Heart image reconstruction processing method, heart image time phase determination method and equipment

Abstract

The invention relates to the technical field of cardiac imaging, provides a cardiac image reconstruction processing method, a cardiac image time phase determination method and equipment, and can perform cardiac image reconstruction under the condition of no electrocardiogram waveform. The method comprises the steps of obtaining target scanning data of a target heart; the target scanning data is obtained by continuously exposing the target heart by the CT scanning equipment according to a set exposure time length; determining a plurality of reconstruction center moments in the exposure duration according to a preset mode; the preset mode enables the number of the plurality of reconstruction center moments to be lower than a threshold value and the heart form difference degree between the heart images of the adjacent reconstruction center moments to reach a difference degree threshold value; reconstructing the target scanning data according to the plurality of reconstruction center moments to obtain heart images at the plurality of reconstruction center moments; and determining the heart image at the target reconstruction center moment according to the heart images at the plurality of reconstruction center moments.

Description

Technical Field

[0001] The present application relates to the field of cardiac imaging technology, and in particular to a cardiac image reconstruction processing method and device, a cardiac image phase determination method and device, a computer device, a storage medium and a computer program product. Background Art

[0002] Cardiac imaging scanning techniques include post-gated scanning technology (retrospective ECG-gated scanning technology) and pre-gated scanning technology (prospective ECG-triggered scanning technology).

[0003] Post-gated scanning technology mainly utilizes the synchronous acquisition technology of electrocardiogram waveform (the full name of electrocardiogram is Electrocardiograph, abbreviated as ECG in English) and CT scanning. During the exposure of the heart, the electrocardiogram waveform of the heart is synchronously recorded. Afterwards, the scan data corresponding to the reconstruction time required by the doctor can be selected from all the scan data obtained by exposure based on the synchronously recorded electrocardiogram waveform to reconstruct the heart image of the reconstruction phase required by the doctor.

[0004] In the front-gated scanning technology, the doctor sets the delay time according to the required reconstruction phase; then, the electrocardiogram waveform of the heart is continuously monitored. When the arrival of the R wave is detected, the heart is exposed according to the set delay time to obtain the scanning data corresponding to the reconstruction time required by the doctor, so as to reconstruct the heart image of the reconstruction phase required by the doctor.

[0005] The above two scanning technologies are highly dependent on the ECG waveform in the processing process in order to reconstruct the cardiac image of the reconstruction phase required by the doctor. In the absence of the ECG waveform or the ECG waveform is inaccurate, it is difficult to obtain the cardiac image of the reconstruction phase required by the doctor. Summary of the invention

[0006] Based on this, it is necessary to provide a cardiac image reconstruction processing method and device, a cardiac image phase determination method and device, a computer device, a storage medium and a computer program product to address the above technical problems.

[0007] The present application provides a cardiac image reconstruction processing method, the method comprising:

[0008] Acquire target scanning data of a target heart; the target scanning data is obtained by continuously exposing the target heart to a CT scanning device according to a set exposure time;

[0009] According to a preset method, a plurality of reconstruction center moments are determined in the exposure time; the preset method makes the number of the plurality of reconstruction center moments lower than a threshold value and the difference of the heart morphology between the heart images at adjacent reconstruction center moments reaches a difference threshold value;

[0010] Reconstructing the target scan data according to the multiple reconstruction center moments to obtain heart images at multiple reconstruction center moments;

[0011] A target cardiac image at a reconstruction center time is determined according to the plurality of cardiac images at the reconstruction center time.

[0012] In one embodiment, determining a plurality of reconstruction center moments in the exposure duration according to a preset manner includes:

[0013] For any exposure duration ratio, sample scan data matching the exposure duration ratio is obtained, and whether the interval duration ratio is associated with the exposure duration ratio is determined according to whether the number of reconstruction center moments determined in the sample scan data according to the interval duration ratio is lower than the number threshold, and whether the heart morphology difference between heart images at adjacent reconstruction center moments reaches the difference threshold, so as to obtain the correlation relationship between different exposure duration ratios and interval duration ratios;

[0014] According to the association relationship and the target exposure duration ratio, the target interval duration ratio is obtained; the target exposure duration ratio is the ratio of the exposure duration in the cardiac cycle of the target heart;

[0015] According to the target interval duration ratio and the cardiac cycle of the target heart, a plurality of reconstruction center moments are determined in the exposure duration.

[0016] In one embodiment, determining a plurality of reconstruction center moments in the exposure duration according to the target interval duration ratio and the cardiac cycle of the target heart includes:

[0017] Obtaining a target interval duration according to the target interval duration ratio and the cardiac cycle of the target heart;

[0018] Determine a first reconstruction center moment according to a scanning data range required for reconstructing a cardiac image at a single moment;

[0019] The first reconstruction center moment is used as a sampling start position, and the exposure duration is sampled according to the target interval duration to obtain multiple reconstruction center moments.

[0020] In one embodiment, the exposure duration is determined by:

[0021] Acquiring the heart rate of the target heart;

[0022] The exposure duration is determined according to the heart rate and the set ratio.

[0023] In one embodiment, determining a cardiac image at a target reconstruction center time according to the plurality of cardiac images at the reconstruction center time includes:

[0024] Get the preset evaluation algorithm;

[0025] According to the preset evaluation algorithm, a cardiac image at a target reconstruction center time is determined from a plurality of cardiac images at reconstruction center time points.

[0026] In one embodiment, the method further comprises:

[0027] Determining whether the cardiac image at the target reconstruction center moment requires motion correction;

[0028] If motion correction is required, the heart image at the target reconstruction center time is subjected to motion correction.

[0029] The present application provides a cardiac image reconstruction processing device, the device comprising:

[0030] A scanning data acquisition module, used to acquire target scanning data of a target heart; the target scanning data is obtained by continuously exposing the target heart to a CT scanning device according to a set exposure time;

[0031] A reconstruction center moment determination module, configured to determine a plurality of reconstruction center moments in the exposure duration according to a preset method; the preset method enables the number of the plurality of reconstruction center moments to be lower than a threshold value and the difference in cardiac morphology between cardiac images at adjacent reconstruction center moments to reach a difference threshold value;

[0032] A reconstruction processing module, used to reconstruct the target scan data according to the multiple reconstruction center moments to obtain cardiac images at multiple reconstruction center moments;

[0033] The reconstruction processing module is further used to determine the heart image at the target reconstruction center moment according to the heart images at the multiple reconstruction center moments.

[0034] The present application provides a method for determining the phase of a cardiac image, the method comprising:

[0035] Acquire a plurality of cardiac images at reconstruction center moments; the plurality of cardiac images at reconstruction center moments are obtained according to any embodiment of the cardiac image reconstruction processing method described above;

[0036] Determining the cardiac chamber volumes at the multiple reconstructed center moments according to the cardiac images at the multiple reconstructed center moments;

[0037] According to the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform, and the cardiac chamber volumes at multiple reconstruction center moments, determining the position corresponding to each reconstruction center moment on the virtual electrocardiogram waveform;

[0038] According to the position, a reconstruction phase corresponding to the heart image at each reconstruction center moment is determined.

[0039] In one embodiment, according to the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform, and the cardiac chamber volumes at multiple reconstruction center moments, determining the position corresponding to each reconstruction center moment on the virtual electrocardiogram waveform includes:

[0040] Among the cardiac chamber volumes at multiple reconstruction center moments, determining the cardiac chamber volume at the first reconstruction center moment and the cardiac chamber volume at the last reconstruction center moment;

[0041] Determine the positions corresponding to the first reconstruction center moment and the last reconstruction center moment on the virtual electrocardiogram waveform according to the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform, the cardiac chamber volume at the first reconstruction center moment, and the cardiac chamber volume at the last reconstruction center moment;

[0042] Determine the position of the intermediate reconstruction center moment on the virtual electrocardiogram waveform according to the position of the first reconstruction center moment on the virtual electrocardiogram waveform and the interval between the intermediate reconstruction center moment and the first reconstruction center moment; or,

[0043] The position corresponding to the intermediate reconstruction center moment on the virtual electrocardiogram waveform is determined according to the position corresponding to the last reconstruction center moment on the virtual electrocardiogram waveform and the interval between the intermediate reconstruction center moment and the last reconstruction center moment.

[0044] In one embodiment, if the reconstruction phase includes an absolute reconstruction phase, the step of acquiring the virtual electrocardiogram waveform includes:

[0045] Obtain standard electrocardiogram waveform;

[0046] According to the cardiac cycle of the heart, the standard electrocardiogram waveform is compressed or stretched to obtain a virtual electrocardiogram waveform.

[0047] The present application provides a device for determining a phase of a cardiac image, the device comprising:

[0048] An image acquisition module, used to acquire a plurality of cardiac images at reconstruction center moments; the plurality of cardiac images at reconstruction center moments are obtained according to any embodiment of the above-mentioned cardiac image reconstruction processing method;

[0049] A volume determination module, used to determine the cardiac chamber volumes at multiple reconstruction center moments according to the cardiac images at multiple reconstruction center moments;

[0050] A position determination module, for determining the position corresponding to each reconstruction center moment on the virtual electrocardiogram waveform according to the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform and the cardiac chamber volumes at multiple reconstruction center moments;

[0051] The phase determination module is used to determine the reconstruction phase corresponding to the heart image at each reconstruction center moment according to the position.

[0052] The present application provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the above method.

[0053] The present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to execute the above method.

[0054] The present application provides a computer program product, on which a computer program is stored, and the computer program is executed by a processor to perform the above method.

[0055] In the solution provided in the present application, the CT scanning equipment can continuously expose the target heart according to the set exposure time without relying on the electrocardiogram waveform of the target heart to trigger the exposure, so as to obtain the target scanning data. After obtaining the target scanning data, multiple reconstruction center moments are determined in the exposure time according to a preset method. The preset method can make the number of multiple reconstruction center moments lower than a threshold and the difference in heart morphology between heart images at adjacent reconstruction center moments reach a difference threshold. When reconstructing the target scanning data according to the multiple reconstruction center moments selected in this preset method, the number of heart images required to be reconstructed is small, thereby ensuring the reconstruction processing efficiency, and the reconstructed heart images at the multiple reconstruction center moments can cover most of the reconstruction phases as much as possible, so that the heart image of the reconstruction phase required by the doctor can be hit with a high probability; and after obtaining the heart images at multiple reconstruction center moments, the heart image at the target reconstruction center moment can be determined to provide feedback to the doctor, thereby improving the doctor's processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0057] Figure 1 is a schematic flow chart of a cardiac image reconstruction processing method in one embodiment;

[0058] FIG2( a ) is a schematic flow chart of a method for determining a phase of a cardiac image in one embodiment;

[0059] FIG2( b ) is a schematic diagram showing the corresponding relationship between the ventricular volume change curve and the electrocardiogram waveform in one embodiment;

[0060] Figure 3 A schematic diagram of a process provided by the present application in one embodiment;

[0061] Figure 4 is a schematic diagram of a heart image at multiple reconstruction center moments in one embodiment;

[0062] Figure 5 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0064] The method provided in the present application can be used on CT scanning devices with different collimations, for example, it can be used on CT scanning devices with large collimation (greater than or equal to 16 cm) or on CT scanning devices with small collimation (less than 16 cm); the method provided in the present application can also be applied on single-source CT scanning devices or multi-source CT scanning devices.

[0065] The method provided in this application can be applied to coronary calcification scoring scan and coronary CTA scan (including cardiovascular combined scan), wherein the English abbreviation of coronary CTA scan is CCTA, and the full English name is Coronary Artery CTAngiography.

[0066] In a coronary calcification integral scanning scenario or a coronary CTA scanning scenario, after the subject is in place, with the help of the method provided in the present application, there is no need to collect the subject's electrocardiogram waveform. The doctor can trigger the CT scanning device to expose the subject's heart (which can be called the target heart) at any time point. The CT scanning device continuously exposes the target heart according to the set exposure time to obtain target scanning data of the target heart. The target scanning data can be reconstructed according to multiple reconstruction center moments to obtain heart images at multiple reconstruction center moments. These heart images can cover most of the reconstruction phases as much as possible.

[0067] In one embodiment, the present application provides a cardiac image reconstruction processing method comprising: Figure 1 The steps shown are:

[0068] Step S101, acquiring target scanning data of a target heart.

[0069] The target scanning data is obtained by continuously exposing the target heart to the CT scanning device according to the set exposure time.

[0070] Specifically, the embodiment of the present application does not need to use the electrocardiogram waveform of the target heart to determine the exposure start time. The CT scanning device can expose the target heart at any time point and continue the exposure for a set time, thereby obtaining the data sensed by the detector, and using the data sensed by the detector as the target scanning data of the target heart; the set time in the continuous exposure set time can be called the exposure time. During the exposure process of the CT scanning device, it can work in the axial scanning mode. In the axial scanning mode, the detector and the radiation source of the CT scanning device rotate as a whole.

[0071] In a scenario where the target heart is exposed, the exposure duration used may be obtained based on the heart rate of the target heart, or the exposure duration used may be obtained without considering the heart rate of the target heart.

[0072] When the exposure time used is obtained according to the heart rate of the target heart, the exposure time is adaptive to the heart rate of the target heart. At this time, determining the exposure time includes the following steps: obtaining the heart rate of the target heart; determining the exposure time according to the heart rate and the set ratio.

[0073] Specifically, the heart rate of the target heart before the exposure begins can be obtained, and the cardiac cycle of the target heart can be determined based on the heart rate. Then, the cardiac cycle is multiplied by the set ratio, and the product is used as the exposure time, or the product is adjusted to obtain the exposure time; wherein, the value of the set ratio can be set as needed, when the set ratio is greater than or equal to 1, the exposure time at least includes the time corresponding to one cardiac cycle, and when the set ratio is greater than or equal to 0.5 and less than 1, the exposure time at least includes the time corresponding to half a cardiac cycle.

[0074] For example, if the heart rate of the target heart is 60 beats / minute and the cardiac cycle of the target heart is 1000ms, if the set ratio is 1, then the product of the cardiac cycle and the set ratio is 1000ms. 1000ms can be directly used as the exposure time, or 1000ms can be adjusted and the adjusted result is used as the exposure time.

[0075] The method of obtaining the heart rate of the target heart before exposure begins may include but is not limited to the following methods:

[0076] Method 1: When the target object wears a wearable device, the heart rate of the target heart before the exposure starts can be obtained according to the wearable device, wherein the target object is an object having a target heart;

[0077] Method 2: When the CT scanning device has a heart rate detection function, the heart rate detection unit of the CT scanning device can be called to obtain the heart rate of the target heart before the exposure starts.

[0078] When the exposure time is obtained without considering the heart rate of the target heart, the exposure time may be determined in the following ways:

[0079] Method 1: A time value input by a user, such as 1000ms, may be obtained and used as the exposure duration. The time value input by the user may be determined by the user without considering the individual heart rate of the target heart, and the user may include a doctor.

[0080] Method 2: A fixed heart rate that is not highly correlated with the target heart can be obtained, and a fixed cardiac cycle can be obtained based on the fixed heart rate, and the fixed cardiac cycle can be multiplied by a set ratio to obtain the exposure time. The set ratio can be pre-set or input by the user.

[0081] Step S102: determining a plurality of reconstruction center moments in the exposure time according to a preset method.

[0082] The preset method can make the number of multiple reconstruction center moments lower than a threshold and the difference in heart morphology between heart images at adjacent reconstruction center moments reach a difference threshold.

[0083] According to the preset method, the target interval duration can be determined, and sampling is performed during the exposure duration according to the target interval duration to obtain N reconstruction center moments (N is an integer greater than 1). The number of reconstruction center moments will not be too large, and the difference in heart morphology between heart images of the target heart at adjacent reconstruction center moments can reach a difference threshold. Therefore, the reconstruction phases to which the heart images of the N reconstruction center moments belong are mostly different and can cover most of the reconstruction phases.

[0084] Step S103, reconstructing the target scan data according to the multiple reconstruction center moments to obtain the heart images at the multiple reconstruction center moments.

[0085] After determining N reconstruction center moments, the following steps can be performed for each reconstruction center moment:

[0086] According to the scan data range required for reconstructing a single-time cardiac image, a scan data segment centered on the reconstruction center time can be determined in the scan data. For example, if the reconstruction center time is 500 ms, the scan data range required for reconstructing a single-time cardiac image is the scan data with an axial scan angle from 0 to 360 degrees, and the rotation time corresponding to the scan data range is T, then a scan data segment of [500-T / 2,500+T / 2] can be determined in the scan data, and the scan data segment is centered on the reconstruction center time (i.e., 500 ms). After obtaining the scan data segment centered on the reconstruction center time, the scan data segment can be reconstructed to obtain the cardiac image at the reconstruction center time.

[0087] In this way, N cardiac images at the reconstruction center moments can be obtained.

[0088] Step S104, determining a target reconstruction center moment cardiac image based on a plurality of reconstruction center moment cardiac images.

[0089] After obtaining N cardiac images at the reconstruction center moment, these cardiac images can be retained in the background and not all fed back to the user. The cardiac images at the N reconstruction center moments can be automatically evaluated based on the quality of each cardiac image or the degree of motion corresponding to each cardiac image, and the best cardiac image at the reconstruction center moment can be determined. The best cardiac image at the reconstruction center moment is used as the target cardiac image at the reconstruction center moment, and the target cardiac image at the reconstruction center moment is subsequently fed back to the user for analysis.

[0090] The method of obtaining the degree of motion corresponding to each heart image may specifically include: obtaining the degree of motion corresponding to the heart image based on the difference in heart morphology between the heart image and the heart image at the previous reconstructed center moment, the greater the difference in heart morphology, the greater the degree of motion.

[0091] While feeding back the cardiac image at the target reconstruction center moment to the doctor, the reconstruction phase corresponding to the cardiac image can also be fed back to the doctor. The method for determining the reconstruction phase will be introduced in the subsequent embodiments.

[0092] In the above-mentioned cardiac image reconstruction processing method, the CT scanning equipment can continuously expose the target heart according to the set exposure time without relying on the electrocardiogram waveform of the target heart to trigger the exposure, so as to obtain the target scanning data. After obtaining the target scanning data, multiple reconstruction center moments are determined in the exposure time according to a preset method. The preset method can make the number of multiple reconstruction center moments lower than a threshold and the cardiac morphology difference between cardiac images at adjacent reconstruction center moments reach a difference threshold. When reconstructing the target scanning data according to the multiple reconstruction center moments selected in this preset method, the number of cardiac images required to be reconstructed is small, thereby ensuring the reconstruction processing efficiency, and the reconstructed cardiac images at the multiple reconstruction center moments can cover most of the reconstruction phases as much as possible, so that the cardiac image of the reconstruction phase required by the doctor can be hit with a high probability; and after obtaining the cardiac images at the multiple reconstruction center moments, the cardiac image at the target reconstruction center moment can be determined to provide feedback to the doctor, thereby improving the doctor's processing efficiency.

[0093] In one embodiment, determining a target cardiac image at a reconstruction center moment based on cardiac images at multiple reconstruction center moments includes: acquiring a preset evaluation algorithm; and determining the target cardiac image at a reconstruction center moment among the cardiac images at multiple reconstruction center moments based on the preset evaluation algorithm.

[0094] A corresponding evaluation algorithm can be constructed according to the corresponding evaluation dimension, thereby obtaining a preset evaluation algorithm. Exemplarily, the evaluation dimension includes the degree of motion corresponding to each cardiac image. According to the preset evaluation algorithm corresponding to the evaluation dimension, when determining the cardiac image at the target reconstruction center moment from the cardiac images at the multiple reconstruction center moments, the following steps can be specifically performed:

[0095] For non-first reconstruction center moment, the difference in heart morphology between the heart image at the reconstruction center moment and the heart image at the previous reconstruction center moment can be obtained. The greater the difference in heart morphology, the greater the degree of motion corresponding to the heart image at the reconstruction center moment. In this way, the degree of motion corresponding to the heart image at each reconstruction center moment except the first reconstruction center moment can be obtained, and the heart image with a motion degree lower than the threshold or the smallest motion degree is selected, and the heart image is used as the heart image at the target reconstruction center moment.

[0096] In one embodiment, the cardiac image reconstruction processing method provided in the present application further includes: determining whether the cardiac image at the target reconstruction center moment requires motion correction; if motion correction is required, performing motion correction on the cardiac image at the target reconstruction center moment.

[0097] After determining the cardiac image at the target reconstruction center moment, before feeding the cardiac image back to the user, it can be automatically determined whether the cardiac image needs motion correction. If motion correction is required, the motion correction algorithm can be used to perform motion correction on the cardiac image, and the cardiac image after motion correction at the target reconstruction center moment can be fed back to the user for analysis.

[0098] In one embodiment, according to a preset method, multiple reconstruction center moments are determined in the exposure duration, including: for any exposure duration ratio, sample scan data matching the exposure duration ratio is obtained, and whether the interval duration ratio is associated with the exposure duration ratio is determined according to whether the number of reconstruction center moments determined in the sample scan data according to the interval duration ratio is lower than a quantity threshold, and whether the heart morphology difference between heart images of adjacent reconstruction center moments reaches a difference threshold, so as to obtain a correlation between different exposure duration ratios and interval duration ratios; according to the correlation and the target exposure duration ratio, a target interval duration ratio is obtained; the target exposure duration ratio is the ratio of the exposure duration in the cardiac cycle of the target heart; according to the target interval duration ratio and the cardiac cycle of the target heart, multiple reconstruction center moments are determined in the exposure duration.

[0099] The proportion of exposure time in the cardiac cycle is called exposure time proportion.

[0100] For a certain exposure time ratio, for example 80%, there are multiple combinations of exposure time and cardiac cycle that satisfy the exposure time ratio of 80%; illustratively, combination ①, the exposure time is 800ms and the cardiac cycle is 1000ms; combination ②: the exposure time is 720ms and the cardiac cycle is 900ms.

[0101] If a sample scan data is obtained by continuously exposing a heart with an exposure time of 800ms, and the cardiac cycle of the heart is 1000ms, then the sample scan data matches the exposure time by 80%.

[0102] If a sample scan data is obtained by continuously exposing a heart with an exposure time of 720ms, and the cardiac cycle of the heart (the cardiac cycle can be called the sample cardiac cycle) is 900ms, then the sample scan data matches the exposure time by 80%.

[0103] The exposure duration used to obtain the sample scan data may be referred to as a sample exposure duration, and the cardiac cycle of the heart corresponding to the sample scan data may be referred to as a sample cardiac cycle.

[0104] After obtaining sample scan data that matches 80% of the exposure duration ratio, the sample exposure duration and sample cardiac cycle corresponding to the sample scan data can be obtained. Then, the interval duration ratio can be adjusted multiple times. After each adjustment of the interval duration ratio, the following steps are performed:

[0105] The interval duration is obtained according to the product of the interval duration ratio and the sample cardiac cycle, and the interval duration is called the sample interval duration; multiple reconstruction center moments are determined in the sample exposure duration according to the sample interval duration, and the heart images of the multiple reconstruction center moments are reconstructed in combination with the sample scanning data; it is determined whether the difference in heart morphology between the heart images of adjacent reconstruction center moments reaches a difference threshold and whether the number of determined reconstruction center moments is lower than a number threshold;

[0106] If the heart morphology difference does not reach the difference threshold, or the number of determined reconstruction center moments is not less than the number threshold, proceed to the next adjustment;

[0107] If the heart morphology difference reaches the difference threshold and the number of determined reconstruction center moments is lower than the number threshold, the next adjustment is stopped and the interval duration ratio is associated with 80% of the exposure duration ratio.

[0108] Among them, the difference in heart morphology between the heart images at the adjacent reconstruction center moments can be predicted by a neural network. Specifically, the heart images at the adjacent reconstruction center moments can be input into the neural network so that the neural network can predict the difference in heart morphology between the heart images at the adjacent reconstruction center moments.

[0109] According to the above method, the interval duration ratio associated with each exposure duration ratio can be determined, forming a correlation relationship between different exposure duration ratios and interval duration ratios.

[0110] According to the ratio of the exposure time used to obtain the target scanning data in the cardiac cycle of the target heart, the target exposure time ratio is obtained; according to the correlation relationship, the interval time ratio that matches the target exposure time ratio is determined, and the interval time ratio is used as the target interval time ratio; then, according to the target interval time ratio and the cardiac cycle of the target heart, multiple reconstruction center moments can be determined in the exposure time used to obtain the target scanning data.

[0111] The number of multiple reconstruction center moments determined in this way will not be too large, and the degree of difference in cardiac morphology between cardiac images at adjacent reconstruction center moments meets the requirements, indicating that the reconstruction phases to which the cardiac images at multiple reconstruction center moments belong are mostly different, thereby covering most of the reconstruction phases.

[0112] In one embodiment, multiple reconstruction center moments are determined in the exposure time according to the target interval time ratio and the cardiac cycle of the target heart, including: obtaining the target interval time according to the target interval time ratio and the cardiac cycle of the target heart; determining the first reconstruction center moment according to the scanning data range required to reconstruct the single-time heart image; taking the first reconstruction center moment as the sampling starting position, sampling the exposure time according to the target interval time, and obtaining multiple reconstruction center moments.

[0113] After obtaining the target interval duration ratio, the target interval duration ratio may be multiplied by the cardiac cycle of the target heart, and the product result may be used as the target interval duration.

[0114] Exemplarily, the scanning data range required to reconstruct a single-time cardiac image is the scanning data of the axial scanning angle of the CT scanning device from 0 to 360 degrees, and the rotation time corresponding to the scanning data range is T. Then, the first reconstruction center time t1 can be T / 2ms.

[0115] After determining the first reconstruction center time, take the first reconstruction center time as the sampling start position, sample the exposure time used to obtain the target scanning data according to the target interval time, and obtain multiple reconstruction center times. For example, the second reconstruction center time t2 = t1 + target interval time, and the third reconstruction center time t3 = t1 + 2 × target interval time.

[0116] In this embodiment, the first reconstruction center moment is determined according to the scan data range required to reconstruct the single-time cardiac image, which can avoid insufficient scan data for reconstruction at the first reconstruction center moment, and the obtained first reconstruction center moment is more reasonable.

[0117] The present application also provides a method for determining the phase of a cardiac image, which can determine the reconstruction phase corresponding to the cardiac image, and the determined reconstruction phase can be used in cardiac function analysis.

[0118] Reconstruction phase: A cardiac image is reconstructed in a certain phase in a single cardiac cycle, and this phase can be called a reconstruction phase. The reconstruction phase includes a relative reconstruction phase and an absolute reconstruction phase. A single cardiac cycle can be characterized by the interval time between two adjacent R waves (denoted as RR). For example, if reconstruction is performed at 80% of the RR interval time, the reconstruction phase at this time can be called a relative reconstruction phase; for another example, if reconstruction is performed 300ms after the R wave is delayed, the reconstruction phase at this time can be called an absolute reconstruction phase.

[0119] The method comprises the steps shown in FIG2(a):

[0120] Step S201, acquiring a plurality of cardiac images at reconstruction center moments.

[0121] Among them, the heart images at multiple reconstruction center moments can be obtained according to the above-mentioned heart image reconstruction processing method, and the specific introduction can refer to the above-mentioned embodiment.

[0122] Heart images at multiple reconstructed center moments can also be obtained by other means. For example, after obtaining the target scanning data of the target heart, the user can arbitrarily select multiple reconstruction center moments within the exposure time used to obtain the target scanning data, thereby obtaining heart images at multiple reconstruction center moments arbitrarily selected by the user.

[0123] Step S202: determining the cardiac chamber volumes at multiple reconstruction center moments according to multiple cardiac images at multiple reconstruction center moments.

[0124] For example, if N reconstruction center moments are determined, after obtaining the heart images at the N reconstruction center moments, the heart images at each reconstruction center moment can be analyzed to determine the cardiac chamber volume at each reconstruction center moment. The cardiac chamber volume can be the ventricular volume or the atrial volume of the heart.

[0125] Step S203, determining the position corresponding to each reconstruction center moment on the virtual electrocardiogram waveform according to the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform and the cardiac chamber volumes at multiple reconstruction center moments.

[0126] During the heart movement, the heart electrical signal changes with time, thereby forming an electrocardiogram waveform, and during the heart movement, the size of the heart chamber volume changes with time, thereby forming a heart chamber volume change curve. There is a corresponding relationship between the electrocardiogram waveform and the heart chamber volume change curve, refer to Figure 2 (b), Figure 2 (b) shows the corresponding relationship between the ventricular volume change curve and the electrocardiogram waveform.

[0127] The standard ventricular volume change curve, standard electrocardiogram waveform and the corresponding relationship between the two can be obtained from textbooks and other places.

[0128] When the reconstruction phase includes a relative reconstruction phase, the standard ventricular volume change curve can be directly used as the virtual ventricular volume change curve, the standard electrocardiogram waveform can be used as the virtual electrocardiogram waveform, and the correspondence between the standard ventricular volume change curve and the standard electrocardiogram waveform can be used as the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform.

[0129] When the reconstruction phase includes the absolute reconstruction phase, the step of obtaining the virtual electrocardiogram waveform includes: obtaining a standard electrocardiogram waveform; compressing or stretching the standard electrocardiogram waveform according to the cardiac cycle of the target heart to obtain the virtual electrocardiogram waveform.

[0130] Exemplarily, the cardiac cycle corresponding to the standard ECG waveform is 900ms, and the cardiac cycle of the target heart is 1000ms. At this time, the standard ECG waveform can be stretched so that the cardiac cycle corresponding to the standard ECG waveform becomes the cardiac cycle of the target heart, and the stretched standard ECG waveform is used as a virtual ECG waveform.

[0131] In another exemplary example, the cardiac cycle corresponding to the standard ECG waveform is 900ms, and the cardiac cycle of the target heart is 800ms. At this time, the standard ECG waveform can be compressed so that the cardiac cycle corresponding to the standard ECG waveform becomes the cardiac cycle of the target heart, and the compressed standard ECG waveform is used as a virtual ECG waveform.

[0132] In addition to compressing or stretching the standard electrocardiogram waveform, the standard ventricular volume change curve may also be compressed or stretched. Specifically, the standard ventricular volume change curve may be compressed according to the degree of compression of the standard electrocardiogram waveform, or the standard ventricular volume change curve may be stretched according to the degree of stretching of the standard electrocardiogram waveform. The standard ventricular volume change curve obtained after compression or stretching is used as the virtual ventricular volume change curve.

[0133] The standard ventricular volume change curve and the standard electrocardiogram waveform still have a corresponding relationship after being compressed or stretched, and thus the corresponding relationship between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform can be obtained.

[0134] In this embodiment, when determining the reconstruction phase corresponding to the heart image, there is no need to collect the real electrocardiogram waveform of the corresponding heart during the exposure process, and it can be achieved with the help of a virtual electrocardiogram waveform.

[0135] Step S204: determining the reconstruction phase corresponding to the heart image at each reconstruction center moment according to the position.

[0136] Specifically, the correspondence between the virtual electrocardiogram waveform and the virtual cardiac chamber volume change curve can be obtained in the aforementioned manner. According to the correspondence and the cardiac chamber volumes of N reconstructed center moments, the corresponding position of each reconstructed center moment on the virtual electrocardiogram waveform can be determined.

[0137] For each reconstruction center moment, based on the corresponding position of the reconstruction center moment on the virtual electrocardiogram waveform and the respective positions of the two adjacent R waves on the virtual electrocardiogram waveform, it is possible to determine the percentage of the RR interval time that the reconstruction center moment belongs to, thereby determining the relative reconstruction phase corresponding to the heart image at the reconstruction center moment.

[0138] For each reconstruction center moment, based on the corresponding position of the reconstruction center moment on the virtual electrocardiogram waveform and the position of the R wave on the virtual electrocardiogram waveform, the time delay of the reconstruction center moment relative to the R wave can be determined, thereby determining the absolute reconstruction phase corresponding to the heart image at the reconstruction center moment.

[0139] In this embodiment, in the absence of an electrocardiogram waveform of a target heart, the reconstruction phases corresponding to the heart images at multiple reconstruction center moments can be determined with the help of the heart chamber volumes, virtual heart chamber volume change curves, and virtual electrocardiogram waveforms reflected by the heart images at multiple reconstruction center moments, thereby reducing dependence on the electrocardiogram waveform.

[0140] In one embodiment, the position corresponding to each reconstruction center moment on the virtual electrocardiogram waveform is determined according to the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform, and the cardiac chamber volumes of multiple reconstruction center moments, including: determining the cardiac chamber volume of the first reconstruction center moment and the cardiac chamber volume of the last reconstruction center moment among the cardiac chamber volumes of multiple reconstruction center moments; determining the positions corresponding to the first reconstruction center moment and the last reconstruction center moment on the virtual electrocardiogram waveform according to the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform, the cardiac chamber volume of the first reconstruction center moment and the cardiac chamber volume of the last reconstruction center moment; determining the positions corresponding to the intermediate reconstruction center moments on the virtual electrocardiogram waveform according to the position corresponding to the first reconstruction center moment on the virtual electrocardiogram waveform and the interval between the intermediate reconstruction center moment and the first reconstruction center moment; or, determining the positions corresponding to the intermediate reconstruction center moments on the virtual electrocardiogram waveform according to the position corresponding to the last reconstruction center moment on the virtual electrocardiogram waveform and the interval between the intermediate reconstruction center moment and the last reconstruction center moment.

[0141] Taking N reconstruction center moments as an example, we can determine the first reconstruction center moment t 1 The cardiac chamber volume and the last reconstruction center time t N The cardiac chamber volume is calculated based on the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform, and the first reconstruction center time t 1 The cardiac chamber volume and the last reconstruction center time t N The volume of the cardiac chamber is used to determine the first reconstruction center time t 1 and the last reconstruction center time t N The corresponding position on the virtual ECG waveform.

[0142] For the first reconstruction center moment t 1 and the last reconstruction center time t N The reconstruction center moments between them can belong to the intermediate reconstruction center moments, with the second reconstruction center moment t 2 For example:

[0143] The first reconstruction center moment t 1 The corresponding position on the virtual ECG waveform and the second reconstruction center time t 2 and the first reconstruction center moment t 1 The interval length determines the second reconstruction center time t 2 The corresponding position on the virtual ECG waveform.

[0144] Alternatively, we can also use the last reconstruction center time t N The corresponding position on the virtual ECG waveform and the second reconstruction center time t 2and the last reconstruction center time t N The interval length determines the second reconstruction center time t 2 The corresponding position on the virtual ECG waveform.

[0145] In this embodiment, combined with the first reconstruction center time t 1 The cardiac chamber volume and the last reconstruction center time t N The cardiac chamber volume can more accurately determine the first reconstruction center time t 1 and the last reconstruction center time t N The corresponding position on the virtual electrocardiogram waveform is determined to avoid errors, thereby obtaining a more accurate corresponding position of the intermediate reconstruction center moment on the virtual electrocardiogram waveform.

[0146] In order to better understand the above method, an application example of the above method provided by the present application is described in detail below. This application example includes Figure 3 Steps shown.

[0147] Step S301, setting scanning parameters of the CT scanning device;

[0148] The scanning parameters may include an upper dose limit, a heart rate of the exposed heart, a set ratio, and an exposure time. The exposure range of a conventional cardiac CTA axial scanning protocol (i.e., the ratio of exposure time to cardiac cycle) is generally between 30% and 80%. The exposure range involved in this embodiment is longer. Therefore, in terms of dose, a low dose can be used for scanning, and analytical or deep learning noise reduction techniques can be used for reconstruction to achieve image effects equivalent to conventional doses.

[0149] CT scanning equipment can provide a dose modulation function, which allows the user to input a dose upper limit. After the positioning image is scanned, the CT scanning equipment automatically recommends scanning voltage and milliamperes as well as the corresponding noise reduction algorithm level based on the patient's positioning image, the dose upper limit entered by the user, the heart rate of the exposed heart, and the selected exposure time, thereby ensuring image quality while reducing the scanning dose.

[0150] Step S302, exposing the target heart according to the scanning parameters to obtain target scanning data;

[0151] Step S303, determining whether the user chooses to rebuild the central time;

[0152] If yes, proceed to step S304 and step S305, if no, proceed to step S306 to step S308;

[0153] Step S304, determining Y reconstruction center moments selected by the user and reconstructing heart images at the Y reconstruction center moments;

[0154] Step S305, taking a reconstruction center time selected by the user from the Y reconstruction center times as the target reconstruction center time;

[0155] Step S306, determining N reconstruction center moments during the exposure time;

[0156] Step S307, determining the best reconstruction center time among the N reconstruction center times;

[0157] Step S308, taking the best reconstruction center time as the target reconstruction center time;

[0158] Step S309, determining whether the heart image at the target reconstruction center moment requires motion correction;

[0159] If yes, proceed to step S310, if no, proceed to step S311;

[0160] Step S310, performing motion correction on the heart image at the target reconstruction center moment;

[0161] Step S311, outputting the heart image at the target reconstruction center moment for user analysis;

[0162] Step S312: output the reconstruction phase of the target reconstruction center time.

[0163] In the process of automatically identifying the reconstruction phase of the target reconstruction center moment, if the user selects a reconstruction center moment in step S304, and the reconstruction center moment is single at this time, then the reconstruction center moment can be used as the target reconstruction center moment. After obtaining the heart image of the target reconstruction center moment, the image analysis can be performed with the help of a neural network obtained by deep learning to determine the reconstruction phase of the target reconstruction center moment and output it to the user for analysis.

[0164] In the case where there are multiple reconstruction center moments, the reconstruction phase of the target reconstruction center moment may be determined with the aid of the above-mentioned cardiac image phase determination method.

[0165] Figure 4 This is a schematic diagram of the reconstruction results obtained by applying the method provided in this application to CCTA. When the number of multiple reconstruction center moments is 10, it can be obtained Figure 4 The heart images of the 10 reconstruction center moments are shown. Figure 4 It can be seen that the heart images at these 10 reconstruction center moments present different heart morphologies, showing the heart morphology from systole to diastole, and these heart images belong to different reconstruction phases, basically covering the entire cardiac cycle; further, according to the preset evaluation algorithm corresponding to the degree of motion corresponding to each heart image, it can be determined that the heart image at the 4th reconstruction center moment belongs to the heart image at the target reconstruction center moment.

[0166] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0167] Based on the same inventive concept, the embodiment of the present application also provides a cardiac image reconstruction processing device for implementing the cardiac image reconstruction processing method involved above. The implementation solution provided by the device to solve the problem is similar to the implementation solution recorded in the above method, so the specific limitations in the embodiments of one or more cardiac image reconstruction processing devices provided below can refer to the limitations of the cardiac image reconstruction processing method above, and will not be repeated here.

[0168] In one embodiment, a cardiac image reconstruction processing device is provided, comprising:

[0169] A scanning data acquisition module, used to acquire target scanning data of a target heart; the target scanning data is obtained by continuously exposing the target heart to a CT scanning device according to a set exposure time;

[0170] A reconstruction center moment determination module, configured to determine a plurality of reconstruction center moments in the exposure duration according to a preset method; the preset method enables the number of the plurality of reconstruction center moments to be lower than a threshold value and the difference in cardiac morphology between cardiac images at adjacent reconstruction center moments to reach a difference threshold value;

[0171] A reconstruction processing module, used to reconstruct the target scan data according to the multiple reconstruction center moments to obtain cardiac images at multiple reconstruction center moments;

[0172] The reconstruction processing module is further used to determine the heart image at the target reconstruction center moment according to the heart images at the multiple reconstruction center moments.

[0173] In one embodiment, the reconstruction center moment determination module is further used to: for any exposure duration ratio, obtain sample scan data matching the exposure duration ratio, and determine whether the interval duration ratio is associated with the exposure duration ratio according to whether the number of reconstruction center moments determined in the sample scan data according to the interval duration ratio is lower than a quantity threshold, and whether the heart morphology difference between heart images of adjacent reconstruction center moments reaches a difference threshold, so as to obtain a correlation relationship between different exposure duration ratios and interval duration ratios; obtain a target interval duration ratio according to the correlation relationship and the target exposure duration ratio; the target exposure duration ratio is the ratio of the exposure duration in the cardiac cycle of the target heart; and determine multiple reconstruction center moments in the exposure duration according to the target interval duration ratio and the cardiac cycle of the target heart.

[0174] In one embodiment, the reconstruction center time determination module is also used to: obtain the target interval duration according to the ratio of the target interval duration and the cardiac cycle of the target heart; determine the first reconstruction center time according to the scanning data range required to reconstruct the single-time heart image; use the first reconstruction center time as the sampling starting position, sample the exposure time according to the target interval duration, and obtain multiple reconstruction center times.

[0175] In one embodiment, the device further includes an exposure duration determination module, which is used to: obtain the heart rate of the target heart; and determine the exposure duration according to the heart rate and a set ratio.

[0176] In one embodiment, the reconstruction processing module is further used to: obtain a preset evaluation algorithm; and determine the cardiac image at the target reconstruction center moment from the cardiac images at multiple reconstruction center moments according to the preset evaluation algorithm.

[0177] In one embodiment, the device further comprises a motion correction module for determining whether the cardiac image at the target reconstruction center moment requires motion correction; if motion correction is required, performing motion correction on the cardiac image at the target reconstruction center moment.

[0178] Each module in the above cardiac image reconstruction processing device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0179] Based on the same inventive concept, the embodiment of the present application also provides a cardiac image phase determination device for implementing the cardiac image phase determination method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of one or more cardiac image phase determination devices provided below can refer to the limitations of the cardiac image phase determination method above, and will not be repeated here.

[0180] In one embodiment, a device for determining a phase of a cardiac image is provided, comprising:

[0181] An image acquisition module, used to acquire a plurality of cardiac images at reconstruction center moments; the plurality of cardiac images at reconstruction center moments are obtained according to any embodiment of the above-mentioned cardiac image reconstruction processing method;

[0182] A volume determination module, used to determine the cardiac chamber volumes at multiple reconstruction center moments according to the cardiac images at multiple reconstruction center moments;

[0183] A position determination module, for determining the position corresponding to each reconstruction center moment on the virtual electrocardiogram waveform according to the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform and the cardiac chamber volumes at multiple reconstruction center moments;

[0184] The phase determination module is used to determine the reconstruction phase corresponding to the heart image at each reconstruction center moment according to the position.

[0185] In one embodiment, the position determination module is also used to: determine the cardiac chamber volume of the first reconstruction center moment and the cardiac chamber volume of the last reconstruction center moment among the cardiac chamber volumes of multiple reconstruction center moments; determine the corresponding positions of the first reconstruction center moment and the last reconstruction center moment on the virtual electrocardiogram waveform according to the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform, the cardiac chamber volume of the first reconstruction center moment and the cardiac chamber volume of the last reconstruction center moment; determine the corresponding position of the intermediate reconstruction center moment on the virtual electrocardiogram waveform according to the corresponding position of the first reconstruction center moment on the virtual electrocardiogram waveform and the interval length between the intermediate reconstruction center moment and the first reconstruction center moment; or, determine the corresponding position of the intermediate reconstruction center moment on the virtual electrocardiogram waveform according to the corresponding position of the last reconstruction center moment on the virtual electrocardiogram waveform and the interval length between the intermediate reconstruction center moment and the last reconstruction center moment.

[0186] In one embodiment, if the reconstructed phase includes an absolute reconstructed phase, the device also includes a virtual electrocardiogram waveform acquisition module, which is used to: acquire a standard electrocardiogram waveform; compress or stretch the standard electrocardiogram waveform according to the cardiac cycle of the target heart to obtain a virtual electrocardiogram waveform.

[0187] Each module in the above-mentioned cardiac image phase determination device can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0188] In an exemplary embodiment, a computer device is provided, the internal structure of which can be shown as follows: Figure 5 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data involved in the above method. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for reconstructing a cardiac image or a method for determining the phase of a cardiac image is implemented.

[0189] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0190] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps in the above-mentioned various method embodiments when executing the computer program.

[0191] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0192] In one embodiment, a computer program product is provided, on which a computer program is stored, and the computer program is used by a processor to execute the steps in the above-mentioned various method embodiments.

[0193] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0194] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0195] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0196] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A cardiac image reconstruction method, characterized in that: The method comprises: Acquire target scanning data of a target heart; the target scanning data is obtained by continuously exposing the target heart to a CT scanning device according to a set exposure time; According to a preset method, a plurality of reconstruction center moments are determined in the exposure time; the preset method makes the number of the plurality of reconstruction center moments lower than a threshold value and the difference of the heart morphology between the heart images at adjacent reconstruction center moments reaches a difference threshold value; Reconstructing the target scan data according to the multiple reconstruction center moments to obtain heart images at multiple reconstruction center moments; A target cardiac image at a reconstruction center time is determined according to the plurality of cardiac images at the reconstruction center time.

2. The method according to claim 1, characterized in that Determining a plurality of reconstruction center moments in the exposure duration according to a preset manner includes: For any exposure duration ratio, sample scan data matching the exposure duration ratio is obtained, and whether the interval duration ratio is associated with the exposure duration ratio is determined according to whether the number of reconstruction center moments determined in the sample scan data according to the interval duration ratio is lower than the number threshold, and whether the heart morphology difference between heart images at adjacent reconstruction center moments reaches the difference threshold, so as to obtain the correlation relationship between different exposure duration ratios and interval duration ratios; According to the association relationship and the target exposure duration ratio, the target interval duration ratio is obtained; the target exposure duration ratio is the ratio of the exposure duration in the cardiac cycle of the target heart; According to the target interval duration ratio and the cardiac cycle of the target heart, a plurality of reconstruction center moments are determined in the exposure duration.

3. The method according to claim 2, characterized in that Determining a plurality of reconstruction center moments in the exposure duration according to the target interval duration ratio and the cardiac cycle of the target heart includes: Obtaining a target interval duration according to the target interval duration ratio and the cardiac cycle of the target heart; Determine a first reconstruction center moment according to a scanning data range required for reconstructing a cardiac image at a single moment; The first reconstruction center moment is used as a sampling start position, and the exposure duration is sampled according to the target interval duration to obtain multiple reconstruction center moments.

4. The method according to claim 1, characterized in that The method for determining the exposure duration includes: Acquiring the heart rate of the target heart; The exposure duration is determined according to the heart rate and the set ratio.

5. The method according to claim 1, characterized in that Determining a target cardiac image at a reconstruction center time according to the plurality of cardiac images at the reconstruction center time includes: Get the preset evaluation algorithm; According to the preset evaluation algorithm, a cardiac image at a target reconstruction center time is determined from a plurality of cardiac images at reconstruction center time points.

6. The method according to claim 1, characterized in that The method further comprises: Determining whether the cardiac image at the target reconstruction center moment requires motion correction; If motion correction is required, the heart image at the target reconstruction center time is subjected to motion correction.

7. A method for determining the phase of a cardiac image, characterized in that: The method further comprises: Acquire a plurality of cardiac images at reconstruction center moments; the plurality of cardiac images at reconstruction center moments are obtained by the method according to any one of claims 1 to 6; Determining the cardiac chamber volumes at the multiple reconstructed center moments according to the cardiac images at the multiple reconstructed center moments; According to the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform, and the cardiac chamber volumes at multiple reconstruction center moments, determining the position corresponding to each reconstruction center moment on the virtual electrocardiogram waveform; According to the position, the reconstruction phase corresponding to the heart image at each reconstruction center moment is determined.

8. The method according to claim 7, characterized in that According to the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform, and the cardiac chamber volumes at multiple reconstruction center moments, determining the position corresponding to each reconstruction center moment on the virtual electrocardiogram waveform, including: Among the cardiac chamber volumes at multiple reconstruction center moments, determining the cardiac chamber volume at the first reconstruction center moment and the cardiac chamber volume at the last reconstruction center moment; Determine the positions corresponding to the first reconstruction center moment and the last reconstruction center moment on the virtual electrocardiogram waveform according to the correspondence between the virtual cardiac chamber volume change curve and the virtual electrocardiogram waveform, the cardiac chamber volume at the first reconstruction center moment, and the cardiac chamber volume at the last reconstruction center moment; Determine the position of the intermediate reconstruction center moment on the virtual electrocardiogram waveform according to the position of the first reconstruction center moment on the virtual electrocardiogram waveform and the interval between the intermediate reconstruction center moment and the first reconstruction center moment; or, The position corresponding to the intermediate reconstruction center moment on the virtual electrocardiogram waveform is determined according to the position corresponding to the last reconstruction center moment on the virtual electrocardiogram waveform and the interval between the intermediate reconstruction center moment and the last reconstruction center moment.

9. The method according to claim 7, characterized in that: If the reconstruction phase includes an absolute reconstruction phase, the step of acquiring the virtual electrocardiogram waveform includes: Obtain standard electrocardiogram waveform; According to the cardiac cycle of the target heart, the standard electrocardiogram waveform is compressed or stretched to obtain a virtual electrocardiogram waveform.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 9 is implemented.

Images