Wireless transmission device and magnetic resonance imaging equipment

Abstract

The invention relates to a wireless transmission device for magnetic resonance imaging equipment and the magnetic resonance imaging equipment. The wireless transmission device comprises a transmitting coupler, the transmitting coupler comprises a transmitting coil array, the transmitting coil array comprises one or more first transmitting coils, and the transmitting coupler is arranged in a first local coil device located on an examination bed and located below an examination part of an examined body and used for transmitting a first intermediate frequency signal, the first intermediate frequency signal is generated based on a first magnetic resonance signal received from the subject by the first local coil device; the first receiving coupler comprises a first receiving coil array, the first receiving coil array comprises one or more first receiving coils and is located below the track of the examination couch sliding through the magnetic resonance main body, and the first receiving coil array is configured to respond to at least partial overlapping of the transmitting coil array and the first receiving coil array; a first intermediate frequency signal from the transmitting coil array is received.

Description

Technical Field

[0001] The present disclosure relates to the technical field of medical devices, and in particular to a wireless transmission device and a magnetic resonance imaging device. Background Art

[0002] In a magnetic resonance imaging (MRI) device, a local coil for receiving magnetic resonance signals emitted by an object is generally connected to a magnetic resonance control terminal through a cable and a connector, that is, the magnetic resonance signals received by the local coil are transmitted to the control terminal through the cable. However, signal transmission through cables has at least the following disadvantages: 1) the used trap (e.g., the trap under the examination bed) is usually very expensive; and 2) the used connector (e.g., the slot) is usually difficult to clean. Therefore, it is desirable to provide wireless transmission between the local coil and the magnetic resonance control terminal.

[0003] The methods described in this section are not necessarily methods that have been previously conceived or employed. Unless otherwise indicated, it should not be assumed that any method described in this section is considered to be prior art simply because it is included in this section. Similarly, unless otherwise indicated, the issues mentioned in this section should not be considered to have been recognized in any prior art. Summary of the invention

[0004] In view of this, the present disclosure proposes, on one hand, a wireless transmission device for a magnetic resonance imaging device, the wireless transmission device comprising: a transmitting coupler, comprising a transmitting coil array, the transmitting coil array comprising one or more first transmitting coils, arranged in a first local coil device located on an examination bed and below an examination site of an object, for transmitting a first intermediate frequency (IF) signal, wherein the first IF signal is generated based on a first magnetic resonance signal received by the first local coil device from the object; and a first receiving coupler, comprising a first receiving coil array, the first receiving coil array comprising one or more first receiving coils, located below a trajectory of the examination bed sliding across the magnetic resonance body, the first receiving coil array being configured to: receive the first IF signal from the transmitting coil array in response to the transmitting coil array at least partially overlapping the first receiving coil array.

[0005] Another aspect of the present disclosure provides a magnetic resonance imaging device, comprising: a magnetic resonance body; an examination bed; a wireless transmission device as described in the present disclosure; and a first local coil device, the first local coil device further comprising: a first magnetic resonance coil configured to detect a first magnetic resonance signal emitted by the subject; and a first frequency converter configured to convert the first magnetic resonance signal into a first IF signal.

[0006] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can better understand the above and other features and advantages of the present invention. In the accompanying drawings:

[0008] Figure 1 A structural diagram of a magnetic resonance imaging device according to an embodiment of the present disclosure is shown;

[0009] Figure 2 A structural diagram of a first receiving coupler in a wireless transmission device according to an embodiment of the present disclosure is shown;

[0010] Figure 3 A structural diagram of a transmission coupler in a wireless transmission device according to an embodiment of the present disclosure is shown;

[0011] Figure 4A-4B A schematic diagram showing wireless transmission between a first receiving coupler and a transmitting coupler according to an embodiment of the present disclosure is shown;

[0012] Figure 5 A schematic diagram showing first IF signal transmission in a wireless transmission device according to an embodiment of the present disclosure;

[0013] Figure 6 A structural diagram of a main-side transmission component in a wireless transmission device according to an embodiment of the present disclosure is shown;

[0014] Figure 7 A structural diagram of a second receiving coupler in a wireless transmission device according to an embodiment of the present disclosure is shown;

[0015] Figure 8 A structural diagram of a local coupler in a wireless transmission device according to an embodiment of the present disclosure is shown;

[0016] Fig. 9 A schematic diagram showing the transmission of a second IF signal in a wireless transmission device according to an embodiment of the present disclosure; and

[0017] Figures 10A-10C A schematic diagram showing an application scenario of operating a magnetic resonance imaging device according to an embodiment of the present disclosure.

[0018] The reference numerals are as follows:

[0019] 10 Magnetic resonance subject

[0020] 11 Field Magnets

[0021] 12 Gradient Coil

[0022] 13 Body Coil

[0023] 14 Magnetic resonance cavity

[0024] 20 Examination bed

[0025] 21 Local coupler

[0026] 21a Locally coupled coil array

[0027] 21b Coupling auxiliary coil

[0028] 30 Main body side transmission parts

[0029] 31 First receiving coupler

[0030] 31a First receiving coil array

[0031] 31b First receiving auxiliary coil

[0032] 32 Second receiving coupler

[0033] 32a Second receiving coil array

[0034] 32b Second receiving auxiliary coil

[0035] 40 First local coil device

[0036] 41 Transmitter coupler

[0037] 41a Transmitter Coil Array

[0038] 41b Transmitter auxiliary coil

[0039] 42 First frequency converter

[0040] 43. First MRI Coil

[0041] 50 Second local coil device

[0042] 51 Second frequency converter

[0043] 52 Second MRI coil

[0044] 60 Subjects

[0045] 70 Control Terminal

[0046] 80 Head Coil Device

[0047] 81a Head Transmit Coil Array

[0048] 81b Head Transmitter Auxiliary Coil

[0049] 90 Spinal Coil Device

[0050] 91a Spine Transmit Coil Array

[0051] 91b Spine Transmitter Auxiliary Coil DETAILED DESCRIPTION

[0052] In order to have a clearer understanding of the technical features, purposes and effects of the present disclosure, specific embodiments of the present disclosure are now described with reference to the accompanying drawings, in which the same reference numerals represent the same parts.

[0053] In this document, “exemplary” means “serving as an example, instance or illustration”, and any diagram or implementation described in this document as “exemplary” should not be interpreted as a more preferred or more advantageous technical solution.

[0054] In order to simplify the drawings, only the parts related to the present disclosure are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked.

[0055] In this article, "one" not only means "only one", but also means "more than one". In this article, "first", "second", etc. are only used to distinguish each other, rather than to indicate their importance and order, or the premise of each other's existence.

[0056] In a magnetic resonance imaging device, since the magnetic resonance signal emitted by the subject (e.g., a patient who needs to undergo a magnetic resonance examination) is very weak, it is usually necessary to arrange a receiving antenna (i.e., a local coil) as close as possible to the examination site of the subject, such as the head, neck, spine, thigh, calf, knee, ankle, foot, etc. In general, in order to transmit the magnetic resonance signal received by the local coil close to the subject to the control end of the magnetic resonance imaging device for further processing (e.g., generating a magnetic resonance image), the local coil needs to be connected to the control end of the magnetic resonance imaging device through a cable and a connector. For example, the local coil is first connected to a slot on an examination bed, and then the slot on the examination bed is connected to the control end of the resonance system through a cable. However, the radio frequency trap used by the cable is usually very expensive, and the slot on the examination bed is also difficult to clean.

[0057] In order to solve the above problems, the present disclosure provides a wireless transmission device for a magnetic resonance imaging device and a magnetic resonance imaging device.

[0058] According to an embodiment of the present disclosure, a magnetic resonance imaging apparatus includes: a magnetic resonance body; an examination bed; a wireless transmission device as described in the present disclosure; and a first local coil device, the first local coil device including: a first magnetic resonance coil configured to detect a first magnetic resonance signal emitted by an object; and a first frequency converter configured to convert the first magnetic resonance signal into a first intermediate frequency signal.

[0059] According to an embodiment of the present disclosure, a wireless transmission device includes: a transmitting coupler, including a transmitting coil array, the transmitting coil array includes one or more first transmitting coils, which is arranged in a first local coil device located on an examination bed and below an examination site of an object, and is used to transmit a first IF signal, wherein the first IF signal is generated based on a first magnetic resonance signal received by the first local coil device from the object; and a first receiving coupler, including a first receiving coil array, the first receiving coil array includes one or more first receiving coils, and is located below a trajectory of the examination bed sliding over a magnetic resonance body, the first receiving coil array being configured to: receive the first IF signal from the transmitting coil array in response to the transmitting coil array at least partially overlapping the first receiving coil array.

[0060] Figure 1 The magnetic resonance imaging apparatus 100 according to an embodiment of the present disclosure is shown. According to some embodiments, the magnetic resonance imaging apparatus 100 includes a magnetic resonance main body 10, an examination bed 20, a wireless transmission device and a first local coil device 40, wherein the wireless transmission device includes a main body side transmission component 30 located on the side of the magnetic resonance main body 10 and a transmission coupler 41 located on the side of the first local coil device 40 (at Figure 1 not shown).

[0061] According to some embodiments, a magnetic resonance cavity 14 is provided in the magnetic resonance body 10, allowing the examination bed 20 to slide into the magnetic resonance cavity 14, and the magnetic resonance cavity 14 extends through the magnetic resonance body 10 along the longitudinal direction y, wherein when the examination bed 20 carrying the subject 60 slides into the magnetic resonance cavity 14, magnetic resonance imaging of the subject 60 can be performed.

[0062] According to some embodiments, the magnetic resonance body 10 has a field magnet 11, which generates a static magnetic field for aligning the nuclear spins of the subject 60 in the imaging region. According to some embodiments, the imaging region of the magnetic resonance is the field of view (FOV) of the magnetic resonance, that is, the actual size of the image region in the frequency encoding direction and the phase encoding direction.

[0063] According to some embodiments, the magnetic resonance body 10 further has gradient coils 12 to superimpose variable magnetic fields in three spatial directions on the static magnetic field. According to some embodiments, the gradient coils 12 are typically coils made of ordinary wires that can generate mutually orthogonal fields.

[0064] According to some embodiments, the magnet unit 10 further has a body coil 13, which is configured to radiate a high-frequency signal input through a signal line into an examination volume, and receive a magnetic resonance signal emitted by the subject 60 and output the magnetic resonance signal through the signal line. According to some embodiments, the body coil 13 may be omitted and a local coil (e.g., Figure 1 A first local coil arrangement 40 in FIG.

[0065] According to some embodiments, the examination bed 20 can carry the subject 60 thereon and be driven to move along the longitudinal direction y and in the plane formed by the direction x and the direction y, so as to move the examination part of the subject 60 into the field of view of the magnetic resonance when examination is required, or to move the examination part of the subject 60 out of the field of view of the magnetic resonance when the examination is ended.

[0066] According to some embodiments, components of the wireless transmission device may be disposed on the magnetic resonance body 10 side and the first local coil device 40 side, respectively, to achieve wireless transmission between the magnetic resonance body 10 side and the first local coil device 40 side. According to some embodiments, the wireless transmission is signal transmission performed by wireless transmission technology, for example, wireless transmission performed by electromagnetic induction between coils as further described below. In the embodiments described in the present disclosure, by achieving wireless transmission between the magnetic resonance body 10 side and the first local coil device 40 side, there is no need to use cables for signal transmission, thereby avoiding the various defects of signal transmission through cables mentioned above.

[0067] According to some embodiments, the subject-side transmission component 30 of the wireless transmission device located on the side of the magnetic resonance subject 10 is arranged below the track where the examination bed 20 slides past the magnetic resonance subject 10, for example, Figure 1 As shown, the magnetic resonance device is disposed in the inner wall of the bottom of the magnetic resonance body 10, in the body coil 13, or can be used together with Figure 1 Unlike what is shown in FIG. 1 , the magnetic resonance body 10 is arranged above the inner wall of the bottom.

[0068] According to some embodiments, the parts of the main body-side transmission component 30 may be separately arranged at different positions. For example, as further described below, the first receiving coupler 31 of the wireless transmission device for wireless transmission with the first local coil device 40 is arranged in the magnetic resonance body 10, and the second receiving coupler 32 of the wireless transmission device for wireless transmission with the second local coil device 50 is arranged on the inner wall of the magnetic resonance body 10. For another example, the first receiving coupler 31 and the second receiving coupler 32 may both be arranged on the inner wall of the magnetic resonance body 10, but may be arranged on the plane on which the examination bed 20 moves (i.e., Figure 1Different positions on the plane formed by the x-axis and y-axis in the image.

[0069] According to some embodiments, the wireless transmission device includes a transmitting coupler 41 located in the first local coil device 40 and a first receiving coupler 31 located below the trajectory of the examination bed 20 sliding over the magnetic resonance body 10, and the transmitting coupler 41 performs wireless transmission with the first receiving coupler 31, for example, through electromagnetic induction. According to some embodiments, the first local coil device 40 is located on the examination bed 20 and below the examination site of the subject 60, so that the magnetic resonance signal from the examination site of the subject 60 is received during imaging, and an IF signal is generated based on the magnetic resonance signal. According to some embodiments, when imaging is performed, the transmitting coupler 41 located in the first local coil device 40 overlaps with the first receiving coupler 31, so that the IF signal is wirelessly transmitted. At this time, since the transmitting coupler 41 is in the first local coil device 40 located on the examination bed 20 and below the examination site of the subject 60, the wireless transmission distance between the transmitting coupler 41 and the first receiving coupler 31 is only 10000mW. Figure 1 The distance in the z-axis direction (ie, the direction perpendicular to the plane in which the bed moves) is approximately equal to the thickness of the examination bed 20.

[0070] According to some embodiments, the transmitting coupler includes a transmitting coil array, the transmitting coil array includes one or more first transmitting coils, and is arranged in a first local coil device located on the examination bed and below the examination site of the subject, for transmitting a first IF signal, wherein the first IF signal is generated based on a first magnetic resonance signal received by the first local coil device from the subject, and the first receiving coupler includes a first receiving coil array, including one or more first receiving coils, and is located below a trajectory of the examination bed sliding over the magnetic resonance body, and the first receiving coil array is configured to: in response to the transmitting coil array at least partially overlapping with the first receiving coil array, receive the first IF signal from the transmitting coil array. According to some embodiments, the first IF signal transmitted between the transmitting coil array of the first local coil device 40 and the first receiving coil array of the first receiving coupler of the wireless transmission device 30 may be one first IF signal at one IF frequency, or may be a plurality of first IF signals at a plurality of IF frequencies, for example, the first IF signal may include two IF signals at 8.6 MHz and 11.4 MHz, respectively. According to some embodiments, the number of transmitting coils in the transmitting coil array and the number of first receiving coils in the first receiving coil array may be associated with the number of IF frequencies corresponding to the first IF signal, wherein, when the number of IF frequencies corresponding to the first IF signal is greater, the number of transmitting coils in the transmitting coil array and the number of first receiving coils in the first receiving coil array are smaller.

[0071] According to some embodiments, the number of first receiving coils in the first receiving coil array is set to be greater than the number of transmitting coils in the transmitting coil array, so that the area occupied by the first receiving coil array is larger, and the transmitting coil array can transmit the first IF signal to the first receiving coil array when it is within a certain range (rather than at a specific position).

[0072] According to some embodiments, the “overlap” described in the present disclosure refers to the plane in which the examination bed 20 moves (ie, Figure 1 According to some embodiments, the "at least partially overlapping" in the present disclosure refers to the plane in which the examination bed 20 moves (i.e., Figure 1 The two axes may partially overlap or completely overlap in the plane formed by the x-axis and y-axis in the image.

[0073] According to some embodiments, the first receiving coil array overlaps with the FOV of the magnetic resonance subject, so that the local coil (eg, the first local imaging device 40 ) overlaps with the first receiving coil array when the first receiving coil array is imaged, thereby performing wireless transmission therebetween.

[0074] The following will combine Figure 2 and Figure 3 The first receiving coupler 31 and the transmitting coupler 41 in the wireless transmission device are described in more detail.

[0075] Figure 2 FIG. 4 shows a structural diagram of a first receiving coupler 31 in a wireless transmission device according to an embodiment of the present disclosure.

[0076] According to some embodiments, the first receiving coupler 31 includes a first receiving coil array 31a, and the first receiving coil array 31a includes one or more first receiving coils. According to some embodiments, when the first receiving coil array 31a includes a plurality of first receiving coils, the plurality of first receiving coils in the first receiving coil array 31a are arranged in a two-dimensional plane and are arranged in a plurality of rows and / or a plurality of columns, for example, Figure 2 As shown, the arrangement is 5 rows in the x-axis direction and 4 columns in the y-axis direction including (5x4)=20 coils. According to some embodiments, adjacent coils in the first receiving coil array are arranged to partially overlap to avoid strong coupling between adjacent coils. According to some embodiments, the first receiving coils in the first receiving coil array can be connected to the system through a preamplifier decoupling to avoid additional coupling due to induced currents in these first receiving coils.

[0077] According to some embodiments, the signal emitted by the subject 60 detected by the first local coil device 40 may be converted into an IF signal, and the IF signal may be transmitted as a first IF signal to the first receiving coil array 31a in the main body-side transmission part 30 of the wireless transmission device, for example, a frequency converter is provided for each antenna coil, and the frequency converter may be configured to convert the original signal at the Larmor frequency into an IF signal that does not interfere with the original signal. According to some embodiments, the frequency of the IF signal is lower than the frequency of the original signal emitted by the subject 60 detected. According to some embodiments, there may be a plurality of IF signals of different frequencies, for example, a first IF signal at 8.6 MHz and a second IF signal at 11.4 MHz.

[0078] According to some embodiments, more than one original signal may be modulated onto one IF signal, for example, two original signals may be modulated onto one IF signal. Figure 2 In the first receiving coil array shown, 4 x 5 = 20 IF channel signals can be received, corresponding to 40 original signals.

[0079] According to some embodiments, in order to ensure that the signal to noise ratio (SNR) of wireless transmission between the first receiving coupler 31 on the side of the magnetic resonance body 10 and the transmitting coupler 41 on the side of the first local coil device 40 is low, it should be ensured that the distance between the first receiving coil array 31a and the transmitting coil array 41a of the transmitting coupler 41 is less than half of the diameter of the first receiving coil array 31a during wireless transmission. For example, when the transmitting coil array 41a of the transmitting coupler 41 slides with the examination bed 20 to at least partially overlap with the first receiving coil array 31a, the distance between the transmitting coil array 41a and the first receiving coil array 31a is substantially the thickness of the examination bed 20. For example, for mechanical stability, the thickness of the examination bed 20 should be 5 cm, and therefore, the diameters of the coils in the transmitting coil array 41a and the first receiving coil array 31a are not less than 10 cm. Therefore, the SNR of wireless transmission can be ensured to be low by setting the diameter of the coil according to the distance between the transmitting coil array 41a and the first receiving coil array 31a. Furthermore, since the transmitting coil array 41a and the first receiving coil array 31a are already as close as possible during wireless transmission, that is, only the thickness of the examination bed, the coils in the transmitting coil array 41a and the first receiving coil array 31a do not need to be set too large, thereby reducing the size of the transmitting coil array 41a and the first receiving coil array 31a.

[0080] According to some embodiments, in the first local coil device 40, a local oscillator (LO) signal is required to mix the signal emitted by the subject 60. According to some embodiments, in order to provide a stable LO signal, the LO signal is generated on the side of the magnetic resonance body 10, and the LO signal is transmitted to the first local coil device 40 through a wireless transmission device. According to some embodiments, the power signal is wirelessly transmitted to the first local coil device 40 through the wireless transmission device, thereby simplifying the power supply component (for example, a battery for power supply) on the side of the first local coil device 40. According to some embodiments, the tuning control signal is wirelessly transmitted to the first local coil device 40 through the wireless transmission device, thereby realizing tuning or detuning of the first local coil device 40. According to some embodiments, the first local coil device 40 may be turned on or off by a tuning control signal. Specifically, the magnetic resonance coil in the first local coil device 40 is tuned to a specific high-frequency signal after receiving the tuning signal, thereby being activated to receive a signal returned from the subject. Furthermore, the magnetic resonance coil in the first local coil device 40 will no longer respond to the signal returned from the subject after receiving the detuning signal.

[0081] According to some embodiments, a corresponding first LO signal may be configured for each first IF signal, for example, for two first IF signals of 8.6 MHz and 11.4 MHz, two first LO signals of 55 MHz and 75 MHz may be configured. According to other embodiments, a common first LO signal may be configured for multiple first IF signals, for example, only one first LO signal is transmitted to the first local coil device 40 through a wireless transmission device, and the local coil device 40 may generate signals of more frequencies based on the first LO signal (for example, via a phase-locked loop or other components) to perform mixing corresponding to multiple first IF signals.

[0082] According to some embodiments, the first receiving coupler 31 further includes a first receiving auxiliary coil 31b, wherein the first receiving coil array 31a is disposed within the first receiving auxiliary coil 31b. According to some embodiments, the first receiving coil array 31a being disposed within the first receiving auxiliary coil 31b means that: on the plane of movement of the examination bed (i.e., the plane formed by the x-axis and the y-axis), the first receiving coil array 31a is within the range of the first receiving auxiliary coil 31b. According to some embodiments, the first receiving coil array 31a and the first receiving auxiliary coil 31b are disposed to be coplanar. According to some embodiments, the first receiving coil array 31a and the first receiving auxiliary coil 31b may also be disposed to be concentric. According to some embodiments, the first receiving auxiliary coil 31b should be large enough so that when the first local coil device 40 moves away from the FOV but is still close to the FOV, it can still receive the power signal and the tuning control signal and be controlled to be detuned.

[0083] According to some embodiments, the first reception auxiliary coil 31 b is configured to transmit at least one of a first power signal, a first tuning control signal, and a first LO signal.

[0084] According to some embodiments, in addition to the transmitting coil array 41a, the transmitting coupler 41 further includes a transmitting auxiliary coil 41b, wherein the transmitting coil array 41a is disposed within the transmitting auxiliary coil 41b. According to some embodiments, the transmitting coil array 41a is disposed within the transmitting auxiliary coil 41b, which means that on the plane of movement of the examination bed (i.e., the plane formed by the x-axis and the y-axis), the transmitting coil array 41a is within the range of the transmitting auxiliary coil 41b. According to some embodiments, the transmit coupler 41 is configured to perform at least one of the following: in response to the transmit auxiliary coil 41b at least partially overlapping with the first receive auxiliary coil 31b, the transmit auxiliary coil 41b receives at least one of the first power signal and the first tuning control signal from the first receive auxiliary coil 31b; and in response to the component for transmitting the first LO signal in the transmit coupler 41 at least partially overlapping with the first receive auxiliary coil 31b, the component for transmitting the first LO signal in the transmit coupler 41 receives the first LO signal from the first receive auxiliary coil 31b, wherein the component for transmitting the first LO signal in the transmit coupler 41 is the transmit coil array 41a or the transmit auxiliary coil 41b.

[0085] Figure 3 FIG. 4 is a structural diagram of a transmission coupler 41 in a wireless transmission device according to an embodiment of the present disclosure.

[0086] According to some embodiments, the transmitting coupler 41 includes a transmitting coil array 41a, and the transmitting coil array 41a includes one or more first transmitting coils. According to some embodiments, the arrangement of the first transmitting coils in the transmitting coil array 41a may be similar to the arrangement of the first receiving coils in the first receiving coil array 31a, but the difference is that the number of the first transmitting coils in the transmitting coil array 41a is less than the first receiving coils in the first receiving coil array 31a (for example, the number of rows and / or columns of the transmitting coil array 41a is less), so that the transmitting coil array 41a can perform wireless transmission without being precisely at a specific position, but can perform wireless transmission within a certain range.

[0087] According to some embodiments, the transmit coil array 41 a is configured to transmit the first IF signal to the first receive coil array 31 a in response to the transmit coil array 41 a at least partially overlapping the first receive coil array 31 a .

[0088] According to some embodiments, the transmit coil array 41 a is further configured to receive the first LO signal from the first receive auxiliary coil 31 b in response to the transmit coil array 41 a at least partially overlapping the first receive auxiliary coil 31 b .

[0089] According to some embodiments, the transmit coupler 41 further includes a transmit auxiliary coil 41b, wherein the transmit coil array 41a is disposed within the transmit auxiliary coil 41b, and the transmit auxiliary coil 41b is configured to: in response to the transmit auxiliary coil 41b at least partially overlapping with the first receive auxiliary coil 31b, receive at least one of the first power signal, the first tuning control signal, and the first LO signal from the first receive auxiliary coil 31b. It should be understood that, as described above, the transmit coil array 41a or the transmit auxiliary coil 41b in the transmit coupler 41 can be used to receive the first LO signal from the first receive auxiliary coil 31b.

[0090] According to some embodiments, the transmitting auxiliary coil 41b is further configured to: transmit a signal corresponding to the induced voltage to the subject-side transmission component 30, allowing the subject-side transmission component 30 to adjust the transmitted power signal so that the first local coil device 40 side reaches the required voltage value. According to some embodiments, the transmitting coil array 41a and the transmitting auxiliary coil 41b are arranged to be coplanar. According to some embodiments, the transmitting coil array 41a and the transmitting auxiliary coil 41b can also be arranged to be concentric.

[0091] Figure 4A-4B Schematic diagram of wireless transmission between the first receiving coupler 31 and the transmitting coupler 41 according to an embodiment of the present disclosure is shown. It should be understood that the first receiving coupler 31 in the subject-side transmission component 30 is usually below the examination bed 20, and the transmitting coupler 41 in the first local coil device 40 is usually above the examination bed 20, so at least the examination bed 20 is spaced between the two, but for the convenience of illustration, only the first receiving coupler 31 and the transmitting coupler 41 are drawn, and other components in the magnetic resonance imaging device 100 are omitted.

[0092] like Figure 4A As shown, when the transmitting coupler 41 moves to the first position, the corresponding first local coil device 40 (wherein other components except the transmitting coupler 41 are not shown) also moves into the FOV, so that the first magnetic resonance signal emitted by the subject 60 can be received, and the transmitting coil array 41a and the first receiving coil 31a at least partially overlap, so that the corresponding first IF signal can be wirelessly transmitted between the transmitting coil array 41a and the first receiving coil 31a. And, as shown in FIG. Figure 4AAs also shown in FIG. 1 , the transmitting auxiliary coil 41b located in the first local coil device 40 at least partially overlaps with the first receiving auxiliary coil 31b, so that the first power signal and / or the first tuning control signal transmission between the transmitting auxiliary coil 41b and the first receiving auxiliary coil 31b is performed, and the transmitting coil array 41a or the transmitting auxiliary coil 41b at least partially overlaps with the first receiving auxiliary coil 31b, so that the first LO signal transmission between the transmitting coil array 41a or the transmitting auxiliary coil 41b and the first receiving auxiliary coil 31b is performed. It should be noted that the transmitting coupler 41 only needs to be above the first receiving coupler 31, and does not need to be moved to be concentric with the first receiving coupler 31.

[0093] like Figure 4B As shown in FIG. 1 , when the transmitting coupler 41 moves to the second position, the corresponding first local coil device 40 (wherein other components except the transmitting coupler 41 are not shown) also moves out of the FOV, so that the subject 60 is no longer imaged, and the transmitting coil array 41a and the first receiving coil 31a no longer overlap, so that the transmitting coil array 41a no longer transmits the first IF signal to the first receiving coil 31a. Figure 4B As also shown in FIG. 4 , there is still an overlapping portion between the transmitting auxiliary coil 41 b and the first receiving auxiliary coil 31 b , and the transmitting auxiliary coil 41 b still receives the power signal from the first receiving auxiliary coil 31 b and the tuning control signal corresponding to the detuning, so that the first local coil device 40 is detuned.

[0094] Figure 5 A schematic diagram showing first IF signal transmission in a wireless transmission device according to an embodiment of the present disclosure is shown.

[0095] like Figure 5 As shown, the first local coil device 40 includes a first magnetic resonance coil 43 and a first frequency converter 42 , and the wireless transmission device includes a transmitting coupler 41 and a first receiving coupler 31 .

[0096] As described above, the first magnetic resonance coil 43 is configured to detect the first magnetic resonance signal emitted by the subject 60, and the first frequency converter 42 converts the first magnetic resonance signal into a first IF signal. According to some embodiments, a low noise amplifier may be provided between the first magnetic resonance coil 43 and the first frequency converter 42 to amplify the first magnetic resonance signal, and a matching circuit may be provided between the first magnetic resonance coil 43 and the low noise amplifier to adapt the impedance of the first magnetic resonance coil 43 to the low noise amplifier. According to some embodiments, the transmitting coupler 41 is coupled with the first receiving coupler 31 to wirelessly transmit the first IF signal converted by the first frequency converter 42 to the first receiving coupler 31. According to some embodiments, the first receiving coupler 31 transmits the received first IF signal to the control terminal 70 of the magnetic resonance imaging device, wherein the main body side transmission component 30 may also include other components (e.g., amplifier, ADC converter) to post-process the first IF signal, and transmit the post-processed signal to the control terminal 70.

[0097] According to some embodiments, the first local coil device 40 is a local coil device having a contact surface with the examination bed 20, and the first local coil device 40 is a head coil device, a neck coil device, a head and neck coil device, a spine coil device, a chest coil device, a knee coil device, or an ankle coil device.

[0098] In actual applications, there are some local coil devices (e.g., body coil devices or flexible coil devices) that do not have a contact surface with the examination bed, and the distance between them and the main body side transmission component 30 is relatively far. Therefore, if wireless transmission is adopted in the wireless transmission device described with reference to the first local coil device 40, the SNR may be too high due to the long coupling distance. Therefore, the local coil device that does not have a contact surface with the examination bed 20 can be connected to a local coupler (e.g., a local coupler disposed on the examination bed 20) by wire, and then wireless transmission with the main body side transmission component 30 is performed through the local coupler, thereby shortening the coupling distance of the wireless transmission.

[0099] According to some embodiments, the magnetic resonance imaging apparatus further comprises a second local coil device, the second local coil device comprising: a second magnetic resonance coil configured to detect a second magnetic resonance signal emitted by the subject; and a second frequency converter configured to: convert the second magnetic resonance signal into a second intermediate frequency signal; and in response to the second local coil device being electrically connected to the local coupler, transmit the second intermediate frequency signal to the local coupler.

[0100] According to some embodiments, the wireless transmission device further includes: a local coupler including a local coupling coil array, the local coupling coil array including one or more local coupling coils, and used to: be electrically connected to a second local coil device located above an examination site of the subject to receive a second IF signal from the second local coil device, wherein the second IF signal is generated based on a second magnetic resonance signal received by the second local coil device from the subject; and transmit the second IF signal; a second receiving coupler including a second receiving coil array, the second receiving coil array including one or more second receiving coils, and located below a trajectory of the examination bed sliding over the magnetic resonance subject, the second receiving coil array being configured to: receive the second IF signal from the local coupling coil array in response to the local coupling coil array at least partially overlapping the second receiving coil array.

[0101] Figure 6 FIG. 2 shows a structural diagram of the main body side transmission component 30 in the wireless transmission device according to an embodiment of the present disclosure. Figure 6 As shown, in addition to the first receiving coupler 31, the main body side transmission component 30 also includes a second receiving coupler 32, and the second receiving coupler 32 includes a second receiving coil array 32a, including one or more second receiving coils, and the second coil array 32a is configured to: in response to the local coupling coil array 21a in the local coupler 21 electrically connected to the second local coil device 50 at least partially overlapping with the second receiving coil array 32a, receive the second IF signal from the local coupling coil array 21a, wherein the second IF signal is generated based on the second magnetic resonance signal emitted by the subject 60 detected by the second local coil device, and the local coupling coil array includes one or more local coupling coils. According to some embodiments, Figure 6 The first receiving coupler 31 can be connected to the reference Figure 2 The second receiving coupler 31 is the same as or similar to the first receiving coupler 31 described above. According to some embodiments, when the second receiving coupler 32 is locked onto the examination bed 20 as described below, the second receiving coil array 32a at least partially overlaps with the local coupling coil array 21a, and the second receiving coil array 32a receives the second IF signal from the local coupling coil array 21a.

[0102] According to some embodiments, the second IF signal transmitted between the local coupling coil array 21a of the local coupler 21 and the second receiving coil array 32a of the second receiving coupler 32 may be one second IF signal at one IF frequency, or may be multiple second IF signals at multiple IF frequencies. For example, the second IF signal may include two IF signals at 8.6 MHz and 11.4 MHz, respectively. According to some embodiments, the number of local coupling coil arrays 21a in the local coupler 21 and the number of second receiving coil arrays 32a in the second receiving coupler 32 may be associated with the number of IF frequencies corresponding to the second IF signal, wherein the more the number of IF frequencies corresponding to the second IF signal, the fewer the number of local coupling coil arrays 21a in the local coupler 21 and the number of second receiving coil arrays 32a in the second receiving coupler 32.

[0103] According to some embodiments, since the local coupler 21 and the second receiving coupler 32 can be locked for wireless transmission, the number and / or arrangement of the local coupling coil arrays 21a in the local coupler 21 and the number and / or arrangement of the second receiving coil arrays 32a in the second receiving coupler 32 can be set to be the same.

[0104] According to some embodiments, the first receiving coupler 31 and the second receiving coupler 32 may be arranged at different positions relative to the magnetic resonance body 10. For example, the first receiving coupler 31 may be arranged in the inner wall of the magnetic resonance body 10 to reduce the components exposed to the outside, and the second receiving coupler 32 may be arranged on the inner wall of the magnetic resonance body 10 or connected to the magnetic resonance body 10 through a cable, etc., so that the second receiving coupler 32 can be locked to the local coupler when the examination bed 20 slides into the cavity 14 to reduce the coupling distance between the second receiving coupler 32 and the local coupler. According to other embodiments, the first receiving coupler 31 and the second receiving coupler 32 may both be arranged on the inner wall of the magnetic resonance body 10.

[0105] According to some embodiments, the local coupler may be disposed on the examination bed 20, for example, in a slot on the left side, right side, or near the head of the examination bed 20. According to other embodiments, the local coupler may be a component disposed separately from the examination bed 20, for example, the local coupler may be connected to the second local coil device 50 on the subject 60 via a cable passing through an opening on the examination bed 20, and the local coupler may be located below the examination bed 20 and may be locked to the second receiving coupler 32.

[0106] According to some embodiments, the second receiving coupler 32 can be set outside the FOV (for example, the left or right side) or in the FOV of the magnetic resonance body, and accordingly, the local coupler on the examination bed 20 is set in a slot on the left side, right side or near the head position of the examination bed 20. According to some embodiments, since the local coupler on the examination bed 20 cannot be set too large, the coupling distance between the second receiving coupler 32 and the local coupler should be set to be smaller. For example, due to the limited space on the examination bed, the diameter of the coil in the local coupler can be set to 15 mm, and the corresponding coupling distance should be less than 7.5 mm. According to some embodiments, one or more second receiving couplers 32 can be set in the main body side transmission component 30, for example, one second receiving coupler 32 is set on each side of the first receiving coupler 31.

[0107] In the following, reference Figure 7 and 8 The structural diagram of the second receiving coupler 32 and the local coupler 21 in the main body side transmission component 30 according to the embodiment of the present disclosure is described in detail.

[0108] According to some embodiments, Figure 7 As shown, the second receiving coil array 32a in the second receiving coupler 32 is arranged along the directions of both sides of the examination bed (for example, Figure 1 A row of second receiving coils extending in the direction y) shown in FIG. It should be understood that Figure 7 The second receiving coil array 32a in FIG. 3 is only illustrative, and the second receiving coil array 32a may have a different number of second receiving coils. According to some embodiments, adjacent second receiving coils in the second receiving coil array 32 may be configured to partially overlap each other.

[0109] According to some embodiments, similar to what is described with reference to the first receive coupler 31, the second receive coupler 32 receives the second LO signal from the local coupler 21 to achieve conversion from the second magnetic resonance signal to the second LO signal. According to some embodiments, similar to what is described with reference to the first receive coupler 31, the second receive coupler 32 receives one second LO signal at one frequency or a plurality of second LO signals at a plurality of frequencies from the local coupler 21.

[0110] According to some embodiments, the second receiving coupler 32 further includes a second receiving auxiliary coil 32b, wherein the second receiving coil array 32a is disposed within the second receiving auxiliary coil 32b, and the second receiving auxiliary coil 32b is configured to transmit at least one of a second power signal, a second tuning control signal, and a second LO signal. According to some embodiments, the second receiving coil array 32a is disposed within the second receiving auxiliary coil 32b, which means that the second receiving coil array 32a is within the range of the second receiving auxiliary coil 32b on the plane of movement of the examination bed (i.e., the plane formed by the x-axis and the y-axis). According to some embodiments, the second receiving coil array 32a and the second receiving auxiliary coil 32b are arranged to be coplanar, and / or the second receiving coil array 32a and the second receiving auxiliary coil 32b are arranged to be concentric.

[0111] According to some embodiments, the second reception auxiliary coil 32b is configured to perform at least one of the following: in response to the coupling auxiliary coil 21b in the local coupler 21 at least partially overlapping with the second reception auxiliary coil 32b, transmitting a second power signal and / or a second tuning control signal to the coupling auxiliary coil 21b in the local coupler 21; and in response to the component for transmitting the second LO signal in the local coupler 21 at least partially overlapping with the second reception auxiliary coil 32b, transmitting a second LO signal to the component for transmitting the second LO signal, wherein the component for transmitting the second LO signal in the local coupler is the local coupling coil array 21a or the coupling auxiliary coil 21b. According to some embodiments, as described with reference to the following, when the second receiving coupler 32 is locked onto the examination bed 20, the coupling auxiliary coil 21b at least partially overlaps with the second receiving auxiliary coil 32b, the coupling auxiliary coil 21b receives the second power signal and / or the second tuning control signal from the second receiving auxiliary coil 32b, and the local coupling coil array 21a or the coupling auxiliary coil 21b at least partially overlaps with the second receiving auxiliary coil 32b, and the local coupling coil array 21a or the coupling auxiliary coil 21b receives the second LO signal from the second receiving auxiliary coil 32b.

[0112] According to some embodiments, the second local coil device 50 in the magnetic resonance imaging apparatus 10 is configured to: detect a second magnetic resonance signal emitted by the subject 60; convert the second magnetic resonance signal into a second IF signal; and transmit the second IF signal to the second local coil device 50 in response to the second local coil device 50 being electrically connected to the local coupler 21.

[0113] According to some embodiments, the local coupler 21 in the magnetic resonance imaging apparatus 10 includes a local coupling coil array 21a, the local coupling coil array 21a includes one or more local coupling coils, and the local coupling coil array 21a is configured to transmit a second IF signal to the second receiving coil array 32a in response to the local coupling coil array 21a being electrically connected to the second local coil device 50 and the local coupling coil array 21a at least partially overlapping with the second receiving coil array 32a of the subject-side transmission component 30.

[0114] According to some embodiments, similar to what is described above with reference to the first local coil device 40, a second magnetic resonance coil and a second frequency converter may be provided in the second local coil device 50, wherein the second magnetic resonance coil is configured to detect a second magnetic resonance signal emitted by the object 60, and the second frequency converter is configured to convert the second magnetic resonance signal into a second IF signal. According to some embodiments, similar to what is described above with reference to the first local coil device 40, a low noise amplifier and / or a matching circuit may be provided between the second magnetic resonance coil and the second frequency converter.

[0115] Figure 8 2 shows a structural diagram of a local coupler 21 according to an embodiment of the present disclosure. According to some embodiments, Figure 8 The structure of the local coupler 21 in Figure 7 According to some embodiments, when wireless transmission is performed between the local coupler 21 and the second receiving coupler 32, the local coupler 21 and the second receiving coupler 32 may be locked to each other to reduce the coupling distance.

[0116] According to some embodiments, the local coupling coil array 21a is further configured to: in response to the local coupling coil array 21a at least partially overlapping with the second receiving coil array 32a, transmit the second IF signal to the second receiving coil array 32a. According to some embodiments, the local coupler 21 also includes a coupling auxiliary coil 21b, and the local coupling coil array 21a is arranged inside the coupling auxiliary coil 21b. According to some embodiments, the local coupling coil array 21a is arranged inside the coupling auxiliary coil 21b means that: on the plane of movement of the examination bed (i.e., the plane formed by the x-axis and the y-axis), the local coupling coil array 21a is within the range of the coupling auxiliary coil 21b. According to some embodiments, the local coupler 21 is configured to perform at least one of the following: in response to the coupling auxiliary coil 21b at least partially overlapping with the second reception auxiliary coil 32b, the coupling auxiliary coil 21b receives at least one of the second power signal and the second tuning control signal from the second reception auxiliary coil 32b; and in response to the component for transmitting the second LO signal in the local coupler 21 at least partially overlapping with the second reception auxiliary coil 32b, the component for transmitting the second LO signal in the local coupler 21 receives the second LO signal from the second reception auxiliary coil 32b, wherein the component for transmitting the second LO signal in the local coupler 21 is the local coupling coil array 21a or the coupling auxiliary coil 21b.

[0117] According to some embodiments, as described with reference to the transmitting auxiliary coil 41 b, the coupling auxiliary coil 21 b is further configured to: transmit a signal corresponding to the induced voltage to the main body side transmission component 30, allowing the main body side transmission component 30 to adjust the transmitted power signal so that the second local coil device 40 side reaches the required voltage value.

[0118] According to some embodiments, the wireless transmission device further includes a locking structure, which is configured such that: when the examination bed 20 slides to a locking position, the locking structure locks the second receiving coupler 32 to the local coupler 21; and when the examination bed slides to an unlocking position, the locking structure unlocks the second receiving coupler 32 from the local coupler 21. According to some embodiments, the locking position is a position when the examination bed 20 slides into the magnetic resonance chamber 14 and is about to image the subject 60 through the second local coil device 50. According to some embodiments, the unlocking position is a position when the examination bed 20 finishes imaging the subject 60 through the second local coil device 50 and slides out of the magnetic resonance chamber 14. According to some embodiments, the locking mechanism locks the second receiving coupler 32 to overlap with the local coupler 21 to perform wireless transmission therebetween.

[0119] Fig. 9 A schematic diagram showing the transmission of a second IF signal in a wireless transmission device according to an embodiment of the present disclosure is shown.

[0120] As described above, the second local coil device 50 is electrically connected to the local coupler 21, and the local coupler 21 performs wireless transmission with the second receiving coupler 32, wherein Fig. 9 As shown, the second local coil device 50 includes a second magnetic resonance coil 52 and a second frequency converter 51 , and the subject-side transmission component 30 includes a second receiving coupler 32 .

[0121] According to some embodiments, the second magnetic resonance coil 52 is configured to detect a second magnetic resonance signal emitted by the subject 60, and the second frequency converter 51 converts the second magnetic resonance signal into a second IF signal. According to some embodiments, a low noise amplifier may be provided between the second magnetic resonance coil 52 and the second frequency converter 51 to amplify the second magnetic resonance signal, and a matching circuit may be provided between the second magnetic resonance coil 52 and the low noise amplifier to adapt the impedance of the second magnetic resonance coil 52 to the low noise amplifier. According to some embodiments, the second local coil device 50 (e.g., the second frequency converter 51 therein) is electrically connected to the local coupler 21 to transmit the second IF signal converted by the second frequency converter 51 to the local coupler 21. According to some embodiments, the local coupler 21 is coupled to the second receiving coupler 32 in the main body side transmission part 30 to wirelessly transmit the second IF signal to the second receiving coupler 32. According to some embodiments, the second receiving coupler 32 transmits the received second IF signal to the control end 70 of the magnetic resonance imaging device, wherein the main body side transmission component 30 may also include other components (e.g., an amplifier, an ADC converter) to post-process the second IF signal and transmit the post-processed signal to the control end 70.

[0122] According to some embodiments, the second local coil device 50 is a local coil device having no contact surface with the examination couch 20 , and the second local coil device 50 is a body coil device or a flexible coil device.

[0123] Figures 10A-10C The schematic diagram of the application scenario of operating the magnetic resonance imaging device 100 according to the embodiment of the present disclosure is shown. There are two first local coil devices placed on the examination bed 20, namely, the head coil device 80 and the spine coil device 90, and the magnetic resonance imaging device 100 may also include a local coupler 21 arranged in the examination bed 20. Fig. 10B and 10C In the figure, for the sake of clarity, only the outline of the first receiving coil array 31a is schematically drawn as a rectangle, and the details of the coils therein are not drawn. However, it should be understood that Fig. 10B and Fig. 10C The structure of the first receiving coil array 31a in Fig. 10AThe first receiving coil array 31a is the same as in FIG.

[0124] like Fig. 10A As shown, the examination bed 20 begins to move into the cavity 14 in the magnetic resonance body 10, wherein the local coil devices (e.g., the head coil device 80, the spine coil device 90, and the second local coil device connectable to the local coupler 21) are not moved into the FOV, and the head coil device 80 and the spine coil device 90 are not overlapped with the first receiving coupler 31 in the body-side transmission component 30, and the second receiving coupler 32 is not locked to the examination bed 20. Accordingly, the head coil device 80, the spine coil device 90, and the second local coil device connectable to the local coupler 21 are not imaged for the subject (not shown in the figure for the sake of simplicity), and wireless transmission with the body-side transmission component 30 is not performed.

[0125] like Fig. 10B As shown, the examination bed 20 moves into the cavity 14 in the magnetic resonance body 10, wherein the head coil device 80 moves into the FOV, while the spine coil device 90 has not yet moved into the FOV. Accordingly, the head of the subject can be imaged through the head coil device 80, while the spine of the subject has not yet been imaged through the spine coil device 90. The head coil device 80 detects the magnetic resonance signal emitted by the head of the subject. In addition, since the head transmitting coil array 81a of the head coil device 80 overlaps with the first receiving coil array 31a, and the head transmitting coil array 81a and the head transmitting auxiliary coil 81b of the head coil device 80 overlap with the first receiving auxiliary coil 31b, the head coil device 80 converts the magnetic resonance signal emitted by the head of the subject into an IF signal and transmits it to the main body side transmission component 30. In addition, the second receiving coupler 32 has been locked to the examination bed 20, and the second local coil device that has no contact surface with the examination bed 20 can also be electrically connected to the local coupler 21 on the examination bed 20, so that imaging is performed through the second local coil device, and the second IF signal is transmitted to the second receiving coupler 32.

[0126] like Fig. 10CAs shown, the examination bed 20 moves further, wherein the head coil device 80 moves out of the FOV, while the spine coil device 90 moves into the FOV. Accordingly, the imaging of the head of the subject through the head coil device 80 can be terminated, and the imaging of the spine of the subject can be performed through the spine coil device 90. The spine coil device 80 detects the magnetic resonance signal emitted by the spine of the subject. In addition, since the spine transmitting coil array 91a of the spine coil device 90 overlaps with the first receiving coil array 31a, and the spine transmitting coil array 91a and the spine transmitting auxiliary coil 91b of the spine coil device 90 overlap with the first receiving auxiliary coil 91b, the spine coil device 90 converts the magnetic resonance signal emitted by the spine of the subject into an IF signal and transmits it to the main body side transmission component 30. In addition, the second receiving coupler 32 is unlocked from the examination bed 20, and wireless transmission is no longer performed between the local coupler 21 and the second receiving coupler 32.

[0127] pass Figures 10A-10C It can be seen that, by moving the examination bed 20, the local coil devices (for example, the head coil device 80, the spine coil device 90) having a contact surface with the examination bed 20 can be moved into the FOV in sequence to image the corresponding parts, and overlap with the first receiving coupler 31 to perform wireless transmission of signals; and, by electrically connecting the local coil device that does not have a contact surface with the examination bed 20 to the local coupler 21, the examination bed 20 can be moved to a locking position so that the local coupler 21 is locked with the second receiving coupler 32 to perform wireless transmission of signals.

[0128] It should be understood that the above application scenarios are only illustrative, and the actual application scenarios may be different from this. For example, the unlocking position of the examination bed 20 may be set to be different from the unlocking position of the examination bed 20. Fig. 10C Different from the above, the examination bed 20 can slide to Fig. 10C The unlocking is done only when the position in the magnetic resonance chamber is farther away from the magnetic resonance chamber 10.

[0129] Although the embodiments or examples of the present disclosure have been described with reference to the accompanying drawings, it should be understood that the above-mentioned methods, systems and devices are merely exemplary embodiments or examples, and the scope of the present invention is not limited by these embodiments or examples, but only by the claims after authorization and their equivalent scope. Various elements in the embodiments or examples can be omitted or replaced by their equivalent elements. In addition, each step can be performed in an order different from that described in the present disclosure. Further, the various elements in the embodiments or examples can be combined in various ways. It is important that with the evolution of technology, many elements described herein can be replaced by equivalent elements that appear after the present disclosure.

Claims

1. A wireless transmission device for a magnetic resonance imaging device, the wireless transmission device comprising: a transmitting coupler, comprising a transmitting coil array, wherein the transmitting coil array comprises one or more first transmitting coils, and is disposed in a first local coil device located on an examination bed and below an examination site of an object, and is used to transmit a first intermediate frequency signal, wherein the first intermediate frequency signal is generated based on a first magnetic resonance signal received by the first local coil device from the object; and The first receiving coupler includes a first receiving coil array, wherein the first receiving coil array includes one or more first receiving coils and is located below a track on which the examination bed slides past the magnetic resonance subject, and the first receiving coil array is configured as follows: In response to the transmitting coil array at least partially overlapping the first receiving coil array, the first intermediate frequency signal is received from the transmitting coil array.

2. The wireless transmission device according to claim 1, wherein: The first receive coil array overlaps a field of view of the magnetic resonance body.

3. The wireless transmission device according to claim 1 or 2, wherein: The first receiving coupler further includes a first receiving auxiliary coil, wherein the first receiving coil array is disposed within the first receiving auxiliary coil and the first receiving auxiliary coil is configured to transmit at least one of a first power signal, a first tuning control signal, and a first local oscillation signal, and The transmitting coupler further includes a transmitting auxiliary coil, wherein the transmitting coil array is disposed within the transmitting auxiliary coil, and the transmitting coupler is configured to perform at least one of the following: In response to the transmitting auxiliary coil at least partially overlapping the first receiving auxiliary coil, the transmitting auxiliary coil receives at least one of a first power signal and a first tuning control signal from the first receiving auxiliary coil; and In response to the component for transmitting the first local oscillator signal in the transmitting coupler at least partially overlapping with the first receiving auxiliary coil, the component for transmitting the first local oscillator signal in the transmitting coupler receives the first local oscillator signal from the first receiving auxiliary coil, wherein the component for transmitting the first local oscillator signal in the transmitting coupler is the transmitting coil array or the transmitting auxiliary coil.

4. The wireless transmission device according to claim 1, further comprising: A local coupler, comprising a local coupling coil array, the local coupling coil array comprising one or more local coupling coils, and configured to: electrically connected to a second local coil device located above an examination site of the subject to receive a second intermediate frequency signal from the second local coil device, wherein the second intermediate frequency signal is generated based on a second magnetic resonance signal received from the subject by the second local coil device; and transmitting the second intermediate frequency signal; and The second receiving coupler includes a second receiving coil array, wherein the second receiving coil array includes one or more second receiving coils and is located below a track where the examination bed slides over the magnetic resonance subject, wherein the second receiving coil array is configured as follows: In response to the locally coupled coil array at least partially overlapping the second receive coil array, a second intermediate frequency signal is received from the locally coupled coil array.

5. The wireless transmission device according to claim 4, further comprising a locking structure, wherein the locking structure is configured as follows: When the examination bed slides to a locked position, the locking structure locks the second receiving coupler to the local coupler; and When the examination bed slides to the unlocking position, the locking structure unlocks the second receiving coupler from the local coupler.

6. The wireless transmission device according to claim 4 or 5, wherein: The second receiving coupler further includes a second receiving auxiliary coil, wherein the second receiving coil array is disposed within the second receiving auxiliary coil and the second receiving auxiliary coil is configured to transmit at least one of a second power signal, a second tuning control signal, and a second local oscillation signal, and The local coupler further comprises a coupling auxiliary coil, wherein the local coupling coil array is disposed in the coupling auxiliary coil, and the local coupler is configured to perform at least one of the following: In response to the coupling auxiliary coil at least partially overlapping the second reception auxiliary coil, the coupling auxiliary coil receiving at least one of a second power signal and a second tuning control signal from the second reception auxiliary coil; and In response to the component for transmitting the second local oscillator signal in the local coupler at least partially overlapping with the second receiving auxiliary coil, the component for transmitting the second local oscillator signal in the local coupler receives the second local oscillator signal from the second receiving auxiliary coil, wherein the component for transmitting the second local oscillator signal in the local coupler is the local coupling coil array or the coupling auxiliary coil.

7. A magnetic resonance imaging device comprising: Magnetic resonance subject; Check the bed; The wireless transmission device according to any one of claims 1 to 6; as well as The first local coil device comprises: a first magnetic resonance coil configured to detect a first magnetic resonance signal emitted by the subject; as well as The first frequency converter is configured to convert the first magnetic resonance signal into the first intermediate frequency signal.

8. The magnetic resonance imaging apparatus according to claim 7, further comprising a second local coil device, wherein the second local coil device comprises: a second magnetic resonance coil configured to detect a second magnetic resonance signal emitted by the subject; as well as The second frequency converter is configured as follows: converting the second magnetic resonance signal into a second intermediate frequency signal; and In response to the second local coil device being electrically connected to the local coupler, the second intermediate frequency signal is transmitted to the local coupler.

9. The magnetic resonance imaging apparatus according to claim 7, wherein: The first local coil device is a head coil device, a neck coil device, a head-neck coil device, a spine coil device, a chest coil device, a knee coil device or an ankle coil device.

10. The magnetic resonance imaging apparatus according to claim 7, wherein: The second local coil device is a body coil device or a flexible coil device.

Images