Radio frequency coil assembly for magnetic resonance scanning equipment and magnetic resonance scanning equipment

Abstract

The utility model relates to a radio frequency coil assembly for magnetic resonance scanning equipment and the magnetic resonance scanning equipment. The radio frequency coil assembly comprises a first coil structure and a second coil structure, the first coil structure can be worn on a scanning part of a detected object, and the size of the first coil structure can be matched with the size of the scanning part, so that the first coil structure is closer to and fits the scanning part, and magnetic resonance signals emitted by tissues can be received more efficiently; a higher image signal-to-noise ratio is obtained; the second coil structure is separated from the first coil structure and surrounds the outer side of the worn first coil structure, and a certain gap is formed between the second coil structure and the first coil structure, that is, the size of the second coil structure can be made to be larger, so that the device can adapt to detected objects with more body types, and the proportion of applicable people is increased; and moreover, the problem of claustrophobia of the detected object can be relieved, the comfort of the detected object is improved, and the use is more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the medical technology field, in particular to a radio frequency coil assembly for a magnetic resonance scanning device and the magnetic resonance scanning device. BACKGROUND

[0002] Medical imaging is a technology and process for obtaining internal tissue images of a human body or a part of a human body in a non-invasive manner for medical or medical research purposes, and has become an important medical diagnostic technology widely used for all human body parts. A magnetic resonance imaging system using medical imaging technology applies a magnetic field in a cylindrical measurement space in which a scanning object is located. Local coils are widely used in magnetic resonance imaging systems for receiving magnetic resonance signals, and local coils are arranged directly close to scanning objects, and have higher image signal-to-noise ratios than other acquisition devices for receiving magnetic resonance signals, such as body coils, which are spaced apart from scanning objects.

[0003] Taking an example of a local coil being combined as a head coil and applied to a head, in order to make the head coil applicable to most people, the cavity of the head coil for accommodating the head of the detected object cannot be too large, otherwise the image signal-to-noise ratio is poor when applied to a detected object with a smaller head, and the image quality will be reduced; and the cavity of the head coil for accommodating the head cannot be too small, otherwise the proportion of the applicable population will be reduced, and the use experience of scanning objects with claustrophobia will be affected, so that the existing magnetic resonance coil has the problem of inconvenient use. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a radio frequency coil assembly in view of the problem of inconvenient use of the existing magnetic resonance coil.

[0005] A radio frequency coil assembly for a magnetic resonance scanning device, the radio frequency coil assembly comprising:

[0006] a first coil structure, wearable on a scanning part of a detected object, the first coil structure being configured to receive a magnetic resonance signal of the scanning part;

[0007] a second coil structure, separately arranged from the first coil structure and surrounding an outer side of the first coil structure after being worn; the second coil structure being configured to acquire the magnetic resonance signal of the first coil structure in a coupling manner.

[0008] In one of the embodiments, the first coil structure comprises a flexible body; the scanning part wrapped by the flexible body is a head;

[0009] The shell of the second coil structure is made of a hard material, and the second coil structure is in the form of a helmet and carries the head.

[0010] In one of the embodiments, the first coil structure comprises a flexible body; the scanning part wrapped by the flexible body is a breast;

[0011] The shell of the second coil structure is made of a hard material, and has a supporting surface and a receiving cavity, the supporting surface being capable of supporting the detected object, and the receiving cavity being capable of receiving the breast after the first coil structure is worn.

[0012] In one of the embodiments, the first coil structure comprises a flexible body; the scanning part wrapped by the flexible body is an upper limb joint or a lower limb joint;

[0013] The second coil structure is in a cylindrical shape, and along the axial direction of the cylindrical shape, the size of the first coil structure is smaller than the size of the second coil structure.

[0014] In one of the embodiments, the first coil structure comprises a plurality of first coil modules, and the plurality of first coil modules are sequentially spliced to form a wearable coil structure in a cylindrical shape, wherein two adjacent first coil modules have an overlapping area.

[0015] In one of the embodiments, the first coil structure is in the shape of a boot when worn, and correspondingly, the second coil structure is an ankle coil having at least a partial hard shell; or,

[0016] The first coil structure is in the shape of a scapula when worn, and correspondingly, the second coil structure is a shoulder coil having at least a partial hard shell.

[0017] In one of the embodiments, the radio frequency coil assembly further comprises a cable, one end of the cable being electrically connected with the second coil structure;

[0018] The cable is connectable to an external transmission interface, and the second coil structure is connected with a receiver through the transmission interface.

[0019] A magnetic resonance scanning device, comprising a patient bed and a radio frequency coil assembly, the radio frequency coil assembly comprising:

[0020] A first coil structure having a flexible body and being wearable on a scanning part of a detected object, the patient bed being capable of carrying the detected object;

[0021] A second coil structure being arranged on the patient bed, the second coil structure being capable of covering or wrapping the corresponding scanning part of the first coil structure; and the second coil structure being capable of being coupled with the first coil structure.

[0022] In one of the embodiments, the magnetic resonance scanning device further comprises:

[0023] a receiver integrated in the patient bed or arranged separately from the patient bed, the transmission interface of the patient bed being connected to the receiver;

[0024] The second coil structure is connected to the transmission interface of the patient bed through a transmission cable to transmit the magnetic resonance signals received by the second coil structure to the receiver.

[0025] In one of the embodiments, the magnetic resonance scanning device further comprises:

[0026] a receiver integrated in the patient bed;

[0027] The second coil structure transmits the received magnetic resonance signals to the receiver in a wireless manner.

[0028] The above-mentioned radio frequency coil assembly comprises a first coil structure and a second coil structure. The first coil structure can be worn on the scanning part of the detected object, and the size of the first coil structure can be adapted to the size of the scanning part, so as to be closer to and fit the scanning part, thereby being able to more efficiently receive the magnetic resonance signals emitted by the tissue and obtain a higher image signal-to-noise ratio. The second coil structure is arranged separately from the first coil structure and surrounds the outside of the first coil structure after being worn, and has a certain gap with the first coil structure, that is, the size of the second coil structure can be larger. Not only can the second coil structure adapt to more body types of the detected object and improve the proportion of the applicable population, but also can relieve the claustrophobia problem of the detected object and improve the comfort of the detected object, thereby being more convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A schematic diagram of the radio frequency coil assembly provided by the first embodiment of the present application.

[0030] Figure 2 A schematic diagram of the radio frequency coil assembly provided by the first embodiment of the present application. Figure 1

[0031] A schematic diagram of the radio frequency coil assembly provided by the first embodiment of the present application. Figure 3 Figure 1 A schematic diagram of the radio frequency coil assembly provided by the first embodiment of the present application.

[0032] Figure 4 A schematic diagram of the radio frequency coil assembly provided by the first embodiment of the present application.

[0033] Figure 5 Figure 4 A schematic diagram of the radio frequency coil assembly provided by the first embodiment of the present application.

[0034] Figure 6 A schematic diagram of the radio frequency coil assembly provided by the first embodiment of the present application. Figure 4

[0035] A schematic diagram of the radio frequency coil assembly provided by the first embodiment of the present application.​​Figure 7 A schematic diagram of a radio frequency coil assembly according to a third embodiment of the present application.

[0036] Figure 8 A schematic diagram of a radio frequency coil assembly according to a third embodiment of the present application. Figure 7 A schematic diagram of a radio frequency coil assembly according to a third embodiment of the present application.

[0037] Figure 9 A schematic diagram of a radio frequency coil assembly according to a third embodiment of the present application. Figure 7 A schematic diagram of a radio frequency coil assembly according to a third embodiment of the present application.

[0038] Figure 10 A schematic diagram of a first coil module in a radio frequency coil assembly according to a fourth embodiment of the present application.

[0039] Figure 11 A schematic diagram of a first coil structure in a radio frequency coil assembly according to a fourth embodiment of the present application. Figure 10 A schematic diagram of a first coil structure in a radio frequency coil assembly according to a fourth embodiment of the present application.

[0040] Figure 12A An equivalent circuit diagram of a first coil unit included in a first coil structure according to an embodiment of the present application.

[0041] Figure 12B A schematic diagram of an observation result according to an embodiment of the present application. Figure 12A A schematic diagram of an observation result according to an embodiment of the present application.

[0042] Figure 12C An equivalent circuit diagram of a second coil unit included in a second coil structure according to an embodiment of the present application.

[0043] Figure 12D A schematic diagram of an observation curve according to an embodiment of the present application. Figure 12C A schematic diagram of an observation curve according to an embodiment of the present application. A schematic diagram of an observation curve according to an embodiment of the present application.

[0044] A schematic diagram of an observation curve according to an embodiment of the present application. Figure 12E A schematic diagram of an observation curve according to an embodiment of the present application.

[0045] Figure 13A An equivalent circuit diagram of a second coil unit included in a first coil structure according to another embodiment of the present application.

[0046] Reference signs: 110, first coil structure; 111, first accommodating cavity; 112, first coil unit; 113, first coil module; 114, overlapping region; 120, second coil structure; 121, gap; 122, second coil unit; 1000, object to be detected. DETAILED DESCRIPTION

[0047] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by one of ordinary skill in the art without departing from the spirit and scope of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application. It should be understood that the use of the terms "include", "comprise" or "contain" herein should not be understood as limiting the present application to the features or steps described herein, but rather the use of these terms is intended to cover the presence of the features or steps described herein as well as the presence of other features or steps not described herein.

[0048] In the description of the present application, it should be understood that, if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0049] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can include at least one of the features explicitly or implicitly. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0050] In the present application, unless otherwise specifically defined and limited, if the terms "mount", "connect", "connect", "fix" and the like appear, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In the present application, unless specifically defined and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0052] It should be noted that if an element is referred to as being "fixed" or "set" to another element, it can be directly on the other element or there can be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.

[0053] Referring to Figure 1 As shown in the drawings, the radio frequency coil assembly provided by an embodiment of the present application is used in a magnetic resonance scanning device, and the radio frequency coil assembly includes a first coil structure 110 and a second coil structure 120. The first coil structure 110 is wearable on a scanning part of a detected object, that is, the first coil structure 110 is provided with a first accommodating cavity 111, the size of the first accommodating cavity 111 is capable of adapting to the scanning part of the detected object 1000, that is, the cavity wall of the first accommodating cavity 111 is capable of being connected in close contact with the scanning part, and the first coil structure 110 is used to receive a magnetic resonance signal from the scanning part. The second coil structure 120 is separately provided from the first coil structure 110 and surrounds the outside of the first coil structure 110 after being worn, that is, the first coil structure 110 is located in a three-dimensional space formed by the second coil structure 120, and the second coil structure 120 has a gap 121 with the first coil structure 110. The second coil structure 120 acquires the magnetic resonance signal of the first coil structure 110 in a coupling manner, for example, the second coil structure 120 and the first coil structure 110 are coupled to acquire the magnetic resonance signal received by the first coil structure 110 in a magnetic field coupling manner.

[0054] The first coil structure 110 can be worn on the scanning part of the detected object, and its size can be adapted to the size of the scanning part, so as to be closer to and fit the scanning part, thereby being able to more efficiently receive the magnetic resonance signals emitted by the tissues, and the second coil structure 120 acquires the magnetic resonance signals of the first coil structure 110 in a coupling manner, thereby being able to improve the penetration depth of the radio frequency coil assembly and obtain a higher image signal-to-noise ratio, and achieve a better scanning effect; the second coil structure 120 is separately arranged from the first coil structure 110; after the first coil structure 110 is worn by the detected object, the second coil structure 120 is arranged outside the first coil structure 110 and has a certain gap 121 with the first coil structure 110, that is, the size of the second coil structure 120 can be larger, which not only can adapt to more body types of the detected object 1000 and improve the proportion of the applicable population, but also can alleviate the problem of claustrophobia of the detected object 1000 and improve the comfort of the detected object 1000, and is more convenient to use.

[0055] As shown in Figure 1 one of the embodiments, the first coil structure 110 is arranged in a wearable manner in the second coil structure 120. The first coil structure 110 has no cable connection, the second coil structure 120 acquires the magnetic resonance signals of the first coil structure 110 in a coupling manner, and after being amplified by an amplifier (such as a low-noise amplifier or a preamplifier), is connected to a receiver or a coil channel selector through a cable or a connector.

[0056] As shown in Figure 4 one of the embodiments, the first coil structure 110 includes a plurality of first coil units 112 arranged in an array to form a coil array; wherein two adjacent first coil units 112 overlap each other, which is beneficial to improve the coverage effect of the coil units, so that the entire first coil structure 110 can receive the nuclear magnetic resonance signals in all tissues of the scanning part.

[0057] Further, as shown in Figure 4 the second coil structure 120 includes a plurality of second coil units 122 arranged in an array to form a coil array; each first coil unit 112 is arranged in one-to-one correspondence with one second coil unit 122. That is, the coil density of the first coil unit 112 is the same as the coil density of the second coil unit 122, so that the first coil unit 112 and the second coil unit 122 have a certain magnetic coupling, and the coupling interference between the plurality of adjacent and next adjacent first coil units 112 belonging to the first coil structure 110 is reduced, and the coupling interference between the plurality of adjacent and next adjacent second coil units 122 belonging to the second coil structure 120 is reduced.

[0058] like Figure 12A As shown, in one embodiment, when the first coil unit 112 and the second coil unit 122 are arranged in a one-to-one correspondence, the first coil unit 112 has no preamplifier, and the tuning circuit uses passive detuning mode to control the second coil unit 122 to tune to the system frequency, wherein: C14 is the equivalent capacitance of the first coil unit 112; C11 is the tuning capacitor; C13 is the matching capacitor; C12, L11, and two forward and reverse diodes constitute the passive detuning circuit. Figure 12B As shown, by using the dual-pickup method, the resonant frequency of the first coil unit 112 can be detected as the system frequency f0 of the magnetic resonance scanning device.

[0059] like Figure 12C As shown, in one embodiment, the second coil unit 122 is connected to the preamplifier via a transmission cable, and the tuning circuit uses an active detuning method to control the second coil unit 122 to tune to the system frequency. Wherein: C23 is the equivalent capacitance of the second coil unit 122; C21 is the tuning capacitor; C22, the inductor connected to it, and the diode constitute the active detuning circuit; the second coil unit 122 is located at the equivalent impedance Z of the preamplifier. in Preamplifier Z that meets the requirements of connection via transmission cable preamp Noise matching requirements. For example... Figure 12D As shown, using a dual-pickup method, the resonant frequency of the second coil unit 122 can be detected as the system frequency f0 of the magnetic resonance scanning device. Figure 12E As shown, in another embodiment, the second coil unit 122, which is not connected to the preamplifier, will have a frequency offset relative to the system frequency f0.

[0060] In one embodiment, the first coil unit 112 and the second coil unit 122 have an inductive coupling relationship. Specifically, each second coil unit 122 is located in the extension direction of the magnetic field lines of the corresponding first coil unit 112, so that the first coil unit 112 and the second coil unit 122 have very strong magnetic coupling, thereby reducing the coupling between two adjacent first coil units 112. The operating frequency of the first coil structure 110 is consistent with the Larmor frequency of the magnetic resonance scanning device. When the second coil structure 120 is adjusted individually, by changing the inductance or capacitance of the second coil unit 122, the operating frequency of the second coil structure 120 can be made to deviate from the Larmor frequency. Therefore, when the first coil structure 110 and the second coil structure 120 are coupled, the coupling interference between different coil units belonging to the same coil structure can be reduced.

[0061] like Figure 13AAs shown, in one embodiment, when the first coil unit 112 and the second coil unit 122 are not arranged in a one-to-one correspondence, the second coil unit 122 is connected to a matching network and then to a preamplifier, and the tuning circuit uses an active detuning method to control the second coil unit 122 to tune to the system frequency. Wherein: C33 is the equivalent capacitance of the second coil unit 122; C31 is the tuning capacitor; C32, the inductor connected to it, and the diode form an active detuning circuit; Cm is the matching capacitor; the second coil unit 122 and the matching network are connected at the equivalent impedance Z of the preamplifier. in Satisfy the Z of the preamplifier preamp Noise matching requirements.

[0062] like Figure 4 As shown, in one embodiment, the gap 121 between the second coil unit 122 and the corresponding first coil unit 112 is not greater than the outer diameter of the first coil unit 112. Specifically, the gap 121 between the second coil unit 122 and the corresponding first coil unit 112 is greater than 1.5 cm. If the gap 121 between the second coil unit 122 and the corresponding first coil unit 112 is too small, it will cause coupling interference between the coil units belonging to the same coil structure and the first coil unit 112. At the same time, if the gap 121 between the second coil unit 122 and the corresponding first coil unit 112 is too large, it will also cause the second coil unit 122 to deviate from the magnetic field of the first coil unit 112, resulting in a weakening of the magnetic coupling between the two. Therefore, by setting the gap 121 between the second coil unit 122 and the first coil unit 112 to be no greater than the outer diameter of the first coil unit 112, the coupling effect between the two is ensured.

[0063] In one embodiment, the first coil structure 110 further includes a first detuning circuit (not shown) for detuning control of the first coil unit 112. This first detuning circuit can be a passive detuning circuit. The passive detuning circuit resonates at a specific frequency by selecting appropriate inductance and capacitance values. When radio frequency signal transmission or reception is not required, the frequency of the radio frequency signal is the same as or close to the resonant frequency of the passive detuning circuit, automatically putting the circuit in a detuned state. In the detuned state, the impedance of the radio frequency circuit becomes very high, effectively isolating it from the system and reducing electromagnetic interference. When radio frequency signal transmission or reception is required, the frequency of the radio frequency signal differs from the resonant frequency of the passive detuning circuit, restoring the circuit to normal operation. In the restored state, the impedance of the radio frequency circuit returns to its normal value, ensuring effective signal transmission and reception.

[0064] Further, the second coil structure 120 further comprises a second detuning circuit for detuning control of the second coil unit 122, which can be an active detuning circuit and / or a passive detuning circuit. The first and second detuning circuits eliminate the influence of the radio frequency coil assembly on the B1+ field (radio frequency transmission field) of the volume transmission coil. The active detuning circuit usually contains one or more electronic switches (such as PIN diodes, field effect tubes, etc.). The state of the switch is controlled by a controller (such as a microprocessor or an application specific integrated circuit), which is opened or closed as needed. When radio frequency signal transmission or reception is not needed, the controller opens the switch, so that the radio frequency circuit is in a detuned state. When radio frequency signal transmission or reception is needed, the controller closes the switch, so that the radio frequency circuit returns to a normal working state.

[0065] As shown in the drawings, Figure 1 In one embodiment, since the first coil structure 110 and the second coil structure 120 are separately arranged, different sizes of the first coil structure 110 can be replaced according to the body size of the scanning object, so that the first coil structure 110 can be attached to the scanning part to obtain a higher image signal-to-noise ratio and achieve a better scanning effect.

[0066] In one embodiment, the radio frequency coil assembly further comprises a cable, one end of the cable being electrically connected to the second coil structure 120; and the radio frequency coil assembly further comprises an external amplifier, the other end of the cable being electrically connected to the amplifier. In other embodiments, the amplifier can also be built-in on the patient bed of the magnetic resonance scanning device.

[0067] In another embodiment, the patient bed of the magnetic resonance scanning device is provided with a transmission interface; the magnetic resonance scanning device further comprises a receiver, the transmission interface being connected to the receiver; and the second coil structure 120 is connected to the transmission interface through a transmission cable to transmit the magnetic resonance signals received by the second coil structure 120 to the receiver. Optionally, the receiver can be integrated in the patient bed, and the second coil structure 120 can be directly connected to the transmission interface through the transmission cable. Alternatively, the receiver is separately arranged from the patient bed, the second coil structure 120 is connected to the transmission interface through the transmission cable, and further transmits the magnetic resonance signals received by the second coil structure 120 to the receiver through the transmission cable passing through the patient bed.

[0068] In yet another embodiment, the receiver can be integrated in the patient bed, and the second coil structure 120 is further connected with an amplifier, a filter, an analog-to-digital conversion circuit and a modulation and transmission unit, all of which can be integrated in the second coil structure 120, and the second coil structure 120 transmits the received magnetic resonance signals to the receiver in a wireless manner. Specifically,

[0069] The second coil structure 120 acquires the magnetic resonance signal in real time and transmits the magnetic resonance signal to an amplifier. The amplifier of the second coil structure 120 amplifies the coupled magnetic resonance signal and transmits the magnetic resonance signal to a filter. The filter filters the magnetic resonance signal and transmits the magnetic resonance signal to an analog-to-digital conversion circuit. The analog-to-digital conversion circuit performs analog-to-digital conversion to obtain a digital magnetic resonance signal. A modulated transmission unit modulates the digital magnetic resonance signal and wirelessly transmits the modulated signal;

[0070] Correspondingly, the receiver includes a wireless receiving module and a coherent demodulator. The wireless receiving module is configured to receive the modulated signal. The coherent demodulator is connected to the wireless receiving module and configured to receive the modulated signal and demodulate the modulated signal using a carrier to obtain a digital magnetic resonance signal. The coherent demodulator includes a band-pass filter, a mixer, a low-pass filter, and a carrier recovery unit. The band-pass filter is connected to the wireless receiving module and configured to receive the modulated signal and filter out interference in the modulated signal to obtain a filtered modulated signal. The carrier recovery unit is connected to the wireless receiving module and configured to receive the modulated signal and obtain a carrier according to the modulated signal. The mixer is connected to the band-pass filter and the carrier recovery unit and configured to receive the filtered modulated signal and the carrier and mix the filtered modulated signal and the carrier to obtain a mixed signal. The low-pass filter is connected to the first mixer and configured to receive the mixed signal and filter out high-frequency signals in the mixed signal to obtain the digital magnetic resonance signal.

[0071] As shown in FIG. 1, Figure 6 In one embodiment, the first coil structure 110 includes a flexible body and a flexible conductive wire arranged on the flexible body, and the conductive wire has stretchability, i.e., the first coil structure 110 is a wearable coil structure, which can adapt to scanning sites of various sizes or shapes, and the inner surface of the wearable coil structure can conform to the scanning site when the wearable coil structure is worn. In this way, the first coil structure 110 can be worn by the object 1000 to be detected on the relevant scanning site, and after entering the scanning room, only needs to lie on the hospital bed and connect the cable, which greatly reduces the complexity and time of positioning work and improves the efficiency of examination.

[0072] As shown in FIG. 1, Figure 10 and Figure 11As shown, in one of the embodiments, the first coil structure 110 includes a plurality of first coil modules 113, and the plurality of first coil modules 113 are sequentially spliced to enclose the cylindrical wearable coil structure. By changing the splicing number of the first coil modules 113, the size of the space enclosed by the first coil structure 110 can be changed to adapt to different sizes of the scanning site, so that the first coil structure 110 and the scanning site have better fitting effect, and the scanning imaging quality is improved. At the same time, the first coil structure 110 is made into different models of the first coil structure 110, so as to adapt to different sizes of the scanning site, thereby ensuring the imaging quality. Among them, the adjacent two first coil modules 113 have an overlapping area 114. In this way, it is beneficial to improve the coverage effect of the coil, so that the whole radio frequency coil assembly can receive the nuclear magnetic resonance signals in all tissues of the scanning site.

[0073] In yet another embodiment, the first coil structure 110 can also be a flexible coil structure, including a flexible body, and the first coil unit 112 is attached to the flexible body. The flexible body is made of a flexible and deformable material such as felt or PU, so that the first coil structure 110 can be unfolded into a planar structure for the detected object 1000 to wear; and after wearing, it can be wound into a cylindrical structure, which can better adhere to the scanning site during use, improving the use adaptability of the first coil structure 110. The first coil unit 112 in the first coil structure 110 is made of a flexible conductive wire, which is beneficial to improve the flexibility of the first coil structure 110.

[0074] As shown in the embodiment, Figures 1 to 3 In one of the embodiments, the wearable coil structure is in the shape of a helmet when worn, the flexible body of the first coil structure 110 wraps the head, and the shell of the second coil structure 120 is made of a hard material. The second coil structure 120 is in the shape of a helmet and bears the head.

[0075] In yet another embodiment, as shown in the embodiment, Figures 4 to 6 The wearable coil structure is in the shape of a cup when worn, the flexible body of the first coil structure 110 wraps the breast, and the shell of the second coil structure 120 is made of a hard material. The shell of the second coil structure 120 has a supporting surface and a receiving cavity. The supporting surface can support the detected object, and the receiving cavity can accommodate the breast after wearing the first coil structure 110.

[0076] As shown in the embodiment, Figures 7 to 9 In yet another embodiment, the wearable coil structure is in the shape of a cylinder when worn, the flexible body of the first coil structure 110 wraps the upper limb joint or the lower limb joint, and the second coil structure 120 is in the shape of a cylinder and along the axial direction of the cylinder. The size of the first coil structure 110 is smaller than the size of the second coil structure 120.

[0077] In other embodiments, the wearable coil structure may also be boot-shaped or shoulder-shaped when worn to better fit different scanning areas. For example, in one embodiment, the first coil structure 110 is boot-shaped when worn, and correspondingly, the second coil structure 120 is an ankle coil with a rigid shell.

[0078] Understandably, in another embodiment, the first coil structure 110 is scapular when worn, and correspondingly, the second coil structure 120 is a shoulder coil with a rigid shell.

[0079] like Figures 1 to 3 As shown, in one embodiment, the radio frequency coil assembly can be a head coil assembly. When it is a head coil assembly, the first coil structure 110 can be used with multiple wearable headband coils of different sizes, so that a higher image signal-to-noise ratio can be obtained when scanning heads of different sizes. At the same time, the size of the second coil structure 120 can be made very large, which can solve the problem of claustrophobia and improve the comfort of the subject 1000 being tested.

[0080] like Figures 4 to 6 As shown, in one embodiment, the radio frequency coil assembly can be a breast coil assembly. When used as a breast coil assembly, the first coil structure 110 can be used with wearable bras of multiple sizes, enabling higher image signal-to-noise ratios when scanning breasts of different sizes, and accommodating scanning of a wider range of people.

[0081] like Figures 7 to 9 As shown, in one embodiment, the radio frequency coil assembly can be a knee joint coil assembly. The second coil structure 120 is arranged outside the first coil structure 110. The second coil unit 122 and the first coil unit 112 are radially spaced apart, and the coverage area of ​​the second coil unit 122 is larger than that of the first coil unit 112; that is, the size of the first coil unit 112 is generally smaller than the size of the second coil unit 122. Understandably, in other embodiments, the radio frequency coil assembly can be an elbow joint coil assembly, a wrist joint coil assembly, or an ankle joint coil assembly, etc. When the radio frequency coil assembly is applied to scanning areas such as the knee joint, elbow joint, wrist joint, or ankle joint, the first coil structure 110 can be formed by splicing multiple first coil modules 113. By changing the number of spliced ​​first coil modules 113, the size of the space enclosed by the first coil structure 110 can be changed. Simultaneously, the first coil structure 110 can be manufactured in different models to adapt to different sizes of scanning areas, thereby ensuring imaging quality.

[0082] Further, an embodiment of the present application also provides a magnetic resonance scanning device, which comprises a bed (not shown in the figure), a scanner (not shown in the figure) and a radio frequency coil assembly. The bed is used to carry a detected object. The radio frequency coil assembly comprises a first coil structure 110 and a second coil structure 120. The first coil structure 110 has a flexible body and can be worn on a scanning part of the detected object. The bed can carry the detected object. The second coil structure 120 is carried on the bed and can cover or wrap the corresponding scanning part of the first coil structure 110. The second coil structure 120 can be coupled with the first coil structure 110, for example, the second coil structure 120 is coupled with the first coil structure 110 by a magnetic field coupling mode to acquire the magnetic resonance signal received by the first coil structure 110.

[0083] The scanner is used to perform a scanning imaging operation on the detected object. The scanner is formed with a second accommodating cavity (not shown in the figure) for accommodating the detected object to carry out the scanning imaging operation. The scanner is provided with a main magnet (not shown in the figure), a gradient coil (not shown in the figure) and a volume transmit coil (not shown in the figure). The main magnet can be composed of a superconducting coil and is used to generate a main magnetic field (B0 field). The gradient coil comprises an X gradient coil, a Y gradient coil and a Z gradient coil, which respectively generate an X direction gradient field, a Y direction gradient field and a Z direction gradient field for generating corresponding spatial encoding signals to spatially locate the magnetic resonance signal. The main magnet surrounds to form a detection space. The gradient coil is arranged in a gap formed by the main magnet. The volume transmit coil is arranged inside the detection space. That is, the main magnet, the gradient coil and the volume transmit coil jointly form the second accommodating cavity. The space contained in the second accommodating cavity is the detection space. The central part of the second accommodating cavity can correspond to the FOV region.

[0084] Specifically, the bed is coupled with the scanner. The bed can move out of or into the second accommodating cavity along the axial direction of the second accommodating cavity. The radio frequency coil assembly is arranged on the bed and can move into or out of the second accommodating cavity together with the bed. The radio frequency coil assembly is used to receive the magnetic resonance signal collected from the human body.

[0085] In one embodiment, the magnetic resonance scanning device comprises a receiver. The receiver is integrated in the bed or arranged separately from the bed. The transmission interface of the bed is connected with the receiver. The second coil structure 120 is connected to the transmission interface of the bed through a transmission cable to transmit the magnetic resonance signal received by the second coil structure 120 to the receiver.

[0086] In another embodiment, the receiver is integrated in the bed. The second coil structure 120 sends the received magnetic resonance signal to the receiver in a wireless manner.

[0087] The first coil structure in the radio frequency coil assembly can be sized to fit the size of the scanned part, so as to be closer to and fit the scanned part, thereby being able to more efficiently receive the magnetic resonance signals emitted by the tissue and obtain a higher image signal-to-noise ratio, and the claustrophobia of the detected object can be relieved, the comfort of the detected object is improved, and the use is more convenient.

[0088] The technical features of the above-described embodiments can be combined in any manner, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0089] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A radio frequency coil assembly for a magnetic resonance scanning apparatus, characterized by, The radio frequency coil assembly comprises: A first coil structure (110) wearable on a scanning part of a detected object, the first coil structure (110) being used for receiving a magnetic resonance signal of the scanning part; A second coil structure (120) separately arranged from the first coil structure (110) and surrounding an outer side of the first coil structure (110) after being worn; the second coil structure (120) acquires the magnetic resonance signal of the first coil structure (110) in a coupling manner.

2. The radio frequency coil assembly of claim 1, wherein, The first coil structure (110) comprises a flexible body; the scanning part wrapped by the flexible body is a head; The shell of the second coil structure (120) is made of hard material, the second coil structure (120) is in the shape of a helmet and bears the head.

3. The radio frequency coil assembly of claim 1, wherein, The first coil structure (110) comprises a flexible body; the scanning part wrapped by the flexible body is a breast; The shell of the second coil structure (120) is made of hard material, the shell of the second coil structure (120) has a supporting surface and a receiving cavity, the supporting surface is capable of supporting the detected object, and the receiving cavity is capable of receiving the breast after the first coil structure (110) is worn.

4. The radio frequency coil assembly of claim 1, wherein, The first coil structure (110) comprises a flexible body; the scanning part wrapped by the flexible body is an upper limb joint or a lower limb joint; The second coil structure (120) is in the shape of a cylinder, and along an axial direction of the cylinder, the size of the first coil structure (110) is smaller than the size of the second coil structure (120).

5. The radio frequency coil assembly of claim 4, wherein, The first coil structure (110) comprises a plurality of first coil modules (113), the plurality of first coil modules (113) are sequentially spliced to form a wearable coil structure in the shape of a cylinder, wherein two adjacent first coil modules (113) have an overlapping area (114).

6. The radio frequency coil assembly of claim 1, wherein, The first coil structure (110) is in the shape of a boot when being worn, and correspondingly, the second coil structure (120) is an ankle coil having at least a partial hard shell; or, The first coil structure (110) is in the shape of a scapula when being worn, and correspondingly, the second coil structure (120) is a shoulder coil having at least a partial hard shell.

7. The radio frequency coil assembly of claim 1, wherein, The radio frequency coil assembly further comprises a cable, one end of the cable being electrically connected with the second coil structure (120); The cable is capable of being plugged into an external transmission interface, and the second coil structure (120) is connected with a receiver through the transmission interface.

8. A magnetic resonance scanning apparatus comprising a couch and a radio frequency coil assembly, characterized in that, The radio frequency coil assembly comprises: A first coil structure (110) having a flexible body and wearable on a scanning part of a detected object, the bed being capable of bearing the detected object; A second coil structure (120) bearingly arranged on the bed, the second coil structure (120) being capable of covering or wrapping a corresponding scanning part of the first coil structure (110); the second coil structure (120) is capable of being coupled with the first coil structure (110).

9. The magnetic resonance scanning device of claim 8, characterized by Further comprising: A receiver integrated in the bed or separately arranged from the bed, a transmission interface of the bed being connected with the receiver; The second coil structure (120) is connected to a transmission interface of the patient bed by a transmission cable to transmit the magnetic resonance signals received by the second coil structure (120) to the receiver.

10. The magnetic resonance scanning device of claim 8, characterized by Further comprising: a receiver integrated in the patient bed; The second coil structure (120) transmits the received magnetic resonance signals to the receiver in a wireless manner.

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