Cardiac scanning method and apparatus for medical device, medical device

Abstract

This application relates to the field of medical device technology and discloses a cardiac scanning method for a medical device, comprising: acquiring a first heart rate based on the real-time heart rate; acquiring an estimated remaining time for cardiac scanning when the first heart rate is lower than a second heart rate; wherein the second heart rate represents a reference heart rate before scanning; acquiring an estimated remaining thermal capacity corresponding to the estimated remaining time; and adjusting the current scanning parameters when the estimated remaining thermal capacity is greater than the actual remaining thermal capacity, so that the thermal capacity corresponding to the adjusted scanning parameters within the estimated remaining time is not greater than the actual remaining thermal capacity. By adjusting the scanning parameters, the risk of scanning failure due to thermal capacity limitations is reduced, ensuring that even if heart rate changes cause scanning time to be extended, scanning will not be interrupted due to insufficient thermal capacity. This application also discloses a cardiac scanning device and a medical device for use in medical devices.

Description

Technical Field

[0001] This application relates to the field of medical device technology, such as a cardiac scanning method and apparatus for medical devices, and medical devices. Background Technology

[0002] Cardiac CT (Computed Tomography) is a medical imaging technique that creates cross-sectional images of the heart and other internal structures by combining multiple X-ray images. Cardiac CT can be used to assess the structure and function of the heart, including its size, shape, and the condition of its chambers and blood vessels. It is used to diagnose various heart diseases, such as coronary artery disease, cardiomyopathy, cardiac tumors, valvular heart disease, and congenital heart disease. Because the state of the heart is variable, especially when it is diseased, different CT scan modes are needed for different states of the heart.

[0003] To enable cardiac CT to be applied to different cardiac conditions, a cardiac scanning method has been disclosed, including: determining the scanning duration in multiple cardiac scanning modes; and determining the target scanning mode of the cardiac scanning device based on the scanning duration corresponding to each cardiac scanning mode.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] While related technologies allow for the setting of different scanning modes, these modes are all determined based on the scan duration. In practical applications, fluctuations in heart rate can cause changes in the expected scan duration, making it difficult to determine the appropriate scanning mode.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a cardiac scanning method and apparatus for medical devices, and a medical device capable of completing scanning and imaging under real-time heart rate fluctuations.

[0009] In some embodiments, the cardiac scanning method for a medical device includes: obtaining a first heart rate based on the real-time heart rate; obtaining an estimated remaining time for cardiac scanning if the first heart rate is lower than a second heart rate; wherein the second heart rate represents a reference heart rate before scanning; obtaining an estimated remaining heat capacity corresponding to the estimated remaining time; and adjusting current scanning parameters if the estimated remaining heat capacity is greater than the actual remaining heat capacity, so that the heat capacity corresponding to the adjusted scanning parameters within the estimated remaining time is not greater than the actual remaining heat capacity.

[0010] Optionally, obtaining a first heart rate based on the real-time heart rate includes: identifying multiple R peaks of the electrocardiogram signal; calculating multiple real-time heart rates based on the time between two adjacent R peaks; and selecting the lowest real-time heart rate among the multiple real-time heart rates as the first heart rate.

[0011] Optionally, the estimated remaining time for the cardiac scan is obtained, including: obtaining the phase range of the scanned phases; and obtaining the estimated remaining time based on the total scan phase range, the scanned phase range, and the first heart rate.

[0012] Alternatively, the estimated remaining time can be obtained using the following formula:

[0013]

[0014] Where T is the estimated remaining time, [PhaseBegin, PhaseEnd] is the total scan phase range, T2 is the scanned time, T3 is the time corresponding to the data required to reconstruct one phase image, HR1 is the first heart rate, and HR2 is the second heart rate. This represents the range of phases that have been scanned.

[0015] Optionally, the cardiac scanning method for a medical device includes: obtaining tube voltage and tube current under current scanning parameters; and obtaining the expected remaining heat capacity based on the tube voltage and tube current under the current scanning parameters and the expected remaining time.

[0016] Optionally, the current scan parameters can be adjusted, including: obtaining the tube current parameters and / or tube voltage parameters to be adjusted based on the actual remaining heat capacity and the expected remaining time.

[0017] Optionally, the cardiac scanning method for a medical device further includes: maintaining the current scanning parameters to perform scanning imaging when the first heart rate is higher than or equal to the second heart rate.

[0018] Optionally, the reference heart rate includes one of the following: the slowest heart rate, the average heart rate, and the estimated heart rate based on a baseline heart rate, which is either the slowest or the average heart rate, as calculated before the scan.

[0019] In some embodiments, the cardiac scanning apparatus for a medical device includes a processor and a memory storing program instructions, the processor being configured to perform the cardiac scanning method for a medical device as described above when the program instructions are executed.

[0020] In some embodiments, the medical device includes: a medical device body; and a cardiac scanning device for a medical device, as described above, mounted on the medical device body.

[0021] The cardiac scanning method and apparatus for medical devices and the medical devices provided in this disclosure can achieve the following technical effects:

[0022] In this embodiment, CT scan parameters are dynamically adjusted by real-time monitoring of the patient's electrocardiogram (ECG) signal to ensure successful scanning and high-quality image generation even with changes in heart rate. First, a first heart rate is acquired during the scan based on the real-time heart rate. When the first heart rate is lower than the reference heart rate before the scan, the estimated remaining time for the cardiac scan is recalculated, and the estimated remaining thermal capacity is calculated based on the new heart rate and scan parameters. If the estimated remaining thermal capacity exceeds the actual remaining thermal capacity of the device, the scan parameters are adjusted to adapt to the new scan conditions. Thus, this embodiment reduces the risk of scan failure due to thermal capacity limitations by adjusting the scan parameters, ensuring that the scan is not interrupted due to insufficient thermal capacity even when heart rate changes lead to extended scan times.

[0023] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0024] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0025] Figure 1 This is a schematic diagram of the implementation environment of the cardiac scanning method for medical devices according to an embodiment of this disclosure;

[0026] Figure 2 This is a schematic diagram of a cardiac scanning method for a medical device provided in an embodiment of this disclosure;

[0027] Figure 3 This is a schematic diagram of another cardiac scanning method for a medical device provided in an embodiment of this disclosure;

[0028] Figure 4 This is a schematic diagram illustrating the correspondence between an electrocardiogram signal and tube current according to an embodiment of this disclosure;

[0029] Figure 5 This is a schematic diagram of another cardiac scanning method for a medical device provided in an embodiment of this disclosure;

[0030] Figure 6 This is a schematic diagram of a cardiac scanning device for medical devices provided in an embodiment of this disclosure. Detailed Implementation

[0031] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0032] The terms "first," "second," etc., used in the technical solutions described in this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0033] Unless otherwise stated, the term "multiple" means two or more.

[0034] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0035] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0036] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0037] Currently, cardiac CT scans estimate the required exposure time based on the patient's pre-scan electrocardiogram (ECG) signals, calculating the time corresponding to the slowest heart rate and adding redundancy. However, during the actual scan, the heart's state changes in real time, and the heart rate fluctuates. There are instances where the actual heart rate is lower than the pre-scanned slowest heart rate, leading to a longer actual exposure time than the estimated time. If the actual required exposure time exceeds the system's maximum supported exposure time, no X-rays will be generated, resulting in scan failure. To avoid scan failure due to exceeding the estimated exposure time, if the heart rate changes during the scan, the exposure time needs to be recalculated, and scan parameters adjusted to ensure successful scan completion.

[0038] Figure 1 This is a schematic diagram illustrating the implementation environment of a cardiac scanning method for a medical device according to an embodiment of this disclosure. Figure 1 As shown, the implementation environment may include a CT device 10 and an electrocardiogram device 20. The CT device includes a high-voltage system 100 and a processor 600.

[0039] In the CT equipment 10, a high-voltage system 100 is used to generate high voltage, thereby providing energy for the X-rays emitted by the X-ray tube. The high-voltage system 100 converts a low-voltage power supply into a high voltage, which is then supplied to the cathode and anode of the X-ray tube. The high voltage accelerates electrons from the cathode to the anode, generating X-rays on the anode target. The efficiency and stability of the high-voltage system directly affect the intensity and quality of the X-rays. Specifically, the high-voltage generator provides the heating current for the X-ray tube filament and the high voltage at both the cathode and anode. The maximum heating current, the filament heating current, determines the number of X-rays per unit time; the high voltage, the high voltage at both the cathode and anode, determines the penetrating power of the X-rays. The heat capacity of the anode target surface determines the instantaneous load capacity, measured in MHU. The larger the heat capacity of the X-ray tube, the stronger the X-ray output capability, thus limiting the maximum exposure time.

[0040] The electrocardiogram device 20 monitors the patient's electrocardiogram signal in real time, and the processor 600 dynamically adjusts the scanning parameters of the high-voltage system 100 based on the electrocardiogram signal to complete the scanning and imaging under real-time heart rate fluctuations.

[0041] Combination Figure 2 As shown, this disclosure provides a cardiac scanning method for a medical device, comprising:

[0042] S201, the processor obtains the first heart rate based on the real-time heart rate of the heart.

[0043] S202, the processor obtains the estimated remaining time for the cardiac scan if the first heart rate is lower than the second heart rate; wherein the second heart rate represents the reference heart rate before the scan.

[0044] S203, the processor obtains the estimated remaining heat capacity corresponding to the estimated remaining time.

[0045] S204, if the processor expects the remaining heat capacity to be greater than the actual remaining heat capacity, it adjusts the current scan parameters so that the heat capacity corresponding to the adjusted scan parameters within the expected remaining time is not greater than the actual remaining heat capacity.

[0046] The cardiac scanning method using the medical device provided in this disclosure dynamically adjusts CT scan parameters by real-time monitoring of the patient's electrocardiogram (ECG) signals, ensuring successful scanning and high-quality image generation even with changes in heart rate. First, a first heart rate is acquired during the scanning process based on the real-time heart rate. When the first heart rate is lower than the reference heart rate before scanning, the estimated remaining time for the cardiac scan is recalculated, and the estimated remaining thermal capacity is calculated based on the new heart rate and scan parameters. If the estimated remaining thermal capacity exceeds the actual remaining thermal capacity of the device, the scan parameters are adjusted to adapt to the new scanning conditions. Thus, this disclosure reduces the risk of scan failure due to thermal capacity limitations by adjusting the scan parameters, ensuring that the scan will not be interrupted due to insufficient thermal capacity even when heart rate changes extend the scan time. In other words, this application embodiment controls scan parameters based on the real-time heart rate during the scanning process, with completing the scan as the most basic control requirement, while also considering image quality. Generally, a higher tube current results in better image quality.

[0047] Optionally, obtaining a first heart rate based on the real-time heart rate includes: identifying multiple R peaks of the electrocardiogram signal; calculating multiple real-time heart rates based on the time between two adjacent R peaks; and selecting the lowest real-time heart rate among the multiple real-time heart rates as the first heart rate.

[0048] In this embodiment, an electrocardiogram (ECG) device is used to acquire the patient's ECG signals in real time. The R-peak of the ECG signal marks the beginning of ventricular depolarization, typically signifying the start of a heartbeat cycle. The ECG machine analyzes the ECG signals and automatically identifies the R-peak of each heartbeat cycle. By measuring the time between two adjacent R-peaks (interval time t), the duration of each heartbeat cycle can be calculated. The heart rate is the reciprocal of this time, i.e., HR = 60 / t. During the cardiac scan, the system continuously monitors and calculates the heart rate for each heartbeat cycle. Among the continuously monitored heart rates, the lowest heart rate is selected as the first heart rate. By monitoring the heart rate in real time and selecting the slowest heart rate, this embodiment can more accurately predict the thermal capacity required during the scan, thereby avoiding scan failure due to insufficient thermal capacity.

[0049] Optionally, the estimated remaining time for the cardiac scan is obtained, including: obtaining the phase range of the scanned phases; and obtaining the estimated remaining time based on the total scan phase range, the scanned phase range, and the first heart rate.

[0050] In this embodiment of the disclosure, if the heart rate changes during cardiac scanning, a longer exposure time may be required. If the actual remaining thermal capacity cannot meet the original scanning conditions, the scanning parameters need to be adjusted according to the estimated remaining time to ensure that the scan is completed normally and an image is constructed. By monitoring the heart rate in real time and adjusting the estimated remaining time according to the total scanning phase range and the already scanned phase range, it is possible to adapt to possible changes in the patient's heart rate during the scanning process and ensure real-time optimization of the scanning parameters.

[0051] Alternatively, the estimated remaining time can be obtained using the following formula:

[0052]

[0053] Where T represents the estimated remaining time, [PhaseBegin, PhaseEnd] represents the scan phase range, T2 represents the scanned time, T3 represents the time corresponding to the data required to reconstruct one phase image, HR1 represents the first heart rate, and HR2 represents the second heart rate. This represents the range of phases that have been scanned.

[0054] In this embodiment of the disclosure, a decrease in heart rate may lead to a longer exposure time, exceeding the maximum exposure time supported by the system. By recalculating the estimated remaining time, scanning parameters can be adjusted in a timely manner to avoid scan failure due to exceeding thermal capacity limits.

[0055] Alternatively, the estimated remaining heat capacity can be obtained using the following formula:

[0056] HU=kV×mA×T×1.41

[0057] Where HU is the estimated remaining heat capacity, kV is the tube voltage under the current scanning parameters, mA is the tube current under the current scanning parameters, and T is the estimated remaining time.

[0058] In this embodiment, changes in heart rate are detected. If the slowest heart rate during the placement process is lower than the slowest heart rate used before scanning to estimate the required thermal capacity for the scan, a new slowest heart rate can be used to estimate the required thermal capacity for the remaining scan portion. It is then confirmed whether the estimated thermal capacity for the remaining scan portion exceeds the system's remaining thermal capacity. If it does not exceed the system's remaining thermal capacity, scanning proceeds normally. If it exceeds the system's remaining thermal capacity, and the system cannot meet the needs of the current scanning conditions, the scanning parameters are automatically adjusted based on the remaining thermal capacity and the remaining required scanning time to ensure the scan is completed normally and the image is correctly constructed.

[0059] Optionally, the current scan parameters can be adjusted, including: obtaining the tube current parameters and / or tube voltage parameters to be adjusted based on the actual remaining heat capacity and the expected remaining time.

[0060] Combination Figure 3 As shown, this disclosure provides another method for cardiac scanning using a medical device, including:

[0061] The S301 processor obtains the first heart rate based on the real-time heart rate of the heart.

[0062] S302, the processor obtains the estimated remaining time for the cardiac scan when the first heart rate is lower than the second heart rate; wherein the second heart rate represents the reference heart rate before the scan.

[0063] S303, the processor obtains the estimated remaining heat capacity corresponding to the estimated remaining time.

[0064] S304, if the processor expects the remaining heat capacity to be greater than the actual remaining heat capacity, it obtains the required adjustment of the tube current parameters and / or tube voltage parameters based on the actual remaining heat capacity and the expected remaining time, so that the heat capacity corresponding to the adjusted scan parameters within the expected remaining time is not greater than the actual remaining heat capacity.

[0065] In this embodiment, by ensuring that the actual remaining heat capacity matches the required heat capacity, scan interruptions due to insufficient heat capacity are avoided. Furthermore, minimizing tube current while maintaining image quality also reduces the radiation dose to the patient. Prioritizing tube current reduction primarily affects image noise levels, which can be addressed through post-processing. Other parameters, such as tube voltage, can also be adjusted.

[0066] In practical applications, the correspondence between ECG signals and tube current during scanning is as follows: Figure 4 As shown.

[0067] A cardiac scan is performed at 120 kV and 500 mA. The slowest heart rate before the scan is 80. The time required to reconstruct one phase image is 0.5 seconds. The phase range of the scan is [0%, 400%]. Therefore, the estimated total time to complete the scan is 3.5 seconds. The calculation process is as follows:

[0068] 60 / 80 × (400% - 0%) + 0.5 = 3.5

[0069] Then, the preset heat capacity before the scan is calculated as follows:

[0070] 120×500×3.5×1.41=0.2961MHU

[0071] The calculated remaining heat capacity before scanning was 0.3 MHU, which was sufficient for scanning. However, after 1.75 seconds of scanning, a new slowest heart rate of 60 was detected. The remaining scanning time was calculated to be 2.25 seconds, as follows:

[0072] 60 / 60 × [(400%-0%)-(1.75-0.5 / 2)×80 / 60]+0.5 / 2=2.25

[0073] Therefore, if the scanning continues with the original parameters, the estimated remaining heat capacity is 0.19035 MHU, calculated as follows:

[0074] 120×500×2.25×1.41=0.19035MHU

[0075] The actual residual heat capacity is 0.152 MHU, and the calculation process is as follows:

[0076] 0.3 - 0.2961 / 2 = 0.152 MHU

[0077] The estimated remaining heat capacity exceeds the actual remaining heat capacity, requiring the tube current to be adjusted to 399.2645 mA. The calculation process is as follows:

[0078] 152000 / (120×2.25×1.41)=399.2645

[0079] In this way, scanning can continue by adjusting and reducing the tube current, preventing the scanning from being unexpectedly terminated due to insufficient heat capacity.

[0080] Optionally, the cardiac scanning method for a medical device further includes: maintaining the current scanning parameters to perform scanning imaging when the first heart rate is higher than or equal to the second heart rate.

[0081] Combination Figure 5 As shown, this disclosure provides a cardiac scanning method for a medical device, comprising:

[0082] The S501 processor obtains the first heart rate based on the real-time heart rate of the heart.

[0083] S502, the processor obtains the estimated remaining time for the cardiac scan when the first heart rate is lower than the second heart rate; wherein the second heart rate represents the reference heart rate before the scan.

[0084] S503, the processor obtains the estimated remaining heat capacity corresponding to the estimated remaining time.

[0085] S504: If the processor expects the remaining heat capacity to be greater than the actual remaining heat capacity, it adjusts the current scan parameters so that the heat capacity corresponding to the adjusted scan parameters is not greater than the actual remaining heat capacity within the expected remaining time.

[0086] In the S505, the processor maintains the current scan parameters to perform scan imaging when the first heart rate is higher than or equal to the second heart rate.

[0087] In this embodiment, by dynamically adjusting CT scan parameters through real-time monitoring of the patient's electrocardiogram (ECG), the risk of scan failure due to thermal capacity limitations is reduced. This ensures that even if heart rate changes lead to prolonged scan time, the scan will not be interrupted due to insufficient thermal capacity. Furthermore, the real-time monitored first heart rate is compared with a pre-set second heart rate. If the first heart rate is higher than or equal to the second heart rate, it indicates that the patient's heart rate has not significantly slowed down. In this case, the expected thermal capacity is sufficient to meet the scan requirements, and the system will maintain the current scan parameters and continue scanning and imaging, ensuring successful completion of the scan and generation of high-quality images. This embodiment can adapt to changes in the patient's heart rate during the scan process, whether the heart rate increases or decreases, ensuring smooth scan progress. This reduces scan failures and re-scans caused by heart rate changes.

[0088] Optionally, the reference heart rate includes one of the following: the slowest heart rate, the average heart rate, and the estimated heart rate based on a baseline heart rate, which is either the slowest or the average heart rate, as calculated before the scan.

[0089] For example, this disclosure embodiment monitors heart rate in real time using electrocardiogram (ECG) signals and selects the slowest heart rate. From continuously monitored data, the heart rate value corresponding to the longest RR interval (reverse retardation interval), i.e., the slowest heart rate, is selected as the reference heart rate. By selecting the slowest heart rate, the required thermal capacity during the scan can be more accurately estimated, thereby avoiding scan failures due to insufficient thermal capacity. Furthermore, this reference heart rate is crucial for optimizing cardiac CT scan parameters, helping to improve image quality, reduce motion artifacts, and lower radiation dose.

[0090] For example, in this embodiment of the disclosure, heart rate is monitored in real time using electrocardiogram (ECG) signals, and an estimated heart rate is obtained based on a baseline heart rate. If the baseline heart rate is the slowest heart rate, the estimated heart rate can be 5%-30% greater than the slowest heart rate. For example, if the slowest heart rate is 60 beats / min, the estimated heart rate can be 65 beats / min or 75 beats / min. If the baseline heart rate is the average heart rate, the estimated heart rate can be 5%-30% less than the average heart rate. For example, if the average heart rate is 70 beats / min, the estimated heart rate can be 65 beats / min or 55 beats / min.

[0091] Combination Figure 6As shown, this embodiment of the present disclosure provides a cardiac scanning device 60 for a medical device, including a processor 600 and a memory 601. Optionally, the device 60 may further include a communication interface 602 and a bus 603. The processor 600, communication interface 602, and memory 601 can communicate with each other via the bus 603. The communication interface 602 can be used for information transmission. The processor 600 can call logical instructions in the memory 601 to execute the cardiac scanning method of the medical device described in the above embodiment.

[0092] Furthermore, the logic instructions in the aforementioned memory 601 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0093] The memory 601, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 600 executes functional applications and data processing by running the program instructions / modules stored in the memory 601, thereby implementing the cardiac scanning method of the medical device described above.

[0094] The memory 601 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 601 may include high-speed random access memory and may also include non-volatile memory.

[0095] This disclosure provides a medical device, including a medical device body and a cardiac scanning device. The cardiac scanning device is mounted on the medical device body. The mounting relationship described herein is not limited to placement within the medical device body, but also includes mounting connections with other components of the medical device, including but not limited to physical connections, electrical connections, or signal transmission connections. Those skilled in the art will understand that the cardiac scanning device can be adapted to suitable medical device bodies to achieve other feasible embodiments.

[0096] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc., and other media capable of storing program code.

[0097] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0098] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0099] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0100] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A cardiac scanning method for medical devices, characterized in that, include: Obtain the first heart rate based on the heart's real-time heart rate; If the first heart rate is lower than the second heart rate, the estimated remaining time for the cardiac scan is obtained; where the second heart rate represents the reference heart rate before the scan. Obtain the estimated remaining heat capacity corresponding to the estimated remaining time; If the expected remaining heat capacity is greater than the actual remaining heat capacity, adjust the current scanning parameters so that the heat capacity corresponding to the adjusted scanning parameters is not greater than the actual remaining heat capacity within the expected remaining time.

2. The cardiac scanning method according to claim 1, characterized in that, Based on the real-time heart rate, obtain the first heart rate, including: Identify multiple R peaks in an electrocardiogram (ECG) signal; Multiple real-time heart rates are calculated based on the time between two adjacent R peaks; The lowest real-time heart rate among multiple real-time heart rates is selected as the first heart rate.

3. The cardiac scanning method according to claim 1, characterized in that, Obtain the estimated remaining time for the cardiac scan, including: Obtain the range of scanned phases; Based on the total scan phase range, the scanned phase range, and the first heart rate, the estimated remaining time is obtained.

4. The cardiac scanning method according to claim 3, characterized in that, The estimated remaining time can be obtained using the following formula: Where T is the estimated remaining time, [PhaseBegin, PhaseEnd] is the total scan phase range, T2 is the scanned time, T3 is the time corresponding to the data required to reconstruct one phase image, HR1 is the first heart rate, and HR2 is the second heart rate. This represents the range of phases that have been scanned.

5. The cardiac scanning method according to claim 1, characterized in that, Obtain the transistor voltage and transistor current under the current scan parameters; Based on the tube voltage and current under the current scanning parameters and the estimated remaining time, the estimated remaining heat capacity is obtained.

6. The cardiac scanning method according to any one of claims 1 to 5, characterized in that, Adjust the current scan parameters, including: Based on the actual remaining heat capacity and the expected remaining time, obtain the tube current parameters and / or tube voltage parameters that need to be adjusted.

7. The cardiac scanning method according to any one of claims 1 to 5, characterized in that, Also includes: If the first heart rate is higher than or equal to the second heart rate, maintain the current scan parameters to perform the scan imaging.

8. The cardiac scanning method according to any one of claims 1 to 5, characterized in that, Reference heart rate includes one of the following: the slowest heart rate, the average heart rate, or the estimated heart rate based on the baseline heart rate, which is either the slowest or the average heart rate, as recorded before the scan.

9. A cardiac scanning device for a medical device, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to perform the cardiac scanning method for a medical device as described in any one of claims 1 to 8 when executing the program instructions.

10. A medical device, characterized in that, include: Medical device body; The cardiac scanning device for a medical device as described in claim 9 is installed on the main body of the medical device.

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