Magnetic resonance coil and magnetic resonance apparatus

Abstract

The utility model relates to a magnetic resonance coil and magnetic resonance equipment. The magnetic resonance coil comprises at least two body coils and a plurality of radio frequency power drivers, wherein the body coils are arranged front and back in the axial direction; each individual coil comprises a plurality of loop units; each radio frequency power driver is correspondingly connected with at least one loop unit; a gap exists between the two body coils in the axial direction, or at least parts of the two body coils are overlapped in the axial direction; and each radio frequency power driver is used for controlling the phase and amplitude of the radio frequency pulse transmitted by the corresponding at least one loop unit so as to form a uniform radio frequency field. By adopting the magnetic resonance coil, the uniformity of a radio frequency field in the axial direction of the coil can be improved.

Description

Technical Field

[0001] The present application relates to the field of magnetic resonance technology, and particularly to a magnetic resonance coil and a magnetic resonance device. Background Art

[0002] As one of the very important components of a magnetic resonance system, the magnetic resonance coil largely determines the quality and imaging speed of magnetic resonance images.

[0003] In the related art, the magnetic resonance coil includes a transmitting coil and a receiving coil. The transmitting coil is used to send radio frequency signals to a patient, and the receiving coil is used to receive magnetic resonance signals for magnetic resonance imaging of the patient.

[0004] However, the magnetic resonance coil in the related art has a problem of poor radio frequency field uniformity in the axial direction of the coil. Summary of the Invention

[0005] Based on this, it is necessary to provide a magnetic resonance coil and a magnetic resonance device for the above technical problems, which can improve the radio frequency field uniformity of the magnetic resonance coil in the axial direction of the coil.

[0006] In a first aspect, the present application provides a magnetic resonance coil, which includes: at least two body coils arranged axially before and after, and a plurality of radio frequency power drivers; each body coil includes a plurality of loop units; each radio frequency power driver is correspondingly connected to at least one loop unit;

[0007] There is a gap between the two body coils in the axial direction, or at least partially overlap in the axial direction;

[0008] Each radio frequency power driver is used to control the phase and amplitude of the radio frequency pulse emitted by the corresponding at least one loop unit to form a uniform radio frequency field.

[0009] In one embodiment, the two body coils include a first body coil and a second body coil, and each loop unit in the first body coil overlaps with the loop unit at the corresponding position in the second body coil.

[0010] In one embodiment, there is an overlapping area in the overlapping arrangement; the overlapping area between each loop unit in the first body coil and the loop unit at the corresponding position in the second body coil is the same.

[0011] In one embodiment, the overlapping area is determined according to the axial distance between the first body coil and the second body coil and the decoupling performance parameters of the coil.

[0012] In one embodiment, the overlapping area is determined according to the size of the two loop units arranged to overlap each other and the decoupling performance parameters of the coil.

[0013] In one embodiment, the two body coils include a first body coil and a second body coil, and there is a preset axial distance between the first body coil and the second body coil in the axial direction;

[0014] The axial distance is determined according to the decoupling performance parameters of the coils.

[0015] In one embodiment, each RF power driver is connected to two loop units, and the two loop units are any two loop units in the same body coil.

[0016] In one embodiment, each RF power driver is connected to two loop units, and the two loop units belong to different body coils respectively.

[0017] In one embodiment, there is a common side between adjacent loop units in each body coil.

[0018] In a second aspect, the present application further provides a magnetic resonance device, which includes:

[0019] A support cylinder having opposite left and right ports;

[0020] A first body coil disposed on the support cylinder and including a plurality of loop units;

[0021] A second body coil disposed on the support cylinder and including a plurality of loop units, and the first body coil and the second body coil are arranged axially before and after along the support cylinder;

[0022] There is a gap between the first body coil and the second body coil in the axial direction, or at least a part of the first body coil and the second body coil overlap in the axial direction;

[0023] A plurality of RF power drivers, each RF power driver is correspondingly connected to at least one loop unit to control the phase and amplitude of the RF pulse emitted by the corresponding at least one loop unit.

[0024] In one embodiment, the first body coil includes eight loop units; the second body coil includes eight loop units;

[0025] There is a common side between adjacent loop units belonging to the same body coil.

[0026] In one embodiment, the first body coil includes a feed port arranged along its circumferential direction, and the second body coil includes a feed port arranged along its circumferential direction, and an RF power line is connected at each feed port;

[0027] The RF power line belonging to the first body coil extends from the first body coil towards the left port direction of the support cylinder;

[0028] The radio frequency power line belonging to the second body coil extends from the second body coil towards the right port direction of the support cylinder.

[0029] In one embodiment, the magnetic resonance device further includes:

[0030] A third body coil, arranged on the support cylinder and axially adjacent to the second body coil before and after along the support cylinder;

[0031] The third body coil includes a plurality of loop units, and there is partial overlap between the second body coil and the third body coil in the axial direction.

[0032] The above magnetic resonance coil and magnetic resonance device, the magnetic resonance coil includes: at least two body coils arranged axially before and after and a plurality of radio frequency power drivers; each body coil includes a plurality of loop units; each radio frequency power driver is correspondingly connected to at least one loop unit; there is a gap between two body coils in the axial direction, or, at least part of two body coils overlap in the axial direction; each radio frequency power driver is used to control the phase and amplitude of the radio frequency pulse emitted by the corresponding at least one loop unit to form a uniform radio frequency field. In the structure of the magnetic resonance coil, by restricting the minimum number of body coils, at least two body coils are arranged in the axial direction, providing the possibility of radio frequency shimming in the axial direction. And there is a gap between adjacent body coils, or at least part of them overlap in the axial direction, so that the coupling between adjacent body coils is relatively low. In this way, the multiple loop units in the multiple body coils can normally emit radio frequency pulses. On this basis, by respectively controlling the loop units in each body coil through a plurality of radio frequency power drivers, the strength of the radio frequency field in each body coil can be controlled, and there is a certain degree of freedom in the axial direction of the magnetic resonance coil, making the radio frequency field in the axial direction more uniform, thereby improving the quality of magnetic resonance imaging. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments of the present application or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0034] Figure 1 It is a schematic structural diagram of a magnetic resonance coil in an embodiment;

[0035] Figure 2 It is a schematic diagram of three body coils in an embodiment;

[0036] Figure 3Schematic diagram of the first structure of two body coils in one embodiment;

[0037] Figure 4 Schematic diagram of the second structure of two body coils in one embodiment;

[0038] Figure 5 First schematic diagram of the overlapping area in one embodiment;

[0039] Figure 6 Second schematic diagram of the overlapping area in one embodiment;

[0040] Figure 7 Schematic diagram of the third structure of two body coils in one embodiment;

[0041] Figure 8 Schematic diagram of the transmitting coil structure of a magnetic resonance device in one embodiment.

[0042] Explanation of reference numerals:

[0043] 10: Magnetic resonance coil; 11: At least two body coils arranged axially front and back; 111: First body coil; 112: Second body coil; 12: Multiple RF power drivers; TX1, TX2...TX16: Multiple loop units; 20: Magnetic resonance device; 21: Support cylinder; 22: Tuning component; 221: First adjustable capacitor; 222: First tuning rod; 23: Tuning coupling component; 231: Second adjustable capacitor; 232: Second tuning rod. Detailed implementation manners

[0044] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying 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.

[0045] Before introducing the technical solutions of the present application in detail, the background technology of the present application will be briefly introduced.

[0046] Magnetic Resonance Imaging (MRI) technology is an imaging technology that uses the nuclei in the human body to resonate with an externally applied RF magnetic field in a magnetic field to generate images.

[0047] In related technologies, a single body coil is only arranged in the axial direction of the magnetic resonance coil in a magnetic resonance device. The single body coil can ensure the uniformity of the RF fields in the other two directions perpendicular to the axial direction of the coil. However, the uniformity in the axial direction of the coil is poor.

[0048] In view of the above problems, the present application provides a magnetic resonance coil and a magnetic resonance device, which can improve the uniformity of the radio frequency field of the magnetic resonance coil in the axial direction of the coil. Of course, the technical solutions provided in the embodiments of the present application are not limited to only solving the above problems, and there are other technical effects. For specific details, please refer to the following embodiments. Next, the technical solutions of the present application will be introduced in detail.

[0049] In one embodiment, a magnetic resonance coil is provided. As Figure 1 shown, the magnetic resonance coil 10 includes: at least two body coils 11 arranged axially front and back, and a plurality of radio frequency power drivers 12. Each body coil includes a plurality of loop units; each radio frequency power driver 12 is correspondingly connected to at least one loop unit;

[0050] There is a gap between the two body coils in the axial direction, or at least part of the two body coils overlap in the axial direction;

[0051] Each radio frequency power driver 12 is used to control the magnetic resonance signal phase and power of the corresponding at least one loop unit to uniform the radio frequency field of the magnetic resonance coil 10 in the axial direction.

[0052] Among them, the magnetic resonance coil 10 can be a transmitting coil or a receiving coil. When performing magnetic resonance imaging, the patient needs to be moved into the magnetic resonance coil 10 through a magnetic resonance hospital bed, a radio frequency field is sent to the patient through the magnetic resonance coil, and the magnetic resonance signal is received, and magnetic resonance imaging is performed according to the magnetic resonance signal.

[0053] The magnetic resonance coil 10 in the related art includes a single body coil. In order to meet the needs of magnetic resonance imaging, a single body coil needs to be set with a uniform radio frequency field in a sufficient range in the axial direction. It should be noted that the axial direction refers to the axial direction of the support cylinder of the magnetic resonance device, and this axial direction can be represented as the Z axis, and the direction perpendicular to the axial direction can be represented as the X and Y axes.

[0054] The magnetic resonance coil 10 in the embodiments of the present application includes at least two body coils arranged axially front and back. The more the number of body coils, the shorter the length of each body coil in the axial direction; the fewer the number of body coils, the longer the length of each body coil in the axial direction. For example, the magnetic resonance coil 10 can include 2 body coils, or can include a larger number of body coils. The embodiments of the present application do not limit the number of body coils. Figure 2 A schematic diagram showing three body coils. It can be seen from the figure that the first body coil, the second body coil, and the third body coil are arranged axially front and back along the support cylinder 21 in sequence. The first body coil and the second body coil partially overlap in the axial direction, and the second body coil and the third body coil partially overlap in the axial direction.

[0055] Taking two body coils as an example for illustration, in order for the magnetic resonance coil to normally emit radio frequency pulses, the two body coils arranged axially front and back need to meet preset conditions. In one case, there is a gap between the two body coils in the axial direction, and in another case, the two body coils at least partially overlap in the axial direction. Figure 3 It is the first structural schematic diagram of two body coils. As can be seen from Figure 3 it, at least part of the adjacent two body coils overlap in the axial direction.

[0056] Continuing to take the magnetic resonance coil 10 including two body coils and each radio frequency power driver controlling one loop unit as an example for illustration, referring to Figure 3 , TX1, TX2, TX3, TX4, TX5, TX6, TX7, TX8, TX9, TX10, TX11, TX12, TX13, TX14, TX15, and TX16 respectively refer to one loop unit. Each loop unit in the figure is rectangular in shape, and the size of each loop unit is the same. Among them, the 8 loop units of TX1, TX2, TX3, TX4, TX5, TX6, TX7, and TX8 are combined into the first body coil, and the 8 loop units of TX9, TX10, TX11, TX12, TX13, TX14, TX15, and TX16 are combined into the second body coil. The number of loop units included in each body coil can be set artificially. For example, each body coil includes 10 loop units or 12 loop units, etc. It should be noted that the number of loop units included in each body coil needs to be the same. For example, each body coil includes 12 loop units.

[0057] On this basis, one radio frequency power driver can be connected to one loop unit. Corresponding to the 16 loop units in Figure 3 , 16 radio frequency power drivers are required to control each loop unit respectively. In this way, for any one loop unit, one radio frequency power driver can control the phase and amplitude of the radio frequency pulse emitted by the loop unit, so as to uniform the radio frequency field of the magnetic resonance coil in the axial direction, thereby improving the quality of magnetic resonance imaging.

[0058] The above-mentioned magnetic resonance coil includes: at least two body coils arranged axially front and back, and a plurality of radio frequency power drivers; each body coil includes a plurality of loop units; each radio frequency power driver is correspondingly connected to at least one loop unit; there is a gap between the two body coils in the axial direction, or at least part of the two body coils overlap in the axial direction; each radio frequency power driver is used to control the phase and amplitude of the radio frequency pulses emitted by the corresponding at least one loop unit to form a uniform radio frequency field. In terms of the structure of the magnetic resonance coil, by restricting the minimum number of body coils and arranging at least two body coils in the axial direction, the possibility of radio frequency shimming in the axial direction is provided. And there is a gap between adjacent body coils, or at least part of them overlap in the axial direction, so that the coupling between adjacent body coils is relatively low. In this way, the multiple loop units in the multiple body coils can normally emit radio frequency pulses. On this basis, by controlling the multiple loop units in each body coil respectively through a plurality of radio frequency power drivers, the intensity of the radio frequency field in each body coil can be controlled, and there is a certain degree of freedom in the axial direction of the magnetic resonance coil, making the radio frequency field in the axial direction more uniform, thereby improving the quality of magnetic resonance imaging.

[0059] In the above-mentioned embodiment, it is introduced that there is a gap between the two body coils in the axial direction, or at least part of the two body coils overlap in the axial direction. Next, a detailed introduction to the overlapping setting method will be given through an embodiment.

[0060] In one embodiment, as Figure 4 shown, taking the number of body coils being two as an example, the adjacent body coils in the two body coils 11 include the first body coil 111 and the second body coil 112, and each loop unit in the first body coil 111 overlaps with the loop unit at the corresponding position in the second body coil 112.

[0061] In the embodiment of the present application, when the adjacent body coils are the first body coil 111 and the second body coil 112 respectively, there is an overlapping area between the first body coil 111 and the second body coil 112 in the axial direction, that is, the first body coil 111 and the second body coil 112 overlap with each other as a whole. Referring to Figure 3 it can be seen that each loop unit in the first body coil 111 overlaps with the two loop units at the corresponding position in the second body coil 112.

[0062] Specifically, TX1 in the first body coil 111 is overlapped with TX16 and TX9 in the second body coil 112, TX2 in the first body coil 111 is overlapped with TX9 and TX10 in the second body coil 112, TX3 in the first body coil 111 is overlapped with TX10 and TX11 in the second body coil 112, and TX4 in the first body coil 111 is overlapped with TX11 and TX12 in the second body coil 112. TX5 in the first body coil 111 is overlapped with TX12 and TX13 in the second body coil 112, TX6 in the first body coil 111 is overlapped with TX13 and TX14 in the second body coil 112, TX7 in the first body coil 111 is overlapped with TX14 and TX15 in the second body coil 112, and TX8 in the first body coil 111 is overlapped with TX15 and TX16 in the second body coil 112.

[0063] Taking the overlapping setting between TX1 in the first body coil 111 and TX16 and TX9 in the second body coil 112 as an example, the overlapping area between TX1 and TX16 and the overlapping area between TX1 and TX9 can be the same, or the overlapping area between TX1 and TX16 can be larger than the overlapping area between TX1 and TX9, or the overlapping area between TX1 and TX16 can be smaller than the overlapping area between TX1 and TX9. It should be clear that the position of TX1 in the first body coil 111 cannot be completely consistent with that of TX16 or TX9 in the second body coil 112 on the XY axis. In other words, the first body coil 111 and the second body coil 112 need to be staggered at a certain angle on the XY axis (for example, Figure 3 The angle between the first body coil 111 and the second body coil 112 is 22.5°), so that the radio frequency field can be uniformed from different angles, which can improve the uniformity of the radio frequency field of the magnetic resonance coil.

[0064] The two body coils of the magnetic resonance coil include a first body coil and a second body coil, and each loop unit in the first body coil is overlapped with the loop unit at the corresponding position in the second body coil. By overlapping the corresponding loop units in the two body coils, the coupling between adjacent body coils is reduced, so that the two body coils can meet the requirements of normal operation.

[0065] Based on the overlapping arrangement of the loop units of the two body coils, in one embodiment, the overlapping area of the overlapping arrangement is described in detail. Specifically: there is an overlapping area in the overlapping arrangement; the overlapping area between each loop unit in the first body coil 111 and the corresponding loop unit in the second body coil 112 is the same.

[0066] Exemplarily, continuing to refer to Figure 3 , the overlapping areas between TX1 and TX16, between TX1 and TX9, between TX2 and TX9, between TX2 and TX10, between TX3 and TX10, between TX3 and TX11, between TX4 and TX11, between TX4 and TX12, between TX5 and TX12, between TX5 and TX13, between TX6 and TX13, between TX6 and TX14, between TX7 and TX14, between TX7 and TX15, between TX8 and TX15, and between TX8 and TX16 are all the same.

[0067] There is an overlapping area in the above overlapping arrangement; the overlapping area between each loop unit in the first body coil and the corresponding loop unit in the second body coil is the same. Setting the overlapping area between the loop units of the two body coils to the same area makes the structures of each loop unit in a completely identical state, which facilitates subsequent control of the phase and amplitude of multiple loop units.

[0068] During the process of determining the overlapping area, it can be determined by the axial distance between the two body coils or the sizes of the two loop units arranged to overlap each other.

[0069] Then, next, an embodiment is used to introduce the method of determining the overlapping area by the axial distance between the two body coils. The overlapping area is determined according to the axial distance between the first body coil 111 and the second body coil 112 and the decoupling performance parameter of the coil.

[0070] Among them, the decoupling performance parameter of the coil is used to evaluate the quality of the decoupling performance of the coil. If the decoupling performance parameter of the coil is less than the preset threshold, it indicates that the decoupling performance of the coil is good; if the decoupling performance parameter of the coil is greater than or equal to the preset threshold, it indicates that the decoupling performance of the coil is not good.

[0071] All embodiments of this application are for the manufacturing process of the magnetic resonance coil. After the magnetic resonance coil is manufactured, the overlapping area has surely been determined. For the process of determining the overlapping area by the axial distance between the two body coils, it can be achieved in two ways.

[0072] In one case, it can be achieved through experiments. According to a preset step size, at each axial distance, it is determined whether the decoupling performance parameter of the coil is less than a preset threshold. If it is less, it indicates that the decoupling performance of the coil is good, that is, the overlapping area corresponding to this axial distance can decouple the two body coils. If it is greater than or equal to, it indicates that the decoupling performance of the coil is not good, that is, the overlapping area corresponding to this axial distance cannot decouple the two body coils. In this case, continue to judge the next axial distance until the decoupling performance parameter of the coil at a certain axial distance is less than the preset threshold.

[0073] In another case, it can be achieved through simulation. By simulating the decoupling performance parameters at each axial distance, the axial distance corresponding to the decoupling performance parameter less than the preset threshold is determined, so that the most suitable overlapping area can be determined.

[0074] It should be noted that the larger the axial distance, the smaller the overlapping area, and the larger the axial distance, the larger the overlapping area. When the overlapping area and the decoupling performance parameter belong to the normal distribution, then, by increasing or decreasing the axial distance, a more suitable axial distance can be determined from multiple axial distances. At this axial distance, the decoupling performance parameter of the overlapping area is better.

[0075] The above overlapping area is determined according to the axial distance between the first body coil and the second body coil and the decoupling performance parameter of the coil. The axial distance can be used to adjust the axial distance between the first body coil and the second body coil as a whole, and based on the decoupling performance parameter of the coil, the axial distance that meets the decoupling requirements can be accurately determined through the decoupling performance parameter of the coil, so that the overlapping area can be accurately determined.

[0076] In one embodiment, as Figure 5 and Figure 6 shown, a method for determining the overlapping area based on the sizes of two loop units arranged in an overlapping manner is introduced. Specifically: the overlapping area is determined according to the sizes of two loop units arranged in an overlapping manner and the decoupling performance parameter of the coil.

[0077] In the embodiments of the present application, still through the experimental method or the simulation method, a most suitable size is selected from multiple sizes through the decoupling performance parameter of the coil, and the overlapping area corresponding to this size can meet the decoupling requirements of the two body coils. Among them, the overlapping area between TX1 and TX16 depends on the sizes of TX1 and TX16, and the overlapping area between TX1 and TX9 depends on the sizes of TX1 and TX9.

[0078] Taking TX1 and TX9 as an example, referring to Figure 5 、6 , Figure 5 、 6 The shaded part in 6 is the overlapping area. In the embodiments of the present application, the total area of TX1 and TX9 remains unchanged. Figure 5 It represents the case where the overlapping area becomes smaller. When the sizes of TX1 and TX9 continuously increase, the area of the shaded part continuously decreases, that is, the overlapping area continuously decreases. Figure 6 It represents the case where the overlapping area becomes larger. When the sizes of TX1 and TX9 continuously decrease, the area of the shaded part continuously increases, that is, the overlapping area continuously increases.

[0079] The above overlapping area is determined according to the sizes of two loop units arranged overlapping each other and the decoupling performance parameters of the coils. In this way, by adjusting the sizes of the two overlapping loop units, the most suitable overlapping area can be determined, and this process will not affect the overlapping areas of other loop units, with higher flexibility.

[0080] Next, a setting method in which there is a gap between two body coils in the axial direction will be introduced. In one embodiment, as Figure 7 shown, the two body coils include a first body coil 111 and a second body coil 112, and there is a preset axial distance between the first body coil 111 and the second body coil 112 in the axial direction;

[0081] The axial distance is determined according to the decoupling performance parameters of the coils.

[0082] In the embodiments of the present application, the first body coil 111 and the second body coil 112 can be separated, that is, there is a certain axial distance between them in the axial direction.

[0083] Among them, the axial distance is determined according to the decoupling performance parameters of the coils. In the process of determining the axial distance, multiple initial axial distances can also be determined by experiments or simulations according to a preset step size, and the decoupling performance parameters corresponding to each initial axial distance are obtained. According to the comparison of multiple decoupling performance parameters with a preset threshold, the initial axial distance corresponding to the decoupling performance parameter less than the preset threshold is used as the preset axial distance.

[0084] The above two body coils include a first body coil and a second body coil, and there is a preset axial distance between the first body coil and the second body coil in the axial direction. By separating the two body coils and determining a suitable separation distance between the two body coils, the settings of adjacent body coils can meet the requirements of both decoupling and uniformity.

[0085] Each radio frequency power driver can be connected to one loop unit or two loop units. When a radio frequency power driver is connected to two loop units, the two loop units can be two loop units in the same body coil or two loop units in two adjacent body coils.

[0086] Next, a specific example is used to specifically illustrate two loop units in the same body coil. Each radio frequency power driver is connected to two loop units, and the two loop units are two adjacent loop units in the same body coil.

[0087] When the number of radio frequency power drivers is less than the number of loop units, any two loop units at different positions in the same body coil can be connected to one radio frequency power driver. Continuing to refer to Figure 3 , multiple loop units in two body coils can be divided into eight groups, and each group includes two loop units. For example, the eight groups of loop unit groups are: TX1 and TX5, TX2 and TX6, TX3 and TX7, TX4 and TX8, TX9 and TX13, TX10 and TX14, TX11 and TX15, TX12 and TX16.

[0088] In the embodiment of the present application, the phase difference between two loop units connected to the same radio frequency power driver remains fixed, and the power fed into the loop units at two different positions can be changed through the control link. In this way, the degree of freedom of the phase difference between two loop units at different positions will be reduced, but the degree of freedom of the axial radio frequency field can be ensured, that is, the uniformity of the axial radio frequency field will be better. That is to say, this process does not require an increase in the number of radio frequency power drivers, can save hardware costs, and has a good effect on the transformation and upgrading of old magnetic resonance coils.

[0089] Next, a specific example is used to specifically illustrate the specific content of connecting one radio frequency power driver to two loop units in two body coils. Each radio frequency power driver is connected to two loop units, and the two loop units are two adjacent loop units in adjacent body coils.

[0090] When the number of radio frequency power drivers is less than the number of loop units, two adjacent loop units in the axial direction of two body coils can be connected to one radio frequency power driver. Continuing to refer to Figure 3, the multiple loop units of the two body coils can be divided into eight groups, with each group including two loop units. For example, the eight groups of loop unit groups are: TX1 and TX9, TX2 and TX10, TX3 and TX11, TX4 and TX12, TX5 and TX13, TX6 and TX14, TX7 and TX15, TX8 and TX16. It should be emphasized that the two loop units connected to the same radio frequency power driver must be adjacent to each other. For example, TX1 is adjacent to TX9 and TX16 respectively. TX1 and TX9 are connected to the same radio frequency power driver, TX1 and TX16 are connected to the same radio frequency power driver, and TX1 cannot be connected to other loop units except TX9 and TX16.

[0091] In the embodiments of the present application, the phase difference between two loop units in different body coils connected to the same radio frequency power driver remains fixed. The power fed into the loop units at two different positions can be changed through the control link. In this way, the degree of freedom of the phase difference between the two loop units at different positions will be reduced. By only changing the power distribution of the two loop units in different body coils, radio frequency shimming in the axial direction is achieved, improving the uniformity of the axial radio frequency field. That is to say, this process does not require an increase in the number of radio frequency power drivers, can save hardware costs, and has a good effect on the transformation and upgrade of old magnetic resonance coils.

[0092] The above embodiments all introduce the setting methods between the loop units in two adjacent body coils in the axial direction. Next, an embodiment is used to introduce the setting method between adjacent loop units in the same body coil. Specifically, the first body coil includes eight loop units; the second body coil includes eight loop units; there are common sides between adjacent loop units belonging to the same body coil.

[0093] Exemplarily, continuing to refer to Figure 3 , for the first body coil 111, there is a common side between TX1 and TX2, and there is also a common side between TX1 and TX8. The two loop units achieve decoupling between adjacent loop units of the same body coil by setting capacitors. These two common sides are the two sides of the TX1 loop unit. For the second body coil 112, there is a common side between TX9 and TX10, and there is also a common side between TX9 and TX16. These two common sides are the two sides of the TX9 loop unit. For other loop units, the way of the common side is exactly the same as that of TX1, and will not be elaborated here.

[0094] There is a common side between adjacent loop units in each of the above-mentioned individual coils. Connecting adjacent loop units in the way of sharing a common side reduces the hardware cost of each individual coil, and the radio frequency field in the direction perpendicular to the axial direction can be made uniform through the way of sharing a common side.

[0095] Next, the content given in the above embodiments is summarized, which is divided into six cases. Assume that adjacent individual coils among at least two individual coils include a first individual coil and a second individual coil.

[0096] (1) There is an overlapping area between each loop unit in the first individual coil and the loop unit at the corresponding position in the second individual coil. A radio frequency power driver is connected to one loop unit to control the phase and amplitude of the magnetic resonance signal of the corresponding loop unit, so as to make the radio frequency field of the magnetic resonance coil uniform in the axial direction.

[0097] (2) There is a preset axial distance in the axial direction between the first individual coil and the second individual coil. A radio frequency power driver is connected to one loop unit to control the phase and amplitude of the magnetic resonance signal of the corresponding loop unit, so as to make the radio frequency field of the magnetic resonance coil uniform in the axial direction.

[0098] (3) There is an overlapping area between each loop unit in the first individual coil and the loop unit at the corresponding position in the second individual coil. A radio frequency power driver is connected to any two loop units in the same individual coil to control the phase and amplitude of the magnetic resonance signals of the corresponding two loop units, so as to make the radio frequency field of the magnetic resonance coil uniform in the axial direction.

[0099] (4) There is a preset axial distance in the axial direction between the first individual coil and the second individual coil. A radio frequency power driver is connected to any two loop units in the same individual coil to control the phase and amplitude of the magnetic resonance signals of the corresponding two loop units, so as to make the radio frequency field of the magnetic resonance coil uniform in the axial direction.

[0100] (5) There is an overlapping area between each loop unit in the first individual coil and the loop unit at the corresponding position in the second individual coil. A radio frequency power driver is connected to any two loop units in the same individual coil to control the phase and amplitude of the magnetic resonance signals of the corresponding two loop units, so as to make the radio frequency field of the magnetic resonance coil uniform in the axial direction.

[0101] (6) There is a preset axial distance in the axial direction between the first individual coil and the second individual coil. A radio frequency power driver is connected to two axially adjacent loop units in adjacent individual coils to control the phase and amplitude of the magnetic resonance signals of the corresponding two loop units, so as to make the radio frequency field of the magnetic resonance coil uniform in the axial direction.

[0102] In one embodiment, a magnetic resonance device is provided. The magnetic resonance device 20 includes: a support cylinder 21 having opposite left and right ports;

[0103] A first body coil 111 disposed on the support cylinder 21, including a plurality of loop units;

[0104] A second body coil 112 disposed on the support cylinder 21, including a plurality of loop units, and the first body coil 111 and the second body coil 112 are arranged axially before and after along the support cylinder 21;

[0105] There is a gap between the first body coil 111 and the second body coil 112 in the axial direction, or the first body coil 111 and the second body coil 112 at least partially overlap in the axial direction;

[0106] A plurality of RF power drivers 12, each RF power driver is correspondingly connected to at least one loop unit to control the phase and amplitude of the RF pulse emitted by the corresponding at least one loop unit.

[0107] Figure 8 It is a schematic structural diagram of the transmitting coil of the magnetic resonance device. The support cylinder 21 in the transmitting coil is cylindrical, and the first body coil 111 and the second body coil 112 are overlapped and disposed on the support cylinder. The diameter of the support cylinder 21 can be determined by the size of the plurality of loop units in the body coil, and the length of the support cylinder 21 can be determined according to the sum of the lengths of the plurality of body coils.

[0108] From Figure 8 As can be seen, the first body coil 111 and the second body coil 112 include feed ports arranged along their circumferences, and the number of feed ports is the same as the number of feed components. Among them, the feed component includes an RF power line and a notch filter. The RF power line is disposed in a wire groove. One end of the RF power line is connected to the feed port, and the other end is connected to the corresponding RF power driver to transmit a driving signal. The notch filter is used to limit the transmission of the driving signal of a preset frequency to the transmitting coil. In this embodiment, the support cylinder 21 has opposite left and right ports. The first body coil includes feed ports arranged along its circumference, the second body coil includes feed ports arranged along its circumference, and each of the feed ports is connected to an RF power line. The RF power lines belonging to the first body coil extend from the first body coil towards the left port of the support cylinder, and the RF power lines belonging to the second body coil extend from the second body coil towards the right port of the support cylinder. The RF power lines belonging to the same body coil are arranged on the same side, reducing the wiring difficulty.

[0109] The transmitting coil further includes a tuning component 22 and a coupling and tuning component 23. The tuning component 22 is used to finely adjust the resonance frequency of each loop unit. The tuning component 22 includes a first adjustable capacitor 221 and a first tuning rod 222. The first adjustable capacitor 221 is welded to the corresponding loop unit, and the adjustment of the adjustable capacitor is achieved by rotating the first tuning rod 222. The coupling and tuning component 23 includes a second adjustable capacitor 231 and a second tuning rod 232. The second adjustable capacitor 231 is welded to the common side of adjacent loop units in the same body coil, and the adjustment of the adjustable capacitor is achieved by rotating the second tuning rod 232.

[0110] The above magnetic resonance device includes: a support cylinder; a first body coil disposed on the support cylinder and including a plurality of loop units; a second body coil disposed on the support cylinder and including a plurality of loop units, and the first body coil and the second body coil are arranged front and back along the axial direction of the support cylinder; there is a gap between the first body coil and the second body coil in the axial direction, or at least part of the first body coil and the second body coil overlap in the axial direction; a plurality of RF power drivers, each RF power driver is correspondingly connected to at least one loop unit to control the phase and amplitude of the RF pulse emitted by the corresponding at least one loop unit. In the coil structure of the magnetic resonance device, by restricting the minimum number of body coils and arranging at least two body coils in the axial direction, the possibility of performing RF shimming in the axial direction is provided. And there is a gap between adjacent body coils, or at least part of them overlap in the axial direction, so that the coupling between adjacent body coils is relatively low. In this way, the multiple loop units in the multiple body coils can normally emit RF pulses. On this basis, by further controlling the multiple loop units in each body coil respectively through a plurality of RF power drivers, the intensity of the RF field in each body coil can be controlled, and there is a certain degree of freedom in the axial direction of the magnetic resonance coil, making the RF field in the axial direction more uniform, thereby improving the quality of magnetic resonance imaging.

[0111] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should be considered as within the scope recorded in this application.

[0112] The above embodiments only represent several implementation manners of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several deformations and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. A magnetic resonance coil, characterized in that, The magnetic resonance coil includes: at least two body coils arranged axially in the front and rear directions, and a plurality of radio frequency power drivers; each body coil includes a plurality of loop units; each radio frequency power driver is correspondingly connected to at least one loop unit; There is a gap between the two body coils in the axial direction, or at least part of the two body coils overlap in the axial direction; Each of the radio frequency power drivers is used to control the phase and amplitude of the radio frequency pulses emitted by the corresponding at least one loop unit to form a uniform radio frequency field.

2. The magnetic resonance coil according to claim 1, wherein, The two body coils include a first body coil and a second body coil, and each loop unit in the first body coil overlaps with the loop unit at the corresponding position in the second body coil.

3. The magnetic resonance coil according to claim 2, wherein The overlapping areas between each loop unit in the first body coil and the loop unit at the corresponding position in the second body coil are the same.

4. The magnetic resonance coil according to any one of claims 1-3, characterized in that, The two body coils include a first body coil and a second body coil, and there is a preset axial distance between the first body coil and the second body coil in the axial direction; The axial distance is determined according to the decoupling performance parameters of the coil.

5. The magnetic resonance coil according to any one of claims 1 to 3, characterized in that, Each radio frequency power driver is connected to two loop units, and the two loop units are any two loop units in the same body coil; or each radio frequency power driver is connected to two loop units, and the two loop units belong to different body coils respectively.

6. The magnetic resonance coil according to any one of claims 1-3, characterized in that, There is a common side between adjacent loop units in each body coil.

7. A magnetic resonance device, characterized in that, The magnetic resonance device includes: A support cylinder having opposite left and right ports; A first body coil disposed on the support cylinder and including a plurality of loop units; A second body coil disposed on the support cylinder and including a plurality of loop units, and the first body coil and the second body coil are arranged axially in the front and rear directions along the support cylinder; There is a gap between the first body coil and the second body coil in the axial direction, or at least part of the first body coil and the second body coil overlap in the axial direction; A plurality of radio frequency power drivers, and each radio frequency power driver is correspondingly connected to at least one loop unit to control the phase and amplitude of the radio frequency pulses emitted by the corresponding at least one loop unit.

8. The magnetic resonance device according to claim 7, characterized in that, The first body coil includes eight loop units; the second body coil includes eight loop units; There is a common side between adjacent loop units belonging to the same body coil.

9. The magnetic resonance device according to claim 8, characterized in that, The first body coil includes a feeding port arranged along its own circumference, the second body coil includes a feeding port arranged along its own circumference, and a radio frequency power line is connected at each feeding port; The radio frequency power line belonging to the first body coil extends from the first body coil towards the left port direction of the support cylinder; The radio frequency power line belonging to the second body coil extends from the second body coil towards the right port direction of the support cylinder.

10. The magnetic resonance device according to claim 7, characterized in that, The magnetic resonance device further includes: A third body coil disposed on the support cylinder and adjacent to the second body coil axially in the front and rear directions along the support cylinder; The third body coil includes a plurality of loop units, and at least part of the second body coil and the third body coil overlap in the axial direction.

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