Cardiac phase determination apparatus, method, medium, and electronic device

Abstract

The application provides a cardiac phase judgment device, method, medium and electronic equipment. The device comprises: a medical image acquisition module, configured to acquire a plurality of three-dimensional medical images of a target object in at least one cardiac cycle; a myocardial wall thickness acquisition module, configured to acquire the thickness of a left ventricular myocardial wall in each frame of the three-dimensional medical images; and a cardiac phase judgment module, configured to acquire the cardiac phase of the target object according to the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical images. The cardiac phase judgment device only needs to acquire the cardiac phase of the target object according to the three-dimensional medical images of the target object, and is simpler to implement.

Description

Technical Field

[0001] This invention relates to the field of image processing, and in particular to a cardiac phase determination device, method, medium, and electronic device. Background Technology

[0002] In recent years, with the continuous development of medical imaging, using patients' medical images to assist in the diagnosis of heart diseases has become a common clinical practice. Obtaining the cardiac phases is crucial in the diagnosis of heart diseases. Current methods for obtaining cardiac phases involve acquiring the patient's ECG signal simultaneously with medical imaging and determining the phase of cardiac pulsation based on the ECG signal. However, this method requires acquiring the patient's ECG signal at the same time as acquiring medical images, making it relatively complex to implement. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a cardiac phase determination device, method, medium, and electronic device to solve the above-mentioned problems existing in the prior art.

[0004] To achieve the above and other related objectives, a first aspect of the present invention provides a cardiac phase determination device based on myocardial wall thickness. The device includes: a medical image acquisition module for acquiring multiple frames of three-dimensional medical images of a target object within at least one cardiac cycle; a myocardial wall thickness acquisition module for acquiring the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical images; and a cardiac phase determination module for determining the cardiac phase of the target object based on the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical images.

[0005] In one embodiment of the first aspect, the myocardial wall thickness acquisition module includes a first myocardial wall thickness acquisition unit and a second myocardial wall thickness acquisition unit, and for any frame of the three-dimensional medical image: the first myocardial wall thickness acquisition unit is used to acquire the thickness of the left ventricular myocardial wall in each target axial two-dimensional plane in the frame of the three-dimensional medical image, wherein the target axial two-dimensional plane refers to an axial two-dimensional plane containing the left ventricular myocardial wall; the second myocardial wall thickness acquisition unit is used to acquire the thickness of the left ventricular myocardial wall in the frame of the three-dimensional medical image based on the thickness of the left ventricular myocardial wall in each target axial two-dimensional plane in the frame of the three-dimensional medical image.

[0006] In one embodiment of the first aspect, for any of the target axial two-dimensional layers, the first myocardial wall thickness acquisition unit acquires the thickness of the left ventricular myocardial wall of the target axial two-dimensional layer based on the number of pixels of the left ventricular myocardial wall contained in the target axial two-dimensional layer.

[0007] In one embodiment of the first aspect, for any frame of the three-dimensional medical image, the second myocardial wall thickness acquisition unit acquires the average thickness of the left ventricular myocardial wall in each target axis two-dimensional plane of the three-dimensional medical image as the thickness of the left ventricular myocardial wall in the three-dimensional medical image.

[0008] In one embodiment of the first aspect, the first myocardial wall thickness acquisition unit is further configured to segment each frame of the three-dimensional medical image to obtain the segmentation result of the left ventricular myocardial wall in each frame of the three-dimensional medical image, and to obtain the target axial two-dimensional layer in each frame of the three-dimensional medical image based on the segmentation result.

[0009] In one embodiment of the first aspect, the cardiac phase determination module obtains the cardiac phase of the target object based on the three-dimensional medical image frame with the greatest thickness of the left ventricular myocardial wall and the three-dimensional medical image frame with the smallest thickness of the left ventricular myocardial wall.

[0010] In one embodiment of the first aspect, the left ventricular function assessment module is used to assess the left ventricular function of the target object based on the extreme values ​​of the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical images.

[0011] A second aspect of the present invention provides a method for determining cardiac phase based on myocardial wall thickness, the method comprising: acquiring multiple frames of three-dimensional medical images of a target object within at least one cardiac cycle; acquiring the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical images; and acquiring the cardiac phase of the target object based on the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical images.

[0012] A third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the cardiac phase determination method based on myocardial wall thickness as described in the second aspect of the present invention.

[0013] A fourth aspect of the present invention provides an electronic device comprising: a memory storing a computer program; and a processor communicatively connected to the memory, wherein the processor, when the computer program is invoked, executes the cardiac phase determination method based on myocardial wall thickness as described in the second aspect of the present invention.

[0014] As described above, the cardiac phase determination device in one or more embodiments of the present invention has the following beneficial effects:

[0015] The cardiac phase determination device can acquire the thickness of the left ventricular myocardial wall in multiple frames of three-dimensional medical images of a target object within at least one cardiac cycle, and obtain the cardiac phase of the target object based on this thickness. Compared with the prior art, the cardiac phase determination device can obtain the cardiac phase of the target object based solely on the three-dimensional medical images, thus eliminating the need to acquire the patient's ECG signal simultaneously with the acquisition of medical images, making it simpler to implement. Attached Figure Description

[0016] Figure 1 The diagram shown is a structural schematic of the cardiac phase determination device according to a specific embodiment of the present invention.

[0017] Figure 2A The diagram shown is a structural schematic of the cardiac wall thickness acquisition module in a specific embodiment of the cardiac phase determination device of the present invention.

[0018] Figure 2B The image shown is an example of a three-dimensional medical image in a specific embodiment of the cardiac phase determination device of the present invention.

[0019] Figure 2C The image shown is an example diagram of the axial two-dimensional plane of the cardiac phase determination device described in this invention in a specific embodiment.

[0020] Figure 3 The flowchart shown is a specific embodiment of the cardiac phase determination method described in this invention.

[0021] Figure 4 The diagram shown is a structural schematic of the electronic device described in a specific embodiment of the present invention.

[0022] Component designation explanation

[0023] 1. Cardiac Phase Determination Device

[0024] 11 Medical Image Acquisition Module

[0025] 12. Heart Wall Thickness Acquisition Module

[0026] 121 First Myocardial Wall Thickness Acquisition Unit

[0027] 122 Second Myocardial Wall Thickness Acquisition Unit

[0028] 13. Cardiac Phase Determination Module

[0029] 400 Electronic Devices

[0030] 410 Memory

[0031] 420 processor

[0032] 430 monitor

[0033] Steps S31 to S33 Detailed Implementation

[0034] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0035] It should be noted that the illustrations provided in the following embodiments are merely schematic representations of the basic concept of the present invention. The illustrations only show components relevant to the present invention and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the component layout may also be more complex. Furthermore, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0036] Existing methods for obtaining cardiac phases involve acquiring the patient's ECG signal simultaneously with medical imaging and determining the phase of cardiac pulsation based on the ECG signal. However, this method requires acquiring the patient's ECG signal while acquiring medical imaging, making it relatively complex to implement. To address this issue, the inventors, through research and practice, discovered that the left ventricle has the thickest wall, and its thickness is related to different cardiac phases. This is because the left ventricle is the heart's primary pumping organ; its contraction pumps blood to the aorta, maintaining effective blood pressure in the systemic circulation and ensuring a sufficient blood supply to the body's vital organs. Due to the high resistance in systemic circulation, the heart needs to exert considerable effort to pump blood effectively, hence the left ventricle's thickest wall, and its thickness is related to different cardiac phases. Based on this, the inventors proposed a cardiac phase determination device based on myocardial wall thickness. For details, please refer to [link to relevant documentation]. Figure 1 In one embodiment of the present invention, the cardiac phase determination device 1 includes a medical image acquisition module 11, a myocardial wall thickness acquisition module 12, and a cardiac phase determination module 13.

[0037] The medical image acquisition module 11 is used to acquire multiple frames of three-dimensional medical images of a target object within at least one cardiac cycle. The target object is, for example, a patient or subject, and the cardiac cycle of the target object refers to the time period from the start of one heartbeat to the start of the next heartbeat. The medical image acquisition module 11 can acquire the three-dimensional medical images from medical scanning equipment such as a CT scanner, from a corresponding medical image database, or from a three-dimensional image reconstruction device; this invention does not limit the acquisition of these images.

[0038] The myocardial wall thickness acquisition module 12 is connected to the medical image acquisition module 11 and is used to acquire the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical image.

[0039] The cardiac phase determination module 13 is connected to the myocardial wall thickness acquisition module 12 and is used to obtain the cardiac phase of the target object based on the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical images. The cardiac phase of the target object includes systole and / or diastole. Specifically, the inventors have discovered through research and practice that the thickness of the left ventricular myocardial wall in the human body is related to the cardiac phase; the maximum thickness of the left ventricular myocardial wall corresponds to the systole phase, and the minimum thickness corresponds to the diastole phase. Based on this, the cardiac phase determination module 13 can obtain the cardiac phase of the target object based on the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical images.

[0040] As described above, the cardiac phase determination device 1 of this embodiment can acquire the thickness of the left ventricular myocardial wall in multiple frames of three-dimensional medical images of a target object within at least one cardiac cycle, and obtain the cardiac phase of the target object based on this thickness. Compared with the prior art, the cardiac phase determination device 1 only needs to acquire the cardiac phase of the target object based on the three-dimensional medical images, thus eliminating the need to acquire the patient's ECG electrocardiogram signal simultaneously with the acquisition of medical images, making it simpler to implement.

[0041] Please see Figure 2A In one embodiment of the present invention, the myocardial wall thickness acquisition module 12 includes a first myocardial wall thickness acquisition unit 121 and a second myocardial wall thickness acquisition unit 122. The first myocardial wall thickness acquisition unit 121 is connected to the medical image acquisition module 11, and the second myocardial wall thickness acquisition unit 122 is connected to the first myocardial wall thickness acquisition unit 121 and the cardiac phase acquisition unit 13.

[0042] For any frame of the three-dimensional medical image A, in this embodiment, the first myocardial wall thickness acquisition unit 121 is used to acquire the thickness of the left ventricular myocardial wall in each target axial two-dimensional plane in that frame of the three-dimensional medical image A. The target axial two-dimensional plane refers to the axial two-dimensional plane containing the left ventricular myocardial wall. For example, please refer to Figure 2B and Figure 2C The images are displayed as a frame of a three-dimensional medical image and an example image of one axial two-dimensional layer. Figure 2C The axial two-dimensional plane shown includes the left ventricular myocardial wall, and therefore this axial two-dimensional plane is a target axial two-dimensional plane of this frame of three-dimensional medical image.

[0043] The second myocardial wall thickness acquisition unit 122 is used to acquire the thickness of the left ventricular myocardial wall in the three-dimensional medical image A based on the thickness of the left ventricular myocardial wall in each of the target axial two-dimensional layers in the three-dimensional medical image A. Specifically, the three-dimensional medical image A can be regarded as being obtained by superimposing multiple two-dimensional axial layers along a specific direction. Therefore, the left ventricular myocardial wall in the three-dimensional medical image A can be regarded as being obtained by superimposing the left ventricular myocardial walls contained in each target two-dimensional layer. Thus, it can be seen that the thickness of the left ventricular myocardial wall in the three-dimensional medical image A can be obtained based on the thickness of the left ventricular myocardial wall in each target two-dimensional layer in the three-dimensional medical image A.

[0044] Optionally, for any of the target axial two-dimensional layers a, the thickness of the left ventricular myocardial wall in the target axial two-dimensional layer a is positively correlated with the number of pixels of the left ventricular myocardial wall in the target axial two-dimensional layer a. Therefore, the first myocardial wall thickness acquisition unit 121 acquires the thickness of the left ventricular myocardial wall of the target axial two-dimensional layer a based on the number of pixels of the left ventricular myocardial wall contained in the target axial two-dimensional layer a. For example, the first myocardial wall thickness acquisition unit 121 can acquire the total number of pixels in the target axial two-dimensional layer a as the thickness of the left ventricular myocardial wall of the target axial two-dimensional layer a.

[0045] Optionally, for any frame of the three-dimensional medical image B, the second myocardial wall thickness acquisition unit 122 acquires the average thickness of the left ventricular myocardial wall in each of the target axial two-dimensional planes in the frame of the three-dimensional medical image B as the thickness of the left ventricular myocardial wall in the frame of the three-dimensional medical image B. Specifically, when the heart is in systole, there are fewer axial two-dimensional planes containing the myocardial wall; when the heart is in diastole, there are more axial two-dimensional planes containing the myocardial wall. Therefore, for the frame of the three-dimensional medical image B, the thickness of the left ventricular myocardial wall can be obtained based on the average thickness of the left ventricular myocardial wall in each of the target axial two-dimensional planes, thereby determining whether the heart is in systole or diastole.

[0046] Preferably, one method for obtaining the average thickness of the left ventricular myocardial wall in each target axis two-dimensional layer of the three-dimensional medical image B is as follows: obtain the total number of pixels of the left ventricular myocardial wall contained in each target axis two-dimensional layer of the three-dimensional medical image B, and obtain the total number of layers of the target axis two-dimensional layers contained in the three-dimensional medical image B. The ratio of the total number of pixels to the total number of layers is the average thickness of the left ventricular myocardial wall in each target axis two-dimensional layer of the three-dimensional medical image B.

[0047] Optionally, the first myocardial wall thickness acquisition unit 121 is further configured to segment each frame of the three-dimensional medical image to obtain the segmentation result of the left ventricular myocardial wall in each frame of the three-dimensional medical image, and to obtain the target axial two-dimensional layer in each frame of the three-dimensional medical image based on the segmentation result, wherein the segmentation result is, for example, a mask of the left ventricular myocardial wall.

[0048] As can be seen from the above description, this embodiment provides a method for obtaining the thickness of the left ventricular myocardial wall in three-dimensional medical images. However, the present invention is not limited thereto. For example, in practical applications, the thickness of the left ventricular myocardial wall in three-dimensional medical images can also be obtained by automatic measurement by software or manual measurement.

[0049] In one embodiment of the present invention, the cardiac phase determination module 13 obtains the cardiac phase of the target object based on the three-dimensional medical image frame with the greatest left ventricular myocardial wall thickness and the three-dimensional medical image frame with the least left ventricular myocardial wall thickness. Specifically, the three-dimensional medical image frame with the greatest left ventricular myocardial wall thickness corresponds to the systolic phase of the heart, and the three-dimensional medical image frame with the least left ventricular myocardial wall thickness corresponds to the diastolic phase of the heart.

[0050] In one embodiment of the present invention, the cardiac phase determination device further includes a left ventricular function assessment module. The left ventricular function assessment module is used to assess the left ventricular function of the target object based on the extreme values ​​of the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical images.

[0051] Optionally, the left ventricular function assessment module can obtain a curve showing the average number of pixels in the myocardial wall in an axial two-dimensional plane. This curve reflects the change in the thickness of the left ventricular myocardial wall over time in each frame of the three-dimensional medical image. The left ventricular function assessment module can obtain the extreme value of this curve as the extreme value of the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical image. When the thickness of the left ventricular myocardial wall is at its maximum value, it corresponds to the systolic phase of the heart. When the thickness of the left ventricular myocardial wall is at its minimum value, it corresponds to the diastolic phase of the heart.

[0052] Optionally, the left ventricular function assessment module includes: a systolic volume acquisition unit for acquiring the systolic volume of the left ventricle; a diastolic volume acquisition unit for acquiring the diastolic volume of the left ventricle; and a left ventricular function parameter acquisition unit for obtaining left ventricular function parameters based on the systolic and diastolic volumes of the left ventricle. Specifically, the three-dimensional medical images corresponding to the diastolic and systolic phases are segmented into cardiac chambers, and the systolic and diastolic volumes of the left ventricle are obtained based on the left ventricular segmentation results. The ratio of the systolic to diastolic volume of the left ventricle is used as the left ventricular function parameter.

[0053] Based on the above description of the cardiac phase determination device, the present invention also provides a method for determining cardiac phases. Specifically, please refer to... Figure 3 In one embodiment of the present invention, the method for determining cardiac phase includes:

[0054] S31, acquire multiple frames of three-dimensional medical images of the target object within at least one cardiac cycle.

[0055] S32, obtain the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical image.

[0056] S33, obtain the cardiac phase of the target object based on the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical image.

[0057] It should be noted that the above steps S31 to S33 are the same as... Figure 1 The corresponding modules in the cardiac phase determination device 1 shown are one-to-one, and will not be elaborated on here to save space in the instruction manual.

[0058] Based on the above description of the cardiac phase determination method, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements... Figure 3 The method for determining cardiac phases based on myocardial wall thickness is shown.

[0059] Based on the above description of the cardiac phase determination method, the present invention also provides an electronic device. Specifically, please refer to... Figure 4 In one embodiment of the present invention, the electronic device 400 includes a memory 410 and a processor 420, wherein the memory 410 stores a computer program, and the processor 420 is communicatively connected to the memory 410 and executes the computer program when invoked. Figure 3 The method for determining cardiac phases based on myocardial wall thickness is shown.

[0060] Optionally, the electronic device 400 may further include a display 430, which is communicatively connected to the memory 410 and the processor 420, and is used to display the relevant GUI interactive interface of the cardiac phase determination method.

[0061] The scope of protection of the cardiac phase determination method described in this invention is not limited to the execution order of the steps listed in this embodiment. Any solution implemented by adding, subtracting, or replacing steps in the prior art based on the principles of this invention is included within the scope of protection of this invention.

[0062] The present invention also provides a cardiac phase determination device, which can implement the cardiac phase determination method described in the present invention. However, the implementation device of the cardiac phase determination method described in the present invention includes, but is not limited to, the structure of the cardiac phase determination device listed in this embodiment. All structural modifications and substitutions of the prior art made in accordance with the principles of the present invention are included within the protection scope of the present invention.

[0063] In summary, the cardiac phase determination device can acquire the thickness of the left ventricular myocardial wall in multiple frames of three-dimensional medical images of a target object within at least one cardiac cycle, and obtain the cardiac phase of the target object based on this thickness. Compared with the prior art, the cardiac phase determination device only needs to acquire the cardiac phase of the target object based on the three-dimensional medical images, thus eliminating the need to acquire the patient's ECG signal simultaneously with the medical images, making it simpler to implement. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A cardiac phase determination device based on myocardial wall thickness, characterized in that, The device includes: The medical image acquisition module is used to acquire multiple frames of three-dimensional medical images of the target object within at least one cardiac cycle. The myocardial wall thickness acquisition module is used to acquire the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical image. The cardiac phase determination module is used to obtain the cardiac phase of the target object based on the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical image, wherein the maximum thickness of the left ventricular myocardial wall corresponds to the systolic phase of the heart, and the minimum thickness of the left ventricular myocardial wall corresponds to the diastolic phase of the heart. The left ventricular function assessment module is used to obtain an average number of pixels of the myocardial wall in an axial two-dimensional plane by fitting, obtain the extreme value of the curve as the extreme value of the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical image, and evaluate the left ventricular function of the target object based on the extreme value of the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical image. The curve is used to reflect the change law of the thickness of the left ventricular myocardial wall over time in each frame of the three-dimensional medical image. The myocardial wall thickness acquisition module includes a first myocardial wall thickness acquisition unit and a second myocardial wall thickness acquisition unit. For any frame of the three-dimensional medical image, the first myocardial wall thickness acquisition unit is used to acquire the thickness of the left ventricular myocardial wall in each target axial two-dimensional plane in the frame of the three-dimensional medical image, wherein the target axial two-dimensional plane refers to an axial two-dimensional plane containing the left ventricular myocardial wall. The second myocardial wall thickness acquisition unit is used to acquire the thickness of the left ventricular myocardial wall in the frame of the three-dimensional medical image based on the thickness of the left ventricular myocardial wall in each target axial two-dimensional plane in the frame of the three-dimensional medical image, wherein the second myocardial wall thickness acquisition unit acquires the average thickness of the left ventricular myocardial wall in each target axial two-dimensional plane in the frame of the three-dimensional medical image as the thickness of the left ventricular myocardial wall in the frame of the three-dimensional medical image. The left ventricular function assessment module includes a systolic volume acquisition unit and a left ventricular function parameter acquisition unit. The systolic volume acquisition unit is used to acquire the systolic volume of the left ventricle, and the diastolic volume acquisition unit is used to acquire the diastolic volume of the left ventricle. The ratio of the systolic volume of the left ventricle to the diastolic volume of the left ventricle is used as the left ventricular function parameter.

2. The apparatus according to claim 1, characterized in that: For any of the target axial two-dimensional layers, the first myocardial wall thickness acquisition unit acquires the thickness of the left ventricular myocardial wall in the target axial two-dimensional layer based on the number of pixels of the left ventricular myocardial wall contained in the target axial two-dimensional layer.

3. The apparatus according to claim 1, characterized in that: The first myocardial wall thickness acquisition unit is also used to segment each frame of the three-dimensional medical image to obtain the segmentation result of the left ventricular myocardial wall in each frame of the three-dimensional medical image, and to obtain the target axial two-dimensional layer in each frame of the three-dimensional medical image based on the segmentation result.

4. The apparatus according to claim 1, characterized in that: The cardiac phase determination module obtains the cardiac phase of the target object based on the three-dimensional medical image frame with the greatest thickness of the left ventricular myocardial wall and the three-dimensional medical image frame with the smallest thickness of the left ventricular myocardial wall.

5. A method for determining cardiac phases based on myocardial wall thickness, characterized in that, The method includes: Acquire multiple frames of 3D medical images of the target object within at least one cardiac cycle; Obtain the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical image; The cardiac phase of the target object is obtained based on the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical image, wherein the maximum thickness of the left ventricular myocardial wall corresponds to the systolic phase of the heart, and the minimum thickness of the left ventricular myocardial wall corresponds to the diastolic phase of the heart. A curve showing the average number of pixels in the myocardial wall in an axial two-dimensional plane is obtained by fitting. The extreme value of the curve is taken as the extreme value of the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical image. The left ventricular function of the target object is evaluated based on the extreme value of the thickness of the left ventricular myocardial wall in each frame of the three-dimensional medical image. The curve is used to reflect the change law of the thickness of the left ventricular myocardial wall over time in each frame of the three-dimensional medical image. The systolic volume and diastolic volume of the left ventricle are obtained, and the ratio of the systolic volume to the diastolic volume of the left ventricle is used as a left ventricular function parameter. For any frame of the three-dimensional medical image, the thickness of the left ventricular myocardial wall in each target axis two-dimensional layer of the three-dimensional medical image is obtained, and the thickness of the left ventricular myocardial wall in the three-dimensional medical image is obtained based on the thickness of the left ventricular myocardial wall in each target axis two-dimensional layer of the three-dimensional medical image. The target axis two-dimensional layer refers to the axis two-dimensional layer containing the left ventricular myocardial wall. The maximum thickness of the left ventricular myocardial wall corresponds to the systolic phase of the heart, and the minimum thickness of the left ventricular myocardial wall corresponds to the diastolic phase of the heart. Obtaining the thickness of the left ventricular myocardial wall in the three-dimensional medical image frame based on the thickness of the left ventricular myocardial wall in each target axis two-dimensional plane in the three-dimensional medical image frame includes: obtaining the average thickness of the left ventricular myocardial wall in each target axis two-dimensional plane in the three-dimensional medical image frame as the thickness of the left ventricular myocardial wall in the three-dimensional medical image frame.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When executed by a processor, the computer program implements the cardiac phase determination method based on myocardial wall thickness as described in claim 5.

7. An electronic device, characterized in that, The electronic device includes: A memory that stores a computer program; The processor, which is communicatively connected to the memory, executes the cardiac phase determination method based on myocardial wall thickness as described in claim 5 when it calls the computer program.

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