Magnetic resonance imaging assembly and magnetic resonance imaging apparatus

Abstract

The application discloses a magnetic resonance imaging assembly and a magnetic resonance imaging device. The magnetic resonance imaging assembly comprises a scanning bed, a coil fixing device and a coil assembly. The scanning bed is used for placing a scanning object. The coil fixing device is detachably connected with the scanning bed. The coil assembly is detachably connected with the coil fixing device. The coil fixing device can adjust the height and the deflection angle of the coil assembly relative to the scanning bed. The application solves the technical problem that the coil position is inconvenient to adjust during magnetic resonance scanning in the prior art.

Description

Technical Field

[0001] This invention relates to the field of life science instrument technology, specifically to a magnetic resonance imaging component and a magnetic resonance imaging device. Background Technology

[0002] Single-loop coils are simple in structure and widely used in high-field magnetic resonance applications, especially in preclinical applications on laboratory mice.

[0003] To ensure consistency in each scan, taking a mouse head scan as an example, the mouse is usually placed on a scanning bed, and then a single-loop coil is attached to the mouse's head and fixed with tape. This fixing method is inconvenient, has poor fixing effect, and cannot adjust the position of the coil, making the scanning process very complicated and inconvenient to use. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a magnetic resonance imaging component and a magnetic resonance imaging device, solving the technical problem that it is inconvenient to adjust the coil position during magnetic resonance scanning in the prior art.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: On one hand, the present invention provides a magnetic resonance imaging assembly, including a scanning bed, a coil fixing device, and a coil assembly. The scanning bed is used to place the object to be scanned; the coil fixing device is detachably connected to the scanning bed; the coil assembly is detachably connected to the coil fixing device; wherein the coil fixing device can adjust the height and deflection angle of the coil assembly relative to the scanning bed.

[0006] In some embodiments, the coil fixing device includes a coil fixing mechanism, a first adjusting mechanism, and a second adjusting mechanism. The coil fixing mechanism is detachably connected to the coil assembly. The first adjusting mechanism is connected to the coil fixing mechanism and is used to adjust the height and deflection angle of the coil fixing mechanism relative to the scanning bed. The second adjusting mechanism is connected to the first adjusting mechanism and is used to adjust the position of the first adjusting mechanism mounted on the scanning bed.

[0007] In some embodiments, the coil fixing mechanism includes a coil fixing frame and a mounting base. The coil fixing frame is detachably connected to the coil assembly, and the mounting base is connected to the coil fixing frame. The mounting base has a mounting portion connected to the first adjustment mechanism, and the first adjustment mechanism is capable of adjusting the position of the mounting portion mounted on the first adjustment mechanism.

[0008] In some embodiments, the first adjustment mechanism includes an adjustment frame, a first adjustment member, and a locking member. The adjustment frame has an adjustment hole and a mounting hole. The adjustment hole penetrates the adjustment frame along a first direction and extends along the extension direction of the adjustment frame. The mounting hole penetrates the adjustment frame along a second direction and extends along the extension direction of the adjustment frame. The first direction is the length direction of the scanning bed, and the second direction is the height direction of the scanning bed. The mounting part is disposed in the mounting hole, and the first adjustment member is disposed in the adjustment hole and passes through the mounting part before being connected to the locking member.

[0009] In some embodiments, the first adjusting member is a screw, the locking member is a slider, the outer wall of the slider abuts against the inner wall of the adjusting hole to restrict the rotation of the slider through the inner wall of the adjusting hole, and the screw passes through the mounting part and is threadedly connected to the slider.

[0010] In some embodiments, the second adjustment mechanism includes a second adjustment member, and a position adjustment hole is formed on the adjustment frame. The position adjustment hole is strip-shaped, and the second adjustment member passes through the position adjustment hole to fix the adjustment frame to the scanning bed.

[0011] In some embodiments, the coil assembly includes a coil body, a circuit structure, and a connection portion. The coil body includes a coil segment, which is an elliptical structure with an opening located at one end of the major axis of the elliptical structure. The connecting part is disposed at the opening of the coil segment. The connecting part has a first end and a second end. The first end of the connecting part is connected to the coil segment, and the second end of the connecting part is connected to the circuit structure. The circuit structure is detachably connected to the coil fixing device.

[0012] In some embodiments, the first end of the connecting portion is on the same plane as the elliptical structure, and the second end of the connecting portion has a height difference with the reference plane, which is the plane where the elliptical structure is located.

[0013] In some embodiments, the coil assembly further includes a tuning capacitor mounted on the coil segment at the other end opposite the opening.

[0014] In some embodiments, the coil holder has a coil conformal space, and the coil assembly has a housing that matches the coil conformal space, the housing being detachably disposed within the coil conformal space.

[0015] On the other hand, the present invention also provides a magnetic resonance imaging device, including a magnet and a magnetic resonance imaging component as described above, wherein a scanning cavity is formed at the center of the magnet, and the magnetic resonance imaging component is capable of entering the scanning cavity.

[0016] Compared with the prior art, the magnetic resonance imaging (MRI) assembly and MRI device provided by the present invention include a coil fixing device in the MRI assembly. The coil is fixed by the coil fixing device, eliminating the need to stick the coil to the scanning area of ​​the object to be scanned with tape. The fixing method is better and can ensure the consistency of each scan. In addition, the coil fixing device can also adjust the height and deflection angle of the coil assembly relative to the scanning bed, thereby allowing the position of the coil assembly to be adjusted during scanning, which provides convenience for MRI scanning. Attached Figure Description

[0017] Figure 1 This is a front structural schematic diagram of an embodiment of the magnetic resonance imaging component provided by the present invention; Figure 2 This is a schematic diagram of the rear structure of an embodiment of the magnetic resonance imaging component provided by the present invention; Figure 3 This is an exploded schematic diagram of an embodiment of the coil fixing device in the magnetic resonance imaging assembly provided by the present invention; Figure 4 This is a schematic diagram of an embodiment of the adjustment frame in the magnetic resonance imaging assembly provided by the present invention; Figure 5 This is a schematic diagram of the position adjustment of the coil fixing device in the magnetic resonance imaging assembly provided by the present invention; Figure 6 This is a schematic diagram of the structure of an embodiment of the coil assembly in the magnetic resonance imaging assembly provided by the present invention; Figure 7 This is a schematic diagram of an embodiment of the coil body in the magnetic resonance imaging assembly provided by the present invention; Figure 8 This is a schematic diagram of the matching circuit in the magnetic resonance imaging component provided by the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention 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 merely illustrative and not intended to limit the invention.

[0019] Please see Figure 1 and Figure 2 This invention provides a magnetic resonance imaging (MRI) assembly. This MRI assembly can be applied in MRI devices, such as those used in animal experiments. The MRI assembly can fix a coil assembly and adjust the relative position of the coil assembly to the scanning bed to secure the coil assembly in the desired position, facilitating MRI scanning.

[0020] In some embodiments, please refer to Figure 1 The magnetic resonance imaging assembly includes a scanning bed 100, a coil fixing device 200, and a coil assembly 300. The scanning bed is used to place the object 400 to be scanned. The coil fixing device 200 is detachably connected to the scanning bed 100, and the coil assembly 300 is detachably connected to the coil fixing device 200. The coil fixing device 200 can adjust the height and deflection angle of the coil assembly 300 relative to the scanning bed 100.

[0021] In this embodiment, a coil fixing device 200 is provided in the magnetic resonance imaging assembly. The coil is fixed by the coil fixing device 200, eliminating the need to stick the coil to the scanning area of ​​the object to be scanned with tape. The fixing method is better and can ensure the consistency of each scan. In addition, the coil fixing device 200 can also adjust the height and deflection angle of the coil assembly 300 relative to the scanning bed 100, thereby allowing the position of the coil assembly 300 to be adjusted during scanning, which provides convenience for magnetic resonance imaging scanning.

[0022] In some embodiments, the scanning bed 100 has a chamber for placing the object to be scanned 400. During scanning, the object to be scanned 400 lies in the chamber, and the coil assembly 300 is located above the chamber, thereby enabling the scanning of the object to be scanned 400.

[0023] Understandably, the objects to be scanned here can be animals, such as mice, dogs, monkeys, rabbits, etc.

[0024] In some embodiments, please refer to Figures 1 to 5 The coil fixing device 200 includes a coil fixing mechanism 210, a first adjusting mechanism 220, and a second adjusting mechanism 230. The coil fixing mechanism 210 is detachably connected to the coil assembly 300. The first adjusting mechanism 220 is connected to the coil fixing mechanism 210 and is used to adjust the height and deflection angle of the coil fixing mechanism 210 relative to the scanning bed 100. The second adjusting mechanism 230 is connected to the first adjusting mechanism 220 and is used to adjust the position of the first adjusting mechanism 220 mounted on the scanning bed 100.

[0025] In this embodiment, the coil fixing device 200 includes a coil fixing mechanism 210, a first adjusting mechanism 220, and a second adjusting mechanism 230. The coil fixing mechanism 210 can fix the coil assembly 300, thereby ensuring the firmness of the coil assembly 300. The first adjusting mechanism 220 can adjust the height and angle of the coil fixing mechanism 210 relative to the scanning bed 100. The second adjusting mechanism 230 can adjust the position of the first adjusting mechanism 220 installed on the scanning bed 100. Thus, several positions of the coil assembly 300 can be adjusted according to imaging requirements. It has a wide range of applications, can ensure the consistency of each scan, and provides convenience for magnetic resonance imaging scanning.

[0026] In some embodiments, the first adjustment mechanism 220 is also used to adjust the position of the coil fixing mechanism 210 relative to the scanning bed 100 in the width direction.

[0027] In this embodiment, to increase the adjustment range of the coil position, the first adjustment mechanism 220 also has a position adjustment function in the width direction, such as... Figure 1 As shown, the position adjustment in the width direction is... Figure 1 The left-right position adjustment shown allows the coil fixing device 100 to adjust the coil in several positions, such as forward and backward, left and right, up and down, and rotation, thus facilitating magnetic resonance imaging scanning.

[0028] In some embodiments, please refer to Figures 1 to 5 The coil fixing mechanism 210 includes a coil fixing frame 211 and a mounting base 212. The coil fixing frame 211 is detachably connected to the coil assembly 300. The mounting base 212 is connected to the coil fixing frame 211. The mounting base 212 has a mounting part connected to the first adjustment mechanism 220. The first adjustment mechanism 220 can adjust the position of the mounting part mounted on the first adjustment mechanism 220.

[0029] In this embodiment, the coil holder 211 can fix the coil assembly 300 and is connected to the first adjustment mechanism 220 through the mounting part on the mounting base 212. In order to adjust the position of the coil assembly 300, the first adjustment mechanism 220 can adjust the mounting position of the mounting part, thereby changing the fixed position of the coil assembly 300 and achieving the purpose of adjusting the position of the coil assembly 300. For example, when magnetic resonance imaging is required, the coil assembly 300 is first fixed on the coil holder 211, and then the mounting part of the mounting base 212 is installed on the first adjustment mechanism 220. In order to obtain a suitable position and angle, the position of the mounting part on the first adjustment mechanism 220 can be adjusted to adjust the position of the coil assembly 300 so that the coverage area of ​​the coil assembly 300 is located on the part of the animal of interest.

[0030] In some embodiments, a coil conformal space (not shown in the figure) is provided below the coil holder 211, and the coil assembly 300 is embedded in the coil conformal space.

[0031] In this embodiment, to achieve stable installation of the coil assembly 300, the coil mounting bracket 211 has a coil conformal space for mounting the coil assembly 300. Exemplarily, the coil conformal space is a cavity structure that matches the outer shell of the coil assembly 300. One side of the coil mounting bracket 211 has a threaded hole that communicates with the cavity structure. After the outer shell of the coil assembly 300 is embedded into the coil conformal space, a screw 2111 can be screwed into the threaded hole to abut against the outer shell of the coil assembly 300, thereby fixing the coil assembly 300 within the coil conformal space. When it is necessary to remove the coil assembly 300, simply loosen the screw 2111 to remove the coil assembly 300 from the coil conformal space, thus facilitating the replacement of the coil assembly 300 according to imaging requirements.

[0032] In some embodiments, please refer to Figures 1 to 5 The first adjustment mechanism 220 includes an adjustment frame 221, a first adjustment member 222, and a locking member 223. The adjustment frame 221 has an adjustment hole 221a and a mounting hole 221b. The adjustment hole 221a passes through the adjustment frame 221 in a first direction and extends along the extension direction of the adjustment frame 221. The mounting hole 221b passes through the adjustment frame 221 in a second direction and extends along the extension direction of the adjustment frame 221. The first direction is the length direction of the scanning bed 100, and the second direction is the height direction of the scanning bed 100. The length direction of the scanning bed 100 is the direction in which the scanning bed 100 enters and exits the scanning cavity. The mounting part is disposed in the mounting hole 221b. The first adjustment member 222 is disposed in the adjustment hole 221a and passes through the mounting part before being connected to the locking member 223.

[0033] For ease of explanation, the first direction will be used below. Figure 1 The front-back direction and the second direction shown are Figure 1 The vertical direction and the extension direction of the adjustment frame 221 are shown. Figure 1 The left and right directions shown are used as an example for explanation.

[0034] In this embodiment, the first adjustment mechanism 220 is used to adjust the vertical position, horizontal position, and deflection angle of the coil assembly 300. Specifically, since the coil assembly 300 is connected to the mounting part via the coil fixing bracket 211, the position of the coil assembly 300 can be adjusted by adjusting the position of the mounting part. When adjusting the position of the coil assembly 300, the mounting part is movably disposed within the mounting hole 221b. When it is necessary to adjust the position of the coil assembly 300, the horizontal position of the coil assembly 300 can be adjusted by adjusting the horizontal position of the mounting part within the mounting hole 221b. If the mounting hole 221b is an arc-shaped hole, the vertical position of the coil assembly 300 can be adjusted simultaneously with the horizontal position adjustment. Furthermore, the vertical position of the coil assembly 300 can also be adjusted by adjusting the position of the first adjusting member 222 passing through the mounting part. When it is necessary to adjust the deflection angle of the coil assembly 300, the mounting part can be rotated within the mounting hole 221b, thereby changing the deflection angle of the coil assembly 300.

[0035] Once the position of the mounting part is adjusted, it can be fixed in the mounting hole 221b by the first adjusting member 222 and the locking member 223. In some embodiments, the first adjusting member 222 can be driven to move, causing the first adjusting member 222 to move the locking member 223 in the through direction of the adjusting hole 221a (i.e., Figure 1 The device moves in the forward and backward direction (as shown), thereby locking the mounting part in the mounting hole 221b through the locking member 223, thus achieving the purpose of fixing the mounting part.

[0036] Of course, the present invention is not limited to locking the mounting part in the above manner. In other embodiments, other methods can be used to fix the mounting part. For example, the first adjusting member 222 can be used as a bolt and the locking member 223 can be used as a nut. The first adjusting member 222 can pass through the mounting part and be fixed to the mounting part. Then, after being locked by the nut, the mounting part is fixed in the mounting hole 221b. As long as the installation method and connection method of the first adjusting member 222 and the locking member 223 that can fix or loosen the mounting part can be used in the technical solution of the present invention.

[0037] In some embodiments, the first adjusting member 222 is a screw, the locking member 223 is a slider, the outer wall of the slider abuts against the inner wall of the adjusting hole 221a to restrict the rotation of the slider by the inner wall of the adjusting hole 221a, the screw passes through the mounting part and is threadedly connected to the slider, the rotational movement of the screw can be converted into the linear movement of the slider in the adjusting hole 221a, so that the slider presses the mounting part against the side wall of the adjusting hole 221a or loosens the mounting part.

[0038] In this embodiment, the mounting part is locked or released by the cooperative movement of the first adjusting member 222 and the locking member 223. Specifically, the slider is restricted by the inner wall of the adjusting hole 221a and cannot slide, but it can slide along the through direction of the adjusting hole 221a (i.e., Figure 1 The slider moves linearly in the forward and backward direction (as shown). When it is necessary to fix the mounting part, the screw is turned. When the screw rotates, it will cause the slider connected to it by threads to rotate. At this time, due to the restriction of the adjustment hole 221a, the slider cannot rotate. Its rotation tendency is converted into linear movement of the slider in the adjustment hole 221a, which makes the slider move closer to the mounting part installed in the mounting hole 221b. As the slider moves, the slider gradually squeezes the mounting part, so that the mounting part is pressed against the side wall of the mounting hole 221b, thereby fixing the mounting part. When it is necessary to loosen the mounting part, the screw is turned in the opposite direction, which makes the slider move linearly in the opposite direction in the adjustment hole 221a, which makes the slider move away from the mounting part. When the slider is completely separated from the mounting part, the mounting part is released and can move in the mounting hole 221b. The mounting part is preferably a boss structure.

[0039] In some embodiments, the mounting portion has a strip-shaped hole a, which extends through the mounting portion in a first direction and extends in a second direction, and the first adjusting member 222 passes through the strip-shaped hole a in the first direction.

[0040] In this embodiment, the strip hole a opened in the mounting part can be passed through by the first adjusting member 222, and the strip hole a opened in the mounting part extends along the vertical direction. When the height of the mounting part inserted into the mounting hole 221b is adjusted vertically, the first adjusting member 222 passes through the strip hole a at different positions in the vertical direction, which can realize the vertical position adjustment of the mounting part, thereby achieving the purpose of adjusting the vertical position of the coil assembly 300.

[0041] In some embodiments, the adjustment frame 221 has an arc-shaped structure along its extension direction.

[0042] In this embodiment, the adjustment frame 221 is configured with an arc-shaped structure. Correspondingly, both the adjustment hole 221a and the mounting hole 221b are arc-shaped holes. Therefore, when adjusting the left and right positions of the coil assembly 300, the up and down positions of the coil assembly 300 can be adjusted accordingly. Specifically, when adjusting the up and down positions of the coil assembly 300, the position of the mounting part installed in the mounting hole 221b is adjusted. Due to the arc-shaped design of the mounting hole 221b, when the left and right positions of the mounting part in the mounting hole 221b change, its up and down positions will also change accordingly. In some embodiments, the adjustment frame 221 has a U-shaped structure.

[0043] In some embodiments, the second adjustment mechanism 230 includes a second adjustment member 231. A position adjustment hole 221c is formed on the adjustment frame 221. The position adjustment hole 221c is strip-shaped and extends through the adjustment frame 221 in a second direction and extends in a first direction. The second adjustment member 231 is used to fix the adjustment frame 221 on the scanning bed 100 after passing through the position adjustment hole 221c.

[0044] In this embodiment, the second adjustment mechanism 230 adjusts the front-to-back position of the coil assembly 300 by adjusting the front-to-back position of the adjustment frame 221 mounted on the scanning bed 100. Specifically, since the position adjustment hole 221c is along the first direction (i.e., Figure 1 Extending in the front-to-back direction (as shown), it provides ample space for the second adjusting member 231 to adjust its position. When the second adjusting member 231 passes through different positions of the position adjustment hole 221c, the position of the adjusting frame 221 mounted on the scanning bed 100 in the first direction can be adjusted accordingly, thereby achieving the purpose of adjusting the front-to-back position of the coil, which is simple and convenient. Preferably, the second adjusting member 231 is a screw. There are two position adjustment holes 221c and two adjusting members 231, respectively located on both sides of the adjusting frame 221.

[0045] In some embodiments, the coil assembly 300 can fit closely to the animal's brain and conform well to the animal's brain, thereby improving the quality of the magnetic resonance imaging image.

[0046] In some embodiments, please refer to Figure 6 The coil assembly 300 includes a coil body 310, a circuit structure 320, and a connecting portion 330. The coil body 310 includes a coil segment 311, which is elliptical in shape and has an opening 311a located at one end of the major axis of the elliptical structure. The connecting portion 330 is disposed at the opening 311a of the coil segment 311. The connecting portion 330 has a first end 330a and a second end 330b. The first end 330a of the connecting portion 330 connects to the coil segment 331, and the second end 330b connects to the circuit structure 320. The circuit structure 320 is detachably connected to the coil fixing device 200. In this embodiment, the connecting portion 330 is used to connect the coil body 310 and the circuit structure 320, and the specific structure of the connecting portion 330 is not limited.

[0047] In this embodiment, the coil segment 311 of the coil body 310 is configured as an elliptical structure, which allows it to conform well to the scanning area of ​​the object to be scanned (e.g., the head), achieving a close fit. Compared to a circular structure, this significantly improves the image signal-to-noise ratio. Furthermore, by configuring the coil segment 311 as an elliptical structure, the size in the coil head-to-feet direction is increased, moving the zero point of coil B1 (emission field) outside the scanning area. This ensures both an overall improved signal-to-noise ratio and addresses the impact of the B1 zero point on image quality.

[0048] In some embodiments, please continue reading Figure 6 The first end 330a of the connecting part 330 is on the same plane as the elliptical structure, and the second end 330b of the connecting part 330 is at a certain distance from the reference plane, which is the plane where the elliptical structure is located. When the reference plane is on a horizontal plane, the second end 330b of the connecting part 330 has a height difference with the reference plane.

[0049] In this embodiment, the first end 330a and the second end 330b of the connecting portion 330 form a stepped structure, creating a height difference between them. This height difference is designed to accommodate the thickness of the circuit structure 320 and the installation height of the coil assembly 300. Specifically, since the coil segment 311 is connected to the circuit structure 320 via the connecting portion 330, but the circuit structure 320 has a certain thickness, when the coil assembly 300 is placed on the animal's head, the thickness of the circuit structure 320 prevents the coil assembly 300 from fitting tightly against the animal's head, affecting the quality of the final scanned image. In this embodiment, the connecting portion 330, which connects the first end 330a of the coil segment 311 and the second end 330b of the circuit structure 320, is configured with a height difference. This height difference effectively counteracts the effect of the thickness of the circuit structure 320, allowing the coil assembly 300 to fit tightly against the animal's head, thereby greatly improving the image signal-to-noise ratio.

[0050] In some embodiments, the height difference is adapted to the thickness of the circuit structure 320, thereby better offsetting the effects of the circuit structure 320.

[0051] Preferably, the height difference is 1-10 mm, which is roughly equivalent to the thickness of the current circuit structure 320. Therefore, it can largely offset the impact of the thickness of the circuit structure 320. For example, a height difference of 8 mm can maximize the offsetting of the impact of the thickness of the circuit structure 320.

[0052] It should be understood that the embodiments of the present invention do not limit the size of the height difference, as long as it meets the effect of the thickness of the offset circuit structure 320 and the installation height requirements of the coil assembly 300. The specific value can be set according to the specific value of the circuit structure 320 and the installation height, etc.

[0053] In some embodiments, please continue reading Figure 6 and Figure 7 The connecting portion 330 includes an extension section 331 and a connecting section 332 connected to the extension section 331. A first end 330a is the end of the extension section 331 furthest from the connecting section 332, and a second end 330b is the end of the connecting section 332 furthest from the extension section 331. The connecting section 332 is parallel to the reference plane, and the extension section 331 has an angle with the reference plane. The angle between the extension section 331 and the reference plane can be 60°.

[0054] In this embodiment, the connecting portion 330 consists of two sections, including an extension section 331 and a connecting section 332. The extension section 331 extends upward so that the connecting section 332 and the reference plane where the elliptical structure is located form a height difference, thereby offsetting the influence of the thickness of the circuit structure 320.

[0055] In addition, there is an angle between the extension section 331 and the connecting section 332. Therefore, when the connecting part 330 is connected to the circuit structure 320, the circuit structure 320 will form a certain distance from the coil section 311 and will not intrude above the coil section 311, thereby avoiding interference between the circuit structure 320 and the animal's head and affecting the fit between the coil assembly 300 and the animal's head.

[0056] In some embodiments, the extension segment 331 and the connecting segment 332 form an obtuse angle, such that after the circuit structure 320 is connected to the connecting segment 332, it will be located away from the top of the coil segment 311, thereby avoiding interference between the circuit structure 320 and the animal's head. For example, the angle between the extension segment 331 and the connecting segment 332 is 120°.

[0057] Preferably, the extension segment 331 and the connecting segment 332 are integrally formed, and their connection part has a rounded transition shape, which facilitates processing and increases the stability of the connection. Similarly, the connection between one end of the extension segment 331 and the coil segment 311 also has a rounded transition shape.

[0058] In some embodiments, there are two connecting portions 330, and the opening 311a has a first opening end and a second opening end. The first ends of the two connecting portions 330 are respectively connected to the first opening end and the second opening end of the opening 311a, and the second ends of the two connecting portions 330 are both connected to the circuit structure 320.

[0059] In this embodiment, the first opening end and the second opening end are spaced apart or arranged opposite to each other to form an opening 311a. In order to realize the connection between the connecting part 330 and the coil segment 311, the number of connecting parts 330 is set to two. The two connecting parts 330 are respectively connected to the first opening end and the second opening end, so that the coil segment 311 can form a loop with the circuit structure 320 through the two connecting parts 330.

[0060] It should be noted that in this embodiment of the invention, the coil segment 311 and the connecting part 330 are preferably made of the same material, so as to avoid the signal received by the coil being affected. Moreover, for ease of processing, the coil segment 311 and the connecting part 330 can be integrally formed.

[0061] In some embodiments, the coil assembly 300 further includes a tuning capacitor 340, which is mounted on the coil segment 311 at the end opposite to the opening 311a. Specifically, the tuning capacitor 340 is mounted on the end of the elliptical structure opposite to the opening 311a, along the major axis of the elliptical structure.

[0062] In this embodiment, the uneven distribution of capacitance in a traditional coil leads to an uneven electric field distribution. When different loads are applied, the resonant frequency of the coil fluctuates significantly, resulting in a decrease in the signal-to-noise ratio. In this embodiment, the tuning capacitor 340 is placed outside the circuit structure 320. The elliptical structure evenly distributes the capacitance, thereby achieving a uniform electric field distribution. This reduces the coil resonant frequency shift caused by load changes, improves the overall signal-to-noise ratio, and avoids the problem of causing structural deformation in the animal's brain. The tuning capacitor 340 is a non-magnetic capacitor.

[0063] In some embodiments, please refer to Figure 8 The circuit structure 320 includes a circuit board (not shown in the figure) and a matching circuit 321 mounted on the circuit board. The two ends of the matching circuit 321 are respectively connected to the second ends 311b of the two connecting parts 330.

[0064] In this embodiment, the matching circuit 321 includes a tuning section and a switching section. The tuning section is used to match the coil segment 311 with the load, and the switching section is used to control the working state of the coil segment 311 so that the coil segment 311 is detuned or tuned. Specifically, in this embodiment, the surface coil is a receiving coil, and the switching section is used to detun the coil segment to avoid interference between the receiving coil and the transmitting coil when the transmitting coil is working.

[0065] The tuning section includes a matching capacitor Cm. The coil segment 311 is used to receive magnetic resonance signals. The matching capacitor Cm is used to match the coil segment 311 with the load. The capacitance value is generally determined according to the load and remains unchanged after being determined. One end of the matching capacitor Cm is connected to the second end 330b of a connection part 330, and the other end of the matching capacitor Cm is connected to the switching part.

[0066] The switching part includes a detuned capacitor Cd, a resonant inductor L, and a diode D. One end of the detuned capacitor Cd is connected to a matching capacitor Cm, and the other end of the detuned capacitor Cd is connected to the second terminal 330b of another connection part 330. One end of the resonant inductor L is connected to the other end of the detuned capacitor Cd, and the other end of the resonant inductor L is connected to the positive terminal of the diode D. The negative terminal of the diode D is connected to one end of the detuned capacitor Cd.

[0067] In this embodiment, when diode D is turned on, the detuned capacitor Cd is connected to the resonant inductor L, forming an LC parallel resonant circuit connected in series with coil segment 311. The LC parallel resonant circuit generates a very large impedance at resonance, causing coil segment 311 to be in an approximately open-circuit state, thus detuning coil segment 311. When the diode is turned off, coil segment 311 is not affected by the resonant inductor L and is in a tuning state.

[0068] In some embodiments, the matching circuit 321 further includes a coaxial cable 3211, which is connected between the coil segment 311 and the matching capacitor Cm. The coaxial cable 3211 can be transitioned from a low temperature environment to a normal temperature environment through a connector before being connected to the tuning section, thus avoiding any impact on signal transmission.

[0069] In some embodiments, the circuit structure 320 further includes a housing 322, in which the circuit board is mounted. The coil assembly 300 can be fixed to the coil holder 211 via the housing 322. Optionally, the housing 322 is detachably disposed within the coil conformal space of the coil holder 211. For example, the housing 322 is embedded within the coil conformal space. A screw 2111 is screwed into a threaded hole on one side of the coil holder 211 and abuts against the housing 322, fixing the housing 322 within the coil conformal space. Loosening the screw 2111 allows the housing 322 to be removed from the coil conformal space.

[0070] To better understand this invention, the following is combined with... Figures 1 to 8 The technical solution of the present invention will be described in detail below: First, the object to be scanned 400 can be placed on the scanning bed 100 and fixed, and other external devices can be connected to prepare for scanning. Then, the outer shell 322 of the coil assembly 300 is fixed in the coil conformal space of the coil holder 211. After that, the mounting part is placed in the mounting hole 221b, and the vertical position, horizontal position and deflection angle of the mounting part in the mounting hole 221b are adjusted. After the adjustment is completed, the first adjusting member 222 is rotated, so that the first adjusting member 222 drives the locking member 223 to move linearly in the adjusting hole 221a, so that the locking member 223 presses the mounting part against the side wall of the mounting hole 221b, thereby fixing the coil assembly 300. Then, the position of the second adjusting member 231 in the position adjustment hole 221c is adjusted so that the front and back position of the coil assembly 300 meets the requirements. Of course, the vertical position, horizontal position and deflection angle of the coil can also be readjusted according to the position of the object to be scanned 400 before subsequent scanning operations.

[0071] Therefore, the technical solution provided by the present invention enables the entire coil fixing device 200 to adjust the coil assembly 300 to any position to meet the requirements of magnetic resonance imaging and provide convenience for magnetic resonance imaging. Moreover, the fixing method of the outer shell 322 of the coil assembly 300 and the coil conformal space is better, which can ensure the consistency of each scan. In addition, by adjusting the height of the coil assembly 300 through the coil fixing device 200, interference can be avoided, resulting in better imaging effect.

[0072] In addition, by setting the coil segment 311 of the coil body 310 into an elliptical structure, it can conform well to the animal brain and achieve a close fit. Compared with a circular structure, it can greatly improve the image signal-to-noise ratio and solve the influence of the B1 zero point on image quality. By placing the tuning capacitor 340 outside the circuit structure 320, the elliptical structure distributes the capacitor evenly, thereby making the electric field distribution uniform, reducing the coil resonant frequency shift caused by load changes, improving the overall signal-to-noise ratio, and thus avoiding the problem of deformation of the animal brain structure.

[0073] Based on the aforementioned magnetic resonance imaging (MRI) component, the present invention also provides a corresponding MRI device, including a magnet (not shown in the figure) and the MRI component as described above. A scanning cavity is formed at the center of the magnet, and the MRI component can enter the scanning cavity. The MRI component can adjust the position of the coil assembly 300 within the scanning cavity to scan the object to be scanned at the desired angle and position. In some embodiments, the MRI device is a high-field (5T and above) MRI device; in some embodiments, the MRI device is an ultra-high-field (9.4T and above) MRI device. In some embodiments, the MRI device is an animal MRI device, and the coil assembly 300 is a single-loop coil used for animal MRI.

[0074] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A magnetic resonance imaging assembly, characterized in that, include: A scanning bed (100) is used to place the object to be scanned (400). A coil fixing device (200) is detachably connected to the scanning bed (100); and A coil assembly (300) is detachably connected to the coil fixing device (200); The coil fixing device (200) can adjust the height and deflection angle of the coil assembly (300) relative to the scanning bed (100); The coil fixing device (200) includes: A coil fixing mechanism (210) is detachably connected to the coil assembly (300); A first adjustment mechanism (220), connected to the coil fixing mechanism (210), is used to adjust the height and deflection angle of the coil fixing mechanism (210) relative to the scanning bed (100); and The second adjustment mechanism (230) is connected to the first adjustment mechanism (220) and is used to adjust the position of the first adjustment mechanism (220) mounted on the scanning bed (100); The coil fixing mechanism (210) includes a coil fixing frame (211) and a mounting base (212). The coil fixing frame (211) is detachably connected to the coil assembly (300). The mounting base (212) is connected to the coil fixing frame (211). The mounting base (212) has a mounting part connected to the first adjustment mechanism (220). The first adjustment mechanism (220) can adjust the position of the mounting part mounted on the first adjustment mechanism (220).

2. The magnetic resonance imaging assembly according to claim 1, characterized in that, The first adjustment mechanism (220) includes an adjustment frame (221), a first adjustment member (222), and a locking member (223). The adjustment frame (221) has an adjustment hole (221a) and a mounting hole (221b). The adjustment hole (221a) passes through the adjustment frame (221) in a first direction and extends along the extension direction of the adjustment frame (221). The mounting hole (221b) passes through the adjustment frame (221) in a second direction and extends along the extension direction of the adjustment frame (221). The first direction is the length direction of the scanning bed (100), and the second direction is the height direction of the scanning bed (100). The mounting part is disposed in the mounting hole (221b). The first adjustment member (222) is disposed in the adjustment hole (221a) and passes through the mounting part before being connected to the locking member (223).

3. The magnetic resonance imaging assembly according to claim 2, characterized in that, The first adjusting member (222) is a screw, and the locking member (223) is a slider. The outer wall of the slider abuts against the inner wall of the adjusting hole (221a) to restrict the rotation of the slider through the inner wall of the adjusting hole (221a). The screw passes through the mounting part and is threadedly connected to the slider.

4. The magnetic resonance imaging assembly according to claim 2, characterized in that, The second adjustment mechanism (230) includes a second adjustment member (231). A position adjustment hole (221c) is formed on the adjustment frame (221). The position adjustment hole (221c) is strip-shaped. The position adjustment hole (221c) passes through the adjustment frame (221) in a second direction and extends in a first direction. The second adjustment member (231) is used to fix the adjustment frame (221) on the scanning bed (100) after passing through the position adjustment hole (221c).

5. The magnetic resonance imaging assembly according to claim 1, characterized in that, The coil assembly (300) includes a coil body (310), a circuit structure (320), and a connecting part (330). The coil body (310) includes a coil segment (311), which is an elliptical structure. The coil segment (311) has an opening (311a), which is located at one end of the major axis of the elliptical structure. The connecting part (330) is disposed at the opening (311a) of the coil segment (311). The connecting part (330) has a first end (330a) and a second end (330b). The first end (330a) of the connecting part (330) is connected to the coil segment (311), and the second end (330b) of the connecting part (330) is connected to the circuit structure (320). The circuit structure (320) is detachably connected to the coil fixing device (200).

6. The magnetic resonance imaging assembly according to claim 5, characterized in that, The first end (330a) of the connecting part (330) is on the same plane as the elliptical structure, and the second end (330b) of the connecting part (330) has a height difference with the reference plane, which is the plane where the elliptical structure is located.

7. The magnetic resonance imaging assembly according to claim 5, characterized in that, The coil assembly also includes a tuning capacitor (340) mounted on the coil segment (311) at the other end opposite the opening (311a).

8. The magnetic resonance imaging assembly according to claim 1, characterized in that, The coil holder (211) has a coil conformal space, and the coil assembly (300) has a housing (322) that matches the coil conformal space. The housing (322) is detachably disposed within the coil conformal space.

9. A magnetic resonance imaging device, characterized in that, Includes a magnet and a magnetic resonance imaging assembly as described in any one of claims 1-8, wherein a scanning cavity is formed at the center of the magnet, and the magnetic resonance imaging assembly is capable of entering the scanning cavity.

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