A method, system and array module for compensating magnetic resonance static magnetic field inhomogeneity

Abstract

The present application relates to a method, system and array module for compensating the inhomogeneity of the static magnetic field in magnetic resonance, belonging to the field of magnetic resonance. The method includes obtaining the current static magnetic field information of the current device; searching for the display difference and the difference position from the preset display database according to the current static magnetic field information; adjusting the initial position of the preset compensation coil according to the difference position; and adjusting the initial distribution density of the preset compensation coil according to the display difference. The present application has the effects of improving the array scale and spatial distribution density to increase the maximum spatial order achievable for field homogenization. Radiofrequency electromagnetic waves cannot generate effective induced current in the wire loop of the field homogenization coil, so it is well isolated from the radiofrequency coil for magnetic resonance imaging, minimizing interference with each other, and improving the field homogenization freedom for convenient adjustment.

Description

Technical Field

[0001] The present application relates to the field of magnetic resonance, and in particular, to a method, a system, and an array module for compensating the inhomogeneity of a static magnetic field in magnetic resonance. Background Art

[0002] Magnetic resonance refers to the phenomenon of spin magnetic resonance.

[0003] In related technologies, the traditional method for compensating the inhomogeneity of a static magnetic field in magnetic resonance uses the basis of shimming based on spherical harmonic decomposition. Multiple shimming coils respectively generate static magnetic fields corresponding to different spatial orders of spherical harmonic decomposition. By driving multiple shimming coils with different spatial orders to generate static magnetic fields with different degrees of spatial variation, the inhomogeneity of various static magnetic fields is compensated.

[0004] Regarding the above related technologies, the inventor believes that when winding high-order shimming coils, it is necessary to accurately control the overall parameters, and the overall difficulty is high during the winding process. Moreover, the manufacturing bottleneck of high-order shimming coils limits the total number of shimming coils and the shimming freedom, and there is still room for improvement. Summary of the Invention

[0005] In order to increase the array scale and spatial distribution density to improve the maximum spatial order that can be achieved in shimming. Since radio frequency electromagnetic waves cannot generate effective induced currents in the wire loops of shimming coils, they are well isolated from the radio frequency coils used in magnetic resonance imaging, minimizing interference with each other, facilitating adjustment of shimming freedom, the present application provides a method, a system, and an array module for compensating the inhomogeneity of a static magnetic field in magnetic resonance.

[0006] In a first aspect, the present application provides a method for compensating the inhomogeneity of a static magnetic field in magnetic resonance, adopting the following technical solution:

[0007] A method for compensating the inhomogeneity of a static magnetic field in magnetic resonance includes:

[0008] Obtaining the current static magnetic field information of the current device;

[0009] Searching for the display difference and the difference position from the preset display database according to the current static magnetic field information;

[0010] Adjusting the initial position of the preset compensation coil according to the difference position;

[0011] Adjusting the initial distribution density of the preset compensation coil according to the display difference.

[0012] By adopting the above technical solutions, the current static magnetic field information is acquired, so as to obtain the display difference and the difference position, to judge the unclear display areas and positions, and by adjusting the position and distribution density of the compensation coils, the array scale and spatial distribution density are improved to increase the maximum spatial order that can be achieved for field uniformity. Radio frequency electromagnetic waves cannot generate effective induced current in the wire loops of the field uniformity coils, so they are well isolated from the radio frequency coils for magnetic resonance imaging, minimizing interference with each other and facilitating the adjustment of the field uniformity freedom.

[0013] Optionally, the method for adjusting the position of the compensation coil includes:

[0014] Adjust the position of the compensation coil according to the difference of the difference position;

[0015] If the difference position is 0, no adjustment is made;

[0016] If the difference position is not 0, find the adjustment point from the preset position distribution database according to the difference position;

[0017] Add a compensation coil to the adjustment point according to the adjustment point and the current magnetic field range information preset for the current compensation coil until the difference position is 0.

[0018] By adopting the above technical solutions, when adjusting the position of the compensation coil, calculate the position difference to judge whether to adjust. When the difference is not 0, it means there is a problem with the position. Therefore, increase or decrease the position of the compensation coil according to the position distribution situation to meet the detection requirements.

[0019] Optionally, judge the repeated coverage situation of the current magnetic field range information of the compensation coil to update the position of the adjustment point. The method for updating the position of the adjustment point includes:

[0020] Judge whether there is an intersection in the current magnetic field range information between adjacent compensation coils;

[0021] If there is an intersection, adjust the current compensation coil to move towards the adjustment point until the current magnetic field range information between adjacent compensation coils is tangent, and update the adjustment point;

[0022] If there is no intersection, adjust the current compensation coil to move towards the center of the compensation coil until the current magnetic field range information between adjacent compensation coils is tangent, and update the adjustment point.

[0023] By adopting the above technical solutions, judge the magnetic field range information between the compensation coils to control whether they are tangent. Once there is an intersection or no intersection, adjust the position of the compensation coil to update the adjustment point, which has strong practicability.

[0024] Optionally, the method for adjusting the distribution density of the compensation coil includes:

[0025] Adjust the distribution density of the compensation coil according to the difference of the display difference;

[0026] If the display difference is 0, no adjustment is made;

[0027] If the display difference is not 0, find the density value from the preset density distribution database according to the display difference;

[0028] According to the density value and the current magnetic field strength information preset for the current compensation coil, change the maximum spatial order of the field uniformity of the compensation coil until the display difference is 0.

[0029] By adopting the above technical solution, when judging the imaging situation, by judging the display difference, it is possible to understand whether the display is clear, and then control the magnetic field strength to adjust the maximum spatial order of the field uniformity of the compensation coil, which has strong practicability.

[0030] Optionally, the method for adjusting the replacement of the compensation coil includes:

[0031] Find the spatial order value from the preset spatial order database according to the display difference;

[0032] Find the first performance parameter of a single compensation coil from the preset compensation coil database according to the spatial order value;

[0033] Find the single cost value from the preset cost database according to the first performance parameter;

[0034] Arrange the single cost values in reverse order to select the single compensation coil with the lowest cost value.

[0035] By adopting the above technical solution, the sizes of the compensation coils are different. By understanding the first performance parameter of a single compensation coil, the single compensation coil with the lowest cost value can be found from the first performance parameter, thereby reducing the cost.

[0036] Optionally, the method for replacing a single compensation coil with a combination of multiple compensation coils includes:

[0037] Find the second performance parameter after combining multiple compensation coils from the preset combination database according to the spatial order value;

[0038] Find multiple cost values from the preset cost database according to the second performance parameter;

[0039] Arrange the multiple cost values in reverse order to select the multiple combined compensation coils with the lowest cost values;

[0040] Determine whether the single compensation coil with the lowest cost value is less than the multiple combined compensation coils with the lowest cost value;

[0041] If it is less, select the single compensation coil with the lowest cost value;

[0042] If it is greater than or equal to, select the multiple combined compensation coils with the lowest cost value.

[0043] By adopting the above technical solution, once multiple combined compensation coils can be used, the single compensation coil and the combined compensation coil are also compared, so as to screen out the coils with low cost and conforming functions, and the practicability is strong.

[0044] Optionally, the method for generating the combined database of the current spatial order value includes:

[0045] Perform tests on the compensation coil arrangement mode in the preset simulation database according to the spatial order value to obtain the compensation coil arrangement mode;

[0046] Classify the compensation coil arrangement modes in groups with the same number of compensation coils, and select the group with the least number of compensation coils;

[0047] Put the group with the least number of compensation coils into the combined database of the current spatial order value.

[0048] By adopting the above technical solution, in the process of generating the combined database, different combined arrangement modes are tested, so as to select the arrangement mode of the compensation coils that meets the requirements of the spatial order value, thereby improving the combined database.

[0049] In a second aspect, the present application provides a magnetic resonance static magnetic field inhomogeneity compensation system, adopting the following technical solution:

[0050] A magnetic resonance static magnetic field inhomogeneity compensation system includes:

[0051] An acquisition module, configured to acquire the current static magnetic field information of the current device;

[0052] A processing module, connected to the acquisition module, and configured to find out the display difference and the difference position from the preset display database according to the current static magnetic field information;

[0053] A judgment module, connected to the processing module, and configured to perform information processing and judgment;

[0054] The judgment module adjusts the initial position of the preset compensation coil according to the difference position, and the judgment module adjusts the initial distribution density of the preset compensation coil according to the display difference.

[0055] By adopting the above technical solution, the current static magnetic field information is obtained, so as to obtain the display difference and the position of the difference, to judge the unclear display areas and positions, and by adjusting the position and distribution density of the compensation coil, the array scale and spatial distribution density are improved to increase the maximum spatial order that can be achieved for field uniformity. Radio frequency electromagnetic waves cannot generate effective induced current in the wire loop of the field uniformity coil, so it is well isolated from the radio frequency coil for magnetic resonance imaging, minimizing interference with each other and facilitating the adjustment of the field uniformity freedom.

[0056] In a third aspect, the present application provides an array module, adopting the following technical solution:

[0057] An array module, characterized in that it includes a memory, a processor and a compensation coil, and a computer program capable of being loaded and executed by the processor as the above method is stored on the memory.

[0058] By adopting the above technical solution, the current static magnetic field information is obtained, so as to obtain the display difference and the position of the difference, to judge the unclear display areas and positions, and by adjusting the position and distribution density of the compensation coil, the array scale and spatial distribution density are improved to increase the maximum spatial order that can be achieved for field uniformity. Radio frequency electromagnetic waves cannot generate effective induced current in the wire loop of the field uniformity coil, so it is well isolated from the radio frequency coil for magnetic resonance imaging, minimizing interference with each other and facilitating the adjustment of the field uniformity freedom.

[0059] In summary, the present application includes at least one of the following beneficial technical effects:

[0060] 1. The array scale and spatial distribution density are improved to increase the maximum spatial order that can be achieved for field uniformity.

[0061] 2. Radio frequency electromagnetic waves cannot generate effective induced current in the wire loop of the field uniformity coil, so it is well isolated from the radio frequency coil for magnetic resonance imaging, minimizing interference with each other and facilitating the adjustment of the field uniformity freedom.

[0062] 3. Cost is reduced. Description of the Drawings

[0063] Figure 1 It is a schematic structural diagram of the compensation coil.

[0064] Figure 2 It is a schematic circuit diagram of the compensation coil.

[0065] Figure 3 It is a flowchart of the method for compensating the inhomogeneity of the magnetic resonance static magnetic field.

[0066] Figure 4It is a flowchart of the method for adjusting the position of the compensation coil.

[0067] Figure 5 It is a flowchart of the method for updating the position of the adjustment point.

[0068] Figure 6 It is a flowchart of the method for adjusting the distribution density of the compensation coil.

[0069] Figure 7 It is a flowchart of the adjustment method for replacing the compensation coil.

[0070] Figure 8 It is a flowchart of the method for replacing a single compensation coil with a combination of multiple compensation coils.

[0071] Figure 9 It is a flowchart of the method for generating a combined database of the current spatial order values.

[0072] Explanation of reference numerals: 1. Coil body; 2. Choke inductor; 3. Output line; 4. Circuit board; 5. Input line; 6. Filter circuit; 7. Inductor; 8. Capacitor; 9. Compensation coil. Detailed implementation manners

[0073] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the following further elaborates on the present application in conjunction with the appended Figures 1-9 drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0074] The embodiment of the present application discloses a method for compensating the inhomogeneity of the static magnetic field in magnetic resonance, which improves the array scale and spatial distribution density to increase the maximum spatial order that can be achieved in field shimming. Radio frequency electromagnetic waves cannot generate effective induced current in the wire loop of the field shimming coil, so it is well isolated from the radio frequency coil for magnetic resonance imaging, minimizing interference with each other and facilitating adjustment of the field shimming freedom.

[0075] Refer to Figure 1 , the compensation coil 9 includes a coil body 1, and the coil body 1 is wound with enameled wire. The diameter of the coil body 1 can be adjusted according to the actual length and can be adjusted by the staff according to requirements, which will not be elaborated here.

[0076] A choke inductor 2 is also connected in series on the coil body 1. At least one choke inductor 2 is provided, and the resonance frequency of the choke inductor 2 is consistent with the magnetic resonance Larmor frequency. And as the circumference of the coil body 1 increases, the distance between the choke inductors 2 < 1 / 2 of the wavelength of the magnetic resonance radio frequency.

[0077] Two separate output lines 3 are welded to both ends of the coil body 1. The output lines 3 are made of wires wrapped with plastic sheaths to isolate signals. The two output lines 3 are intertwined with each other to eliminate interference. A circuit board 4 is also welded to the side of the output line 3 away from the coil body 1. There is at least one circuit board 4, and the circuit board 4 is added according to the actual situation. When multiple circuit boards 4 are used, adjacent circuit boards 4 are connected by additional output lines 3.

[0078] One end of the circuit board 4 away from the choke inductor 2 is also connected to an input line 5 for inputting direct current. When multiple circuit boards 4 are set, the input line 5 is connected to the circuit board 4 that is farthest from the coil body 1. The input line 5 is also made of a wire wrapped with a plastic sheath, and the two input lines 5 are intertwined with each other to eliminate interference.

[0079] The circuit board 4 includes a group of filter circuits 6. There can also be multiple groups of filter circuits 6. The multiple groups of filter circuits 6 are connected in series with each other, that is, multiple circuit boards 4 are connected in series with each other.

[0080] Referring to Figure 2 , in this embodiment, two groups of circuit boards 4 and three groups of choke inductors 2 are taken as examples for disclosure. When multiple groups of filter circuits 6 or choke inductors 2 are used, their working principles and connection methods are the same. The working principles and connection methods are common knowledge for those skilled in the art and will not be elaborated here.

[0081] And the compensation coil 9 is taken as a unit, and this unit is used as a matrix point. Multiple units are used in cooperation to piece together the required array coil for use.

[0082] Referring to Figure 3 , a method of compensating for the inhomogeneity of the static magnetic field by array-combining separate compensation coils 9 to replace driving multiple shim coils with different spatial orders to generate static magnetic fields with different degrees of spatial variation to compensate for various inhomogeneities of the static magnetic field.

[0083] A method for compensating the inhomogeneity of the static magnetic field in magnetic resonance includes the following steps:

[0084] Step 100: Obtain the current static magnetic field information of the current device.

[0085] When the device is in use, the current static magnetic field information is obtained through a sensor to obtain the image information generated by magnetic resonance. By the quality of the generated image information, the compensation coil 9 is adjusted until the generated image information is clear.

[0086] Step 101: Find out the display difference and the difference position from the preset display database according to the current static magnetic field information.

[0087] The display database is a preset database, and has different display standards for images of different parts, and is pre-collected and input into the display database by the staff for later comparison of images.

[0088] From the display database, find out the display difference and the difference position through the display image corresponding to the static magnetic field information.

[0089] The display difference is the difference that needs to be reached to display clearly. By comparing the image with the pre-set data, the calculated value is obtained. When calculating, by comparing the clarity of the display, once there is a display, the difference is calculated through the preset light and dark ratio according to the light and dark degree of the clarity. When there is no display and display is required here, the ratio is directly adjusted to the maximum value.

[0090] The difference position is the position where display is required. There should be an image for display, but there is no image display at this time. At this time, due to interference, the imaging is not clear, so the difference position of the position is calculated. When calculating the position, through the preset positioning points, the positioning points that need to be displayed but are not displayed are judged.

[0091] Step 102: Adjust the initial position of the preset compensation coil 9 according to the difference position.

[0092] By understanding the difference position, the position of the preset compensation coil 9 is adjusted.

[0093] Combined with Figure 4 , when adjusting the position of the compensation coil 9, the position adjustment method includes the following steps:

[0094] Step 200: Adjust the position of the compensation coil 9 according to the difference of the difference position.

[0095] Adjust the position of the compensation coil 9 according to the obtained difference of the difference position. When adjusting, first judge the difference position.

[0096] Step 201: If the difference position is 0, no adjustment is made.

[0097] If the difference position is 0, it means that the current position is accurate and there is a correct image for calculation, so no adjustment is made.

[0098] Step 202: If the difference position is not 0, find out the adjustment point from the preset position distribution database according to the difference position.

[0099] If the difference position is not 0, that is, greater than 0 or less than 0, it indicates an offset at this time. Therefore, it is necessary to adjust the position of the compensation coil 9, and the adjustment point is found from the position distribution database according to the difference position.

[0100] Among them, the position distribution database is a pre-set database, and the position database is located by the staff according to the size of the detected picture, so as to confirm the position of the adjustment point.

[0101] Step 203: Add a compensation coil 9 to the adjustment point according to the adjustment point and the current magnetic field range information preset by the current compensation coil 9 until the difference position is 0.

[0102] For each different compensation coil 9, there is different current magnetic field range information. By understanding the magnetic field range information, a compensation coil 9 is added to the adjustment point until the difference position is 0 to meet the detection requirements.

[0103] Combined with Figure 5 , judge the repeated coverage situation of the current magnetic field range information of the compensation coil 9 to update the position of the adjustment point. The method for updating the adjustment point position includes the following steps:

[0104] Step 300: Judge whether there is an intersection in the current magnetic field range information between adjacent compensation coils 9.

[0105] Judge the intersection of the compensation coils 9, so as to reduce the overall waste caused by the overlap of the compensation coils 9 and also reduce the problem of unclear display caused by the over-dispersion of the compensation coils 9. Therefore, judge whether there is an intersection in the current magnetic field range information between adjacent compensation coils 9.

[0106] Step 301: If there is an intersection, adjust the current compensation coil 9 to move towards the adjustment point until the current magnetic field range information between adjacent compensation coils 9 is tangent, and update the adjustment point.

[0107] Since the effective range covered by the magnetic field range information is limited, the effective range of the magnetic field range information is enclosed to confirm the boundary.

[0108] Once there is an intersection in the current magnetic field range information between adjacent compensation coils 9, adjust the current compensation coil 9 to move towards the adjustment point until the current magnetic field range information between adjacent compensation coils 9 is tangent, and update the adjustment point.

[0109] Step 302: If there is no intersection, adjust the current compensation coil 9 to move towards the center of the compensation coil 9 until the current magnetic field range information between adjacent compensation coils 9 is tangent, and update the adjustment point.

[0110] Once there is no intersection in the current magnetic field range information between adjacent compensation coils 9, adjust the current compensation coils 9 to move towards the center of the compensation coils 9 until the current magnetic field range information between adjacent compensation coils 9 is tangent, and update the adjustment points.

[0111] Refer to Figure 3 , step 103: Adjust the initial distribution density of the preset compensation coils 9 according to the display difference.

[0112] By understanding the display difference, the initial distribution density of the preset compensation coils 9 is adjusted to improve clarity.

[0113] Combined with Figure 6 , the distribution density adjustment method of the compensation coils 9 includes the following steps:

[0114] Step 400: Adjust the distribution density of the compensation coils 9 according to the difference of the display difference.

[0115] Adjust the distribution density of the compensation coils 9 according to the difference of the display difference, so as to adjust the displayed state.

[0116] Step 401: If the display difference is 0, no adjustment is made.

[0117] If the display difference is 0, it means that the current position is clearly displayed and there is a clear enough image for calculation, so no adjustment is made.

[0118] Step 402: If the display difference is not 0, find the density value from the preset density distribution database according to the display difference.

[0119] If the display position is not 0, that is, greater than 0 or less than 0, it means that there is a situation of insufficient clarity or even ghosting at this time. Therefore, it is necessary to adjust the distribution density of the compensation coils 9 to improve the image clarity.

[0120] Find the density value from the density distribution database through the display difference. The density distribution database is preset data, which is collected and input by the staff to be improved. The density value can be matched by evaluating the display difference.

[0121] Step 403: According to the density value and the current magnetic field intensity information preset by the current compensation coils 9, replace the maximum spatial order of the field uniformity of the compensation coils 9 until the display difference is 0.

[0122] Each compensation coil 9 has its own magnetic field intensity information. According to the matched density value and the current magnetic field intensity information of the current compensation coils 9, the maximum spatial order of the field uniformity of the compensation coils 9 is replaced until the display difference is 0.

[0123] Referring to Figure 7 Figure 7 , when the compensation coil 9 needs to be replaced, the adjustment method for replacing the compensation coil 9 includes the following steps:

[0124] Step 500: Search for the spatial order value from the preset spatial order database according to the displayed difference value.

[0125] According to the matched displayed difference value, search for the spatial order value from the preset spatial order database. The spatial order database is a preset database, which is input and set by the staff and will not be elaborated here.

[0126] Step 501: Search for the first performance parameter of a single compensation coil 9 from the preset compensation coil 9 database according to the spatial order value.

[0127] According to the found spatial order value, search for the first performance parameter of a single compensation coil 9 from the compensation coil 9 database. The compensation coil 9 database is a preset database and is input and set by the staff, which will not be elaborated here.

[0128] Since the first performance parameter of a single compensation coil 9 will change according to different materials, capacitance, inductance values and numbers, adjustment is made accordingly.

[0129] Step 502: Search for a single cost value from the preset cost database according to the first performance parameter.

[0130] According to the required first performance parameter, search for a single cost value from the cost database. The cost database is a preset database, and different compensation coils 9 with different costs can be matched according to the required first performance parameter.

[0131] Step 503: Reverse the order of the single cost values to select the single compensation coil 9 with the lowest cost value.

[0132] Under the condition of meeting the first performance parameter, reverse the order of the single cost values to select the single compensation coil 9 with the lowest cost value, so as to reduce the overall cost.

[0133] Referring to Figure 8 Figure 8 , when the cost of a single compensation coil 9 increases, multiple compensation coils 9 can be combined to replace a single compensation coil 9. The method for combining multiple compensation coils 9 to replace a single compensation coil 9 includes the following steps:

[0134] Step 600: Search for the second performance parameter after combining multiple compensation coils 9 from the preset combination database according to the spatial order value.

[0135] Among them, the combined database is a preset database, and the data is imported by the staff, which will not be elaborated here. Without changing the spatial order value, multiple second performance parameters after combining the compensation coils 9 are retrieved from the combined database according to the spatial order value.

[0136] Step 601: Retrieve multiple cost values from the preset cost database according to the second performance parameters.

[0137] Among them, the cost database is preset data, and multiple cost values are retrieved from the cost database according to the second performance parameters of the combination of multiple compensation coils 9.

[0138] Step 602: Arrange the multiple cost values in reverse order to select multiple combined compensation coils 9 with the lowest cost values.

[0139] Under the condition of meeting the second performance parameters, arrange the multiple cost values in reverse order, so as to select multiple combined compensation coils 9 with the lowest cost values.

[0140] Step 603: Determine whether the single compensation coil 9 with the lowest cost value is less than the multiple combined compensation coils 9 with the lowest cost values.

[0141] Judge the cost between the single compensation coil 9 with the lowest cost value and the multiple combined compensation coils 9 with the lowest cost values, so as to select multiple combined compensation coils 9 or a single compensation coil 9.

[0142] Step 604: If it is less, select the single compensation coil 9 with the lowest cost value.

[0143] When the single compensation coil 9 with the lowest cost value is less than the multiple combined compensation coils 9 with the lowest cost values, select the single compensation coil 9 with the lowest cost value for use.

[0144] Step 605: If it is greater than or equal to, select the multiple combined compensation coils 9 with the lowest cost values.

[0145] When the single compensation coil 9 with the lowest cost value is greater than or equal to the multiple combined compensation coils 9 with the lowest cost values, select the multiple combined compensation coils 9 with the lowest cost values, so as to improve the overall stability.

[0146] Refer to Figure 9 , the generation method of the combined database of the current spatial order value includes the following steps:

[0147] Step 700: Test the arrangement mode of the compensation coils 9 in the preset simulation database according to the spatial order value to obtain the arrangement mode of the compensation coils 9.

[0148] Arrange the compensation coil 9 according to the found spatial order value in the simulation database for testing. The simulation database is preset data and has the ability of active learning. The internal program is set by the staff, which will not be elaborated here.

[0149] Thus, obtain the arrangement mode of the compensation coil 9 from the simulation database. The arrangement mode of the compensation coil 9 can be parallel, overlapping, or cross, etc.

[0150] Step 701: Classify the arrangement modes of the compensation coil 9 in groups with the same number of compensation coils 9, and select the group with the least number of compensation coils 9.

[0151] Taking the same number of compensation coils 9 as a group, classify the arrangement modes of the compensation coil 9, and select the group with the least number of compensation coils 9 from them, that is, the group with the lowest cost.

[0152] Step 702: Put the group with the least number of compensation coils 9 into the combination database of the current spatial order value.

[0153] In the group with the least number of compensation coils 9, there may be multiple combination modes. At this time, put this group of compensation coils 9 into the combination database of the current spatial order value for easy debugging.

[0154] Based on the same inventive concept, an embodiment of the present invention provides a magnetic resonance static magnetic field inhomogeneity compensation system, including:

[0155] An acquisition module for acquiring the current static magnetic field information of the current device;

[0156] A processing module, connected to the acquisition module, for finding out the display difference and the difference position from the preset display database according to the current static magnetic field information;

[0157] A judgment module, connected to the processing module, and used for information processing and judgment;

[0158] The judgment module adjusts the initial position of the preset compensation coil 9 according to the difference position, and the judgment module adjusts the initial distribution density of the preset compensation coil 9 according to the display difference.

[0159] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working processes of the system, device, and unit described above can refer to the corresponding processes in the foregoing method embodiments, which will not be elaborated here.

[0160] Based on the same inventive concept, an embodiment of the present invention provides an array module, including a memory, a processor, and a compensation coil 9. A computer program capable of being loaded and executed by the processor for compensating the inhomogeneity of the static magnetic field in magnetic resonance is stored on the memory.

[0161] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the above division of each functional module is used as an example. In practical applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working processes of the above-described system, device, and unit can refer to the corresponding processes in the foregoing method embodiments and will not be repeated here.

[0162] The above are all preferred embodiments of the present application. The protection scope of the present application is not limited thereby. Any feature disclosed in this specification (including the abstract and drawings), unless specifically described, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically described, each feature is only an example in a series of equivalent or similar features.

Claims

1. A method for compensating the inhomogeneity of the static magnetic field in magnetic resonance, characterized in that, Including: Obtain the current static magnetic field information of the current device; Find out the display difference and the difference position from the preset display database according to the current static magnetic field information; Adjust the initial position of the preset compensation coil (9) according to the difference position; Adjust the initial distribution density of the preset compensation coil (9) according to the display difference; The position adjustment method of the compensation coil (9) includes: Perform position adjustment on the position of the compensation coil (9) according to the difference of the difference position; If the difference position is 0, no adjustment is performed; If the difference position is not 0, find out the adjustment point from the preset position distribution database according to the difference position; Add a compensation coil (9) to the adjustment point according to the adjustment point and the current magnetic field range information preset by the current compensation coil (9) until the difference position is 0; Judge the repeated coverage situation of the current magnetic field range information of the compensation coil (9) to update the position of the adjustment point. The method for updating the adjustment point position includes: Judge whether there is an intersection in the current magnetic field range information between adjacent compensation coils (9); If there is an intersection, adjust the current compensation coil (9) to move towards the adjustment point until the current magnetic field range information between adjacent compensation coils (9) is tangent, and update the adjustment point; If there is no intersection, adjust the current compensation coil (9) to move towards the center of the compensation coil (9) until the current magnetic field range information between adjacent compensation coils (9) is tangent, and update the adjustment point.

2. The method for compensating the inhomogeneity of the static magnetic field in magnetic resonance according to claim 1, wherein: The distribution density adjustment method of the compensation coil (9) includes: Adjust the distribution density of the compensation coil (9) according to the difference of the display difference; If the display difference is 0, no adjustment is performed; If the display difference is not 0, find out the density value from the preset density distribution database according to the display difference; Replace the maximum spatial order of the field uniformity of the compensation coil (9) according to the density value and the current magnetic field intensity information preset by the current compensation coil (9) until the display difference is 0.

3. A method for compensating the inhomogeneity of the static magnetic field in magnetic resonance according to claim 2, characterized in that: The adjustment method for replacing the compensation coil (9) includes: Find out the spatial order value from the preset spatial order database according to the display difference; Find out the first performance parameter of a single compensation coil (9) from the preset compensation coil (9) database according to the spatial order value; Find out a single cost value from the preset cost database according to the first performance parameter; Arrange the single cost values in reverse order to select the single compensation coil (9) with the lowest cost value.

4. A method for compensating the inhomogeneity of the static magnetic field in magnetic resonance according to claim 3, characterized in that: The method for combining multiple compensation coils (9) to replace a single compensation coil (9) includes: Find out the second performance parameter after combining multiple compensation coils (9) from the preset combination database according to the spatial order value; Find out multiple cost values from the preset cost database according to the second performance parameter; Arrange the multiple cost values in reverse order to select the multiple combined compensation coils (9) with the lowest cost value; Judge whether the single compensation coil (9) with the lowest cost value is less than the multiple combined compensation coils (9) with the lowest cost value; If it is less, select the single compensation coil (9) with the lowest cost value; If it is greater than or equal to, select the multiple combined compensation coils (9) with the lowest cost value.

5. A method for compensating for the inhomogeneity of the static magnetic field in magnetic resonance according to claim 4, characterized in that: The method for generating a combined database of current spatial order values includes: Testing the arrangement of the compensation coil (9) in the preset simulation database according to the spatial order value to obtain the arrangement of the compensation coil (9); Classifying the arrangements of the compensation coil (9) into groups with the same number of compensation coils (9), and selecting the group with the least number of compensation coils (9); Putting the group with the least number of compensation coils (9) into the combined database of the current spatial order value.

6. A magnetic resonance static magnetic field inhomogeneity compensation system, characterized in that, Including: An acquisition module for acquiring the current static magnetic field information of the current device; A processing module connected to the acquisition module for finding out the display difference and the difference position from the preset display database according to the current static magnetic field information; A judgment module connected to the processing module and used for processing and judging information; The judgment module adjusts the initial position of the preset compensation coil (9) according to the difference position, and the judgment module adjusts the initial distribution density of the preset compensation coil (9) according to the display difference; The magnetic resonance static magnetic field inhomogeneity compensation system is further used to adjust the position of the compensation coil (9) according to the difference at the difference position; if the difference position is 0, no adjustment is made; if the difference position is not 0, the adjustment point is found from the preset position distribution database according to the difference position; according to the adjustment point and the current magnetic field range information preset by the current compensation coil (9), a compensation coil (9) is added to the adjustment point until the difference position is 0; The magnetic resonance static magnetic field inhomogeneity compensation system is further used to judge whether there is an intersection in the current magnetic field range information between adjacent compensation coils (9); if there is an intersection, adjust the current compensation coil (9) to move towards the adjustment point until the current magnetic field range information between adjacent compensation coils (9) is tangent, and update the adjustment point; if there is no intersection, adjust the current compensation coil (9) to move towards the center of the compensation coil (9) until the current magnetic field range information between adjacent compensation coils (9) is tangent, and update the adjustment point.

7. An array module, characterized in that, It includes a memory, a processor, and a compensation coil (9). A computer program capable of being loaded and executed by the processor as any one of the methods in claims 1 to 5 is stored on the memory.

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