Image acquisition method, device and computer equipment

Abstract

The application relates to an image acquisition method, device and computer equipment. The method comprises the following steps: acquiring a first scanning image and a second scanning image of a target position, the first scanning image being acquired after a first excitation pulse signal is applied to the target position, and the second scanning image being acquired after a second excitation pulse signal is applied to the target position; determining whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of a scanning region according to the first scanning image and the second scanning image; and scanning a part corresponding to the scanning region according to a determination result to acquire a scanning image of the part corresponding to the scanning region. The method can improve the image acquisition efficiency.

Description

Technical Field

[0001] This application relates to the field of medical technology, and in particular to an image acquisition method, apparatus, and computer equipment. Background Technology

[0002] With the development of medical technology, magnetic resonance imaging (MRI) technology has become increasingly mature. MRI equipment can acquire fluid attenuated inversion recovery (FLAIR) sequence images of the scanned object by scanning it.

[0003] In related technologies, during MRI scans, the subject often exhibits unintentional movements that affect the image quality of FLAIR images, leading to scan failures. In such cases, multiple scans are required to obtain higher-quality FLAIR images, resulting in low acquisition efficiency. Summary of the Invention

[0004] Therefore, it is necessary to provide an image acquisition method, apparatus, and computer equipment that can improve image acquisition efficiency in response to the above-mentioned technical problems.

[0005] Firstly, this application provides an image acquisition method, the method comprising:

[0006] Acquire a first scan image and a second scan image of the target location. The first scan image is acquired after a first excitation pulse signal is applied to the target location, and the second scan image is acquired after a second excitation pulse signal is applied to the target location.

[0007] Based on the first scan image and the second scan image, determine whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scan area;

[0008] Based on the judgment result, the corresponding part of the scanning area is scanned to acquire the scanned image of the corresponding part of the scanning area.

[0009] In one embodiment, determining whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanned area based on the first scanned image and the second scanned image includes:

[0010] Obtain the similarity between the first scanned image and the second scanned image;

[0011] Based on similarity, it is determined whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area.

[0012] In one embodiment, obtaining the similarity between the first scanned image and the second scanned image includes:

[0013] Obtain the first pixel feature information in the first scanned image, and obtain the second pixel feature information corresponding to the second scanned image;

[0014] The first pixel feature information is matched with the second pixel feature information to determine the number of pixels with the same feature information in the first pixel feature information and the second pixel feature information;

[0015] The ratio between the number of pixels with the same feature information and the total number of pixels is calculated, and this ratio is determined as the similarity between the first scanned image and the second scanned image.

[0016] In one embodiment, determining whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area based on similarity includes:

[0017] If the similarity is greater than a preset threshold, then the first excitation pulse signal and the second excitation pulse signal are determined to act on the same layer of the scanning area;

[0018] If the similarity is less than or equal to a preset threshold, it is determined that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area.

[0019] In one embodiment, scanning is performed on the area corresponding to the scanning region based on the determination result to acquire a scanned image of the area corresponding to the scanning region, including:

[0020] If the determination result is that the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area, then the corresponding part of the scanning area is scanned to acquire the scanning image of the corresponding part of the scanning area;

[0021] If the determination result is that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area, the target position is scanned again until the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area. Then, the corresponding part of the scanning area is scanned to acquire the scan image of the corresponding part of the scanning area.

[0022] In one embodiment, the first excitation pulse signal is applied during the signal recovery process after the inversion pulse is applied, and the pulse angle of the first excitation pulse signal is less than a preset angle threshold.

[0023] In one embodiment, the pulse angle of the first excitation pulse signal is smaller than the pulse angle of the second excitation pulse signal.

[0024] In one embodiment, the method further includes:

[0025] A damage gradient pulse signal is applied to the target location; the damage gradient signal is used to attenuate the transverse magnetization vector generated by the first excitation pulse; the damage gradient is applied between the first excitation pulse signal and the second excitation pulse signal.

[0026] Secondly, this application also provides an image acquisition device, which includes:

[0027] The acquisition module is used to acquire a first scan image and a second scan image of the target location. The first scan image is acquired after a first excitation pulse signal is applied to the target location, and the second scan image is acquired after a second excitation pulse signal is applied to the target location.

[0028] The determination module is used to determine, based on the first scan image and the second scan image, whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scan area;

[0029] The acquisition module is used to scan the corresponding part of the scanning area according to the judgment result, so as to acquire the scanned image of the corresponding part of the scanning area.

[0030] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the content of any of the image acquisition method embodiments in the first aspect described above.

[0031] Fourthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, implements the content of any of the image acquisition method embodiments in the first aspect described above.

[0032] Fifthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the content of any of the image acquisition method embodiments described in the first aspect.

[0033] The aforementioned image acquisition method, apparatus, and computer equipment acquire a first scan image and a second scan image of a target location. The first scan image is acquired after applying a first excitation pulse signal to the target location, and the second scan image is acquired after applying a second excitation pulse signal to the target location. Based on the first and second scan images, it is determined whether the first and second excitation pulse signals act on the same layer of the scanning area. Based on the determination result, the corresponding part of the scanning area is scanned to acquire a scan image of that part. This method performs two scans on the target location before performing a full scan of the corresponding part of the scanning area, and determines whether to continue scanning based on the scan images obtained from the two scans. This avoids the problem of unusable scan images obtained from scanning the entire corresponding part of the scanning area, reduces the scanning time for the corresponding part of the scanning area, and improves the efficiency of acquiring scan images of the corresponding part of the scanning area. Simultaneously, by applying pulse signals at different angles to the target location at different times, this method can acquire scan images of the target location at different times. By analyzing the two scan images at different times, it can accurately determine whether the two pulse signals act on the same layer of the scanning area. Therefore, based on the determination result, the corresponding part of the scanning area can be scanned more accurately, resulting in a more accurate scan image. Attached Figure Description

[0034] Figure 1 This is an application environment diagram of an image acquisition method in one embodiment;

[0035] Figure 2 This is a flowchart illustrating an image acquisition method in one embodiment;

[0036] Figure 3 This is a flowchart illustrating an image acquisition method in one embodiment;

[0037] Figure 4 This is a flowchart illustrating an image acquisition method in one embodiment;

[0038] Figure 5 This is a flowchart illustrating an image acquisition method in one embodiment;

[0039] Figure 6 This is a flowchart illustrating an image acquisition method in one embodiment;

[0040] Figure 7 This is a schematic diagram illustrating the application of an excitation pulse signal in one embodiment;

[0041] Figure 8 This is a flowchart illustrating an image acquisition method in one embodiment;

[0042] Figure 9This is a flowchart illustrating an image acquisition method in one embodiment;

[0043] Figure 10 This is a structural block diagram of an image acquisition device in one embodiment. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0045] The image acquisition method provided in this application embodiment can be applied to, for example... Figure 1 In the application environment shown, the computer device can be a server, comprising a processor, memory, and a network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs in the non-volatile storage media. The database stores data from the image acquisition process. The network interface communicates with external terminals via a network connection. When the computer program is executed by the processor, it implements the image acquisition method. This computer device can be implemented as a standalone computer or as a cluster of multiple computers.

[0046] In one embodiment, such as Figure 2 As shown, an image acquisition method is provided, which can be applied to... Figure 1 Taking a computer device as an example, the explanation includes the following steps:

[0047] S201, acquire a first scan image and a second scan image of the target location. The first scan image is acquired after a first excitation pulse signal is applied to the target location, and the second scan image is acquired after a second excitation pulse signal is applied to the target location.

[0048] Here, the target position refers to any location within the range of the excitation pulse signal application, which can be any position in spatial coordinates. Before applying the excitation pulse signal to the target position, the scanning area needs to be placed at that target position. This ensures that when the excitation pulse signal is applied to the target position, it is applied to the scanning area. When the part corresponding to the scanning area does not move, the first scan image and the second scan image corresponding to the target position are both images of the same layer within the scanning area; when the part corresponding to the scanning area moves, the first scan image and the second scan image are not images of the same layer within the scanning area.

[0049] The first excitation pulse signal is applied during the signal recovery process after the inversion pulse signal. That is, the first excitation pulse signal is a pulse signal between the inversion pulse signal and the excitation pulse signal, and its application time is closer to the inversion pulse signal. The pulse angle of the first excitation pulse signal is less than a preset angle threshold. For example, when the preset angle threshold is 30°, the first excitation pulse signal can be any angle less than 30°. The first scan image is acquired after the first excitation pulse signal is applied to the target position. The selection criterion for the pulse angle of the first excitation pulse signal is to ensure signal acquisition without affecting the water signal suppression effect at the target position. During the scanning process, the time for the water signal inversion recovery to zero-crossing at the target position needs to be calculated based on the actually selected angle. An additional setting is made to the water signal inversion recovery time at the target position during the scanning process to ensure the water pressure effect at the target position. No small-angle excitation pulses are added to other positions besides the target position, and the corresponding inversion recovery time remains unchanged. Furthermore, a damage gradient is added after the application of the first excitation pulse signal to attenuate its generated transverse magnetization vector, ensuring that it does not affect the effect of subsequent excitation pulse signals. For example, the angle of the inverting pulse signal can be 179°, 180° or 182°, and the angle of the excitation pulse signal can be 88°, 90° or 92°.

[0050] If the second scan image is a T1 liquid attenuation inversion recovery (T1-FLAIR), T1-FLAIR is acquired after the excitation pulse signal is applied; if the second scan image is a T2 liquid inversion recovery (T2-FLAIR), T2-FLAIR is acquired after the excitation pulse signal and the refocusing pulse are applied. In this embodiment, the computer device can send a pre-scan command to the MRI device, which carries the target location, the pulse angle of the first excitation pulse signal, and the pulse angle of the second excitation pulse signal. After receiving the pre-scan command, the MRI device applies the first excitation pulse signal to the target location and acquires an MRI image of the target location to obtain the first scan image; and after applying the second excitation pulse signal, acquires an MRI image of the target location to obtain the second scan image.

[0051] S202, based on the first scan image and the second scan image, determine whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scan area.

[0052] The scanning area is the region within the corresponding part that best reflects movement. When the scanning area corresponds to the head, the frontal lobe of the head may be better able to reflect head movement. Therefore, the scanning area corresponds to the frontal lobe of the head.

[0053] Optionally, the computer device can acquire first image information of the first scanned image and second image information of the second scanned image, and compare the first image information and the second image information to obtain the similarity between them. If the similarity between the first image information and the second image information is greater than a preset threshold, it is determined that the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanned area; if the similarity between the first image information and the second image information is less than or equal to the preset threshold, it is determined that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanned area. Optionally, the computer device can also train a neural network model using historical scanned images of all layers in the scanned area, input the first scanned image and the second scanned image into the trained neural network model, and output a judgment result through the neural network model. For example, when the output is 1, it is determined that the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanned area; when the output is 0, it is determined that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanned area. This embodiment does not limit the method of determining whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanned area based on the first scanned image and the second scanned image.

[0054] S203, based on the determination result, scan the part corresponding to the scanning area to acquire the scanned image of the part corresponding to the scanning area.

[0055] The scanned area can be any part of the body that may move, such as the head or lungs.

[0056] In this embodiment, if the determination result is that the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area, it indicates that the scanning area did not move during the time period between applying the first excitation pulse signal and applying the second excitation pulse signal. In other words, the part corresponding to the scanning area did not move. Therefore, scanning continues for all layers of the part corresponding to the scanning area to obtain a scanned image of that part. If the determination result is that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area, it indicates that the scanning area moved during the time period between applying the first excitation pulse signal and applying the second excitation pulse signal. In other words, the part corresponding to the scanning area moved. Therefore, the first excitation pulse signal and the second excitation pulse signal are reapplied to the target position, and the determination of whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area is repeated in the above manner until the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area. Then, scanning continues for all layers of the part corresponding to the scanning area to obtain a scanned image of that part. It should be noted that this method determines whether the scanning area has moved in the shortest possible time, thereby determining whether the part corresponding to the scanning area needs to be re-scanned.

[0057] In the aforementioned image acquisition method, a first scan image and a second scan image of the target location are acquired. The first scan image is acquired after applying a first excitation pulse signal to the target location, and the second scan image is acquired after applying a second excitation pulse signal to the target location. Based on the first and second scan images, it is determined whether the first and second excitation pulse signals act on the same layer of the scanning area. Based on the determination result, the corresponding part of the scanning area is scanned to acquire a scan image of that part. This method performs two scans on the target location before performing a full scan of the corresponding part of the scanning area, and determines whether to continue scanning based on the scan images obtained from the two scans. This avoids the problem of unusable scan images obtained from scanning the entire corresponding part of the scanning area, reduces the scanning time for that part, and improves the efficiency of acquiring scan images of that part. Simultaneously, by applying pulse signals at different angles to the target location at different times, this method can acquire scan images of the target location at different times. By analyzing the two scan images from different times, it can accurately determine whether the two pulse signals act on the same layer of the scanning area. Therefore, based on the determination result, the corresponding part of the scanning area can be scanned more accurately, resulting in a more accurate scan image.

[0058] Based on the above embodiments, this embodiment is... Figure 2The following section describes and explains step S202, "Based on the first scan image and the second scan image, determine whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scan area." Figure 3 As shown, step S202 above may include the following:

[0059] S301, Obtain the similarity between the first scanned image and the second scanned image.

[0060] In this embodiment, the computer device can extract first image feature information of the first scanned image and second image feature information of the second scanned image, compare the first image feature information with the second image feature information, and obtain the similarity between the first scanned image and the second scanned image based on the comparison result.

[0061] S302, based on similarity, determine whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area.

[0062] In this embodiment, the computer device can compare the similarity with a preset threshold. If the similarity is greater than the preset threshold, it is determined that the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area. If the similarity is less than or equal to the preset threshold, it is determined that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area.

[0063] In the image acquisition method described above, the similarity between the first scanned image and the second scanned image is obtained. Based on the similarity, it is determined whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanned area. This method can obtain an accurate similarity value by obtaining the similarity between the first scanned image and the second scanned image, and determine whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanned area based on the similarity value.

[0064] Based on the above embodiments, this embodiment is... Figure 3 The relevant content of step S301, "obtaining the similarity between the first scanned image and the second scanned image," will be described and explained. For example... Figure 4 As shown, step S301 above may include the following:

[0065] S401, obtain the first pixel feature information in the first scanned image, and obtain the second pixel feature information corresponding to the second scanned image.

[0066] In this embodiment, the computer device can use a feature extraction algorithm to extract features from the first scanned image and the second scanned image respectively, to obtain feature information corresponding to each pixel in the two scanned images, namely, the first pixel feature information in the first scanned image, and to obtain the second pixel feature information corresponding to the second scanned image. The feature extraction algorithm can be Principal Component Analysis (PCA), One-Hot Encoding, Local Binary Patterns (LBP), Clustering, etc.

[0067] S402, match the first pixel feature information with the second pixel feature information to determine the number of pixels with the same feature information in the first pixel feature information and the second pixel feature information.

[0068] In this embodiment, the computer device can match the feature information of any pixel in the first pixel feature information with the corresponding feature information in the second pixel feature information to determine whether the feature information of the two pixels is the same. According to this method, the feature information of each pixel in the first pixel feature information is matched with the corresponding feature information to obtain the number of pixels with the same feature information.

[0069] S403, calculate the ratio between the number of pixels with the same feature information and the total number of pixels, and determine the ratio as the similarity between the first scanned image and the second scanned image.

[0070] In this embodiment, the computer device can calculate the ratio between the number of pixels with identical feature information and the total number of pixels. This ratio represents the similarity between the first and second scanned images. This similarity can be measured using methods such as the Dice coefficient (DC) and the intraclass correlation coefficient (ICC). The DC coefficient is commonly used to reflect the similarity and overlap between two sets, such as the similarity of brain region segmentation, brain activation patterns, brain function, or brain structural abnormalities. The DC coefficient ranges from 0 to 1; the closer the DC coefficient is to 1, the higher the similarity or overlap between the two sets. Taking the frontal lobe as an example, when measuring the similarity between two scanned images of a target location, the DC coefficient represents the proportion of pixels with the same location and identical pixel feature information among all pixels. This DC coefficient can be expressed as:

[0071]

[0072] Among them, V AThis represents the first scan image of the target location acquired after the first excitation pulse signal was applied; V B This represents the second scan image of the target location acquired after the second excitation pulse signal was applied, 2*(V A ∩V B V represents the number of pixels in the first and second scan images that are in the same position and have identical pixel feature information, or whose error is within 5%. A +V B This represents the total number of pixels in the first scanned image and the second scanned image.

[0073] In the image acquisition method described above, first pixel feature information is obtained from a first scanned image, and second pixel feature information is obtained from a corresponding second scanned image. The first pixel feature information and the second pixel feature information are matched to determine the number of pixels with identical feature information in the first and second pixel feature information. The ratio between the number of pixels with identical feature information and the total number of pixels is calculated, and this ratio is used to determine the similarity between the first and second scanned images. This method, by extracting the first pixel feature information from the first scanned image and the corresponding second pixel feature information from the second scanned image, and matching the first and second pixel feature information, can accurately obtain the number of pixels with identical feature information. Based on this number of pixels with identical feature information, the similarity between the first and second scanned images can be accurately determined.

[0074] Based on the above embodiments, this embodiment is... Figure 3 The following section describes and explains step S302, "Based on similarity, determine whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area." Figure 5 As shown, step S302 above may include the following:

[0075] S501, if the similarity is greater than a preset threshold, then the first excitation pulse signal and the second excitation pulse signal are determined to act on the same layer of the scanning area.

[0076] In this embodiment, if the similarity is greater than a preset threshold, it means that there are many identical features between the first pixel feature information in the first scanned image and the second pixel feature information in the second scanned image. In other words, the first scanned image and the second scanned image are more likely to be scanned images of the same layer. Therefore, it can be determined that the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanned area.

[0077] S502, if the similarity is less than or equal to a preset threshold, then it is determined that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area.

[0078] In this embodiment, if the similarity is less than or equal to a preset threshold, it means that the number of features that are the same between the first pixel feature information in the first scanned image and the second pixel feature information in the second scanned image is small. That is, the more unlikely it is that the first scanned image and the second scanned image are to be scanned images of the same layer, the more likely it is that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanned area.

[0079] In the image acquisition method described above, if the similarity is greater than a preset threshold, it is determined that the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area; if the similarity is less than or equal to the preset threshold, it is determined that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area. This method accurately determines whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area by comparing the similarity with a preset threshold and based on the comparison result.

[0080] Based on the above embodiments, this embodiment is... Figure 2 The following section describes and explains step S203, "Scanning the corresponding area based on the judgment result to acquire a scanned image of the corresponding area." Figure 6 As shown, step S203 above may include the following:

[0081] S601, if the determination result is that the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area, then the part corresponding to the scanning area is scanned to acquire the scan image of the part corresponding to the scanning area.

[0082] In this embodiment, if it is determined that the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area, it means that the part corresponding to the scanning area did not move during the acquisition of the first scan image and the second scan image. Therefore, the part corresponding to the scanning area can be directly scanned to obtain a scan image of the part corresponding to the scanning area without motion artifacts.

[0083] S602, if the determination result is that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area, then the target position is scanned again until the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area, then the part corresponding to the scanning area is scanned to acquire the scan image of the part corresponding to the scanning area.

[0084] In this embodiment, if the computer device determines that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area, it indicates that the scanning area has moved during the time period when the first and second excitation pulse signals were applied. Therefore, the target position needs to be rescanned. Based on the rescanning result, it is determined whether the first and second excitation pulse signals act on the same layer of the scanning area during the rescanning process. If they act on the same layer, an image of the corresponding part of the scanning area is acquired; otherwise, the above method is used to rescan until the first and second excitation pulse signals act on the same layer of the scanning area. This process determines whether a rescanning is needed in a shorter time, which is faster and more efficient than rescanning after the entire scan is completed.

[0085] In the image acquisition method described above, if the determination result indicates that the first and second excitation pulse signals do not act on the same layer of the scanning area, the target position is re-scanned until the first and second excitation pulse signals act on the same layer of the scanning area. Then, the corresponding part of the scanning area is scanned to acquire a scanned image of that part. This method can promptly re-scan even when the two pulse signals do not act on the same layer, determining whether a rescan is necessary in a short time. This avoids the process of re-scanning after completion, reducing scanning time and improving scanning efficiency.

[0086] Furthermore, this embodiment describes the application process of the excitation pulse in detail. When the part corresponding to the scanning area moves, the position of each layer in the scanning area changes with the movement of the part corresponding to the scanning area. First and second excitation pulse signals at different times are applied to the target position. Thus, based on the image features in the acquired first and second scan images, it can be determined whether they are images of the same layer of the scanning area. If they are the same layer, it means that the part corresponding to the scanning area did not move during the application of the first and second excitation pulse signals; if they are not the same layer, it means that each layer of the scanning area moved during the application of the first and second excitation pulse signals, that is, the part corresponding to the scanning area moved. For example, when the coordinates of the target position are (20, 30), any point in the scanning area corresponding to the part of the scanning area is moved to the target position, and the first excitation pulse signal is applied to the target position. The first scan image is determined to be the third layer of the scanning area. Then, the second excitation pulse signal is applied to the target position, and the second scan image is determined to be the fourth layer of the scanning area. This indicates that the scanning area has moved, and the part corresponding to the scanning area has also moved. At this time, the target position needs to be scanned again.

[0087] In one embodiment, for Figure 2 The specific contents of the first excitation pulse signal and the second excitation pulse signal in the embodiment are described below. The first excitation pulse signal is applied during the signal recovery process after the inversion pulse is applied. The pulse angle of the first excitation pulse signal is less than a preset angle threshold. The pulse angle of the first excitation pulse signal is less than the pulse angle of the second excitation pulse signal.

[0088] Next Figure 7 The first and second excitation pulse signals described above will be explained in detail. Figure 7 This is a flowchart illustrating an image acquisition method in one embodiment. Taking the head as the part corresponding to the scanning area and the frontal lobe as an example, the head images include T1-FLAIR and T2-FLAIR. The image acquisition process of T1-FLAIR and T2-FLAIR is described in detail.

[0089] Before applying the first and second excitation pulse signals, any position in the frontal lobe of the head needs to be moved to the target position. For T1-FLAIR, after the inversion pulse signal, a first excitation pulse signal with a small angle is applied, and a first scan image of the target position is acquired after the small-angle excitation pulse signal is applied. Then, the second excitation pulse signal is applied, and a second scan image is acquired after the excitation pulse signal is applied. Based on the similarity between the pixel feature information of the first scan image and the pixel feature information of the second scan image, it is determined whether the two scan images are images of the same layer of the frontal lobe. Based on the determination result, it is determined whether the process needs to be re-scanned.

[0090] For T2-FLAIR, after applying a reversal pulse signal to the head, a first excitation pulse signal with a small angle is applied to the target position. After applying the first excitation pulse signal with a small angle, a first scan image of the target position is acquired. Then, after applying a second excitation pulse signal and a convergence pulse, a second scan image of the target position is acquired. The similarity between the pixel feature information of the first scan image and the pixel feature information of the second scan image is calculated. Based on the calculation result, it is determined whether the two scan images are images of the same layer of the frontal lobe. Based on the determination result, it is determined whether the process needs to be re-scanned.

[0091] It should be noted that the pulse angle of the first excitation pulse signal is smaller than that of the second excitation pulse signal. This is because applying a first excitation pulse signal with a smaller pulse angle will not affect the water pressure effect of magnetic resonance imaging. The smaller the pulse angle, the weaker the excitation signal, and the less or even no its impact on the image of the subsequent second excitation pulse. Simultaneously, the signal recovery corresponding to a small-angle excitation pulse is faster, reducing the time required to determine whether head movement has occurred. It should also be noted that if the pulse angle of the first excitation pulse is too small, a scan image of the target location cannot be acquired. Therefore, the pulse angle of the first excitation pulse is within a certain range to ensure the quality of the scan image without affecting the image of the subsequent second excitation pulse. For example, the pulse angle of the first excitation pulse can be between 10 and 30 degrees; within this range, the smaller the pulse angle of the first excitation pulse, the better.

[0092] In one embodiment, to prevent the transverse magnetization vector generated by the first excitation pulse signal from affecting the application of the second excitation pulse signal, a damage gradient pulse signal is also applied to the target position after the first excitation pulse signal. The specific process of applying the damage gradient pulse signal includes: applying the damage gradient pulse signal to the scanning area; the damage gradient pulse signal is used to attenuate the transverse magnetization vector generated by the first excitation pulse signal; the damage gradient is applied between the first excitation pulse signal and the second excitation pulse signal.

[0093] In this embodiment, a damage gradient pulse signal is applied to the target location after the first excitation pulse signal. This prevents the transverse magnetization vector generated by the first excitation pulse signal from affecting the applied second excitation pulse signal, thereby avoiding the influence of the transverse magnetization vector on the second scan image. This method scans only the target location during the scanning process, requiring a shorter scanning time. Based on the scan image of one target location, it determines whether to continue scanning, avoiding the need to make a decision after all scans are completed. This reduces scanning time and improves the efficiency of acquiring scan images of the corresponding parts of the scanned area.

[0094] In one embodiment, the image acquisition method is described in detail below, such as... Figure 8 As shown, the method may include:

[0095] S701, acquire the first and second scan images of the target location;

[0096] S702, obtain the first pixel feature information in the first scanned image, and obtain the second pixel feature information corresponding to the second scanned image;

[0097] S703, Match the first pixel feature information with the second pixel feature information to determine the number of pixels with the same feature information in the first pixel feature information and the second pixel feature information;

[0098] S704, calculate the ratio between the number of pixels with the same feature information and the total number of pixels, and determine the ratio as the similarity between the first scanned image and the second scanned image;

[0099] S705, if the similarity is less than or equal to a preset threshold, then it is determined that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area;

[0100] S706, the target position is scanned again until the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area, and then the part corresponding to the scanning area is scanned to acquire the scan image of the part corresponding to the scanning area.

[0101] Figure 9 This is a flowchart illustrating an image acquisition method in one embodiment. Figure 9Taking the brain as an example, and the frontal lobe as an example, the image acquisition method includes the following steps: S801: Move any position in the frontal lobe to the target position and apply a reverse pulse signal to the target position; S802: After the reverse pulse, apply a small-angle excitation pulse to the target position and acquire a scan image of the target position; S803: Acquire a scan image of the target position after the reverse pulse; S804: Calculate the similarity between the two scan images; S805: Determine whether the similarity is less than a first preset threshold; S806: If the similarity is less than or equal to the first preset threshold, Automatic rescanning is performed, and the rescanning process is displayed on the interface; S807: Determine if the similarity is greater than a first preset threshold and less than a second preset threshold; S808: If the similarity is greater than the first preset threshold and less than the second preset threshold, output whether a rescan is needed on the interface; S809: The doctor confirms whether a rescan is needed on the interface; S810: After the doctor confirms that a rescan is needed, a rescan is performed; S811: If the doctor does not confirm a rescan within a preset time period, or if the similarity is greater than the second preset threshold, the brain is directly scanned to obtain a brain scan image. The second preset threshold is greater than the first preset threshold. For example, the first preset threshold can be 0.4, and the second preset threshold can be 0.6. This method performs two scans on the target location before scanning the entire area corresponding to the scanning region. Based on the images obtained from the two scans, it determines whether to continue scanning. This avoids the problem of unusable scan images obtained from scanning the entire area, reducing scanning time and improving the efficiency of acquiring head scan images. Simultaneously, by applying pulse signals at different angles to the target location at different times, this method can acquire scan images of the target location at different times. Analyzing the two scan images from different times allows for accurate determination of whether the two pulse signals act on the same layer of the scanning region. Based on this determination, the head can be scanned more accurately, resulting in more precise scan images.

[0102] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0103] Based on the same inventive concept, this application also provides an image acquisition device for implementing the image acquisition method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more image acquisition device embodiments provided below can be found in the limitations of the image acquisition method described above, and will not be repeated here.

[0104] In one embodiment, such as Figure 10 As shown, an image acquisition device is provided, including: an acquisition module 11, a determination module 12, and an acquisition module 13, wherein:

[0105] The acquisition module 11 is used to acquire a first scan image and a second scan image of the target position. The first scan image is acquired after a first excitation pulse signal is applied to the target position, and the second scan image is acquired after a second excitation pulse signal is applied to the target position.

[0106] The first excitation pulse signal is applied during the signal recovery process after the inversion pulse is applied, and the pulse angle of the first excitation pulse signal is less than a preset angle threshold; the pulse angle of the first excitation pulse signal is less than the pulse angle of the second excitation pulse signal.

[0107] The determination module 12 is used to determine, based on the first scan image and the second scan image, whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scan area;

[0108] The acquisition module 13 is used to scan the part corresponding to the scanning area according to the judgment result, so as to acquire the scan image of the part corresponding to the scanning area.

[0109] In one embodiment, the determination module 12 includes: an acquisition unit and a determination unit, wherein:

[0110] An acquisition unit is used to acquire the similarity between the first scanned image and the second scanned image;

[0111] The determination unit is used to determine, based on similarity, whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area.

[0112] In one embodiment, the acquisition unit is further configured to acquire first pixel feature information in the first scanned image, and acquire second pixel feature information corresponding to the second scanned image; match the first pixel feature information with the second pixel feature information to determine the number of pixels with the same feature information in the first pixel feature information and the second pixel feature information; calculate the ratio between the number of pixels with the same feature information and the total number of pixels, and determine the ratio as the similarity between the first scanned image and the second scanned image.

[0113] In one embodiment, the determination unit is further configured to determine that the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area if the similarity is greater than a preset threshold; and to determine that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area if the similarity is less than or equal to the preset threshold.

[0114] In one embodiment, the acquisition module includes: a first scanning unit and a second scanning unit, wherein:

[0115] The first scanning unit is used to scan the part corresponding to the scanning area when the determination result is that the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area, so as to acquire the scan image of the part corresponding to the scanning area.

[0116] The second scanning unit is used to rescan the target position when the determination result is that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area, until the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area, and then scan the part corresponding to the scanning area to acquire the scan image of the part corresponding to the scanning area.

[0117] In one embodiment, the image acquisition device further includes an application module, wherein:

[0118] An application module is used to apply a damage gradient pulse signal to the target location; the damage gradient pulse signal is used to attenuate the transverse magnetization vector generated by the first excitation pulse signal; the damage gradient is applied between the first excitation pulse signal and the second excitation pulse signal.

[0119] Each module in the aforementioned image acquisition device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0120] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the content of any of the embodiments of the above-described image acquisition methods.

[0121] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the content of any one of the above-described embodiments of the image acquisition method.

[0122] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the content of any one of the embodiments of the above-described image acquisition method.

[0123] 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, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0124] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile 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. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0125] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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 specification.

[0126] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An image acquisition method, characterized in that, The method includes: A first scan image and a second scan image of the target location are acquired. The first scan image is acquired after a first excitation pulse signal is applied to the target location, and the second scan image is acquired after a second excitation pulse signal is applied to the target location. The pulse angles of the first excitation pulse signal and the second excitation pulse signal are different. Based on the first scan image and the second scan image, it is determined whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scan area; the scan area is set at the target position, and the scan area is the region inside the part corresponding to the scan area that reflects the motion; Based on the determination result, the part corresponding to the scanning area is scanned to acquire the scanned image of the part corresponding to the scanning area; The step of scanning the area corresponding to the scanning region based on the determination result to acquire a scanned image of the area corresponding to the scanning region includes: If the determination result is that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area, then the target position is scanned again until the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area. Then, the part corresponding to the scanning area is scanned to acquire the scan image of the part corresponding to the scanning area.

2. The method according to claim 1, characterized in that, The step of determining whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanned area based on the first scanned image and the second scanned image includes: Obtain the similarity between the first scanned image and the second scanned image; Based on the similarity, it is determined whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area.

3. The method according to claim 2, characterized in that, The step of obtaining the similarity between the first scanned image and the second scanned image includes: Obtain the first pixel feature information in the first scanned image, and obtain the second pixel feature information corresponding to the second scanned image; The first pixel feature information is matched with the second pixel feature information to determine the number of pixels with the same feature information in the first pixel feature information and the second pixel feature information; Calculate the ratio between the number of pixels with the same feature information and the total number of pixels, and determine the ratio as the similarity between the first scanned image and the second scanned image.

4. The method according to claim 2 or 3, characterized in that, The step of determining whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area based on the similarity includes: If the similarity is greater than a preset threshold, then the first excitation pulse signal and the second excitation pulse signal are determined to act on the same layer of the scanning area; If the similarity is less than or equal to the preset threshold, it is determined that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area.

5. The method according to any one of claims 1-3, characterized in that, The step of scanning the area corresponding to the scanning region based on the determination result to acquire a scanned image of the area corresponding to the scanning region further includes: If the determination result is that the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area, then the part corresponding to the scanning area is scanned to acquire a scan image of the part corresponding to the scanning area.

6. The method according to any one of claims 1-3, characterized in that, The first excitation pulse signal is applied during the signal recovery process after the inversion pulse is applied, and the pulse angle of the first excitation pulse signal is less than a preset angle threshold.

7. The method according to any one of claims 1-3, characterized in that, The pulse angle of the first excitation pulse signal is smaller than the pulse angle of the second excitation pulse signal.

8. The method according to any one of claims 1-3, characterized in that, The method further includes: A damage gradient pulse signal is applied to the target location; the damage gradient pulse signal is used to attenuate the transverse magnetization vector generated by the first excitation pulse signal; the damage gradient is applied between the first excitation pulse signal and the second excitation pulse signal.

9. An image acquisition device, characterized in that, The device includes: The acquisition module is used to acquire a first scan image and a second scan image of the target location. The first scan image is acquired after a first excitation pulse signal is applied to the target location, and the second scan image is acquired after a second excitation pulse signal is applied to the target location. The pulse angles of the first excitation pulse signal and the second excitation pulse signal are different. The determination module is used to determine, based on the first scan image and the second scan image, whether the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scan area; the scan area is set at the target position, and the scan area is the region inside the part corresponding to the scan area that reflects the motion; The acquisition module is used to scan the part corresponding to the scanning area according to the judgment result, so as to acquire the scan image of the part corresponding to the scanning area; The acquisition module includes: The second scanning unit is used to rescan the target position when the determination result is that the first excitation pulse signal and the second excitation pulse signal do not act on the same layer of the scanning area, until the first excitation pulse signal and the second excitation pulse signal act on the same layer of the scanning area, and then scan the part corresponding to the scanning area to acquire the scan image of the part corresponding to the scanning area.

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, it implements the steps of the method according to any one of claims 1 to 8.

Images