Imaging method and device based on parallel imaging, storage medium and terminal

Abstract

The application discloses an imaging method and device based on parallel imaging, a storage medium and a terminal, relates to the technical field of image data processing, and mainly aims to solve the problem of poor image data accuracy of existing magnetic resonance imaging. The method comprises the following steps: acquiring a first phase encoding interval of parallel imaging pre-scanning, and performing parallel imaging pre-scanning based on a target magnetic resonance sequence and the first phase encoding interval to obtain first imaging data; determining a second phase encoding interval of parallel imaging formal scanning corresponding to the first phase encoding interval, and performing parallel imaging formal scanning based on the target magnetic resonance sequence and the second phase encoding interval to obtain second imaging data; acquiring coil sensitivity information based on the first imaging data, and acquiring a magnetic resonance image based on at least the second imaging data and the coil sensitivity information.

Description

Technical Field

[0001] This invention relates to the field of image data processing technology, and in particular to an imaging method and apparatus, storage medium, and terminal based on parallel imaging. Background Technology

[0002] Magnetic Resonance Imaging (MRI) is one of the main imaging methods in modern medical imaging. Its basic principle is to obtain image information using the magnetic resonance phenomenon. However, MRI acquisition is relatively slow. To improve clinical usability, parallel imaging techniques are widely used in the acquisition of various MRI sequences. Parallel imaging techniques, especially SENSE (Sensitivity Encoding), recover full-sampled data from downsampled data by acquiring information on the spatial sensitivity of multi-channel surface coils. In other words, SENSE parallel imaging relies on a separate SENSE pre-scan to obtain the coil sensitivity map (CSM), thereby recovering full-sampled data from downsampled data. Because the MRI sequences for the SENSE pre-scan and the normal SENSE scan are different, artifacts can occur during dealiasing, reducing the accuracy of the MRI image data. Summary of the Invention

[0003] In view of this, the present invention provides an imaging method and device, storage medium and terminal based on parallel imaging, the main purpose of which is to solve the problem of poor image data accuracy in existing magnetic resonance imaging.

[0004] According to one aspect of the present invention, an imaging method based on parallel imaging is provided, comprising:

[0005] The first phase coding interval of the parallel imaging pre-scan is obtained, and the parallel imaging pre-scan is performed based on the target magnetic resonance sequence and the first phase coding interval to obtain the first imaging data;

[0006] Determine the second phase coding interval corresponding to the first phase coding interval for parallel imaging formal scanning, and perform parallel imaging formal scanning based on the target magnetic resonance sequence and the second phase coding interval to obtain the second imaging data;

[0007] Based on the first imaging data, coil sensitivity information is obtained, and at least based on the second imaging data and the coil sensitivity information, a magnetic resonance image is obtained.

[0008] Furthermore, the method also includes:

[0009] Based on the first imaging data, shared data is obtained, wherein the phase encoding of the shared data and the phase encoding of the second phase encoding interval have overlapping encoding positions;

[0010] The second imaging data does not include data at the overlapping encoded position. After obtaining the second imaging data through parallel imaging scanning based on the target magnetic resonance sequence and the second phase encoding, the method further includes:

[0011] The target imaging data is extracted from the first imaging data, and the second imaging data is filled based on the target imaging data.

[0012] Further, the step of acquiring shared data based on the first imaging data includes:

[0013] If the second phase coding interval is an integer multiple of the first phase coding interval, then target imaging data matching the integer multiple is extracted from the first imaging data, and the target imaging data constitutes the shared data.

[0014] Further, the step of acquiring shared data based on the first imaging data includes:

[0015] If the second phase coding interval is a non-integer multiple of the first phase coding interval, then the first imaging data is interpolated based on the Fourier transform interpolation method, and target imaging data is extracted from the interpolated first imaging data, wherein the target imaging data constitutes the shared data.

[0016] Furthermore, the parallel imaging pre-scanning based on the target magnetic resonance sequence and the first phase encoding interval to obtain the first imaging data includes:

[0017] Parallel imaging pre-scanning of the target magnetic resonance sequence and the first phase encoding interval is performed according to the first coil and the second coil respectively to obtain the imaging data corresponding to the first coil and the imaging data corresponding to the second coil, and the imaging data corresponding to the second coil is determined as the first imaging data;

[0018] The parallel imaging formal scan based on the target magnetic resonance sequence and the second phase encoding to obtain the second imaging data includes:

[0019] The second imaging data is obtained by performing the target magnetic resonance sequence and the second phase encoding parallel imaging formal scan according to the second coil.

[0020] Further, the step of acquiring coil sensitivity information based on the first imaging data, and acquiring magnetic resonance images based at least on the second imaging data and the coil sensitivity information, includes:

[0021] Based on the ratio of the imaging data corresponding to the first coil and the second coil, spatial sensitivity information is generated, and based on the spatial sensitivity information, at least the second imaging data is de-aliased to obtain magnetic resonance imaging.

[0022] Furthermore, the acquisition of the first phase encoding interval for parallel imaging pre-scanning includes:

[0023] Receive a first imaging range parameter configured for parallel imaging pre-scanning, and configure the reciprocal of the first imaging range parameter as a first phase encoding interval.

[0024] Further, determining the second phase coding interval corresponding to the first phase coding interval for the parallel imaging formal scan includes:

[0025] Determine the second imaging scan parameters for the parallel imaging formal scan, wherein the first imaging range parameter is greater than the second imaging range parameter;

[0026] The reciprocal of the second imaging range parameter is configured as the second phase encoding interval.

[0027] Furthermore, the method also includes:

[0028] The number of scan lines corresponding to the parallel imaging pre-scan using K-space data filling and the parallel imaging formal scan is determined, and the first phase encoding interval and the second phase encoding interval are adjusted based on the number of scan lines.

[0029] According to another aspect of the present invention, an imaging device based on parallel imaging is provided, comprising:

[0030] The acquisition module is used to acquire the first phase coding interval of the parallel imaging pre-scan, and perform parallel imaging pre-scan based on the target magnetic resonance sequence and the first phase coding interval to obtain the first imaging data;

[0031] The determining module is used to determine the second phase coding interval corresponding to the first phase coding interval for parallel imaging formal scanning, and to perform parallel imaging formal scanning based on the target magnetic resonance sequence and the second phase coding interval to obtain the second imaging data;

[0032] An imaging module is used to acquire coil sensitivity information based on the first imaging data, and to acquire magnetic resonance images based at least on the second imaging data and the coil sensitivity information.

[0033] Furthermore, the acquisition module is also used to acquire shared data based on the first imaging data, wherein the phase encoding of the shared data and the phase encoding of the second phase encoding interval have overlapping encoding positions;

[0034] The second imaging data does not include data at the overlapping encoded position, and the device further includes:

[0035] A filling module is used to extract the target imaging data from the first imaging data and fill the second imaging data based on the target imaging data.

[0036] Furthermore, the acquisition module is specifically used to extract target imaging data matching the integer multiple ratio from the first imaging data if the second phase encoding interval is an integer multiple ratio of the first phase encoding interval, and the target imaging data constitutes the shared data.

[0037] Furthermore, the acquisition module is specifically used to perform interpolation processing on the first imaging data based on Fourier transform interpolation if the second phase encoding interval is a non-integer multiple of the first phase encoding interval, and to extract target imaging data from the interpolated first imaging data, wherein the target imaging data constitutes the shared data.

[0038] Furthermore, the acquisition module is specifically used to perform parallel imaging pre-scanning of the target magnetic resonance sequence and the first phase encoding interval according to the first coil and the second coil respectively, to obtain the imaging data corresponding to the first coil and the imaging data corresponding to the second coil, and to determine the imaging data corresponding to the second coil as the first imaging data;

[0039] The determining module is specifically used to perform the target magnetic resonance sequence and the second phase encoding parallel imaging formal scan according to the second coil to obtain the second imaging data.

[0040] Furthermore,

[0041] The imaging module is specifically used to generate spatial sensitivity information based on the ratio of the imaging data corresponding to the first coil and the second coil, and to perform signal dealiasing on the second imaging data based on the spatial sensitivity information to obtain magnetic resonance imaging.

[0042] Furthermore, the acquisition module is specifically configured to receive a first imaging range parameter configured for parallel imaging pre-scanning, and to configure the reciprocal of the first imaging range parameter as a first phase encoding interval.

[0043] Furthermore, the determining module includes:

[0044] A determining unit is used to determine the second imaging scanning parameters of the parallel imaging formal scan, wherein the first imaging range parameter is greater than the second imaging range parameter;

[0045] A configuration unit is used to configure the reciprocal of the second imaging range parameter as the second phase encoding interval.

[0046] Furthermore, the device also includes:

[0047] The adjustment module is used to determine the number of scan lines corresponding to the parallel imaging pre-scan using K-space data filling and the parallel imaging formal scan, and to adjust the first phase encoding interval and the second phase encoding interval based on the number of scan lines.

[0048] According to another aspect of the present invention, a storage medium is provided, wherein at least one executable instruction is stored therein, the executable instruction causing a processor to perform operations corresponding to the imaging method based on parallel imaging described above.

[0049] According to another aspect of the present invention, a terminal is provided, comprising: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other through the communication bus;

[0050] The memory is used to store at least one executable instruction, which causes the processor to perform the operation corresponding to the above-described parallel imaging-based imaging method.

[0051] By employing the above-described technical solutions, the technical solutions provided by the embodiments of the present invention have at least the following advantages:

[0052] This invention provides an imaging method, apparatus, storage medium, and terminal based on parallel imaging. Compared with existing technologies, the embodiments of this invention obtain a first phase coding interval for parallel imaging pre-scanning and perform parallel imaging pre-scanning based on a target magnetic resonance sequence and the first phase coding interval to obtain first imaging data; determine a second phase coding interval for parallel imaging formal scanning corresponding to the first phase coding interval, and perform parallel imaging formal scanning based on the target magnetic resonance sequence and the second phase coding interval to obtain second imaging data; obtain coil sensitivity information based on the first imaging data, and at least obtain magnetic resonance images based on the second imaging data and the coil sensitivity information. This increases the matching degree of the spatial sensitivity information of the coil during pre-scanning and normal scanning, reduces the generation of artifacts during dealiasing, greatly saves magnetic resonance scanning time, improves the signal-to-noise ratio, and thus improves the accuracy of magnetic resonance imaging image data.

[0053] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0054] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0055] Figure 1 A flowchart of an imaging method based on parallel imaging provided by an embodiment of the present invention is shown;

[0056] Figure 2 This diagram illustrates an embodiment of the present invention for extracting imaging data by scanning lines.

[0057] Figure 3 This diagram illustrates a parallel magnetic resonance imaging method provided by an embodiment of the present invention.

[0058] Figure 4 A flowchart of another imaging method based on parallel imaging provided by an embodiment of the present invention is shown;

[0059] Figure 5 This illustration shows another schematic diagram of filling by extracting imaging data through scanning lines according to an embodiment of the present invention;

[0060] Figure 6 A block diagram of an imaging device based on parallel imaging provided by an embodiment of the present invention is shown;

[0061] Figure 7 A schematic diagram of the structure of a terminal provided in an embodiment of the present invention is shown. Detailed Implementation

[0062] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0063] In related technologies, the echo time (TE) of Fast Field Echo (FFE) sequences can be very short, generally very fast. Therefore, an FFE sequence with a large field of view (FOV) is usually used in a single SENSE pre-scan. In subsequent high-resolution imaging scans, other magnetic resonance sequences, such as Turbo Spin Echo (TSE) sequences, are used. When the FOV is large or the scan is off-center, the image will exhibit a certain degree of geometric distortion at the edges of the field. The inventors of this application have discovered that different scanning sequences produce different distortions due to their varying sensitivity to the field. Using the CSM obtained from the SENSE pre-scan using an FFE sequence to solve the image obtained from the formal TSE scan results in artifacts due to mismatched coil sensitivity CSMs, thus reducing the accuracy of the magnetic resonance imaging image data. Based on the above problems, this invention provides an imaging method based on parallel imaging, such as... Figure 1 As shown, the method includes:

[0064] 101. Obtain the first phase coding interval of the parallel imaging pre-scan, and perform parallel imaging pre-scan based on the target magnetic resonance sequence and the first phase coding interval to obtain the first imaging data.

[0065] In this embodiment of the invention, the current execution entity can be a server connected to the magnetic resonance imaging (MRI) device or a terminal embedded in the MRI device. When performing MRI on a human body, the parallel imaging technology used is one that requires pre-scanning to acquire coil sensitivity information (CSM). Therefore, parallel imaging includes, but is not limited to, SENSE (SeNSitivity Encoding) parallel imaging technology, thereby performing SENSE dealiasing on the imaging data acquired in the formal scan based on the CSM corresponding to the pre-scan parallel imaging. The first phase encoding interval is equal to the field of view (FOV) parameter of the pre-scan. CSM It is directly proportional to the reciprocal of FOV CSM This can be pre-configured, thus obtaining the first phase encoding interval δk. CSM =1 / FOV CSM Simultaneously, the target magnetic resonance sequence is the same as that used in the formal scan. For example, if the magnetic resonance sequence used in the formal parallel imaging scan is a magnetic resonance TSE sequence, then the magnetic resonance sequence used in the pre-scan of parallel imaging is also configured as a magnetic resonance TSE sequence. Thus, based on the same magnetic resonance sequence as the formal parallel imaging scan and the first phase encoding interval, a pre-scan of parallel imaging is performed to obtain the first imaging data. At this time, the first imaging data is the image data obtained by the parallel magnetic resonance imaging pre-scan, and this embodiment of the invention does not impose specific limitations.

[0066] 102. Determine the second phase encoding interval corresponding to the first phase encoding interval for parallel imaging formal scanning, and perform parallel imaging formal scanning based on the target magnetic resonance sequence and the second phase encoding interval to obtain the second imaging data.

[0067] In this embodiment of the invention, the parallel imaging pre-scan and the corresponding parallel imaging formal scan are performed according to the second phase encoding interval and the same target magnetic resonance imaging sequence. The second phase encoding interval is proportional to the reciprocal of the field of view (FOV) parameter of the formal scan. The FOV can be configured in the magnetic resonance scanning interface to obtain the second phase encoding interval δk = 1 / FOV. In order to preserve phase information and correct for the uniformity of the volume coil, the imaging range parameter of the pre-scan window is larger than that of the formal scan window, thereby making the first phase encoding interval δk... CSM The second imaging data is obtained by performing a parallel imaging formal scan based on the same target magnetic resonance imaging sequence (TSE sequence) and the second phase encoding δk, with the second phase encoding δk being less than the second phase encoding interval δk. At this point, the second imaging data is the image data obtained from the parallel magnetic resonance imaging formal scan; this embodiment of the invention does not impose specific limitations.

[0068] It should be noted that, in order for the current execution end to automatically determine the second phase encoding interval that matches the first phase encoding interval, a scan ratio is pre-configured, namely the ratio of the first imaging range parameter (the imaging range parameter of the parallel imaging pre-scan window) to the second imaging range parameter (the imaging range parameter of the parallel imaging formal scan window). This allows the second phase encoding interval that matches the first phase encoding interval to be determined according to the scan ratio. Furthermore, since the imaging range parameters or resolutions of the windows corresponding to different human body parts may differ, and different coils are used to scan different human body parts, the same coil must be used for both the parallel imaging pre-scan and the parallel imaging formal scan to ensure imaging accuracy.

[0069] 103. Obtain coil sensitivity information based on the first imaging data, and obtain magnetic resonance images based at least on the second imaging data and the coil sensitivity information.

[0070] In this embodiment of the invention, since the parallel imaging pre-scanning process is based on two coils, the coil sensitivity information can be determined based on the first imaging data, and magnetic resonance imaging can be performed in combination with the second imaging data. This greatly increases the matching degree of spatial sensitivity information, reduces the generation of artifacts during dealiasing, saves magnetic resonance scanning time, and thus improves the accuracy of magnetic resonance imaging image data.

[0071] In another embodiment of the invention, for further definition and explanation, the steps further include: acquiring shared data based on the first imaging data, wherein the phase encoding of the shared data and the second phase encoding have overlapping encoding positions.

[0072] The shared data can be obtained by extracting part or all of the first imaging data, or it can be obtained by extracting at least a portion of the interpolated first imaging data after interpolating the first imaging data.

[0073] Specifically, the second imaging data does not include data at the overlapping encoded position. After obtaining the second imaging data by performing a parallel imaging formal scan based on the target magnetic resonance sequence and the second phase encoding, the method further includes:

[0074] The target imaging data is extracted from the first imaging data, and the second imaging data is filled based on the target imaging data.

[0075] In this embodiment of the invention, since the second imaging data does not include the data of the overlapping coding position, that is, the data of the overlapping coding position is not collected, the normal scanning time is reduced. By sharing data, the reconstructed data for reconstructing the magnetic resonance image is obtained. In other words, in order to save scanning time by not completely scanning the data corresponding to the required scan lines in the parallel imaging during the formal parallel imaging scan, shared data that can be shared is obtained based on the first imaging data. The shared data includes the data of the lines not scanned during the normal parallel imaging scan. The second imaging data is filled with the shared data to obtain the data equivalent to completely scanning the scan lines corresponding to the required scan lines in the parallel imaging. It can be understood that the number of scan lines in the second imaging data is less than the number of scan lines after the shared data is filled into the second imaging data.

[0076] In another embodiment of the invention, acquiring shared data based on the first imaging data includes:

[0077] If the second phase coding interval is an integer multiple of the first phase coding interval, then target imaging data matching the integer multiple is extracted from the first imaging data, and the target imaging data is added to the second imaging data.

[0078] For example, such as Figure 2 As shown, the dashed lines represent the scan lines corresponding to the first imaging data, and the solid lines represent the scan lines corresponding to the second imaging data. At this point, 2δk CSM=δk, therefore, the scan lines corresponding to the two second imaging data contain the scan lines corresponding to the three first imaging data. Target imaging data can be extracted from the first imaging data and used to fill the second imaging data, thereby reducing the time spent on repeated acquisition.

[0079] In this embodiment of the invention, since the second phase encoding interval is an integer multiple of the first phase encoding interval, in order to accurately fill the second imaging data based on the first imaging data, specifically, if the scanning ratio is an integer multiple, such as the ratio of the first imaging range parameter (the imaging range parameter of the parallel imaging pre-scan window) to the second imaging range parameter (the imaging range parameter of the parallel imaging formal scan window) being 2, i.e., FOV... CSM =2FOV, determining that the ratio of the first phase encoding interval to the second phase encoding interval is one-half, therefore, target imaging data can be directly extracted from the first imaging data in integer multiples, such as... Figure 2 As shown, the target imaging data corresponding to the dashed lines is extracted and filled into the second imaging data. Furthermore, in this embodiment of the invention, since the integer multiple ratio is the proportional relationship between the first imaging range parameter and the second imaging range parameter, the first phase encoding interval determined based on the first imaging range parameter will be less than and include the first phase encoding interval determined based on the second imaging range parameter. During the actual scanning process, these scan lines that repeatedly cover the scan can be removed from the acquisition process. Instead, target imaging data (also shared data) matching the integer multiple ratio is extracted from the first imaging data and added to the second imaging data, thereby saving acquisition time. The scan lines corresponding to the target imaging data are the scan lines that repeatedly cover the scan according to the second phase encoding interval corresponding to the second imaging range parameter; this embodiment of the invention does not impose specific limitations on this.

[0080] In another embodiment of the invention, for further definition and explanation, the steps further include: if the second phase coding interval is a non-integer multiple of the first phase coding interval, then the first imaging data is interpolated based on the Fourier transform interpolation method, and then target imaging data is extracted from the interpolated first imaging data, wherein the target imaging data constitutes the shared data.

[0081] In this embodiment of the invention, since the scanning ratio can also be a non-integer multiple, in order to accurately fill the second imaging data based on the first imaging data to obtain magnetic resonance image reconstruction data with a larger information content than the second imaging data, if the scanning ratio is a non-integer ratio, such as the ratio of the first imaging range parameter (the imaging range parameter of the parallel imaging pre-scan window) to the second imaging range parameter (the imaging range parameter of the parallel imaging formal scan window) being 1.5, i.e., FOV... CSM=1.5FOV, determining the ratio of the first phase encoding interval to the second phase encoding interval to be two-thirds. In this case, to ensure that the extracted target imaging data obtains shared data and thus fills the second imaging data, target imaging data matching the ratio of the first phase encoding interval to the second phase encoding interval is extracted from the first imaging data using Fourier transform interpolation. This target imaging data is then used to fill the second imaging data. For example, extracting the first imaging data from the SENSE pre-scan by 4 times can obtain the k-space imaging data corresponding to the 16 lines at the very center of the formal scan. Since the formal scan has a 2x SENSE scan downsampling, the actual phase encoding number can be 128. The SENSE pre-scan can provide 1 / 8 of the line number of imaging data for subsequent formal acquisition. This embodiment of the invention does not impose specific limitations.

[0082] It should be noted that if the ratio of the first phase encoding interval to the second phase encoding interval is not an integer ratio, it indicates that there are non-overlapping scan lines between the first imaging data and the second imaging data, and the target imaging data cannot be directly extracted for replacement. Therefore, the scan lines are extracted using the Fourier transform difference method, and the imaging data corresponding to the extracted scan lines is used as the target imaging data to replace the second imaging data. This embodiment of the invention does not make specific limitations on the scan lines extracted by Fourier transform difference, thereby improving the accuracy of the imaging data.

[0083] In another embodiment of the invention, for further definition and explanation, the step of performing parallel imaging pre-scanning based on the target magnetic resonance sequence and the first phase encoding interval to obtain the first imaging data includes: performing parallel imaging pre-scanning of the target magnetic resonance sequence and the first phase encoding interval according to the first coil and the second coil respectively, obtaining the imaging data corresponding to the first coil and the imaging data corresponding to the second coil, and determining the imaging data corresponding to the second coil as the first imaging data.

[0084] In this embodiment of the invention, since parallel imaging pre-scanning requires scanning using two different coils, to save scanning time, the target magnetic resonance sequence and parallel imaging pre-scanning according to the first coil and the second coil are performed separately during parallel imaging pre-scanning to save scanning time. At this time, since parallel imaging pre-scanning is performed using two different coils, to match the imaging data during the actual parallel imaging scan and save scanning time, the imaging data corresponding to the same second coil used in the actual parallel imaging scan is used as the first imaging data. For example, during SENSE pre-scanning, two parallel imaging pre-scans of the same magnetic resonance sequence are performed using the first coil (e.g., a quadrature body coil, QBC coil) and the second coil (e.g., a multi-channel surface phased array coil). If the second coil is used during the actual SENSE scan, the imaging data acquired by the second coil during the pre-scan is used as the first imaging data. The target imaging data is then extracted from the first imaging data to replace the second imaging data obtained using the second coil during the actual scan, thereby saving imaging time.

[0085] Corresponding to the above method, the step of performing a parallel imaging formal scan based on the target magnetic resonance sequence and the second phase encoding to obtain the second imaging data includes: performing a parallel imaging formal scan of the target magnetic resonance sequence and the second phase encoding according to the second coil to obtain the second imaging data.

[0086] In this embodiment of the invention, in order to save imaging time and ensure the relationship between imaging data obtained based on the same coil, during the parallel imaging formal scanning process, the target magnetic resonance sequence and the second phase encoding are executed according to the second coil corresponding to the parallel imaging pre-scan to obtain the second imaging data.

[0087] In another embodiment of the present invention, for further definition and explanation, the step of obtaining coil sensitivity information based on the first imaging data and obtaining a magnetic resonance image based at least on the second imaging data and the coil sensitivity information includes: generating spatial sensitivity information based on the ratio of the imaging data corresponding to the first coil and the second coil, and performing signal dealiasing on the second imaging data based at least on the spatial sensitivity information to obtain a magnetic resonance image.

[0088] To reduce artifacts arising from spatial sensitivity information obtained from two magnetic resonance scans, this embodiment of the invention combines the same magnetic resonance sequence, such as the TSE sequence, and generates spatial sensitivity information based on the ratio of imaging data corresponding to the first coil and the second coil after performing parallel imaging pre-scan. For example, the spatial sensitivity information CSM is obtained by comparing the imaging data of the first coil (QBC) with the imaging data of the second coil (Array). The second coil can be the same coil used for both the pre-scan and the formal scan; this embodiment of the invention does not specifically limit the type of coil.

[0089] It should be noted that, regarding the dealiasing of the second imaging data filled or replaced based on spatial sensitivity information, this means, under the known 2x downsampling mode, accurately determining the image data values ​​at target point P corresponding to the two coils. P1 and P2 are equal to the weighted sum of the signals at points A and B and the sensitivities of each coil S1A, S1B, S2A, and S2B, thereby calculating the spatial values ​​at points A and B. Each image data is pre-scanned to obtain the coil sensitivity as spatial sensitivity information, thus dealiasing signals that were originally spatially different but aliased together, completing parallel magnetic resonance imaging. Figure 3 As shown.

[0090] In another embodiment of the invention, for further definition and explanation, the step of obtaining the first phase coding interval of the parallel imaging pre-scan includes: receiving a first imaging range parameter configured for the parallel imaging pre-scan, and configuring the reciprocal of the first imaging range parameter as the first phase coding interval.

[0091] In this embodiment of the invention, since the current execution subject can be a magnetic resonance system, and the phase encoding interval is proportional to the reciprocal of the imaging range parameter, for the first phase encoding interval, the derivative of the first imaging range parameter can be configured as the first phase encoding interval based on the first imaging range parameter received at the system front end, thereby satisfying the rapid configuration of parallel imaging pre-scanning and saving scanning time.

[0092] In another embodiment of the invention, for further definition and explanation, such as Figure 4 As shown, the step of determining the second phase coding interval corresponding to the first phase coding interval for parallel imaging formal scanning includes:

[0093] 201. Determine the second imaging scan parameters for the parallel imaging formal scan;

[0094] 202. Configure the reciprocal of the second imaging range parameter as the second phase encoding interval.

[0095] Wherein, the first imaging range parameter is greater than the second imaging range parameter.

[0096] The specific implementation process can be as follows: determine the scanning ratio corresponding to the parallel imaging pre-scan and the parallel imaging formal scan; determine the second imaging range parameter that matches the first imaging range parameter based on the scanning ratio; configure the reciprocal of the second imaging range parameter as the second phase encoding interval.

[0097] In this embodiment of the invention, to meet the needs of different parallel magnetic resonance imaging, the current execution entity can pre-configure and store the scan ratio based on the front-end interface, thereby determining the second phase code based on the scan ratio after determining the first phase code. The first phase code can be determined based on a first imaging range parameter selected during the parallel imaging pre-scan, and then the second phase code is determined by combining the scan ratio (the ratio of the first imaging range parameter to the second imaging range parameter). Simultaneously, to accurately utilize the target imaging data extracted from the first imaging data to fill the second imaging data, the first imaging range parameter is larger than the second imaging range parameter, thus the second phase code interval can be configured based on the second imaging range parameter.

[0098] In another embodiment of the invention, for further definition and explanation, the steps further include: determining the number of scan lines corresponding to the parallel imaging pre-scan and the parallel imaging formal scan using K-space data filling, and adjusting the first phase encoding interval and the second phase encoding interval based on the number of scan lines.

[0099] In this embodiment of the invention, since the spatial sensitivity information is relatively smooth, parallel imaging pre-scanning is a low-resolution scanning acquisition process. Therefore, the first phase encoding interval and the second phase encoding interval can be adjusted by the number of scan lines to obtain imaging data mapped to the number of scan lines in k-space. That is, parallel pre-scanning and formal scanning are performed using K-space data filling. Specifically, K-space is Fourier space, which is the filling space of the original magnetic resonance (MR) signal data with spatial positioning encoding information. Each MR image has a corresponding K-space data matrix. Performing Fourier transform on the K-space data is to decode the spatial positioning encoding information in the original data, decomposing it into MR signals of different frequencies, phases, and amplitudes. Different frequencies and phases represent different spatial locations, and amplitudes represent MR signal strength, thereby obtaining MR image data. The Fourier transform is the process of transforming the original data matrix in K-space into a magnetic resonance image matrix. The acquired MR signal fills a line in one direction in K-space, which becomes the phase encoding line, i.e., the scan line. Therefore, in order to achieve low-resolution scanning, scanning is performed with a small number of scan lines, thereby expanding the phase encoding interval and saving scanning time. Specifically, parallel imaging pre-scan and parallel imaging formal scan can be based on configuring a low-resolution acquisition matrix N, respectively. CSMN determines the maximum number of scan lines kmax. CSM The maximum number of scan lines (kmax) and the smaller field of view (FOV) allow for adjustments to the first and second phase encoding intervals, thereby increasing the phase encoding interval and saving scan time. For example, kmax... CSM =N CSM / 2*δk CSM kmax = N / 2 * δk, thereby allowing adjustment of the first phase encoding interval and the second phase encoding interval to acquire the first imaging data and the second imaging data, such as... Figure 5 As shown, in this embodiment of the invention, for the acquisition matrix N CSM N is not specifically limited.

[0100] This invention provides an imaging method based on parallel imaging. Compared with existing technologies, the embodiments of this invention obtain a first phase coding interval for parallel imaging pre-scanning and perform parallel imaging pre-scanning based on the target magnetic resonance sequence and the first phase coding interval to obtain first imaging data; determine a second phase coding interval for parallel imaging formal scanning corresponding to the first phase coding interval, and perform parallel imaging formal scanning based on the target magnetic resonance sequence and the second phase coding interval to obtain second imaging data; obtain coil sensitivity information based on the first imaging data, and at least obtain magnetic resonance images based on the second imaging data and the coil sensitivity information. This increases the matching degree of spatial sensitivity information, reduces the generation of artifacts during dealiasing, greatly saves magnetic resonance scanning time, improves the signal-to-noise ratio, and thus improves the accuracy of magnetic resonance imaging image data.

[0101] Furthermore, as a response to the above Figure 1 The implementation of the method shown in this invention provides an imaging device based on parallel imaging, such as... Figure 6 As shown, the device includes:

[0102] The acquisition module 31 is used to acquire the first phase coding interval of the parallel imaging pre-scan, and perform parallel imaging pre-scan based on the target magnetic resonance sequence and the first phase coding interval to obtain the first imaging data;

[0103] The determining module 32 is used to determine the second phase coding interval corresponding to the first phase coding interval for parallel imaging formal scanning, and to perform parallel imaging formal scanning based on the target magnetic resonance sequence and the second phase coding interval to obtain the second imaging data;

[0104] The imaging module 33 is used to acquire coil sensitivity information based on the first imaging data, and to acquire magnetic resonance images based at least on the second imaging data and the coil sensitivity information.

[0105] Furthermore, the acquisition module is also used to acquire shared data based on the first imaging data, wherein the phase encoding of the shared data and the phase encoding of the second phase encoding interval have overlapping encoding positions;

[0106] The second imaging data does not include data at the overlapping encoded position, and the device further includes:

[0107] A filling module is used to extract the target imaging data from the first imaging data and fill the second imaging data based on the target imaging data.

[0108] Furthermore, the acquisition module is specifically used to extract target imaging data matching the integer multiple ratio from the first imaging data if the second phase encoding interval is an integer multiple ratio of the first phase encoding interval, and the target imaging data constitutes the shared data.

[0109] Furthermore, the acquisition module is specifically used to perform interpolation processing on the first imaging data based on Fourier transform interpolation if the second phase encoding interval is a non-integer multiple of the first phase encoding interval, and to extract target imaging data from the interpolated first imaging data, wherein the target imaging data constitutes the shared data.

[0110] Furthermore, the acquisition module is specifically used to perform parallel imaging pre-scanning of the target magnetic resonance sequence and the first phase encoding interval according to the first coil and the second coil respectively, to obtain the imaging data corresponding to the first coil and the imaging data corresponding to the second coil, and to determine the imaging data corresponding to the second coil as the first imaging data;

[0111] The determining module is specifically used to perform the target magnetic resonance sequence and the second phase encoding parallel imaging formal scan according to the second coil to obtain the second imaging data.

[0112] Furthermore,

[0113] The imaging module is specifically used to generate spatial sensitivity information based on the ratio of the imaging data corresponding to the first coil and the second coil, and to perform signal dealiasing on the second imaging data based on the spatial sensitivity information to obtain magnetic resonance imaging.

[0114] Furthermore, the acquisition module is specifically configured to receive a first imaging range parameter configured for parallel imaging pre-scanning, and to configure the reciprocal of the first imaging range parameter as a first phase encoding interval.

[0115] Furthermore, the determining module includes:

[0116] A determining unit is used to determine the second imaging scanning parameters of the parallel imaging formal scan, wherein the first imaging range parameter is greater than the second imaging range parameter;

[0117] A configuration unit is used to configure the reciprocal of the second imaging range parameter as the second phase encoding interval.

[0118] Furthermore, the device also includes:

[0119] The adjustment module is used to determine the number of scan lines corresponding to the parallel imaging pre-scan using K-space data filling and the parallel imaging formal scan, and to adjust the first phase encoding interval and the second phase encoding interval based on the number of scan lines.

[0120] According to another aspect of the present invention, a storage medium is provided, wherein at least one executable instruction is stored therein, the executable instruction causing a processor to perform operations corresponding to the imaging method based on parallel imaging described above.

[0121] According to another aspect of the present invention, a terminal is provided, comprising: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other through the communication bus;

[0122] The memory is used to store at least one executable instruction, which causes the processor to perform the operation corresponding to the above-described parallel imaging-based imaging method.

[0123] This invention provides an imaging device based on parallel imaging. Compared with the prior art, the embodiments of this invention obtain a first phase coding interval for parallel imaging pre-scanning, and perform parallel imaging pre-scanning based on the target magnetic resonance sequence and the first phase coding interval to obtain first imaging data; determine a second phase coding interval for parallel imaging formal scanning corresponding to the first phase coding interval based on the scanning ratio, and perform parallel imaging formal scanning based on the target magnetic resonance sequence and the second phase coding interval to obtain second imaging data; obtain coil sensitivity information based on the first imaging data, and at least obtain magnetic resonance images based on the second imaging data and the coil sensitivity information, thereby increasing the matching degree of spatial sensitivity information, reducing the generation of artifacts during dealiasing, greatly saving magnetic resonance scanning time, improving the signal-to-noise ratio, and thus improving the accuracy of magnetic resonance imaging image data.

[0124] According to one embodiment of the present invention, a storage medium is provided, the storage medium storing at least one executable instruction, the computer-executable instruction being capable of executing the imaging method based on parallel imaging in any of the above method embodiments.

[0125] Figure 7The diagram shows a structural schematic of a terminal according to an embodiment of the present invention. The specific implementation of the terminal is not limited by the specific embodiments of the present invention.

[0126] like Figure 7 As shown, the terminal may include: a processor 402, a communications interface 404, a memory 406, and a communications bus 408.

[0127] The processor 402, communication interface 404, and memory 406 communicate with each other via communication bus 408.

[0128] Communication interface 404 is used to communicate with other network elements such as clients or other servers.

[0129] The processor 402 is used to execute program 410, specifically the relevant steps in the above-described embodiments of the imaging method based on parallel imaging.

[0130] Specifically, program 410 may include program code that includes computer operation instructions.

[0131] Processor 402 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention. The terminal may include one or more processors of the same type, such as one or more CPUs; or it may include processors of different types, such as one or more CPUs and one or more ASICs.

[0132] Memory 406 is used to store program 410. Memory 406 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0133] Specifically, program 410 can be used to cause processor 402 to perform the following operations:

[0134] The first phase coding interval of the parallel imaging pre-scan is obtained, and the parallel imaging pre-scan is performed based on the target magnetic resonance sequence and the first phase coding interval to obtain the first imaging data;

[0135] Determine the second phase coding interval corresponding to the first phase coding interval for parallel imaging formal scanning, and perform parallel imaging formal scanning based on the target magnetic resonance sequence and the second phase coding interval to obtain the second imaging data;

[0136] Based on the first imaging data, coil sensitivity information is obtained, and at least based on the second imaging data and the coil sensitivity information, a magnetic resonance image is obtained.

[0137] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0138] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An imaging method based on parallel imaging, characterized in that, include: The first phase coding interval of the parallel imaging pre-scan is obtained, and the parallel imaging pre-scan is performed based on the target magnetic resonance sequence and the first phase coding interval to obtain the first imaging data; A second phase coding interval corresponding to the first phase coding interval is determined, and a parallel imaging formal scan is performed based on the target magnetic resonance sequence and the second phase coding interval to obtain second imaging data, wherein the first phase coding interval is smaller than the second phase coding interval. Based on the first imaging data, coil sensitivity information is obtained; based on the second imaging data and the coil sensitivity information, a magnetic resonance image is obtained; or, Based on the first imaging data, shared data is obtained. The phase encoding of the shared data and the phase encoding of the second phase encoding interval have overlapping encoding positions. The second imaging data does not contain data at the overlapping encoding positions. Target imaging data is extracted from the first imaging data, and the second imaging data is filled based on the target imaging data, wherein the target imaging data is the shared data; Based on the first imaging data, coil sensitivity information is obtained, and based on the filled second imaging data and the coil sensitivity information, a magnetic resonance image is obtained.

2. The method according to claim 1, characterized in that, The step of acquiring shared data based on the first imaging data includes: If the second phase coding interval is an integer multiple of the first phase coding interval, then target imaging data matching the integer multiple is extracted from the first imaging data, and the target imaging data constitutes the shared data.

3. The method according to claim 1, characterized in that, The step of acquiring shared data based on the first imaging data includes: If the second phase coding interval is a non-integer multiple of the first phase coding interval, then the first imaging data is interpolated based on the Fourier transform interpolation method, and target imaging data is extracted from the interpolated first imaging data, wherein the target imaging data constitutes the shared data.

4. The method according to claim 1, characterized in that, The parallel imaging pre-scan based on the target magnetic resonance sequence and the first phase encoding interval to obtain the first imaging data includes: Parallel imaging pre-scanning of the target magnetic resonance sequence and the first phase encoding interval is performed according to the first coil and the second coil respectively to obtain the imaging data corresponding to the first coil and the imaging data corresponding to the second coil, and the imaging data corresponding to the second coil is determined as the first imaging data; The parallel imaging formal scan based on the target magnetic resonance sequence and the second phase encoding to obtain the second imaging data includes: The second imaging data is obtained by performing the target magnetic resonance sequence and the second phase encoding parallel imaging formal scan according to the second coil.

5. The method according to claim 4, characterized in that, The step of acquiring coil sensitivity information based on the first imaging data, and acquiring magnetic resonance images based at least on the second imaging data and the coil sensitivity information, includes: Based on the ratio of the imaging data corresponding to the first coil and the second coil, spatial sensitivity information is generated, and based on the spatial sensitivity information, at least the second imaging data is de-aliased to obtain magnetic resonance imaging.

6. The method according to claim 1, characterized in that, The first phase encoding interval for obtaining the parallel imaging pre-scan includes: Receive a first imaging range parameter configured for parallel imaging pre-scanning, and configure the reciprocal of the first imaging range parameter as a first phase encoding interval.

7. The method according to claim 6, characterized in that, The determination of the second phase coding interval corresponding to the first phase coding interval for the parallel imaging formal scan includes: Determine the second imaging scan parameters for the parallel imaging formal scan, wherein the first imaging range parameter is greater than the second imaging range parameter; The reciprocal of the second imaging range parameter is configured as the second phase encoding interval.

8. The method according to any one of claims 1-7, characterized in that, The method further includes: The number of scan lines corresponding to the parallel imaging pre-scan using K-space data filling and the parallel imaging formal scan is determined, and the first phase encoding interval and the second phase encoding interval are adjusted based on the number of scan lines.

9. An imaging device based on parallel imaging, characterized in that, include: The acquisition module is used to acquire the first phase coding interval of the parallel imaging pre-scan, and perform parallel imaging pre-scan based on the target magnetic resonance sequence and the first phase coding interval to obtain the first imaging data; The determining module is used to determine the second phase coding interval corresponding to the first phase coding interval for parallel imaging formal scanning, and to perform parallel imaging formal scanning based on the target magnetic resonance sequence and the second phase coding interval to obtain second imaging data, wherein the first phase coding interval is smaller than the second phase coding interval; An imaging module is used to acquire coil sensitivity information based on the first imaging data, and to acquire magnetic resonance images based on the second imaging data and the coil sensitivity information; or, The acquisition module is further configured to acquire shared data based on the first imaging data, wherein the phase encoding of the shared data and the phase encoding of the second phase encoding interval have overlapping encoding positions, and the second imaging data does not contain data at the overlapping encoding positions; A filling module is used to extract target imaging data from the first imaging data and fill the second imaging data based on the target imaging data, wherein the target imaging data is the shared data. An imaging module is used to acquire coil sensitivity information based on the first imaging data, and to acquire a magnetic resonance image based on the filled second imaging data and the coil sensitivity information.

10. A storage medium storing at least one executable instruction that causes a processor to perform an operation corresponding to the imaging method based on parallel imaging as described in any one of claims 1-8.

11. A terminal, comprising: The processor, memory, communication interface, and communication bus are provided, wherein the processor, memory, and communication interface communicate with each other via the communication bus. The memory is used to store at least one executable instruction that causes the processor to perform an operation corresponding to the imaging method based on parallel imaging as described in any one of claims 1-8.

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