Method for determining a sensitivity profile of a magnetic resonance receive coil

Abstract

The embodiment of the application discloses a method for determining the sensitivity distribution of a magnetic resonance receiving coil. The method comprises the following steps: obtaining a reference image, contrast information between at least two kinds of tissues corresponding to a target part in the reference image is suppressed; determining an initial radio frequency field map corresponding to the target part based on the reference image; obtaining a transmission field map of a transmission field where the target part is located, and determining the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target part based on the initial radio frequency field map and the transmission field map. According to the sensitivity distribution of the magnetic resonance receiving coil and the transmission field map of the transmission field, the uniformity correction of a magnetic resonance image under high field strength can be realized.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of magnetic resonance, in particular to a method for determining sensitivity distribution of a magnetic resonance receiving coil. BACKGROUND

[0002] In a magnetic resonance (MR) system, the distribution of the radio frequency field is not uniform, especially in high-field magnetic resonance, as the magnetic resonance field strength increases, the radio frequency field non-uniformity problem becomes more serious. The radio frequency field non-uniformity makes the contrast information of the image collected by MR uneven in brightness, which further affects the doctor's reading and diagnosis, image segmentation and other image post-processing analysis. Therefore, the radio frequency field uniformity correction is particularly important. In high field, the difficulty of uniformity correction also increases. In high field, in addition to the expected contrast information of different tissue structures in the image brightness information received by the local coil, there is also the emission field non-uniform distribution information and the receiving field non-uniform distribution information. In order to correct the brightness uniformity of the image, the emission field and the receiving field need to be corrected separately.

[0003] A common uniformity correction method is based on the assumption that the volume transmit coil (VTC) has a relatively uniform coil sensitivity distribution, and by pre-scanning the same imaging VTC coil image as a reference image, the receiving sensitivity information of the coil to be corrected is obtained, and the uniformity of the corrected image is corrected. The correction method is based on the assumption that the VTC image is relatively uniform, and the correction effect on the low field can meet the actual demand, but in high field, due to the increase of radio frequency and the decrease of wavelength, the dielectric effect of the human body is enhanced, resulting in the decrease of the radio frequency field uniformity of the VTC coil itself, and the VTC image cannot meet the uniformity requirement of the reference image, and the correction effect is poor. Another common method is to extract the coil sensitivity distribution based on image information, which has certain disadvantages and cannot well distinguish contrast and brightness uniformity. While correcting the brightness, the contrast is lost to a certain extent.

[0004] Therefore, the prior art has the following technical problems: the correction effect on the high field strength radio frequency field is poor, and the receiving field and the emission field cannot be determined separately, and the emission field and the receiving field cannot be corrected separately, which has certain limitations. SUMMARY

[0005] The embodiment of the present application provides a method for determining the sensitivity distribution of a magnetic resonance receiving coil, to realize the determination of the emission field map and the sensitivity distribution of the magnetic resonance receiving coil (receiving field map), and improve the correction effect of the radio frequency field in high field strength.

[0006] In a first aspect, an embodiment of the present application provides a method for determining a sensitivity distribution of a magnetic resonance receiving coil, comprising:

[0007] obtaining a reference image, wherein contrast information between at least two tissues corresponding to a target part in the reference image is suppressed;

[0008] determining an initial radio frequency field map corresponding to the target part based on the reference image;

[0009] obtaining a transmit field map of a transmit field in which the target part is located, and determining a sensitivity distribution of a magnetic resonance receiving coil corresponding to the target part based on the initial radio frequency field map and the transmit field map.

[0010] Optionally, the reference image is determined in the following manner:

[0011] acquiring an unweighted image or a weakly weighted image of the target part based on a preset scanning sequence, and taking the unweighted image or the weakly weighted image as the reference image.

[0012] Optionally, the reference image is determined in the following manner:

[0013] adjusting contrast difference between each tissue contained in the target part based on a preset scanning sequence to obtain a contrast difference suppression image of the target part;

[0014] taking the contrast difference suppression image as the reference image.

[0015] Optionally, the determining of the initial radio frequency field map corresponding to the target part based on the reference image comprises:

[0016] extracting low frequency information of the reference image;

[0017] determining the initial radio frequency field map corresponding to the target part based on the low frequency information.

[0018] Optionally, the transmit field map is determined in the following manner:

[0019] acquiring at least two echo maps related to transmit field information based on a preset acquisition sequence;

[0020] determining the transmit field map based on the at least two echo maps related to the transmit field information.

[0021] In a second aspect, an embodiment of the present application provides a method for correcting a magnetic resonance image, comprising:

[0022] obtaining a reference image, wherein tissue structure information corresponding to a target part in the reference image is suppressed;

[0023] determining an initial radio frequency field map corresponding to the target part based on the reference image;

[0024] Obtain the emission field map of the emission field where the target part is located, and determine the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target part based on the initial radio frequency field map and the emission field map;

[0025] The magnetic resonance image to be processed is corrected based on the emission field pattern and the sensitivity distribution of the magnetic resonance receiving coil to obtain the corrected magnetic resonance image.

[0026] Thirdly, embodiments of the present invention also provide a device for determining the sensitivity distribution of a magnetic resonance receiving coil, comprising:

[0027] A reference image acquisition module is used to acquire a reference image, wherein the contrast information between at least two tissues corresponding to the target area in the reference image is suppressed;

[0028] The radio frequency field determination module is used to determine an initial radio frequency field pattern corresponding to the target location based on the reference image.

[0029] The sensitivity distribution determination module is used to acquire the transmission field map of the transmission field where the target part is located, and to determine the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target part based on the initial radio frequency field map and the transmission field map.

[0030] Thirdly, embodiments of the present invention also provide an electronic device, the electronic device comprising:

[0031] One or more processors;

[0032] Storage device for storing one or more programs.

[0033] When the one or more programs are executed by the one or more processors, the one or more processors implement the methods provided in any embodiment of the present invention.

[0034] Fourthly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the method provided in any embodiment of the present invention.

[0035] The embodiments of the above invention have the following advantages or beneficial effects:

[0036] The sensitivity distribution determination method of the magnetic resonance receiving coil in the embodiment of the present application firstly acquires a reference image, wherein the contrast information between at least two kinds of tissues corresponding to the target part in the reference image is suppressed; determines the initial radio frequency field map corresponding to the target part based on the reference image; acquires the transmission field map of the transmission field where the target part is located, and determines the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target part based on the initial radio frequency field map and the transmission field map, thereby realizing the separate determination of the sensitivity distribution of the magnetic resonance receiving coil and the transmission field map of the transmission field under high field strength. Moreover, through the magnetic resonance image correction method provided in the embodiment of the present application, the independent correction of the receiving field and the transmission field can be realized, the repeated correction of the same target part of the detection object can be realized, and the uniformity correction of the magnetic resonance image under high field strength can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present application, the drawings needed in the description of the embodiments are briefly introduced as follows. Obviously, the drawings introduced are only a part of the drawings of the embodiments to be described by the present application, and not all the drawings. Those skilled in the art can also obtain other drawings from these drawings without creating any creative labor.

[0038] Figure 1 The flowchart of the sensitivity distribution determination method of the magnetic resonance receiving coil provided in the embodiment one of the present application;

[0039] Figure 2 The flowchart of the sensitivity distribution determination method of the magnetic resonance receiving coil provided in the embodiment two of the present application;

[0040] Figure 3 The flowchart of the sensitivity distribution determination method of the magnetic resonance receiving coil provided in the embodiment three of the present application;

[0041] Figure 4 The flowchart of the sensitivity distribution determination method of the magnetic resonance receiving coil provided in the embodiment four of the present application;

[0042] Figure 4A The preset acquisition sequence provided in the embodiment four of the present application;

[0043] Figure 5 The flowchart of the magnetic resonance image correction provided in the embodiment five of the present application;

[0044] Figure 5A The reference image, the initial radio frequency field map and the sensitivity distribution map obtained in the embodiment five of the present application;

[0045] Figure 5B The corrected magnetic resonance image provided in the embodiment five of the present application;

[0046] Figure 6 A structural schematic diagram of a sensitivity distribution determination device of a magnetic resonance receiving coil provided in Embodiment Six of the present application;

[0047] Figure 7 A structural schematic diagram of an electronic device provided in Embodiment Seven of the present application. DETAILED DESCRIPTION

[0048] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, but not all the structures.

[0049] Embodiment One

[0050] Before the method for determining the sensitivity distribution of the magnetic resonance receiving coil provided in the embodiments of the present application is described in detail, the application scenarios of the method for determining the sensitivity distribution of the magnetic resonance receiving coil are exemplarily described. For example, in an MR system, a uniformly distributed radio frequency electromagnetic field becomes non-uniform due to the change of the patient acquisition site. The non-uniform distribution of the radio frequency electromagnetic field causes the brightness uniformity of the image acquired by the MR system to decrease, which further affects the doctor's reading and diagnosis of the image, as well as image post-processing analysis such as image segmentation. Moreover, with the increase of the static magnetic field strength, the degree of non-uniformity of the radio frequency electromagnetic field also increases, especially in high field (B0≥3T), the non-uniformity of the radio frequency electromagnetic field is more obvious. The MR system uses the image brightness information received by the local coil, which contains not only the contrast information of different tissue structures weighted as expected, but also the information of the non-uniform distribution of the transmit field and the non-uniform distribution of the receive field. If the uniformity correction of the image is to be realized, the transmit field and the receive field need to be corrected separately. Therefore, the method for determining the sensitivity distribution of the magnetic resonance receiving coil provided in the embodiments of the present application can be applied to the MR system, and is especially suitable for high field MR systems with a main magnetic field strength of 5 Tesla, 7 Tesla, etc. When an image of a certain part of a patient is acquired, the method is used to simultaneously determine the receive field information and the transmit field information of the radio frequency field, so as to correct the acquired image based on the receive field information (the sensitivity distribution of the magnetic resonance receiving coil in the embodiments of the present application) and the transmit field information (the transmit field map of the transmit field in the embodiments of the present application), respectively.

[0051] Figure 1A flowchart of a method for determining sensitivity distribution of a magnetic resonance receiving coil is provided in Embodiment One of the present application. The embodiment can be applied to a case where actual receiving field information of a scan object is determined before a corrected image of the scan object is acquired. The method can be executed by a device for determining sensitivity distribution of a magnetic resonance receiving coil, which can be implemented by hardware and / or software. The method specifically includes the following steps:

[0052] In S110, a reference image is acquired, wherein contrast information between at least two types of tissues in a target part in the reference image is suppressed.

[0053] The target part of the scan object can be a tissue or an organ. For example, the target part can be a large part of the scan object, such as the head, chest, abdomen, neck, limbs, chest, ankle, breast, liver, heart, spleen, kidney, etc. The reference image can be obtained by pre-scanning the target part based on a preset scan sequence. The preset scan sequence can be a sequence for acquiring an initial radio frequency field image, and the sequence can be obtained by setting specific scan parameters in the sequence. In the present application, the contrast information between different tissues / organs of the target part is suppressed to obtain the reference image. In other embodiments, the contrast information between different tissues / organs of the target part can also be suppressed to obtain the reference image, or the proton density information between different tissues / organs of the target part can be suppressed, or the proton density image can not be weighted, or the contrast difference and proton density difference between different tissues can be compensated.

[0054] In the present embodiment, the contrast information of the target part in the reference image is suppressed, which means that the brightness difference between the tissues of the target part in the reference image is suppressed. Specifically, since the contrast signal of the target part in the reference image is suppressed, the tissue structure of the target part in the reference image is weakened, or the tissue structure of the target part in the reference image cannot be reflected. In other words, the reference image can be understood as a non-structure image or a weak-structure image of the target part. For example, the proton density difference between water and fat contained in the target part in the reference image is suppressed.

[0055] In the MR system, due to the difference in proton density of each tissue contained in the target part, each tissue presents different brightness on the image, and the contrast information between different tissues on the image can reflect the tissue structure of each tissue. The brightness information of the image includes the proton density information, the reception field inhomogeneity information and the transmission field inhomogeneity information. Therefore, the application can perform pre-scanning on the target part by the preset scanning sequence to obtain a reference image in which the contrast information between different tissues of the target part is suppressed, so that the brightness information of the reference image only includes the reception field inhomogeneity information and the transmission field inhomogeneity information.

[0056] In other words, the purpose of pre-scanning the target part to obtain the reference image in which the contrast signal between two or more different tissues of the target part is suppressed in the embodiment is to obtain the image of the weakened tissue structure or no tissue structure of the target part, and then to extract the reception field inhomogeneity information from the image of the weakened tissue structure or no tissue structure. In this embodiment, the reference image in which the contrast signal between two or more different tissues of the target part is suppressed can be that the pixel value similarity of the region belonging to the two tissues in the reference image is close to 80% or more, or the boundary region of the two tissues has no obvious gradient.

[0057] Optionally, the reference image can be determined by the following method: acquiring a non-weighted image of the target part based on the preset scanning sequence, and taking the non-weighted image as the reference image.

[0058] In the non-weighted image, the tissue structure information of each tissue of the target part is weakened, so that the contrast signal in the non-weighted image is suppressed. For example, the non-weighted image can be a non-weighted proton density image, a non-weighted T1 image, a non-weighted T2 image, etc. That is, the embodiment can directly obtain the non-weighted image of the target part by the preset scanning sequence, and take the non-weighted image as the reference image.

[0059] Optionally, the non-weighted image or the weakly weighted image can suppress the longitudinal relaxation difference of the tissue in the image acquisition process of the target part, and the TE parameter of the preset scanning sequence can be set to 10-100 ms and the TR can be set to 1-5 ms to reduce or suppress the influence of T1 weighting. Alternatively, the non-weighted image or the weakly weighted image can suppress the transverse relaxation difference of the tissue in the image acquisition process of the target part, and the TE parameter of the preset scanning sequence can be set to 500-1000 ms and the TR can be set to 10-50 ms to reduce or suppress the influence of T2 weighting.

[0060] For example, the preset scan sequence can be a 3D gradient echo sequence. In one embodiment, the preset scan sequence comprises a set sequence and sequence parameters. Optionally, the sequence parameters can include, but are not limited to, a field of view (FOV), a matrix pixel, a flip angle, an echo time, and a repetition time. The matrix pixel can be a matrix size of pixels, i.e., an image resolution.

[0061] In a preferred embodiment, the sequence parameters include a FOV containing the target site, a small matrix pixel, a small flip angle (a small flip angle can make the sequence have a linear response to the flip angle and make the emission field inhomogeneity information in the image be linearly reflected in the image brightness), an in-phase echo time, and a small repetition time. The purpose of setting the sequence parameters is to weaken the contrast information of different tissues of the target site in the T1 and T2 images, to obtain an image with weak or no tissue structure, and to facilitate extraction of the reception field inhomogeneity information therefrom.

[0062] S120, determining a radio frequency field initial map corresponding to the target site based on the reference image.

[0063] The radio frequency field initial map can reflect the radio frequency field inhomogeneity information of the local coil corresponding to the target site. Specifically, the brightness information of the reference image obtained in this embodiment includes a combination of the emission field information and the reception field information corresponding to the target site. Therefore, the combination of the emission field information and the reception field information corresponding to the target site can be obtained from the reference image, i.e., a radio frequency field initial map related to the radio frequency emission field and the radio frequency reception field is obtained.

[0064] In an actual scanning process, the target site is in an imaging scanning region of an MR system, a radio frequency transmission coil performs a radio frequency pulse to generate a radio frequency emission field in the imaging scanning region, and a magnetic resonance reception coil located on the surface of the target site receives a magnetic resonance signal generated by exciting the target site by the radio frequency pulse. Generally, the magnetic resonance reception coil can include an array formed by multiple reception coil units, and the reception coil units at different positions can have different sensitivities due to different distances from the target site. The radio frequency field initial map obtained by the foregoing acquisition can mix an emission field map (the emission field map reflects the response of each position in the imaging scanning region to the radio frequency pulse) and a sensitivity distribution of the magnetic resonance reception coil (the response of the reception coil to the magnetic resonance signal).

[0065] In one embodiment, the reference image can be directly determined as the radio frequency field initial map corresponding to the target site; in another embodiment, low frequency information can also be extracted from the reference image, and an image reconstructed according to the low frequency information is taken as the radio frequency field initial map corresponding to the target site.

[0066] Optionally, the determining the initial radio frequency field map corresponding to the target region based on the reference image comprises: acquiring low frequency information of the reference image; and determining the initial radio frequency field map corresponding to the target region based on the low frequency information.

[0067] In the embodiment, the reference image can be an image without tissue structure or an image with weak tissue structure. When the reference image is the image with weak tissue structure, the reference image comprises the initial radio frequency field map and residual tissue structure information. The residual tissue structure information can be medium-high frequency information in the image, and the initial radio frequency field map can be low frequency information in the image. Therefore, the initial radio frequency field map corresponding to the target region can be obtained by extracting the low frequency information of the reference image or filtering out the medium-high frequency information of the reference image.

[0068] In the embodiment, the low frequency information of the reference image can be acquired by a fast descent method, low-pass filtering, fitting calculation or optimal solution, and the application does not limit the method for acquiring the low frequency information.

[0069] In the embodiment, the initial radio frequency field map corresponding to the target region is determined by acquiring the low frequency information of the reference image, and the method has the advantages of improving the accuracy of the initial radio frequency field map, thereby improving the accuracy of the received field information and further improving the correction effect of the received field.

[0070] S130, acquiring a transmit field map of a transmit field in which the target region is located, and determining a sensitivity distribution of a magnetic resonance receiving coil corresponding to the target region based on the initial radio frequency field map and the transmit field map.

[0071] In the embodiment, the transmit field map of the transmit field can be determined by calculating actual transmit field information of the target region according to a preset acquisition sequence, and taking the actual transmit field information of the target region as the transmit field map of the transmit field. The preset acquisition sequence can be a sequence that is preset and used for scanning and calculating local coil transmit field inhomogeneity information. For example, the preset acquisition sequence can be a B1 mapping sequence, such as a DAM (Double Angle Methods) sequence, an AFI (Actual flip angle imaging) sequence, etc.

[0072] Specifically, the actual transmit field information corresponding to the target region can be calculated by the preset acquisition sequence, that is, the transmit field map of the transmit field is obtained. The actual transmit field information can be transmit field inhomogeneity information of a local coil corresponding to the target region.

[0073] After the actual transmit field information is obtained, the actual receive field information of the target part can be determined according to the radio frequency field initial map and the transmit field map of the transmit field, and the actual receive field information of the target part is taken as the sensitivity distribution of the magnetic resonance receive coil corresponding to the target part. The actual receive field information can be the receive field non-uniformity information of the local coil corresponding to the target part.

[0074] Optionally, after the sensitivity distribution of the magnetic resonance receive coil is determined, the method further includes: obtaining a to-be-processed image of the target part; and correcting the to-be-processed image based on the actual transmit field information and / or the actual receive field information to obtain a target image.

[0075] The to-be-processed image can be a scanning image of the target part, such as a T1 weighted image, a T2 weighted image, a proton density image, and the like. Specifically, after the actual receive field information and the actual transmit field information of the target part are obtained, the actual receive field information or the actual transmit field information can be regarded as correction information of the to-be-processed image.

[0076] It should be noted that the correction process of the to-be-processed image can be that the to-be-processed image is corrected based on the actual transmit field information and the actual receive field information in sequence respectively to obtain a target image whose receive field and transmit field are both corrected, or the to-be-processed image is corrected based on only the actual transmit field information or the actual receive field information. When the to-be-processed image is corrected based on the actual transmit field information and the actual receive field information in sequence respectively, the order of correction can be that the transmit field correction is performed first, or the receive field correction is performed first, which is not limited in the present application.

[0077] In an embodiment, the actual receive field information can be determined by adjusting parameters of a magnetic resonance sequence to obtain an image without or with weakened tissue structure information (contrast information is suppressed), that is, a reference image, so that the brightness information on the reference image is only transmit field non-uniformity information and receive field non-uniformity information, and then the actual transmit field information is obtained by a measurement method.

[0078] Of course, in another embodiment, it can also be directly obtained by parameter adjustment of a magnetic resonance sequence, such as an unweighted proton density image, an unweighted T1 image, an unweighted T2 image, etc., wherein the tissue structure information (contrast information) in the unweighted scan image is weakened, the low frequency component in the brightness information on the image is the transmit field inhomogeneity signal and the receive field inhomogeneity information, the low frequency information in the image is obtained through the image processing method, and the actual transmit field information is obtained through the measurement means, so as to determine the actual receive field information. The parameters (parameters to be adjusted) can be FOV, matrix pixel, flip angle, echo time, repetition time, etc.

[0079] The technical scheme of the embodiment obtains a reference image of the target part with suppressed contrast information through a pre-set scan sequence, determines the radio frequency field initial image corresponding to the target part according to the reference image, and obtains the actual transmit field information corresponding to the target part based on the pre-set acquisition sequence and takes the actual transmit field information as the transmit field map of the transmit field, and then determines the actual receive field information according to the radio frequency field initial image and the transmit field map, and takes the determined actual receive field information as the sensitivity distribution of the magnetic resonance receiving coil, thereby realizing the determination of the receive field information of the radio frequency field in the high-field magnetic resonance system.

[0080] Embodiment two

[0081] Figure 2 The flowchart of the sensitivity distribution determination method of the magnetic resonance receiving coil provided in the embodiment two of the application, based on the above-mentioned embodiments, the pre-scanning of the target part based on the pre-set scan sequence to obtain the reference image, including: adjusting the contrast difference between each tissue contained in the target part based on the pre-set scan sequence to obtain the contrast difference suppression image of the target part; taking the contrast difference suppression image as the reference image.

[0082] Wherein the explanations of the same or corresponding terms as those in the above-mentioned embodiments are not repeated here. See Figure 2 The sensitivity distribution determination method of the magnetic resonance receiving coil provided in the embodiment includes the following steps:

[0083] S210, adjusting the contrast difference between each tissue contained in the target part based on the pre-set scan sequence to obtain the contrast difference suppression image of the different tissues in the target part.

[0084] Wherein, the pre-set scan sequence includes the set sequence and the sequence parameters. Optionally, the sequence parameters include but are not limited to the field of view (Field of View, FOV), the matrix pixel, the flip angle, the echo time and the repetition time. The set sequence can be a 3D gradient echo sequence.

[0085] Specifically, because the proton density of each tissue in the target region is different, the gray value of each tissue contained in the target region is also different when presented on the image. For example, the proton density of water is different from that of fat. When presented on the image, water is a darker area, and fat is a brighter area.

[0086] The embodiment can adjust the contrast difference between each tissue contained in the target region through the preset scanning sequence. Optionally, the adjusting the contrast difference between each tissue contained in the target region based on the preset scanning sequence comprises: reducing the contrast difference level between each tissue contained in the target region based on the preset scanning sequence. Specifically, by reducing the contrast difference level, the brightness level between the bright area and the dark area is reduced, and the light and dark difference level of each tissue presented on the image is reduced, so that the light and dark difference between the bright area and the dark area is minimized, and an image in which the contrast information of different tissues of the target region is suppressed is obtained.

[0087] Optionally, the adjusting the contrast difference between each tissue contained in the target region based on the preset scanning sequence comprises: adjusting the brightness between each tissue contained in the target region based on the preset scanning sequence to reduce the brightness difference between each tissue. Specifically, the brightness of the bright tissue can be reduced, and the brightness of the dark tissue can be increased to reduce the brightness difference between the bright area and the dark area through the preset scanning sequence, so as to obtain an image in which the contrast information of different tissues of the target region is suppressed.

[0088] Optionally, the adjusting the brightness between each tissue contained in the target region comprises: determining the brightness mean value of each tissue contained in the target region; and adjusting the area brightness of each tissue contained in the target region based on the brightness mean value.

[0089] The brightness mean value can be the mean value of the overall brightness of the target region. Specifically, the optional embodiment can adjust the brightness of each tissue contained in the target region based on the brightness mean value, so that the brightness of each tissue tends to the brightness mean value, thereby reducing the contrast difference between each tissue, and thereby obtaining a reference image containing only the radio frequency field inhomogeneity information.

[0090] In the optional embodiment, the increasing or reducing the proton density of each tissue contained in the target region based on the proton density mean value comprises: reducing the brightness of the tissue with brightness higher than the brightness mean value, and increasing the brightness of the tissue with brightness lower than the brightness mean value; or adjusting the brightness of each tissue contained in the target region in a hedging / mutual offsetting manner based on the brightness mean value.

[0091] Specifically, adjusting the brightness of each tissue contained in the target region in a hedging manner can be understood as mutually compensating the brightness of each tissue, for example, using the tissue with higher brightness to compensate the tissue with lower brightness, so that the brightness of each tissue after mutual compensation is equal to or close to the average brightness, thereby obtaining a contrast difference suppression image.

[0092] Of course, the embodiment can also adjust the contrast difference level between each tissue contained in the target region while adjusting the brightness of each tissue contained in the target region, to further weaken the structure of each tissue of the target region presented in the image.

[0093] S220, taking the contrast difference suppression image as a reference image, determining the radio frequency field initial image corresponding to the target region based on the reference image.

[0094] Among them, the tissue structure information corresponding to the target region in the reference image is suppressed.

[0095] It should be noted that the step of adjusting the contrast difference between each tissue contained in the target region based on the preset scan sequence can be performed during the scanning process of the preset scan sequence, and the scanning result is directly determined as the reference image after the scanning is completed.

[0096] S230, according to the preset acquisition sequence, obtaining the emission field map of the emission field where the target region is located, and determining the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target region based on the radio frequency field initial image and the emission field map.

[0097] The technical scheme of the embodiment adjusts the contrast difference between each tissue contained in the target region based on the preset scan sequence, obtains a reference image with suppressed tissue structure information, so that the reference image only contains the radio frequency field initial image, and then the determination of the receiving field information is realized. Moreover, through the receiving field determination method provided by the embodiment of the application, independent correction of the receiving field and the emission field can be realized, so as to improve the correction effect of the radio frequency field.

[0098] Embodiment three

[0099] Figure 3 A flowchart of a sensitivity distribution determination method of a magnetic resonance receiving coil provided by the third embodiment of the application, the embodiment is based on the above-mentioned embodiments, and optionally, the target region is pre-scanned based on the preset scan sequence, including: determining the preset scan sequence corresponding to the target region based on the pre-set sequence information table, wherein the sequence information table includes each part and the scan sequence corresponding to each part; and pre-scanning the target region based on the preset scan sequence.

[0100] Among them, the explanation of the same or corresponding terms as in the above-mentioned embodiments will not be repeated here. See Figure 3The embodiment provided in the method for determining the sensitivity distribution of a magnetic resonance receiving coil comprises the following steps:

[0101] In S310, a preset scan sequence corresponding to the target part is determined based on a preset sequence information table, wherein the sequence information table comprises parts and scan sequences corresponding to the parts.

[0102] In the embodiment, the tissue size of each part is not the same, and the anti-electric effect of the radio frequency electromagnetic wave generated by each part is also not the same, so the radio frequency field inhomogeneity information corresponding to each part is different.

[0103] Therefore, for the same target part, the actual transmitting field information and the actual receiving field information obtained by one measurement and solving can be used to perform repeated correction of the target part. For different target parts, the determination of the actual receiving field information needs to be repeated for each target part. That is, the actual receiving field information (the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target part) and the actual transmitting field information (the transmitting field map of the transmitting field where the target part is located) of each target part need to be determined separately. When the actual receiving field information of each target part is determined separately, the preset scan sequences corresponding to each target part can also be different. Specifically, the sequence parameters of the preset scan sequences of each target part can be different.

[0104] Therefore, the embodiment can preset a sequence information table, and the sequence information table stores parts and scan sequences corresponding to the parts, such as liver-scan sequence A, breast-scan sequence B, and the like. When the actual receiving field information of a target part needs to be determined, the preset scan sequence corresponding to the target part can be queried from the sequence information table to obtain a reference image based on the preset scan sequence.

[0105] Of course, the sequence information table can also comprise tissue sizes and scan sequences corresponding to the tissue sizes. Correspondingly, the pre-scanning of the target part based on the preset scan sequence comprises determining the tissue size of the target part and determining the preset scan sequence corresponding to the tissue size of the target part based on the preset sequence information table.

[0106] In S320, the target part is pre-scanned based on the preset scan sequence to obtain a reference image, wherein the tissue structure information corresponding to the target part in the reference image is suppressed.

[0107] In S330, a radio frequency field initial map corresponding to the target part is determined based on the reference image, and a transmitting field map of a transmitting field where the target part is located is obtained according to a preset acquisition sequence.

[0108] In S340, the sensitivity distribution of a magnetic resonance receiving coil corresponding to the target part is determined based on the radio frequency field initial map and the transmitting field map.

[0109] The technical scheme of the embodiment determines the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target part by querying the preset scanning sequence corresponding to the target part based on the preset sequence information table, without individually formulating the corresponding scanning sequence for each scanning object, and only one query can obtain the scanning sequence of the scanning object, thereby improving the efficiency of determining the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target part, and further improving the correction efficiency of the collected image of the target part.

[0110] Embodiment four

[0111] Figure 4 A flowchart of a magnetic resonance receiving coil sensitivity distribution determination method provided by the fourth embodiment of the application, based on the above-mentioned embodiments, the actual transmit field information of the target part is calculated according to the preset acquisition sequence, which includes: acquiring at least two echo images related to the transmit field information based on the preset acquisition sequence; and calculating the actual transmit field information of the target part based on the at least two echo images related to the transmit field information.

[0112] Wherein the explanations of the same or corresponding terms in the above-mentioned embodiments are not repeated here. See Figure 4 The magnetic resonance receiving coil sensitivity distribution determination method provided by the embodiment includes the following steps:

[0113] S410, pre-scanning the target part based on the preset scanning sequence to obtain a reference image, and determining the radio frequency field initial image corresponding to the target part based on the reference image.

[0114] Wherein, the tissue structure information corresponding to the target part in the reference image is suppressed.

[0115] S420, acquiring at least two echo images related to the transmit field information based on the preset acquisition sequence.

[0116] Wherein, the preset acquisition sequence can be a B1 mapping sequence, such as a DAM sequence, an AFI sequence, etc. Specifically, the target part is scanned by the preset acquisition sequence to obtain at least two echo images related to the transmit field information.

[0117] S430, obtaining the transmit field map of the transmit field where the target part is located based on the at least two echo images related to the transmit field information.

[0118] As Figure 4AAs shown, the preset acquisition sequence is an AFI (actual flip-angle imaging) sequence, which includes a first RF pulse and a second RF pulse with a flip angle of a, and the repetition time of the first RF pulse is TR1 and the repetition time of the second RF pulse is TR2. The signal intensity acquired after the excitation of the first RF pulse is S1, and the signal intensity acquired after the excitation of the second RF pulse is S2. The signals acquired twice are respectively reconstructed to obtain two echo images related to the transmit field information. The signal intensity acquired after the excitation of the RF pulse is expressed as:

[0119]

[0120]

[0121]

[0122]

[0123] wherein M z1 represents the transverse magnetization vector of the target site after the excitation of the first RF pulse; M z2 represents the transverse magnetization vector of the target site after the excitation of the second RF pulse; M0 represents the longitudinal magnetization intensity vector; TE represents the echo time; T1, T2 and are the relaxation constants. Exemplarily, the actual transmit field information of the target site can be calculated based on an image related to the transmit field factor obtained by dividing at least two echo images related to the transmit field information.

[0124] In this embodiment, the two echo images related to the transmit field information are divided to determine a proportion factor r for each position in the transmit field, which is a function of the flip angle, so that the transmit pulse response felt by each position can be determined according to the proportion factor, i.e., the factor (the size of the flip angle) of the transmit pulse for each position. The size of the flip angle obtained according to the two signal intensities of each position is the transmit field map of the transmit field in which the target site is located.

[0125]

[0126]

[0127]

[0128] In the above formula, n is a constant, specifically the ratio of the repetition time of the first RF pulse to the repetition time of the second RF pulse.

[0129] S440, determine the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target site based on the radio frequency field initial map and the transmit field map.

[0130] The technical scheme of the embodiment acquires actual transmit field information by scanning at least two echo maps related to transmit field information, takes the acquired actual transmit field information as a transmit field map of a transmit field where the target site is located, and thus determines the actual transmit field information (determines the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target site) and accurately determines the actual receive field information.

[0131] In another implementation, at least two echo maps related to transmit field information can also be acquired based on a preset acquisition sequence, and the actual transmit field information of the target site is calculated based on the at least two echo maps related to transmit field information. The transmit field phase image can be an image reflecting the phase change of the transmit field. That is, the spatial distribution of the actual transmit field is calculated by detecting the signal phase change caused by the transmit field.

[0132] Embodiment five

[0133] Figure 5 A flowchart of a magnetic resonance image correction method is provided in the fifth embodiment of the present application. First, a radio frequency field initial map containing only radio frequency transmit field and receive field distribution information is acquired, and then the transmit field information is obtained by a measurement method. Based on the transmit field information, the receive field distribution can be roughly estimated. This method can be used to evaluate the receive field on a high field and independently correct the receive field inhomogeneity of the image, and further realize the complete correction of the radio frequency field inhomogeneity on a high field. The method mainly includes:

[0134] S510, acquire a reference image, wherein the tissue structure information corresponding to the target site in the reference image is suppressed.

[0135] The reference image is acquired by performing a pre-scan sequence on the target site. The parameters of the pre-scan sequence are optimized to weaken the contrast between different tissues and / or obtain proton density information in the image reconstructed from the magnetic resonance signals acquired by the target site. In this embodiment, the pre-scan sequence uses a 3D gradient echo sequence, the imaging matrix is selected to be 32x32 pixels, and the flip angle is set to be in the range of 1°-15°, so that the response of the pre-scan sequence to the flip angle is linear, and the transmit field inhomogeneity information in the reference image can be linearly reflected in the image brightness; at the same time, the TE of water and fat is set to be in phase, and the TR is much smaller than the relaxation constants T1 and T2, so that the T1 and T2 weighted contrast information between different tissues is weakened.

[0136] S520. Determine the initial radio frequency field map corresponding to the target part based on the reference image. In this embodiment, low-frequency information is extracted from the reference image, and the image reconstructed based on the low-frequency information is used as the initial radio frequency field map corresponding to the target part.

[0137] S530. Obtain the transmission field map of the transmission field where the target part is located, and determine the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target part based on the initial radio frequency field map and the transmission field map.

[0138] The target body part is selected as the head, such as Figure 5A As shown, the left image is a reference image obtained in an embodiment of this application. In this reference image, the structural information of gray matter and white matter is suppressed, and their contrast information is partially suppressed. The middle image is an initial radio frequency field image obtained in an embodiment of this application. This initial radio frequency field image has good homogenization and almost no organizational structure information. The right image is a transmission field image obtained in an embodiment of this application. This transmission field image also has good homogenization. In this embodiment, after homogenizing the transmission field image, differential processing is performed between it and the initial radio frequency field image to obtain the sensitivity distribution map of the magnetic resonance receiving coil.

[0139] S540: Based on the transmission field map and the sensitivity distribution of the magnetic resonance receiving coil, the magnetic resonance image to be processed is corrected to obtain the corrected magnetic resonance image.

[0140] like Figure 5B The image shown is a schematic diagram of the magnetic resonance image processed according to an embodiment of this application. The left image is the magnetic resonance image to be processed; the lower left corner is affected by the emission field, resulting in higher intensity, while other areas show lower signal intensity, indicating significant non-uniformity. The middle image is the corrected magnetic resonance image obtained using the method of this application, showing a significant improvement in uniformity. In contrast, the right image is an image corrected only by the emission field; the central area of ​​this image still shows prominent brightness, indicating significant non-uniformity.

[0141] Example 6

[0142] Figure 6 This is a schematic diagram of a sensitivity distribution determination device for a magnetic resonance receiving coil provided in Embodiment 6 of the present invention. This embodiment can be applied to the situation where the actual receiving field information of the scanning object is determined before the acquired image of the scanning object is corrected. The device specifically includes: a reference image acquisition module 610, a radio frequency field determination module 620, and a sensitivity distribution determination module 630.

[0143] The reference image acquisition module 610 is configured to acquire a reference image, wherein contrast information between at least two types of tissues corresponding to a target part in the reference image is suppressed. In this embodiment, the reference image acquisition module 610 can perform pre-scanning on the target part based on a preset scanning sequence to obtain the reference image.

[0144] The radio frequency field determination module 620 is configured to determine an initial radio frequency field map of the target part based on the reference image.

[0145] The sensitivity distribution determination module 630 is configured to acquire a transmit field map of a transmit field in which the target part is located, and determine a sensitivity distribution of a magnetic resonance receiving coil corresponding to the target part based on the initial radio frequency field map and the transmit field map. In this embodiment, the sensitivity distribution determination module 630 can be configured to calculate actual transmit field information of the target part as the transmit field map according to a preset acquisition sequence, and determine actual receiving field information of the target part based on the initial radio frequency field map and the transmit field map, wherein the actual receiving field information is the sensitivity distribution of the magnetic resonance receiving coil.

[0146] In this embodiment, the reference image acquisition module is configured to obtain the reference image in which the contrast information between different tissues of the target part is suppressed, the radio frequency field determination module is configured to determine the initial radio frequency field map of the target part, and the sensitivity distribution determination module is configured to obtain the actual transmit field information of the target part, and then determine the actual receiving field information, thereby determining the receiving field information of the radio frequency field, and then realizing independent correction of the receiving field and the transmit field, so as to improve the correction effect of the radio frequency field.

[0147] Optionally, the reference image acquisition module 610 includes a first scanning unit configured to acquire an unweighted image of the target part based on a preset scanning sequence, and take the unweighted image as the reference image.

[0148] Optionally, the reference image acquisition module 610 includes a second scanning unit configured to adjust contrast differences between tissues contained in the target part based on a preset scanning sequence to obtain a different tissue contrast difference suppression image of the target part, and take the different tissue contrast difference suppression image of the target part as the reference image.

[0149] Optionally, the radio frequency field determination module 620 is specifically configured to acquire low-frequency information of the reference image, and determine the initial radio frequency field map of the target part based on the low-frequency information.

[0150] Optionally, the reference image acquisition module 610 comprises a scan sequence determination unit and a scanning unit, wherein the scan sequence determination unit is configured to determine a preset scan sequence corresponding to the target part based on a preset sequence information table, wherein the sequence information table comprises parts and scan sequences corresponding to the parts; and the scanning unit is configured to perform pre-scanning on the target part based on the preset scan sequence.

[0151] Optionally, the sensitivity distribution determination module 630 comprises a transmit field determination unit and a receive field determination unit, wherein the transmit field determination unit is configured to calculate actual transmit field information of the target part according to a preset acquisition sequence, and take the calculated actual transmit field information as a transmit field map of a transmit field where the target part is located; and the receive field determination unit is configured to determine actual receive field information of the target part based on the radio frequency field initial map and the transmit field map, that is, determine the sensitivity distribution of the magnetic resonance receive coil corresponding to the target part.

[0152] Optionally, the transmit field determination unit is specifically configured to acquire at least two echo maps related to transmit field information based on a preset acquisition sequence; and calculate actual transmit field information of the target part based on the at least two echo maps related to transmit field information.

[0153] Optionally, the sensitivity distribution determination apparatus of the magnetic resonance receive coil further comprises a correction module, and the correction module is configured to acquire a to-be-processed image of the target part; and perform correction processing on the to-be-processed image based on the actual transmit field information and / or the actual receive field information to obtain a target image.

[0154] The sensitivity distribution determination apparatus of the magnetic resonance receive coil provided in the embodiment of the present application can perform the sensitivity distribution determination method of the magnetic resonance receive coil provided in any embodiment of the present application, and has the corresponding function modules and beneficial effects of performing the method.

[0155] It should be noted that the units and modules included in the above system are only divided according to the function logic, and are not limited to the above division, as long as the corresponding functions can be realized; in addition, the specific names of each functional unit are only for convenient mutual distinction, and do not limit the protection scope of the embodiment of the present application.

[0156] Embodiment seven

[0157] Figure 7 is a structural schematic diagram of an electronic device provided in the embodiment seven of the present application. Figure 7 A block diagram of an exemplary electronic device 12 suitable for use in implementing embodiments of the present application is shown. Figure 7The electronic device 12 shown is merely one example of an electronic device that can benefit from the present embodiments and should not be taken as limiting the scope of the present embodiments with respect to the functioning and use of the present embodiments. The device 12 is typically a computing device that is configured to determine receive field information and transmit field information.

[0158] As shown Figure 7 The electronic device 12 is, in one embodiment, in the form of a general- purpose computing device. The components of the electronic device 12 can include, but are not limited to, one or more processors or processing units 16, a memory 28, and a bus 18 that couples various components including the memory 28 and the processing unit 16.

[0159] The bus 18 represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration bus, a processor or local bus using any of a variety of bus architectures. By way of example, these architectures include Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MCA) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.

[0160] The electronic device 12 typically includes a variety of computer readable media. These media can be any available media that is located either in the

[0161] The memory 28 can include computer storage media in the form of volatile and / or nonvolatile memory, such as a random access memory (RAM) 30 and / or a cache memory 32. The electronic device 12 can further include other removable / non-removable, volatile / non-volatile computer storage media. By way of example only, a storage device 34 can be used for reading from and writing to non-removable, nonvolatile magnetic media (e.g., a "hard drive"). Figure 6 not shown, is generally referred to as a "hard disk drive" or "hard drive". Although Figure 6A disk drive, a floppy disk drive, a CD-ROM drive, a DVD-ROM drive, or other removable media drive, can be provided for reading from and writing to a removable n onvolatile magnetic disk (e.g., a "floppy disk"), and to a removable nonvolatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical media). In such instances, each drive can be connected to the bus 18 by one or more data media interfaces. The memory 28 can include at least one program product 40 having a set of program modules 42 configured to carry out the functions of embodiments of the application. The program product 40, can be stored on, for example, the memory 28, such as shown, and each of the program modules 42 or some combination thereof, can include an operating system 44, one or more applications 46, other program modules 48, and program data 50. Each of the operating system 44, the one or more applications 46, and the other program modules 48 can be configured to carry out a particular function or group of functions, and can be implemented in software or firmware, in combination with the hardware of the electronic device 12. It should be appreciated that the program modules 42 can also include computer code that, when executed, enables the electronic device 12 to create the various user interfaces described herein as well as performs a variety of functions attributed to such interfaces as described herein.

[0162] The electronic device 12 can also communicate with one or more external devices 14 such as a keyboard or a mouse, camera, etc., and a display, as well as with one or more devices that enable a user to interact with the electronic device 12 and / or any devices (e.g., network cards, modems, etc.) that enable the electronic device 12 to communicate with one or more other computing devices. Such communication can occur via an input / output (I / O) interface 22. Still yet, the electronic device 12 can communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or the Internet) through a network adapter 20. As depicted, the network adapter 20 communicates with the other components of the electronic device 12 via the bus 18. It should be appreciated that the electronic device 12 can be a part of a larger system, which includes a plurality of devices, such as the electronic device 12, that are configured to communicate with one another via the network adapter 20. It should be appreciated that the network adapter 20 and / or the one or more external devices 14 can be internally disposed with the electronic device 12, external to the electronic device 12, and / or a combination thereof.

[0163] The processor 16, by running the program stored in the memory 28, performs various functional applications and data processing, such as implementing the method for determining the sensitivity distribution of the magnetic resonance receiving coil provided in the above embodiments of the present application, including: acquiring a reference image, wherein the contrast information between at least two tissues corresponding to a target part in the reference image is suppressed; determining a radio frequency field initial map corresponding to the target part based on the reference image; acquiring a transmit field map of a transmit field in which the target part is located, and determining the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target part based on the radio frequency field initial map and the transmit field map.

[0164] The processor 16, by running the program stored in the memory 28, also implements the magnetic resonance image correction function: acquiring a reference image, wherein the tissue structure information corresponding to a target part in the reference image is suppressed; determining a radio frequency field initial map corresponding to the target part based on the reference image; acquiring a transmit field map of a transmit field in which the target part is located, and determining the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target part based on the radio frequency field initial map and the transmit field map; correcting a to-be-processed magnetic resonance image based on the transmit field map and the sensitivity distribution of the magnetic resonance receiving coil, and acquiring a corrected magnetic resonance image.

[0165] Of course, those skilled in the art can understand that the processor can also implement the technical solutions of the method for determining the sensitivity distribution of the magnetic resonance receiving coil and the method for correcting the magnetic resonance image provided in any of the embodiments of the present application.

[0166] Embodiment eight

[0167] The embodiment eight of the present application also provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the method for determining the sensitivity distribution of the magnetic resonance receiving coil provided in any of the embodiments of the present application, and the method includes: acquiring a reference image, wherein the contrast information between at least two tissues corresponding to a target part in the reference image is suppressed; determining a radio frequency field initial map corresponding to the target part based on the reference image; acquiring a transmit field map of a transmit field in which the target part is located, and determining the sensitivity distribution of the magnetic resonance receiving coil corresponding to the target part based on the radio frequency field initial map and the transmit field map.

[0168] Alternatively, the program is executed by the processor to implement the steps of the method for correcting a magnetic resonance image according to any of the embodiments of the present application: obtaining a reference image, wherein the tissue structure information corresponding to a target part in the reference image is suppressed; determining an initial radio frequency field map corresponding to the target part based on the reference image; obtaining a transmit field map of a transmit field in which the target part is located, and determining a sensitivity distribution of a magnetic resonance receiving coil corresponding to the target part based on the initial radio frequency field map and the transmit field map; and correcting a to-be-processed magnetic resonance image based on the transmit field map and the sensitivity distribution of the magnetic resonance receiving coil, to obtain a corrected magnetic resonance image.

[0169] The computer storage medium of the embodiments of the present application can adopt any combination of one or more computer readable media. The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium may, for example, be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination thereof. More specific examples (non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus or device.

[0170] The computer readable signal medium can include a data signal propagated in a baseband or as a part of a carrier wave, in which a computer readable program code is borne. Such a propagated data signal can take on many forms, including but not limited to electro-magnetic, optical, or any suitable combination thereof. The computer readable signal medium can also be any computer readable medium that is not a computer readable storage medium and that can be used to carry or store a program for use by or in connection with an instruction execution system, apparatus or device.

[0171] The program code contained on the computer readable medium can be transmitted using any suitable medium, including but not limited to wireless, wire line, optical cable, RF, etc., or any suitable combination thereof.

[0172] Computer program code for carrying out operations of embodiments of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0173] It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the application. The word "comprising" does not exclude the presence of elements or steps other than those listed in a claim. In addition, the word "comprising" itself does not exclude a process of optional replacement of one element by another element or the interchanging of elements in a claim. The word "comprising" has been used throughout the description in a broad sense and is not used in a restrictive sense. The word "comprising" is to be interpreted synonymously with the words "including", "containing" or "comprising". The word "comprising" has been used throughout the description in a broad sense and is not used in a restrictive sense. The word "comprising" is to be interpreted synonymously with the words "including", "containing" or "comprising". The word "comprising" has been used throughout the description in a broad sense and is not used in a restrictive sense. The word "comprising" is to be interpreted synonymously with the words "including", "containing" or "comprising". The word "comprising" has been used throughout the description in a broad sense and is not used in a restrictive sense. The word "comprising" is to be interpreted synonymously with the words "including", "containing" or "comprising". The word "comprising" has been used throughout the description in a broad sense and is not used in a restrictive sense. The word "comprising" is to be interpreted synonymously with the words "including", "containing" or "comprising". The word "comprising" has been used throughout the description in a broad sense and is not used in a restrictive sense. The word "comprising" is to be interpreted synonymously with the words "including", "containing" or "comprising". The word "comprising" has been used throughout the description in a broad sense and is not used in a restrictive sense. The word "comprising" is to be interpreted synonymously with the words "including", "containing" or "comprising". The word "comprising" has been used throughout the description in a broad sense and is not used in a restrictive sense. The word "comprising" is to be interpreted synonymously with the words "including", "containing" or "comprising". The word "comprising" has

Claims

1. A method of determining a sensitivity profile of a magnetic resonance receiving coil, characterized by, The method comprises the following steps: obtaining a reference image, wherein the reference image is obtained by pre-scanning a target part based on a preset scanning sequence, and a sequence of images in which contrast information between different tissues / organs of the target part is suppressed can be obtained by setting scanning parameters in the preset scanning sequence, and the sequence of images is taken as the reference image; determining an initial radio frequency field image corresponding to the target part based on the reference image; obtaining actual transmission field information corresponding to the target part as a transmission field map of the transmission field based on a preset acquisition sequence, and determining a sensitivity distribution of a magnetic resonance receiving coil corresponding to the target part based on the initial radio frequency field image and the transmission field map.

2. The method of claim 1, wherein, The reference image is determined in the following manner: acquiring a non-weighted image or a weak-weighted image of the target part based on a preset scanning sequence, and taking the non-weighted image or the weak-weighted image as the reference image.

3. The method of claim 1, wherein, The reference image is determined in the following manner: adjusting contrast difference between tissues contained in the target part based on a preset scanning sequence to obtain a contrast difference suppression image of the target part; taking the contrast difference suppression image as the reference image.

4. The method of claim 1, wherein, The method comprises the following steps: extracting low-frequency information of the reference image; determining the initial radio frequency field image corresponding to the target part based on the low-frequency information.

5. The method of claim 1, wherein, The transmission field map is determined in the following manner: acquiring at least two echo maps related to transmission field information based on a preset acquisition sequence; determining the transmission field map based on the at least two echo maps related to the transmission field information.

6. A method of magnetic resonance image correction, characterized by, The method comprises the following steps: obtaining a reference image, wherein the reference image is obtained by pre-scanning a target part based on a preset scanning sequence, and a sequence of images in which contrast information between different tissues / organs of the target part is suppressed can be obtained by setting scanning parameters in the preset scanning sequence, and the sequence of images is taken as the reference image; determining an initial radio frequency field image corresponding to the target part based on the reference image; obtaining actual transmission field information corresponding to the target part as a transmission field map of the transmission field based on a preset acquisition sequence, and determining a sensitivity distribution of a magnetic resonance receiving coil corresponding to the target part based on the initial radio frequency field image and the transmission field map; correcting a to-be-processed magnetic resonance image based on the transmission field map and the sensitivity distribution of the magnetic resonance receiving coil to obtain a corrected magnetic resonance image.

7. A device for determining a sensitivity profile of a magnetic resonance receiving coil, characterized by The method comprises the following steps: a reference image acquisition module is configured to obtain a reference image, wherein the reference image is obtained by pre-scanning a target part based on a preset scanning sequence, and a sequence of images in which contrast information between different tissues / organs of the target part is suppressed can be obtained by setting scanning parameters in the preset scanning sequence, and the sequence of images is taken as the reference image; a radio frequency field determination module is configured to determine an initial radio frequency field image corresponding to the target part based on the reference image; The sensitivity distribution determination module is configured to obtain actual emission field information corresponding to the target part based on a preset acquisition sequence and take the actual emission field information as an emission field map, and determine a sensitivity distribution of a magnetic resonance receiving coil corresponding to the target part based on the radio frequency field initial map and the emission field map.

8. An electronic device, comprising: The electronic device includes: one or more processors; a memory device for storing one or more programs, when the one or more programs are executed by the one or more processors, the one or more processors implement the method as claimed in any one of claims 1-6.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the method as claimed in any one of claims 1-6.

Images