obtaining a cardiac ultrasound reconstructed image. The reconstruction algorithm process can be expressed as the following formula:

[0056] Where p(x,y) is the projection value in the target area, c(x′,y′) is the speed of sound on the projection path, and ds is the infinitesimal element of the projection path.

[0057] Furthermore, the real-time volume of the heart ventricle is calculated as follows: SV = EDV - ESV

[0058] The left ventricular end-diastolic volume (EDV) is the volume of blood in the heart at the end of diastole, and the left ventricular end-systolic volume (ESV) is the volume of blood remaining in the heart at the end of systole. It should be noted that the normal range of stroke volume can vary depending on individual differences and clinical conditions, but generally speaking, the stroke volume of an adult at rest is approximately 60 to 100 ml per beat.

[0059] Furthermore, the key cardiac indicators include ejection fraction, cardiac output and stroke volume.

[0060] The ejection fraction refers to the percentage of blood pumped out of the left ventricle of the heart with each beat and is calculated using the following formula:

[0061] Where EF stands for ejection fraction, EDV stands for end-diastolic volume, and ES stands for end-systolic volume. As can be seen from the formula, the ejection fraction is a volume ratio indicator that reflects the ventricular ejection function from a volumetric perspective. During ventricular contraction, the ventricles cannot eject all of their blood into the arteries. In a normal adult, the diastolic volume of the left ventricle is approximately 125 mL, and the right ventricle is approximately 137 mL. The stroke volume is 60-80 mL, meaning that a certain amount of blood remains in the ventricles after ejection. The percentage of stroke volume to diastolic volume is called the ejection fraction. A normal range of 50% is generally considered normal. The ejection fraction in a resting human is approximately 55% to 65%. The ejection fraction is related to the contractility of the myocardium. The stronger the myocardial contractility, the greater the stroke volume and the greater the ejection fraction.

[0062] The cardiac output (CO) refers to the amount of blood pumped by the heart per minute, measured in liters per minute (L / min), and is calculated using the following formula: CO = SV × HR

[0063] Stroke volume (SV) is the amount of blood pumped with each heartbeat, typically measured in milliliters, and heart rate (HR) is the number of heartbeats per minute. Normal cardiac output ranges from approximately 4.0 to 8.0 liters per minute at rest. This range may vary depending on individual differences, age, physiological status, and specific clinical circumstances.

[0064] In the embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways. A person skilled in the art will understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the program executes the steps of the above-mentioned method embodiments; and the aforementioned storage medium includes various media capable of storing program codes, such as mobile storage devices, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0065] Alternatively, if the above-mentioned embodiments of the present invention are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present invention, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes a number of instructions for causing a computer device to execute all or part of the methods described in the various embodiments of the present invention. The aforementioned storage media include various media capable of storing program code, such as mobile storage devices, ROM, RAM, magnetic disks, or optical disks.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. The icons in the accompanying drawings that describe the structural positional relationships are only for illustrative purposes and are not to be construed as limiting the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A wearable cardiac ultrasound imaging patch system, characterized in that: The system comprises: a control device (1), an electric pulse generating device (2), a multi-channel pulse amplifying control device (3), an ultrasonic imaging patch system (4), a target to be imaged (5), a signal light generating device (6), a signal conversion and acquisition device (7), and a data processing and display device (8); the control device (1) controls the electric pulse generating device (2) to generate electric pulses, and inputs the electric pulses to the ultrasonic imaging patch system (4) through the multi-channel pulse amplifying control device (3); the control device (1) controls the signal light generating device (6) to output laser light, which is converted into an optical pulse signal through the signal conversion and acquisition device (7) and inputted into the cardiac ultrasonic imaging patch system (4); the ultrasonic imaging patch system (4) acquires an ultrasonic image of the target to be imaged (5), and transmits the image to the signal conversion and acquisition device (7) through an optical fiber; the signal conversion and acquisition device (7) converts the optical signal of the ultrasonic image into an electrical signal and inputs the electrical signal into the data processing and display device (8).

2. A wearable cardiac ultrasound imaging patch system according to claim 1, characterized in that: The ultrasound imaging patch system (4) comprises an optical signal input optical fiber (41), a plurality of optical phased array imaging arrays (42), a module connection optical fiber (43) and an optical signal output optical fiber (44); the optical phased array imaging arrays (42) are arranged on a stretchable substrate, and the optical phased array imaging arrays (42) are connected via the module connection optical fiber (43).

3. A wearable cardiac ultrasound imaging patch system according to claim 2, characterized in that: The optical phased array imaging array (42) includes a support structure (421), an optical ultrasonic sensor array (422), a top flexible electrode (423), a hollow piezoelectric film array (424), a bottom flexible electrode (425), and a back absorbing substrate (426) stacked in sequence; The support structure (421) is used to fit the skin surface, and the back absorbent substrate (426) is arranged on the stretchable base of the ultrasound imaging patch system (4).

4. A wearable cardiac ultrasound imaging patch system according to claim 3, characterized in that: The optical phased array imaging array (42) further includes a pulley waveguide (427), a piezoelectric film unit (428) and a micro-ring sensing unit (429). The micro-ring sensing unit (429) is coupled to the pulley waveguide (427), and the micro-ring sensing unit (429) is nested in the center of the hollow piezoelectric film (428) for receiving an echo ultrasonic signal radiated by a target to be imaged (5).

5. The wearable cardiac ultrasound imaging patch system according to claim 1, characterized in that: The data processing and display device (8) processes the acquired electrical signals to obtain the volumes of different atria and ventricles and key cardiac indicators.

6. A wearable cardiac ultrasound imaging method, the system using a wearable cardiac ultrasound imaging patch system according to any one of claims 1 to 5, characterized in that: This method comprises the following steps: S1. Using an ultrasonic imaging patch system (4) to obtain echo ultrasonic signals in different directions of a target to be imaged (5), converting them into electrical signals through a signal conversion and acquisition device (7) and then inputting them into a data processing and display device (8); S2, filtering and noise reduction processing are performed on the received data, back-projecting the received data to a preset area, and generating an ultrasound image of the target to be imaged (5) through an image reconstruction algorithm; S3. Calculate the real-time volume of the heart ventricles based on the ultrasound image and output key cardiac indicators.

7. A wearable cardiac ultrasound imaging method according to claim 6, characterized in that: The step S1 is specifically as follows: the ultrasonic imaging patch system (4) emits ultrasonic waves to the target to be imaged (5), and the optical phased array imaging array (42) detects and receives the echo ultrasonic pulse signal generated by the target to be imaged (5), and each micro-ring sensor unit (429) in the optical phased array imaging array (42) collects a time series of ultrasonic signals, and after the photoelectric conversion processing in the signal conversion and acquisition device (7), a corresponding number of groups of sampled electrical signal data are obtained and input into the data processing and display device (8).

8. A wearable cardiac ultrasound imaging method according to claim 7, characterized in that: The step S2 specifically comprises: using a back projection algorithm, calculating the projection position of the ultrasound signal received by each micro-ring sensor unit (429) on the target area according to the back projection model, thereby restoring the ultrasound signal intensity at different positions of the heart and obtaining a cardiac ultrasound reconstructed image. The reconstruction algorithm process can be expressed as the following formula: Where p(x,y) is the projection value in the target area, c(x′,y′) is the speed of sound on the projection path, and ds is the infinitesimal element of the projection path.

9. The wearable cardiac ultrasound imaging method according to claim 7, wherein: The real-time volume calculation method of the heart ventricle is: SV = EDV - ESV Among them, the left ventricular end-diastolic volume EDV is the volume of the heart filled with blood at the end of diastole, and the left ventricular end-systolic volume ESV is the blood volume remaining in the heart at the end of systole.

10. A wearable cardiac ultrasound imaging method according to claim 9, characterized in that: The key cardiac indicators include: ejection fraction, cardiac output and stroke volume; The ejection fraction refers to the percentage of blood pumped out of the left ventricle of the heart with each beat and is calculated using the following formula: Where EF is ejection fraction, EDV is ventricular end-diastolic volume, and ES is ventricular end-systolic volume; The cardiac output (CO) refers to the amount of blood pumped by the heart per minute, in liters per minute (L / min), and is calculated using the following formula: CO=SV×HR Among them, stroke volume SV is the amount of blood pumped out with each heart beat, usually in milliliters, and heart rate HR is the number of heart beats per minute.

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