Wireless coil power supply control device, wireless coil device and magnetic resonance imaging equipment

Abstract

The utility model relates to the technical field of wireless coils, in particular to a wireless coil power supply control device, a wireless coil device and magnetic resonance imaging equipment, and the wireless coil power supply control device comprises a power supply module which supplies power to a wireless coil; the coil identification unit is used for identifying the position of a wireless coil, and when the coil identification unit identifies that the wireless coil moves to a preset position, an enable signal is sent out; and the switch unit is connected between the power supply module and the wireless coil and is used for controlling the on-off of a power supply circuit between the power supply module and the wireless coil, and the switch unit is closed according to the enable signal from the coil identification unit so as to connect the power supply circuit. According to the utility model, useless loss of related equipment of the coil caused by continuous power supply of the wireless coil in non-scanning time can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless coils, and in particular to a wireless coil power supply control device, a wireless coil device and a magnetic resonance imaging device. Background Art

[0002] In magnetic resonance imaging, a local coil usually needs to be connected to the system via a cable or connector to complete power supply and data transmission.

[0003] With the development of wireless technology, a local coil that does not need to be physically connected to the magnetic resonance system, namely a wireless coil, has been introduced. Compared with the traditional method, the wireless coil is simpler and can be placed flexibly. However, since the wireless coil has no physical connection with the system, the coil cannot draw power from the system and needs its own independent power supply unit.

[0004] The commonly used method in the prior art is to realize the power supply of the wireless coil through energy storage units or wireless transmission. However, under normal circumstances, the coil only needs to work when performing magnetic resonance scanning. The coil does not need to work when not scanning or changing patients. If the wireless coil is still powered during the non-scanning time, the use time of the energy storage device will be greatly reduced, and additional heat loss will also be caused to the wireless coil. The existing technical solution cannot accurately avoid the power supply of the wireless coil during the non-scanning time, which leads to the loss of related equipment. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a wireless coil power control device, a wireless coil device and a magnetic resonance imaging device, which can solve the problem of large amount of useless loss of coil-related equipment caused by continuous power supply of the wireless coil during non-scanning time.

[0006] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a wireless coil power supply control device, which is applied to magnetic resonance imaging equipment, comprising:

[0007] Power module;

[0008] A coil identification unit, used to identify the position of the wireless coil;

[0009] A switch unit, used to control the on / off of the power supply circuit between the power module and the wireless coil;

[0010] When the coil identification unit identifies that the wireless coil moves to a preset position, an enable signal is output to the switch unit, the switch unit is closed to connect the power supply circuit, and the power supply module supplies power to the wireless coil.

[0011] In one embodiment of the utility model, the power module includes an energy storage unit and a power output unit;

[0012] When the power supply circuit is connected, the power output unit transmits the electric energy in the energy storage unit to the wireless coil.

[0013] In an embodiment of the present invention, the switch unit is disposed between the energy storage unit and the power output unit, or between the power output unit and the wireless coil.

[0014] In an embodiment of the present invention, the energy storage unit is also connected to the coil identification unit to supply power to the coil identification unit.

[0015] In one embodiment of the utility model, the switch unit includes a first resistor, a second resistor, a third resistor, a MOS transistor and a bipolar junction transistor;

[0016] The first end of the MOS transistor is connected to the coil identification unit and one end of the first resistor respectively, the second end is connected to one end of the second resistor, and the third end is grounded;

[0017] The first end of the bipolar junction transistor is connected to the power module and one end of the third resistor respectively, the second end is connected to the other end of the second resistor, and the third end is connected to the wireless coil;

[0018] The other end of the first resistor is grounded, and the other end of the second resistor is also connected to the other end of the third resistor.

[0019] In one embodiment of the utility model, the coil identification unit includes a Hall sensor, which is used to detect the spatial magnetic field around the wireless coil, and when the spatial magnetic field is greater than a preset magnetic field threshold, it is determined that the wireless coil has moved to the preset position.

[0020] In one embodiment of the utility model, the coil identification unit includes a position sensor, which is used to detect the relative distance between the wireless coil and the preset body coil. When the relative distance is less than a preset distance threshold, it is determined that the wireless coil has moved to the preset position.

[0021] In an embodiment of the utility model, the wireless coil includes a local coil and a wireless data transmission module, and the switch unit is used to control the on-off of the power supply circuit between the power module and the local coil and the wireless data transmission module.

[0022] The utility model also provides a wireless coil device, which is applied to a magnetic resonance imaging device, comprising:

[0023] wireless coil; and

[0024] A wireless coil power control device as described above.

[0025] The utility model also provides a magnetic resonance imaging device, comprising:

[0026] a magnet; and,

[0027] Check the bed;

[0028] The examination bed includes the wireless coil device as described above.

[0029] The utility model automatically identifies the access status of the wireless coil by adding a low-power coil identification unit, ensuring that the power supply time of the wireless coil is in the working state; through the controlled switch unit, the circuit channel is automatically controlled according to the identification result of the coil identification unit; the power supply can be automatically turned on and off in combination with the coil identification unit, realizing autonomous control of the circuit channel, avoiding the useless power consumption of the coil-related equipment during the non-scanning time to the greatest extent, and increasing the working time of the wireless coil. Therefore, the wireless coil power supply control device, wireless coil device and magnetic resonance imaging device proposed by the utility model can solve the problem of more useless losses of the coil-related equipment caused by the continuous power supply of the wireless coil during the non-scanning time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a functional module diagram of a wireless coil power supply control device in the prior art;

[0031] Figure 2 This is a functional module diagram of the wireless coil power supply control device provided by the utility model;

[0032] Figure 3 A functional module diagram of a wireless coil power supply control device in a switch unit setting mode provided by the utility model;

[0033] Figure 4 A functional module diagram of a wireless coil power control device in another switch unit setting mode provided by the utility model;

[0034] Figure 5 A circuit diagram of the switch unit provided by the utility model;

[0035] Figure 6 This is a functional module diagram of the wireless coil device provided by the utility model;

[0036] In the figure: 1, wireless coil device; 2, wireless coil power control device; 3, power module; 4, switch unit; 5, wireless coil; 6, coil identification module; 7, energy storage unit; 8, power output unit; 9, first resistor; 10, second resistor; 11, third resistor; 12, MOS transistor; 13, bipolar junction transistor. DETAILED DESCRIPTION

[0037] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0038] It should be noted that the illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0039] First, the technical background of this embodiment is briefly introduced. Figure 1 As shown, in the field of magnetic resonance, in order to reduce the loss of the local coil, a commonly used method is to design a power switch (i.e., switch unit 4) on the wireless coil device 1. When the wireless coil device 1 is needed to work, the switch is manually turned on to enable the power module 3 to supply power to the wireless coil 5; when the wireless coil device 1 is not in use, the power switch is turned off to cut off the power supply circuit.

[0040] However, the disadvantages of the prior art are: the power switch is a mechanical switch, and the added mechanical switch requires the wireless coil device 1 to be waterproof and dustproof, which increases the possibility of damage to the wireless coil device 1; in actual operation, the short-term switching of different patients requires medical personnel to manually open and close the switch, which is less practical and convenient, and cannot accurately control the power supply of the wireless coil device 1 during the non-scanning time.

[0041] In order to solve the problem in the prior art that the wireless coil device 1 may continue to be powered during non-scanning time, greatly reducing the use time of the energy storage device, and also causing additional heat loss to the wireless coil device 1, the utility model proposes a control device for the wireless coil device 1, which can automatically turn on and off the power supply in combination with the coil identification unit and the switch unit 4, realize autonomous control of the circuit channel, and maximize the avoidance of useless power consumption of coil-related equipment during non-scanning time, thereby increasing the working time of the wireless coil device 1.

[0042] Example 1

[0043] See also Figure 2 As shown, this embodiment provides a wireless coil power control device 2, including a power module 3, a coil identification module 6, and a switch unit 4.

[0044] Specifically, the switch unit 4 controls the on / off of the power supply circuit between the power module 3 and the wireless coil device 1 by closing and opening the switch. When the switch unit 4 is closed, the power supply circuit between the power module 3 and the wireless coil device 1 is connected, and the power module 3 supplies power to the wireless coil device 1; when the switch unit 4 is opened, the power supply circuit between the power module 3 and the wireless coil device 1 is disconnected, and the wireless coil device 1 has no power supply device for power supply.

[0045] In this embodiment, the power module 3 includes an energy storage unit 7 and a power output unit 8. When the power supply circuit between the energy storage unit 7, the power output unit 8 and the wireless coil device 1 is connected, the power output unit 8 transfers the electric energy in the energy storage unit to the wireless coil device 1; otherwise, the wireless coil device 1 has no power supply device for power supply.

[0046] In detail, in some cases, the voltage in the energy storage unit 7 cannot directly power the wireless coil device 1, and power conversion is required; for example, the voltage in the energy storage unit 7 is 5V, and the power supply voltage required by the wireless coil device 1 may be 3.3V. Therefore, it is necessary to use the power output unit 8 to convert the 5V voltage in the energy storage unit 7 into the power supply voltage of 3.3V required by the wireless coil device 1; and, the voltage in the energy storage unit 7 may be variable and unstable, and the power supply voltage required by the wireless coil device 1 needs to be stable, and the voltage output by the energy storage unit 7 can be controlled by the power output unit 8.

[0047] See also Figure 3As shown, in the embodiment of the utility model, the switch unit 4 can be arranged between the energy storage unit and the power output unit 8, the power output unit is connected to the wireless coil device 1, and the switch unit 4 is used to control the on-off of the circuit between the energy storage unit and the power output unit 8, thereby realizing the on-off control of the power supply circuit between the power module 3 and the wireless coil device 1; when the switch unit 4 is not closed, the power output unit 8 and the wireless coil device 1 are not powered, which can avoid the power output unit 8 and the wireless coil device 1 The energy consumption is minimized when the wireless coil device 1 is not working.

[0048] In addition, see Figure 4 As shown, the switch unit 4 can also be arranged between the power output unit 8 and the wireless coil device 1, the energy storage unit is connected to the power output unit 8, and the switch unit 4 is used to control the on-off of the circuit between the power output unit 8 and the wireless coil device 1, thereby realizing the on-off control of the power supply circuit between the power module 3 and the wireless coil device 1; when the switch unit 4 is not closed, the wireless coil device 1 is not powered, and the power consumption of the wireless coil device 1 can be avoided when the wireless coil device 1 is not working.

[0049] In this embodiment, the switch unit 4 may be an integrated chip with enable control, such as an analog switch; the enable signal sent by the coil identification module 6 may control the integrated chip to open and close the switch.

[0050] In another optional embodiment, the switch unit 4 can also be a switch circuit with enable control, and the switch circuit can be constructed by discrete devices such as BJT or MOS tube, and is turned on when there is an enable signal and turned off when there is no enable signal.

[0051] Specifically, see Figure 5 As shown, the switch circuit includes a first circuit and a second circuit, the first circuit includes a first resistor 9 and a MOS transistor 12, and the second circuit includes a second resistor 10, a third resistor 11 and a bipolar junction transistor 13;

[0052] The first end (gate) of the MOS transistor 12 is connected to the coil identification unit and one end of the first resistor 9 respectively, the second end (drain) is connected to one end of the second resistor 10, and the third end (source) is connected to the ground; the first end (emitter) of the bipolar junction transistor 13 is connected to the power module 3 and one end of the third resistor 11 respectively, the second end (base) is connected to the other end of the second resistor 10, and the third end (collector) is connected to the wireless coil device 1; the other end of the first resistor 9 is connected to the ground, and the other end of the second resistor 10 is also connected to the other end of the third resistor 11.

[0053] The MOS transistor 12 is an NMOS transistor. According to the characteristics of NMOS, the transistor can be turned on when Vgs (gate voltage) is greater than a certain value, and low-end driving is achieved by grounding the source. For example, the MOS transistor 12 can be turned on when the gate voltage (ie, the enable signal) reaches 4V or 10V.

[0054] The bipolar junction transistor 13 is a PNP type triode, and the current direction is from the emitter to the base (the driving current flows out from the base), and the emitter to the collector; when the voltage of the emitter of the bipolar junction transistor 13 is equal to the base voltage, the bipolar junction transistor 13 is not turned on; when the voltage of the emitter of the bipolar junction transistor 13 is less than the voltage of the base, the bipolar junction transistor 13 is turned on;

[0055] Therefore, after the MOS transistor 12 is turned on, that is, after the first circuit is turned on, the current passes through the second resistor 10, and the third resistor 11 divides the current flowing out of the second resistor 10, so that the voltage of the emitter of the bipolar junction transistor 13 is less than the voltage of the base. At this time, the bipolar junction transistor 13 is turned on, and the switching circuit is turned on, that is, the power supply circuit between the power module 3 and the wireless coil device 1 is connected.

[0056] In another optional embodiment, the transistor in the first circuit is not limited to the MOS transistor 12 , and the transistor in the second circuit is not limited to the bipolar junction transistor 13 .

[0057] In this embodiment, the coil identification unit is used to identify the position of the wireless coil device 1. When the coil identification unit identifies that the wireless coil device 1 has moved to a preset position, it outputs an enable signal to the switch unit 4. The switch unit 4 is closed according to the enable signal to connect the power supply circuit between the power module 3 and the wireless coil device 1, and the power module 3 supplies power to the wireless coil device 1.

[0058] Furthermore, the energy storage unit in the power module 3 is also connected to the coil identification unit to supply power to the coil identification unit; it should be noted that the power consumption of the coil identification unit is relatively low and does not consume too much power in standby mode (non-scanning time).

[0059] In an optional embodiment, the coil identification unit includes a Hall sensor, and the Hall sensor is used to detect the spatial magnetic field around the wireless coil device 1.

[0060] Specifically, the Hall sensor can be made of semiconductor material and pass continuous current through itself; when the magnetic flux density around the sensor exceeds a preset threshold, the Hall sensor will detect the magnetic field and generate a Hall voltage; in the magnetic field, the size of the spatial magnetic field around the wireless coil device 1 can be determined by the size of the Hall voltage output by the Hall sensor, and then the distance between the magnetic field and the Hall sensor, that is, the relative position around the wireless coil device 1, can be determined.

[0061] When the spatial magnetic field is greater than a preset magnetic field threshold, it is determined that the wireless coil device 1 has moved to the preset position; the magnetic field threshold may be the magnetic field strength when the wireless coil device 1 (examination bed) enters the magnet in the magnetic resonance imaging device. In the process of the wireless coil device 1 entering the magnet of the magnetic resonance imaging device along with the examination bed, the spatial magnetic field gradually increases. When the magnetic field threshold is reached, it is determined that the wireless coil device 1 needs to be used for magnetic resonance scanning, the coil identification unit outputs an enable signal, the power supply circuit is turned on, and the power module 3 supplies power to the wireless coil device 1; in the process of the wireless coil device 1 exiting the magnet of the magnetic resonance imaging device along with the examination bed, the spatial magnetic field gradually decreases. When the magnetic field threshold is reached, it is determined that the wireless coil device 1 does not need to be used for magnetic resonance scanning.

[0062] During the examination process, if the spatial magnetic field detected by the Hall sensor is greater than the magnetic field strength, it means that the examination bed enters or leaves the magnet of the magnetic resonance imaging equipment or performs a scanning examination in a normal magnetic environment, and the position range from when the examination bed enters the magnet to when the examination bed stops moving for scanning examination is the preset position.

[0063] In another optional embodiment, the coil identification unit includes a position sensor, and the position sensor is used to detect the relative distance between the wireless coil device 1 and a preset body coil, wherein the body coil is a coil of a magnet in a magnetic resonance imaging device.

[0064] Specifically, when the relative distance detected by the position sensor is less than a preset distance threshold, it is determined that the wireless coil device 1 has moved to the preset position; the preset distance threshold may be the distance between the wireless coil device 1 and the body coil when the wireless coil device 1 (examination bed) enters the body coil in the magnetic resonance imaging device; in the process of the wireless coil device 1 entering the body coil of the magnetic resonance imaging device along with the examination bed, the relative distance gradually decreases, and when it is less than the distance threshold, it is determined that the wireless coil device 1 needs to be used for magnetic resonance scanning, the coil identification unit outputs an enable signal, the power supply circuit is turned on, and the power module 3 supplies power to the wireless coil device 1; in the process of the wireless coil device 1 exiting the body coil of the magnetic resonance imaging device along with the examination bed, the relative distance gradually increases, and when it is greater than the distance threshold, it is determined that the wireless coil device 1 does not need to be used for magnetic resonance scanning.

[0065] During the examination process, if the relative distance detected by the position sensor is less than the distance threshold, it means that the examination bed enters or leaves the magnet of the magnetic resonance imaging device or performs a scanning examination in a normal magnet environment, and the position range from when the examination bed enters the magnet to when the examination bed stops moving for scanning examination is the preset position.

[0066] Example 2

[0067] See also Figure 6 As shown, this embodiment proposes a wireless coil device 1, including the wireless coil power control device 2 and the wireless coil 5 described above, wherein the wireless coil power control device 2 includes a power module 3, a coil identification module 6, and a switch unit 4.

[0068] Specifically, the switch unit 4 controls the on / off of the power supply circuit between the power module 3 and the wireless coil 5 by closing and opening the switch. When the switch unit 4 is closed, the power supply circuit between the power module 3 and the wireless coil 5 is connected, and the power module 3 supplies power to the wireless coil 5; when the switch unit 4 is opened, the power supply circuit between the power module 3 and the wireless coil 5 is disconnected, and the wireless coil 5 has no power supply device to supply power.

[0069] The coil identification unit is used to identify the position of the wireless coil device 1 (wireless coil 5). When the coil identification unit identifies that the wireless coil device 1 has moved to a preset position, it outputs an enable signal to the switch unit 4. The switch unit 4 is closed according to the enable signal to connect the power supply circuit between the power module 3 and the wireless coil 5, and the power module 3 supplies power to the wireless coil 5.

[0070] In this embodiment, the wireless coil 5 includes a local coil, a wireless data transmission module, a clock module, etc. The power module 3 supplies power to the wireless coil 5, which means supplying power to local functional modules such as the local coil, the wireless data transmission module, the clock module, etc. in the module to realize specific functions.

[0071] After the power module 3 supplies power to the local coil, current will flow through the local coil, which can generate a corresponding potential signal to transmit a radio frequency signal, etc.; after supplying power to the wireless data transmission module, data transmission and exchange of the wireless coil device 1 can be realized.

[0072] The wireless coil power control device 2 and the wireless coil device 1 perform the following steps during operation:

[0073] Step 1: Use the coil identification unit to identify the position of the wireless coil device 1.

[0074] In this embodiment, the coil identification unit is used to identify the position of the wireless coil device 1 and may be a Hall sensor or a position sensor.

[0075] Specifically, the Hall sensor is used to detect the spatial magnetic field around the wireless coil device 1. When the magnetic flux density around the sensor exceeds a preset threshold, the Hall sensor will detect the magnetic field and generate a Hall voltage. In the magnetic field, the size of the spatial magnetic field around the wireless coil device 1 can be determined by the size of the Hall voltage output by the Hall sensor, and then the distance between the magnetic field and the Hall sensor, that is, the relative position around the wireless coil device 1, can be determined. The position sensor is used to detect the relative distance between the wireless coil device 1 and a preset body coil, wherein the body coil is the coil of the magnet in the magnetic resonance imaging device.

[0076] Step 2: When the coil recognition unit recognizes that the wireless coil device 1 moves to a preset position, an enable signal is output to the switch unit 4 .

[0077] In this optional embodiment, when the coil identification unit is a Hall sensor, the step of identifying the position of the wireless coil device 1 by using the coil identification unit includes:

[0078] Using a Hall sensor to detect the spatial magnetic field around the wireless coil device 1;

[0079] When the spatial magnetic field is greater than a preset magnetic field threshold, it is determined that the wireless coil device 1 moves to the preset position.

[0080] Among them, when the spatial magnetic field is greater than a preset magnetic field threshold, it is determined that the wireless coil device 1 has moved to the preset position; the magnetic field threshold may be the magnetic field strength when the wireless coil device 1 (examination bed) enters the magnet in the magnetic resonance imaging device. In the process of the wireless coil device 1 entering the magnet of the magnetic resonance imaging device along with the examination bed, the spatial magnetic field gradually increases. When the magnetic field threshold is reached, it is determined that the wireless coil device 1 needs to be used for magnetic resonance scanning, the coil identification unit outputs an enable signal, the power supply circuit is turned on, and the power module 3 supplies power to the wireless coil device 1; in the process of the wireless coil device 1 exiting the magnet of the magnetic resonance imaging device along with the examination bed, the spatial magnetic field gradually decreases. When the magnetic field threshold is reached, it is determined that the wireless coil device 1 does not need to be used for magnetic resonance scanning.

[0081] During the examination process, if the spatial magnetic field detected by the Hall sensor is greater than the magnetic field strength, it means that the examination bed enters or leaves the magnet of the magnetic resonance imaging equipment or performs a scanning examination in a normal magnetic environment, and the position range from when the examination bed enters the magnet to when the examination bed stops moving for scanning examination is the preset position.

[0082] In another optional embodiment, when the coil identification unit is a position sensor, the step of using the coil identification unit to identify the position of the wireless coil device 1 includes:

[0083] Using a position sensor to detect the relative distance between the wireless coil device 1 and a preset body coil;

[0084] When the relative distance is less than a preset distance threshold, it is determined that the wireless coil device 1 moves to the preset position.

[0085] Among them, when the relative distance detected by the position sensor is less than a preset distance threshold, it is determined that the wireless coil device 1 has moved to the preset position; the preset distance threshold may be the distance between the wireless coil device 1 and the body coil when the wireless coil device 1 (examination bed) enters the body coil in the magnetic resonance imaging device; in the process of the wireless coil device 1 entering the body coil of the magnetic resonance imaging device along with the examination bed, the relative distance gradually decreases, and when it is less than the distance threshold, it is determined that the wireless coil device 1 needs to be used for magnetic resonance scanning, the coil identification unit outputs an enable signal, the power supply circuit is turned on, and the power module 3 supplies power to the wireless coil device 1; in the process of the wireless coil device 1 exiting the body coil of the magnetic resonance imaging device along with the examination bed, the relative distance gradually increases, and when it is greater than the distance threshold, it is determined that the wireless coil device 1 does not need to be used for magnetic resonance scanning.

[0086] During the examination process, if the relative distance detected by the position sensor is less than the distance threshold, it means that the examination bed enters or leaves the magnet of the magnetic resonance imaging device or performs a scanning examination in a normal magnet environment, and the position range from when the examination bed enters the magnet to when the examination bed stops moving for scanning examination is the preset position.

[0087] Step three: the switch unit 4 controls the connection of the power supply circuit between the power module 3 and the wireless coil device 1 according to the enable signal, and the power module 3 supplies power to the wireless coil device 1 .

[0088] In this embodiment, the switch unit 4 can be an integrated chip with enable control, such as an analog switch; the enable signal sent by the coil identification module 6 can control the integrated chip to open and close the switch; or, the switch unit 4 can also be a switch circuit with enable control, and the switch circuit can be built with discrete devices such as BJT or MOS tube, and is opened when there is an enable signal, and is closed when there is no enable signal.

[0089] Specifically, the switch unit 4 controls the on / off of the power supply circuit between the power module 3 and the wireless coil device 1 by closing and opening the switch. When the switch unit 4 is closed, the power supply circuit between the power module 3 and the wireless coil device 1 is connected, and the power module 3 supplies power to the wireless coil device 1; when the switch unit 4 is opened, the power supply circuit between the power module 3 and the wireless coil device 1 is disconnected, and the wireless coil device 1 has no power supply device for power supply.

[0090] Example 3

[0091] This embodiment provides a magnetic resonance imaging device, including a magnet and an examination bed. The examination bed includes the wireless coil device 1 described above. The wireless coil device 1 includes a power module 3, a coil identification module 6, a switch unit 4 and a wireless coil 5.

[0092] Among them, the coil identification unit is used to identify the position of the wireless coil device 1; the switch unit 4 is used to control the on and off of the power supply circuit between the power module 3 and the local coil; when the coil identification unit recognizes that the wireless coil device 1 moves to a preset position, it outputs an enable signal to the switch unit 4, the switch unit 4 is closed and the power supply circuit is connected, and the power module 3 supplies power to the local coil.

[0093] In this embodiment, the wireless coil device 1 can be arranged inside the examination bed, or can be detachably installed on the examination bed.

[0094] Wherein, the magnet includes a superconducting magnet, a gradient coil, a body coil, etc. The gradient coil can generate additional magnetic fields in different planes. The (magnetic pulse) body coil deflects water in the human body during the magnetic resonance scanning examination;

[0095] Specifically, during the scanning process of the magnetic resonance imaging device, the superconducting magnet generates a uniform magnetic field around the examination bed, and the gradient coil adjusts the magnetic field into small parts with different magnetic field strengths to isolate specific body parts. Based on the body coil, most of the water molecules in the patient's body on the examination bed and the magnetic field move at the same frequency, and low-energy water molecules do not move at this frequency. The magnetic resonance imaging device emits radio waves with the same frequency as the magnetic field, and the low-energy water molecules absorb the radio wave energy and move along the magnetic field. When the emission of radio waves stops, the low-energy water molecules release the absorbed radio wave energy and return to the initial state. The magnetic resonance imaging device detects the released energy signal and converts it into a magnetic resonance image through an algorithm.

[0096] References throughout the specification to "one embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. In addition, the particular features, structures, or characteristics of any specific embodiment of the present invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0097] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0098] In addition, unless otherwise explicitly indicated, any marking arrows in the drawings should be regarded as exemplary only and not limiting. In addition, unless otherwise indicated, the term "or" used herein is generally intended to mean "and / or". In the case where the term is not clear because it is anticipated that the ability to separate or combine is provided, the combination of components or steps will also be regarded as indicated.

[0099] As used in the description herein and throughout the claims that follow, "a", "an", and "the" include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of "in" includes "in" and "on" unless otherwise indicated.

[0100] The above description of the illustrated embodiments of the present invention (including that described in the Abstract of the Specification) is not intended to be an exhaustive list or to limit the present invention to the precise form disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention as will be recognized and understood by those skilled in the art. As noted, these modifications may be made to the present invention in accordance with the above description of the embodiments described in the present invention, and these modifications will be within the spirit and scope of the present invention.

[0101] Systems and methods have been generally described herein as details that are helpful for understanding the present invention. In addition, various specific details have been given to provide an overall understanding of the embodiments of the present invention. However, those skilled in the relevant art will recognize that the embodiments of the present invention can be practiced without one or more specific details, or practiced using other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid confusion with various aspects of the embodiments of the present invention.

Claims

1. A wireless coil power control device, applied to a magnetic resonance imaging device, characterized in that: include: A power module, which supplies power to the wireless coil; A coil identification unit, used for identifying the position of the wireless coil, and sending an enabling signal when the coil identification unit identifies that the wireless coil moves to a preset position; The switch unit is connected between the power module and the wireless coil, and is used to control the on-off of the power supply circuit between the power module and the wireless coil. The switch unit is closed according to the enable signal from the coil identification unit to connect the power supply circuit.

2. The wireless coil power control device according to claim 1, characterized in that: The power module includes an energy storage unit and a power output unit; When the power supply circuit is connected, the power output unit transmits the electric energy in the energy storage unit to the wireless coil.

3. The wireless coil power control device according to claim 2, characterized in that: The switch unit is arranged between the energy storage unit and the power output unit, or between the power output unit and the wireless coil.

4. The wireless coil power control device according to claim 2, characterized in that: The energy storage unit is also connected to the coil identification unit to supply power to the coil identification unit.

5. The wireless coil power control device according to claim 1, characterized in that: The switch unit includes a first resistor, a second resistor, a third resistor, a MOS transistor and a bipolar junction transistor; The first end of the MOS transistor is connected to the coil identification unit and one end of the first resistor respectively, the second end is connected to one end of the second resistor, and the third end is grounded; The first end of the bipolar junction transistor is connected to the power module and one end of the third resistor respectively, the second end is connected to the other end of the second resistor, and the third end is connected to the wireless coil; The other end of the first resistor is grounded, and the other end of the second resistor is also connected to the other end of the third resistor.

6. The wireless coil power control device according to claim 1, characterized in that: The coil identification unit includes a Hall sensor, and the Hall sensor is used to detect the spatial magnetic field around the wireless coil. When the spatial magnetic field is greater than a preset magnetic field threshold, it is determined that the wireless coil moves to the preset position.

7. The wireless coil power control device according to claim 1, characterized in that: The coil identification unit includes a position sensor, which is used to detect the relative distance between the wireless coil and a preset body coil. When the relative distance is less than a preset distance threshold, it is determined that the wireless coil has moved to the preset position.

8. A wireless coil device, applied to a magnetic resonance imaging device, characterized in that: include: Wireless coil; as well as A wireless coil power control device as claimed in any one of claims 1 to 7.

9. The wireless coil device according to claim 8, characterized in that The wireless coil includes a local coil and a wireless data transmission module, and the switch unit is used to control the on-off of the power supply circuit between the power module and the local coil and the wireless data transmission module.

10. A magnetic resonance imaging device, characterized in that: include: a magnet; and, Check the bed; The examination bed includes the wireless coil device according to claim 8.

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