Scanning method, reconstruction method, device, equipment and storage medium

Abstract

The invention relates to the technical field of medical imaging, and discloses a scanning method, a reconstruction method, a device, equipment and a storage medium. The scanning method is used for multiple bed-moving scans based on a gating signal, and for one bed-moving scan in the multiple bed-moving scans, when a scanning bed moves to a target position, scanning operation is executed on a target to-be-detected area immediately. And then, when the scanning duration for executing the scanning operation on the target to-be-detected area basically covers one motion cycle duration, stopping the scanning operation on the target to-be-detected area this time. In the implementation process, the next scanning operation can be started only after the scanning bed is adjusted to the target position without waiting for the starting signal of the next movement period of the patient, so that the total time of scanning is reduced.

Description

Technical Field

[0001] The present invention relates to the field of medical imaging technology, and particularly to a scanning method, a reconstruction method, a device, a device and a storage medium. Background Art

[0002] Respiratory motion is one of the uncertain factors in tumor radiotherapy. In order to reduce the influence of respiratory motion on tumor localization, respiratory gating technology is widely used. This technology monitors the respiratory amplitude signal of the patient in real time, and divides the respiratory cycle into different respiratory phases according to the change of the signal. Then, the CT scan data of the same respiratory phase are merged and reconstructed to improve the accuracy of tumor localization.

[0003] In the related art, the retrospective scanning method is to continuously monitor the respiratory signal, and the CT scan continuously acquires a large amount of data in a spiral mode. In order to achieve the reconstruction of all positions in the region of interest at any phase, the retrospective scanning method often needs to cover multiple respiratory cycles. However, the retrospective scanning method will prolong the scanning time and increase the radiation dose received by the patient. Summary of the Invention

[0004] The embodiments of the present specification aim to solve at least one of the technical problems in the related art to some extent. For this purpose, the embodiments of the present specification provide a scanning method, a reconstruction method, a device, a device and a storage medium.

[0005] The embodiments of the present specification provide a scanning method, which is used for multiple bed movement scans based on a gating signal. For one bed movement scan in the multiple bed movement scans, the method includes:

[0006] When the scanning bed moves to the target position, immediately perform a scanning operation on the target area to be measured;

[0007] When the scanning duration of performing the scanning operation on the target area to be measured basically covers the duration of one motion cycle, stop the current scanning operation on the target area to be measured.

[0008] In one embodiment, when the scanning duration of performing the scanning operation on the target area to be measured basically covers the duration of one motion cycle, stopping the current scanning operation on the target area to be measured includes:

[0009] Determine the scanning control position of the gating signal corresponding to the moment when the scanning operation on the target area to be measured starts in the motion cycle;

[0010] When the gating signal reaches the scanning control position in the next motion cycle, stop the current scanning operation on the target area to be measured.

[0011] In one embodiment, when the scanning duration for performing a scanning operation on the target area to be measured basically covers the duration of one motion cycle, stopping the current scanning operation on the target area to be measured includes:

[0012] When the scanning duration reaches a preset reference motion cycle duration, stopping the current scanning operation on the target area to be measured.

[0013] In one embodiment, before the bed movement scanning, the method further includes:

[0014] When first performing a scanning operation on the target area to be measured, based on the gating signal, determining the scanning start time and the scanning end time of the target area to be measured.

[0015] In one embodiment, the gating signal is a respiratory gating signal or a heartbeat gating signal.

[0016] An embodiment of the present specification provides a reconstruction method, which uses the scanning method described in any one of the above to obtain scanning reconstruction data of the target area to be measured. The execution duration of the scanning method corresponds to an execution gating signal. The method includes:

[0017] Based on the scanning reconstruction data and the execution gating signal, obtaining a target reconstruction image corresponding to the target phase.

[0018] In one embodiment, the obtaining a target reconstruction image corresponding to the target phase based on the scanning reconstruction data and the execution gating signal includes:

[0019] Determining the target phase based on the execution gating signal;

[0020] Based on the target phase and the scanning reconstruction data, obtaining a plurality of scanning reconstruction sub-data corresponding to the target phase, where each scanning reconstruction sub-data corresponds to a sub-scan, and the sub-scan is a bed movement scan or a scan before the bed movement;

[0021] Based on the plurality of scanning reconstruction sub-data, obtaining a target reconstruction image corresponding to the target phase.

[0022] In one embodiment, the execution gating signal includes a plurality of scanning cycles. Based on the target phase and the scanning reconstruction data, obtaining a plurality of scanning reconstruction sub-data corresponding to the target phase includes:

[0023] Determining a reference gating signal;

[0024] On any scanning cycle, based on the positional relationship between the reference gating signal and the target phase within the scanning cycle, determining the scanning reconstruction sub-data corresponding to the target phase within the scanning cycle;

[0025] Wherein, the scanning period refers to the gated signal segment corresponding to each scan of the target area to be measured.

[0026] In one embodiment, the execution gating signal includes a plurality of consecutive motion periods. Obtaining a plurality of scan reconstruction sub-data corresponding to the target phase based on the target phase and the scan reconstruction data includes:

[0027] Determine a plurality of reference gating signals, wherein the plurality of reference gating signals correspond one-to-one to the plurality of motion periods. The scan before bed movement corresponds to the first motion period, and each subsequent scan during bed movement corresponds to one motion period in sequence;

[0028] For any scan during bed movement, when the scan reconstruction sub-data of this scan during bed movement cannot be obtained according to the positional relationship between the reference gating signal corresponding to this scan during bed movement and the target phase, increase the positional relationship between the reference gating signal corresponding to this scan during bed movement and the target phase by one motion period to obtain the scan reconstruction sub-data of this scan during bed movement.

[0029] In one embodiment, there are a plurality of target phases, and the plurality of target phases are arranged at intervals in the motion period.

[0030] In one embodiment, the method further includes:

[0031] Among the target reconstruction images corresponding to the plurality of target phases, determine the target reconstruction image with the least motion artifact as the final target reconstruction image.

[0032] An embodiment of this specification provides a scanning device. The scanning device is used for multiple bed movement scans based on a gating signal. For one bed movement scan among the multiple bed movement scans, the device includes:

[0033] A scan operation execution module, configured to immediately perform a scan operation on the target area to be measured when the scan bed moves to the target position;

[0034] A scan operation stop module, configured to stop the current scan operation on the target area to be measured when the scan duration of the scan operation on the target area to be measured basically covers the duration of one motion period.

[0035] An embodiment of this specification provides a medical imaging device. The medical imaging device includes: a memory, and one or more processors communicatively connected to the memory; instructions executable by the one or more processors are stored in the memory, and when the instructions are executed by the one or more processors, the one or more processors are caused to implement the steps of the method described in any of the above embodiments.

[0036] Embodiments of this specification provide a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in any of the above embodiments are implemented.

[0037] Embodiments of this specification provide a computer program product, which includes instructions. When the instructions are executed by a processor of a computer device, the computer device can execute the steps of the method described in any of the above embodiments.

[0038] In the above embodiments of the specification, the scanning method is used for multiple bed movement scans based on a gating signal. For one bed movement scan among the multiple bed movement scans, when the scanning bed moves to the target position, a scanning operation is immediately performed on the target area to be measured. Then, when the scanning duration for performing the scanning operation on the target area to be measured basically covers the duration of one motion cycle, the scanning operation on the target area to be measured for this time is stopped. In the above implementation process, there is no need to wait for the start signal of the patient's next motion cycle. As long as the scanning bed is adjusted to the target position, the next scanning operation can be started, thereby reducing the total scanning time. Description of the Drawings

[0039] Figure 1a It is a schematic diagram of the retrospective scanning and wire laying method provided by the embodiments of this specification;

[0040] Figure 1b It is a schematic diagram of the prospective scanning provided by the embodiments of this specification;

[0041] Figure 2a It is a schematic flowchart of the scanning method provided by the embodiments of this specification;

[0042] Figure 2b It is a schematic diagram of the time required for the scanning bed to move provided by the embodiments of this specification;

[0043] Figure 2c It is a schematic diagram of obtaining scanning reconstruction data provided by the embodiments of this specification;

[0044] Figure 2d It is a schematic diagram of obtaining scanning reconstruction data of a new scanning coverage area provided by the embodiments of this specification;

[0045] Figure 3a It is a schematic flowchart of performing a scanning operation provided by the embodiments of this specification;

[0046] Figure 3b It is a schematic diagram of the scanning control position provided by the embodiments of this specification;

[0047] Figure 4Schematic diagram for determining the scanning start time and scanning end time of the target region to be measured provided by the embodiments of this specification;

[0048] Figure 5 Schematic diagram of the process for determining the target reconstructed image provided by the embodiments of this specification;

[0049] Figure 6a Schematic diagram of the process for determining the scanning and reconstruction sub - data corresponding to the target phase within the scanning period provided by the embodiments of this specification;

[0050] Figure 6b Schematic diagram of the scanning and reconstruction sub - data corresponding to the target phase within the scanning period provided by the embodiments of this specification;

[0051] Figure 7a Schematic diagram of the process for obtaining scanning and reconstruction sub - data based on the respiratory cycle provided by the embodiments of this specification;

[0052] Figure 7b Schematic diagram of the process for obtaining scanning and reconstruction sub - data based on the respiratory cycle provided by the embodiments of this specification;

[0053] Figure 8 Schematic diagram of the scanning device provided by the embodiments of this specification;

[0054] Figure 9 Internal structure diagram of the computer device provided by the embodiments of this specification. Specific embodiments

[0055] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation of the present invention.

[0056] Respiratory motion is one of the uncertainty factors in tumor radiotherapy. Respiratory motion not only causes displacement of the thoracic target tissue, but also affects abdominal organs such as the lungs, pancreas, and liver. This displacement makes it difficult to accurately locate the target area, and usually, it is necessary to expand the volume of the tumor target area to ensure complete coverage of the lesion. However, such expansion will increase the irradiation range of normal tissues, thereby increasing the risk of radiotherapy side effects.

[0057] To solve this problem, respiratory gating technology monitors the patient's respiratory signal through an external hardware device, divides the respiratory cycle based on the change in respiratory amplitude, and thus performs single - phase or multi - phase CT image reconstruction. This method can improve the accuracy of the boundaries of organs and lesions in CT images, and at the same time improve the accuracy of CT quantitative indicators, thereby enhancing the accuracy of diagnosis and efficacy evaluation.

[0058] In the related art, the retrospective respiratory gating technique is a commonly used method in multi-detector row spiral CT lung imaging. During this process, the patient's respiratory signal is continuously monitored, and the CT scan continuously acquires a large amount of data in a spiral manner. During the scan, not only the CT projection data is recorded, but also the respiratory signal is recorded synchronously. When reconstructing the image, the projection data that matches the respiratory signal is selected to obtain a more accurate image.

[0059] Exemplarily, please refer to Figure 1a , for the retrospective scan acquisition method, in order to achieve the reconstruction of all positions within the region of interest at any phase, the acquisition region spans multiple respiratory cycles. However, this will lead to an extended scan time, thereby increasing the patient's radiation dose.

[0060] In the related art, the prospective respiratory gating technique is widely used in CT scans of parts vulnerable to respiratory motion. During this process, by detecting the patient's respiratory signal, a certain phase or several phases in the respiratory cycle are selected for projection data acquisition.

[0061] Exemplarily, please refer to Figure 1b , for the prospective scan, the starting point and the ending point of the scan need to be set in advance. The scan will start when the patient's respiratory signal reaches the preset starting point and stop until the ending point. In order to fully cover the region of interest, the single acquisition region needs to span the entire respiratory cycle. If the scan length is not sufficient to cover the entire region, multiple scans are required. In this case, after each scan, the device will wait for the starting point of the next acquisition according to the respiratory signal and continue the scan. Since the normal respiratory rate of adults is once every 3 to 5 seconds, waiting for the starting point of each cycle will increase the overall scan positioning time, increasing the likelihood of the patient feeling discomfort or anxiety.

[0062] In addition to the above problems existing in CT scans based on the respiratory gating technique, CT scans based on the cardiac gating technique also have similar problems. Only compared with the normal respiratory rate of adults, which is once every 3 to 5 seconds, the heart rate is faster, and the resulting time waste is generally accepted or ignored, but the existence of the above problems cannot be ignored because of this.

[0063] Based on this, an embodiment of this specification provides a scanning method. The scanning method is used for multiple bed movement scans based on a gating signal. For one bed movement scan in the multiple bed movement scans, when the scanning bed moves to the target position, a scanning operation is immediately performed on the target area to be measured. Then, when the scanning duration of the scanning operation on the target area to be measured basically covers the duration of one motion cycle, the scanning operation on the target area to be measured this time is stopped. In the above implementation process, there is no need to wait for the start signal of the patient's next motion cycle. As long as the scanning bed is adjusted to the target position, the next scanning operation can be started, thereby reducing the total scanning time.

[0064] An embodiment of this specification provides a scanning method. Please refer to Figure 2a , the scanning method is used for multiple bed movement scans based on a gating signal. For one bed movement scan in the multiple bed movement scans, the scanning method may include the following steps:

[0065] S210. When the scanning bed moves to the target position, immediately perform a scanning operation on the target area to be measured.

[0066] S220. When the scanning duration of the scanning operation on the target area to be measured basically covers the duration of one motion cycle, stop the scanning operation on the target area to be measured this time.

[0067] Specifically, first, it is necessary to determine the next scanning position according to the position at the end of the previous scanning operation. The partial target area to be measured corresponding to the next scanning position should partially overlap with the partial target area to be measured corresponding to the current scanning position to ensure that a complete image of the area to be measured is stitched together. The position of the scanning bed corresponding to the next scanning position is the target position. Then, move the scanning bed. After the scanning bed moves to the target position, without waiting for the start moment of the next motion cycle, immediately start a new round of scanning. Perform a scanning operation at the target position to obtain the scanning reconstruction data of the partial target area to be measured. The scanning reconstruction areas of the partial target areas to be measured obtained by multiple bed movements can cover the target area to be measured. When the scanning duration of the scanning operation basically covers the duration of one motion cycle, stop the scanning operation on the target area to be measured this time. It should be noted that after each scanning is completed, it is necessary to confirm whether the scanning of the target area to be measured is completed, that is, whether the bed needs to be moved again. If it is not completed, the scanning method of this embodiment needs to be repeatedly executed. After multiple bed movement scans, a complete target area to be measured can be covered.

[0068] It should be noted that the scanning duration for performing a scanning operation on the target area to be measured can basically cover the duration of a motion cycle. This can be achieved through time control to basically cover the duration of a motion cycle, or through gating signal control to basically cover the duration of a motion cycle. Basically covering the duration of a motion cycle includes covering the duration of a motion cycle and slightly exceeding the duration of a motion cycle. Slightly exceeding the duration of a motion cycle can be understood as exceeding the duration of a motion cycle by within 10%.

[0069] The gating signal is a respiratory gating signal or a heartbeat gating signal. The respiratory gating signal can be collected by an elastic respiratory belt, a respiratory pad, or a radar wave sensor, and the heartbeat gating signal can be collected by an electrocardiograph or a finger pulse clip. When the gating signal is a respiratory gating signal, the motion cycle refers to the respiratory cycle, and when the gating signal is a heartbeat gating signal, the motion cycle refers to the heartbeat cycle.

[0070] In some embodiments, the scanning distance of the medical imaging device for the previous scanning operation is determined. This scanning distance refers to the area covered by the medical imaging device during the scanning process. According to this scanning distance and the scanning bed movement speed set by the current medical imaging device, the scanning bed movement time is calculated. Among them, the scanning bed movement speed can be a parameter set by the medical imaging device, usually set by medical staff before scanning. The determination of the movement speed is not only related to the imaging quality but also affected by the patient's comfort and operation specifications. After determining the scanning bed movement time, that is, the moving bed time, the movement of the scanning bed is started. The scanning bed moves at the scanning bed movement speed, and after the time for moving the scanning bed reaches the moving bed time, the scanning bed can move to the target position.

[0071] Exemplarily, taking the respiratory gating signal as an example.

[0072] Please refer to Figure 2b , the scanning bed needs to move, and the required time, that is, the moving bed time, is t couc h move .

[0073] Please refer to Figure 2c , when the scanning bed movement time reaches the moving bed time t couc h move later (corresponding to the moving bed area), the scanning bed is moved to the target position, and then the next scan is immediately started (corresponding to the start of wire release), and the scanning phase at this time is recorded as a% of the respiratory cycle. The scan is terminated until the scanning phase reaches (a + 100)% of the respiratory cycle (corresponding to the end of wire release), and the scan reconstruction data for the scanned coverage area (corresponding to the wire release area) is obtained. Here, a is the respiratory phase.

[0074] Please refer to Figure 2d, repeat steps S210 - S220, measure the time required for the scanning bed to move again. After reaching the target position, start the next scan to obtain the scan reconstruction data of the new scan coverage area (corresponding to the wire placement area).

[0075] In the above - mentioned embodiment, the scanning method is used for multiple bed - movement scans based on gating signals. For one bed - movement scan in multiple bed - movement scans, when the scanning bed moves to the target position, immediately perform a scanning operation on the target area to be measured. Then, when the scanning duration for performing the scanning operation on the target area to be measured basically covers the duration of one motion cycle, stop the current scanning operation on the target area to be measured. In the above - mentioned process, there is no need to wait for the start signal of the patient's next motion cycle. Just start the next scanning operation after the scanning bed is adjusted to the target position, thus reducing the total scanning time.

[0076] In some embodiments, refer to Figure 3a , when the scanning duration for performing the scanning operation on the target area to be measured basically covers the duration of one motion cycle, stopping the current scanning operation on the target area to be measured may include the following steps:

[0077] S310. Determine the scanning control position of the gating signal corresponding to the moment when starting to perform the scanning operation on the target area to be measured in the motion cycle.

[0078] S320. Stop the current scanning operation on the target area to be measured when the gating signal reaches the scanning control position in the next motion cycle.

[0079] Specifically, when performing the scanning operation on the target area to be measured, first, it is necessary to determine the position of the gating signal corresponding to the start moment of the scanning operation in the motion cycle and use this position as the scanning control position. Then, during the scanning operation, continuously monitor the change of the gating signal and compare the current gating signal with the scanning control position in real - time. When the gating signal reaches the scanning control position in the next motion cycle, stop the current scanning operation on the target area to be measured.

[0080] Exemplarily, taking the respiratory gating signal as an example.

[0081] Refer to Figure 3b , determine the scanning control position 302 of the respiratory gating signal corresponding to the moment when starting to perform the scanning operation on the target area to be measured in the respiratory cycle, and then stop the current scanning operation on the target area to be measured when the respiratory gating signal reaches the scanning control position 304 in the next respiratory cycle.

[0082] Next, determine the scanning control position 306 of the respiratory gating signal corresponding to the moment when starting to perform the scanning operation on the target area to be measured, and then stop the current scanning operation on the target area to be measured when the respiratory gating signal reaches the scanning control position 308 in the next respiratory cycle.

[0083] In the above embodiment, determining the scanning control position of the gating signal corresponding to the moment when starting to perform the scanning operation on the target area to be measured, and stopping the current scanning operation on the target area to be measured when the gating signal reaches the scanning control position in the next motion cycle, optimizes the scanning efficiency.

[0084] In some embodiments, when the scanning duration for performing the scanning operation on the target area to be measured basically covers the duration of one motion cycle, stopping the current scanning operation on the target area to be measured may include: stopping the current scanning operation on the target area to be measured when the scanning duration reaches the preset reference motion cycle duration.

[0085] Specifically, when performing the scanning operation, start timing. The scanning process will take this moment as the starting point of the scanning duration and record the position of the gating signal at this time. During the scanning process, the system will continuously monitor the elapsed time. When the scanning duration reaches the preset reference motion cycle duration, stop the current scanning operation on the target area to be measured and obtain the scanning reconstruction data corresponding to this scanning operation.

[0086] It should be noted that the reference motion cycle duration can be the average motion cycle duration, the longest motion cycle duration, or the average motion cycle duration or the longest motion cycle duration plus a redundancy amount. The redundancy amount can ensure that the reference motion cycle completely covers one motion cycle waveform. Completely covering one motion cycle waveform includes covering two consecutive motion cycles, the partial motion waveforms corresponding to each motion cycle, and the partial motion waveforms corresponding to the two motion cycles can be spliced to obtain one motion cycle waveform. Taking the respiratory gating signal as an example, the respiratory cycle refers to the time from the start of one inhalation to the start of the next inhalation, and the respiratory cycle waveform is roughly V-shaped.

[0087] In the above embodiment, stopping the current scanning operation on the target area to be measured when the scanning duration reaches the preset reference motion cycle duration optimizes the scanning efficiency.

[0088] In some embodiments, before the bed movement scanning, the method further includes: when first performing the scanning operation on the target area to be measured, determining the scanning start time and the scanning end time of the target area to be measured based on the gating signal.

[0089] Specifically, when performing a scanning operation on a target region to be measured for the first time, by monitoring and analyzing the user's gating signal in real time, a certain position is marked on the gating signal and used as the starting moment of scanning for the target region to be measured. Then, according to the actual situation and the starting moment of scanning for the target region to be measured, the ending moment of scanning for the target region to be measured is determined.

[0090] Exemplarily, taking the respiratory gating signal as an example, please refer to Figure 4 , according to the respiratory peak position of the respiratory gating signal, the respiratory peak position 402 is determined as the starting moment of scanning and the respiratory peak position 404 is determined as the ending moment of scanning.

[0091] In the above embodiment, when performing a scanning operation on a target region to be measured for the first time, based on the gating signal, the starting moment and the ending moment of scanning for the target region to be measured are determined, improving the quality of the scanned and reconstructed data.

[0092] Taking the respiratory gating signal as an example, if the respiratory rate remains stable and unchanged during scanning, the total scanning time t total is:

[0093]

[0094] where, t total represents the total scanning time, RESP represents the respiratory rate, n represents the number of scans, and t couchmove represents the moving bed time.

[0095] The embodiments of this specification provide a reconstruction method. By using the scanning method of any one of the above to obtain the scanned and reconstructed data of the target region to be measured, and the execution duration of the scanning method corresponds to an execution gating signal. This reconstruction method may include: based on the scanned and reconstructed data and the execution gating signal, obtaining a target reconstruction image corresponding to a target phase.

[0096] Specifically, by analyzing the execution gating signal to determine the target phase, and then according to the determined target phase, extracting part of the scanned and reconstructed data for image reconstruction from the scanned and reconstructed data. Finally, using a reconstruction algorithm to perform image reconstruction on the extracted part of the scanned and reconstructed data to obtain a target reconstruction image corresponding to the target phase.

[0097] In the above embodiment, based on the scanned and reconstructed data and the execution gating signal, obtaining a target reconstruction image corresponding to a target phase improves the image quality.

[0098] In some embodiments, please refer to Figure 5 , based on the scanned and reconstructed data and the execution gating signal, obtaining a target reconstruction image corresponding to a target phase may include the following steps:

[0099] S510. Determine the target phase based on the execution gating signal.

[0100] S520. Obtain multiple scan reconstruction sub - data corresponding to the target phase based on the target phase and the scan reconstruction data.

[0101] S530. Obtain the target reconstruction image corresponding to the target phase based on the multiple scan reconstruction sub - data.

[0102] Among them, each scan reconstruction sub - data corresponds to a sub - scan, and the sub - scan is a bed - shift scan or a scan before bed - shift.

[0103] Specifically, there is a corresponding relationship in time between the execution gating signal and the scan reconstruction data. Based on the position of the determined target phase on the execution gating signal and the corresponding relationship in time between the execution gating signal and the scan reconstruction data, multiple scan reconstruction sub - data corresponding to the target phase can be extracted from the scan reconstruction data. Each scan reconstruction sub - data corresponds to a sub - scan, and the sub - scan is a bed - shift scan or a scan before bed - shift (the first scan). Use the image reconstruction algorithm to perform image reconstruction processing on the multiple scan reconstruction sub - data respectively, and then combine the results of the image reconstruction to obtain the target reconstruction image corresponding to the target phase.

[0104] In the above - mentioned embodiment, the target phase is determined based on the execution gating signal, multiple scan reconstruction sub - data corresponding to the target phase are obtained based on the target phase and the scan reconstruction data, and the target reconstruction image corresponding to the target phase is obtained based on the multiple scan reconstruction sub - data, which optimizes the data acquisition and image reconstruction in the dynamic imaging process and improves the quality and accuracy of the target reconstruction image.

[0105] In some embodiments, please refer to Figure 6a , the execution gating signal includes multiple scan cycles. Obtaining multiple scan reconstruction sub - data corresponding to the target phase based on the target phase and the scan reconstruction data may include the following steps:

[0106] S610. Determine the reference gating signal.

[0107] S620. On any scan cycle, determine the scan reconstruction sub - data corresponding to the target phase within the scan cycle based on the positional relationship between the reference gating signal within the scan cycle and the target phase.

[0108] Among them, each scan cycle may include a reference gating signal. The scan cycle refers to the gating signal segment corresponding to each scan of the target area to be measured, that is, the gating signal segment corresponding to the sub - scan. The scan cycle may not be a motion cycle, but the gating signals within the scan cycle can be pieced together to form a motion cycle.

[0109] Specifically, each scan of the target area to be measured includes a pre-table movement scan and a scan after each table movement. According to the preset requirements, a reference gating signal is determined. For example, the reference respiratory gating signal can be the respiratory peak or the respiratory valley, and the reference cardiac gating signal can be the R peak of the electrocardiogram. In any scan cycle, the reference gating signal corresponding to this scan cycle is used as the starting benchmark. Then, starting from the reference gating signal, based on the positional relationship between the reference gating signal corresponding to the scan cycle and the target phase, the position of the target phase corresponding to the scan cycle is found, and the scan reconstruction sub-data corresponding to the scan cycle is determined according to the position of the target phase corresponding to the scan cycle.

[0110] Exemplarily, taking the case of 2 table movements and 3 scan operations controlled based on the respiratory gating signal as an example, please refer to Figure 6b , mark the first respiratory peak as the reference respiratory gating signal for the first scan cycle (corresponding to the area within the leftmost square). Based on the positional relationship between the target phase and the reference respiratory gating signal, in the scan reconstruction data, determine the first scan reconstruction sub-data corresponding to the target phase within the first scan cycle. Mark the second respiratory peak as the reference respiratory gating signal for the second scan cycle (corresponding to the area within the middle square). Based on the positional relationship between the target phase and the reference respiratory gating signal, in the scan reconstruction data, determine the second scan reconstruction sub-data corresponding to the target phase within the second scan cycle. Similarly, based on the third respiratory peak mark, determine the third scan reconstruction sub-data corresponding to the target phase within the third scan cycle (corresponding to the area within the rightmost square). The first, second, and third scan reconstruction sub-data cover the target area to be measured, and thus a complete image of the target area to be measured at the target phase position can be reconstructed based on the first, second, and third scan reconstruction sub-data.

[0111] In the above embodiments, the reference gating signal is determined. In any scan cycle, based on the positional relationship between the reference gating signal within the scan cycle and the target phase, the scan reconstruction sub-data corresponding to the target phase within the scan cycle is determined, providing a basis for subsequent determination of the target reconstruction image.

[0112] In some embodiments, please refer to Figure 7a , the execution gating signal includes multiple consecutive motion cycles. Based on the target phase and the scan reconstruction data, obtaining multiple scan reconstruction sub-data corresponding to the target phase may include the following steps:

[0113] S710. Determine multiple reference gating signals.

[0114] S720. For any bed movement scan, when the scan reconstruction sub-data of this bed movement scan cannot be obtained according to the positional relationship between the reference gating signal corresponding to this bed movement scan and the target phase, add one motion cycle to the positional relationship between the reference gating signal corresponding to this bed movement scan and the target phase, and obtain the scan reconstruction sub-data of this bed movement scan.

[0115] Among them, multiple reference gating signals correspond one-to-one with multiple motion cycles. The scan before bed movement can correspond to the first motion cycle, and each subsequent bed movement scan corresponds to one motion cycle in turn.

[0116] Specifically, for each bed movement scan, obtain the scan reconstruction sub-data of this bed movement scan according to the positional relationship between the reference gating signal corresponding to this bed movement scan and the target phase. However, for any bed movement scan, if the position determined according to the positional relationship between the reference gating signal corresponding to this bed movement scan and the target phase within its corresponding motion cycle corresponds to the time when the scan bed moves, the scan reconstruction sub-data of this bed movement scan cannot be obtained and cannot be used for subsequent data analysis. In this case, to ensure the integrity and validity of the data, the reference gating signal corresponding to this bed movement scan can continue to be used as the starting benchmark, and then add one motion cycle to the positional relationship between the reference gating signal corresponding to this bed movement scan and the target phase. It can be understood that the reference gating signal corresponding to the next bed movement scan after this bed movement scan is used as the starting benchmark, and then the scan reconstruction sub-data corresponding to this bed movement scan is obtained.

[0117] Exemplarily, taking 2 bed movement scans and 3 scan operations controlled based on the respiratory gating signal as an example, please refer to Figure 7b, the execution gating signal includes three complete respiratory cycles, and a reference respiratory gating signal is set for each respiratory cycle. The first reference respiratory gating signal (corresponding to the first respiratory peak marker) is set for the first respiratory cycle, the second reference respiratory gating signal (corresponding to the second respiratory peak marker) is set for the second respiratory cycle, and the third reference respiratory gating signal (corresponding to the third respiratory peak marker) is set for the third respiratory cycle. The acquisition of the scanned and reconstructed sub-data corresponding to the target phase of the scan before bed movement refers to the first respiratory peak marker. The acquisition of the scanned and reconstructed sub-data corresponding to the target phase of the scan after the first bed movement refers to the second respiratory peak marker. The acquisition of the scanned and reconstructed sub-data corresponding to the target phase of the scan after the second bed movement refers to the third respiratory peak marker. The scanned and reconstructed sub-data corresponding to the target phase of the scan before bed movement can be obtained based on the positional relationship between the first reference respiratory gating signal and the target phase. Since the starting moment of the scan after the first bed movement has exceeded the target phase position of the second motion cycle, and based on the second reference respiratory gating signal, the scanned and reconstructed sub-data corresponding to the target phase after the first bed movement cannot be found based on the positional relationship between the second reference respiratory gating signal and the target phase. In this way, the positional relationship between the second reference respiratory gating signal and the target phase can be increased by one respiratory cycle to obtain the scanned and reconstructed sub-data corresponding to the target phase after the first bed movement, which can be understood as obtaining the scanned and reconstructed sub-data corresponding to the target phase after the first bed movement based on the third reference respiratory gating signal. The acquisition of the scanned and reconstructed sub-data corresponding to the target phase after the second bed movement is based on the third reference respiratory gating signal, and the specific process can refer to the acquisition method of the scanned and reconstructed sub-data corresponding to the scan after the first bed movement.

[0118] Compared with the method of setting the reference gating signal within the scan cycle, setting the reference gating signal within the motion cycle will not cause the loss of scanned and reconstructed sub-data, because the scanned and reconstructed sub-data may not be obtained based on the set reference gating signal within the scan cycle. Taking Figure 6b as an example, when the target phase is set at position a, the scanned and reconstructed sub-data cannot be obtained within the second scan cycle.

[0119] In the above embodiments, multiple reference gating signals are determined. For any bed movement scan, when the scanned and reconstructed sub-data of this bed movement scan cannot be obtained according to the positional relationship between the reference gating signal corresponding to this bed movement scan and the target phase, the positional relationship between the reference gating signal corresponding to this bed movement scan and the target phase is increased by one motion cycle to obtain the scanned and reconstructed sub-data of this bed movement scan, ensuring the coherence and effectiveness of the data.

[0120] In some embodiments, there are multiple target phases, and the multiple target phases are arranged at intervals in the motion cycle.

[0121] Specifically, the motion cycle is segmented to obtain multiple phases, and the segmentation can be performed in an equally spaced manner. In the execution gating signal, each phase corresponds to a specific moment in each scan cycle. Since there are multiple phases, there will be a series of phases corresponding in each scan cycle, and the moment of each phase can be regarded as a target phase. Therefore, there are multiple target phases in each scan cycle.

[0122] Exemplarily, taking the respiratory gating signal as an example, the respiratory cycle is evenly divided into k equal parts. The first respiratory peak marker is used as the reference respiratory gating signal for the first respiratory cycle, that is, the starting benchmark, to determine the corresponding target phase. The second respiratory peak marker is used as the reference respiratory gating signal for the second respiratory cycle, that is, the starting benchmark, to determine the corresponding target phase.

[0123] In the above embodiments, there are multiple target phases, and the multiple target phases are arranged at intervals in the motion cycle to facilitate the subsequent determination of a final target reconstruction image with higher quality.

[0124] In some embodiments, the method may further include: among the target reconstruction images corresponding to the multiple target phases, determining the target reconstruction image with the least motion artifact as the final target reconstruction image.

[0125] Specifically, first, by analyzing the target reconstruction images corresponding to each target phase, the intensity of the motion artifact in each target reconstruction image is evaluated. Motion artifacts are mainly caused by irregular movements of the patient during the scanning process or physiological movements (such as breathing, heartbeat, etc.), resulting in image blurring or distortion. Motion artifacts usually exhibit different intensities and distributions in different target reconstruction images. Next, the degree of motion artifact of each target reconstruction image is evaluated one by one, and the target reconstruction image with the least motion artifact and the clearest is selected as the final target reconstruction image for accurate lesion localization.

[0126] In the above embodiments, among the target reconstruction images corresponding to the multiple target phases, determining the target reconstruction image with the least motion artifact as the final target reconstruction image improves the accuracy of lesion localization.

[0127] An embodiment of this specification provides a scanning device 800. Please refer to Figure 8 , the scanning device is used for multiple bed movement scans based on the gating signal. For one bed movement scan among the multiple bed movement scans, the scanning device 800 includes: a scanning operation execution module 810 and a scanning operation stop module 820.

[0128] A scanning operation execution module 810, configured to perform a scanning operation on a target area to be measured immediately when the scanning bed moves to a target position;

[0129] A scanning operation stop module 820, configured to stop the current scanning operation on the target area to be measured when the scanning duration of performing the scanning operation on the target area to be measured basically covers the duration of one motion cycle.

[0130] For the specific description of the scanning device, reference may be made to the description of the scanning method in the foregoing text, which will not be elaborated herein.

[0131] An embodiment of this specification provides a medical imaging device, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the method steps in the foregoing embodiment are implemented.

[0132] In some embodiments, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as Figure 9 shown. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected through a system bus. Among them, 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 and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner. The wireless manner may be implemented through WIFI, a carrier network, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, a scanning method and a reconstruction method are implemented. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device may be a touch layer covered on the display screen, or may be a button, a trackball, or a touchpad provided on the housing of the computer device, or may also be an external keyboard, a touchpad, or a mouse, etc.

[0133] Those skilled in the art can understand that Figure 9 the structure shown in

[0134] merely represents a block diagram of some structures related to the solution disclosed in this specification, and does not constitute a limitation on the computer device to which the solution disclosed in this specification is applied. Specifically, the computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0135] An embodiment of this specification provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method in any of the above embodiments are implemented.

[0136] An embodiment of this specification provides a computer program product, which includes instructions. When the instructions are executed by a processor of a computer device, the computer device can execute the steps of the method in any of the above embodiments.

[0137] It should be noted that the logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus or device (such as a computer-based system, a system including a processor, or other systems that can fetch instructions from the instruction execution system, apparatus or device and execute the instructions), or in combination with these instruction execution systems, apparatus or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by or in combination with an instruction execution system, apparatus or device. More specific examples (non-exhaustive list) of the computer-readable medium include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which a program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, then editing, interpreting or otherwise processing it as appropriate, and then storing it in a computer memory.

Claims

1. A scanning method, characterized in that: The scanning method is used for multiple bed movement scans based on a gating signal. For one bed movement scan among the multiple bed movement scans, the method includes: When the scanning bed moves to the target position, the scanning operation is immediately performed on the target area to be tested; When the scanning duration of the scanning operation on the target area to be detected substantially covers the duration of one motion cycle, the scanning operation on the target area to be detected is stopped.

2. The method according to claim 1, characterized in that When the scanning duration of the scanning operation on the target area to be detected substantially covers the duration of a motion cycle, stopping the scanning operation on the target area to be detected, comprises: Determine a scanning control position of a gate signal corresponding to the moment of starting to perform a scanning operation on the target area to be tested in the motion cycle; When the gate control signal reaches the scanning control position in the next motion cycle, the scanning operation on the target area to be tested is stopped.

3. The method according to claim 1, characterized in that When the scanning duration of the scanning operation on the target area to be detected substantially covers the duration of a motion cycle, stopping the scanning operation on the target area to be detected, comprises: When the scanning time reaches the preset reference motion cycle time, the scanning operation on the target area to be measured is stopped.

4. The method according to any one of claims 1 to 3, characterized in that: Before the bed moving scan, the method further includes: When a scanning operation is performed on the target area to be tested for the first time, a scanning start time and a scanning end time of the target area to be tested are determined based on the gating signal.

5. The method according to any one of claims 1 to 3, characterized in that: The gating signal is a respiratory gating signal or a heartbeat gating signal.

6. A reconstruction method, characterized in that: The scanning method according to any one of claims 1 to 5 is used to obtain scanning and reconstruction data of the target area to be measured, wherein the execution time of the scanning method corresponds to an execution gating signal, and the method comprises: Based on the scan reconstruction data and the execution gating signal, a target reconstructed image corresponding to a target period is acquired.

7. The method according to claim 6, characterized in that The step of acquiring a target reconstructed image corresponding to a target period based on the scan reconstruction data and the execution gating signal comprises: determining the target phase based on the execution gating signal; Based on the target phase and the scan reconstruction data, a plurality of scan reconstruction sub-data corresponding to the target phase are acquired, wherein each of the scan reconstruction sub-data corresponds to a sub-scan, and the sub-scan is a bed moving scan or a scan before bed moving; Based on the plurality of scan reconstruction sub-data, a target reconstructed image corresponding to the target phase is acquired.

8. The method according to claim 7, characterized in that The execution gate signal includes a plurality of scanning cycles, and based on the target period and the scanning reconstruction data, a plurality of scanning reconstruction sub-data corresponding to the target period are acquired, including: determining a reference gating signal; In any of the scanning cycles, based on the positional relationship between the reference gating signal and the target phase in the scanning cycle, determining the scanning reconstruction sub-data corresponding to the target phase in the scanning cycle; The scanning period refers to the gate signal segment corresponding to each scanning of the target area to be tested.

9. The method according to claim 7, characterized in that: The execution gate signal includes a plurality of continuous motion cycles, and the acquisition of a plurality of scanning and reconstruction sub-data corresponding to the target phase based on the target phase and the scanning and reconstruction data includes: Determine a plurality of reference gating signals, wherein the plurality of reference gating signals correspond one-to-one to the plurality of motion cycles, the scan before bed movement corresponds to the first motion cycle, and each subsequent bed movement scan corresponds to a motion cycle in sequence; For any bed moving scan, if the scan reconstruction sub-data of this bed moving scan cannot be obtained based on the positional relationship between the reference gating signal corresponding to this bed moving scan and the target phase, the positional relationship between the reference gating signal corresponding to this bed moving scan and the target phase is increased by one motion cycle to obtain the scan reconstruction sub-data of this bed moving scan.

10. The method according to any one of claims 6 to 9, characterized in that: There are a plurality of target phases, which are arranged at intervals in the movement cycle.

11. The method according to claim 10, characterized in that The method further comprises: Among the target reconstructed images corresponding to the multiple target phases, the target reconstructed image with the lightest motion artifact is determined as the final target reconstructed image.

12. A scanning device, characterized in that: The scanning device is used for multiple bed movement scans based on a gating signal. For one bed movement scan among the multiple bed movement scans, the device includes: A scanning operation execution module, used to immediately perform a scanning operation on the target area to be tested when the scanning bed moves to the target position; The scanning operation stopping module is used to stop the scanning operation on the target area to be detected when the scanning duration of the scanning operation on the target area to be detected substantially covers the duration of a motion cycle.

13. A medical imaging 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 steps of the method according to any one of claims 1 to 11 are implemented.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 11 are implemented.

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