Measurement device for magnetic resonance radio frequency induced voltage of medical instrument

Abstract

The invention relates to a magnetic resonance radio frequency induced voltage measuring device for a medical instrument. The magnetic resonance radio frequency induced voltage measuring device comprises a signal acquisition module and a radio frequency measuring module, wherein the signal acquisition module is used for acquiring radio frequency induced voltage generated by a radio frequency magnetic field on a medical instrument in a magnetic resonance environment to obtain an original radio frequency induced voltage signal and inputting the original radio frequency induced voltage signal to the radio frequency measurement module; the radio frequency measurement module comprises an attenuation circuit, a resonance circuit and a detection circuit; wherein the attenuation circuit is used for performing power attenuation on an input original radio frequency induced voltage signal to obtain a first radio frequency signal; the resonance circuit is used for performing frequency selection on the first radio frequency signal to obtain a second radio frequency signal in a specified frequency band, and the specified frequency band is matched with the frequency of the radio frequency magnetic field; and the detection circuit is used for detecting the second radio frequency signal to obtain a target radio frequency induced voltage signal. Therefore, the radio frequency induced voltage generated by the radio frequency magnetic field on the medical instrument in the magnetic resonance environment can be accurately measured.

Description

Technical Field

[0001] The present disclosure relates to the technical field of medical devices, and in particular to a device for measuring magnetic resonance radio frequency induced voltage of medical devices. Background Art

[0002] Implantable medical devices such as implantable electrical stimulators are widely used in the treatment of certain neurological diseases such as Parkinson's disease, epilepsy, dystonia, etc., by implanting electrodes at the disease target site to apply electrical stimulation. At the same time, magnetic resonance imaging (MRI) is widely used in medicine as a radiation-free, high-resolution, high-contrast imaging method.

[0003] However, the radio frequency magnetic field in the magnetic resonance imaging system will induce an induced voltage on the electrodes and wires of the implantable electrical stimulator (this type of induced voltage induced by the radio frequency magnetic field can be called radio frequency induced voltage). The induced voltage is injected into the pulse generator of the implantable electrical stimulator, which will cause damage to the pulse generator and fail to achieve the expected therapeutic effect of the implantable electrical stimulator, and may even cause permanent damage to the human body.

[0004] Therefore, there is an urgent need for a radio frequency induced voltage testing device that can measure the induced voltage generated by the radio frequency magnetic field on medical devices in a magnetic resonance environment, so that the safe use conditions of medical devices in radio frequency scenarios such as magnetic resonance imaging can be evaluated based on the measured radio frequency induced voltage. Summary of the invention

[0005] In view of this, the present disclosure proposes a medical device magnetic resonance radio frequency induced voltage measurement device, which can accurately measure the radio frequency induced voltage generated by the radio frequency magnetic field on the medical device in a magnetic resonance environment.

[0006] According to one aspect of the present disclosure, a radio frequency induced voltage measurement device is provided, comprising: a signal acquisition module and a radio frequency measurement module; wherein the signal acquisition module is used to collect the radio frequency induced voltage generated by the radio frequency magnetic field on the medical device in the magnetic resonance environment, obtain the original radio frequency induced voltage signal and input it to the radio frequency measurement module; the radio frequency measurement module comprises an attenuation circuit, a resonance circuit and a detection circuit; wherein the attenuation circuit is used to perform power attenuation on the input original radio frequency induced voltage signal to obtain a first radio frequency signal; the resonance circuit is used to perform frequency selection on the first radio frequency signal to obtain a second radio frequency signal in a specified frequency band, and the specified frequency band matches the frequency of the radio frequency magnetic field; the detection circuit is used to perform detection on the second radio frequency signal to obtain a target radio frequency induced voltage signal.

[0007] In a possible implementation, the RF measurement module also includes: a first impedance matching circuit, used to perform impedance matching between the attenuation circuit and the resonant circuit, and transmit the first RF signal to the resonant circuit; a second impedance matching circuit, used to perform impedance matching between the resonant circuit and the detection circuit, and transmit the second RF signal to the detection circuit.

[0008] In one possible implementation, the detection circuit includes: a detection unit, which is used to detect the second RF signal to obtain a first envelope signal, wherein the first envelope signal is a signal whose frequency is below the RF band; a following unit, which is used to provide a DC bias voltage to the detection unit based on the second RF signal to offset the conduction voltage in the detection unit; a notch unit, which is used to attenuate the signal amplitude and current of the second RF signal flowing into the following unit, and input the DC bias voltage output by the following unit to the detection unit; a filtering unit, which is used to perform high-frequency filtering on the first envelope signal output by the detection unit to obtain a second envelope signal; and a voltage divider unit, which is used to perform proportional voltage division on the second envelope signal output by the filtering unit to reduce the amplitude of the second envelope signal to obtain the target RF induced voltage signal.

[0009] In a possible implementation, the device also includes: an analog-to-digital conversion front-end module, a control module, a communication module and a power supply module; the analog-to-digital conversion front-end module is used to perform impedance matching between the RF measurement module and the analog-to-digital conversion interface of the control module, and to filter the target RF induced voltage signal output by the RF measurement module and transmit the filtered target RF induced voltage signal to the analog-to-digital conversion interface of the control module; the control module is used to collect the target RF induced voltage signal input by the analog-to-digital conversion front-end module to the analog-to-digital conversion interface at a specified frequency, and convert the collected target RF induced voltage signal into a digital signal; the communication module is used to send the digital signal of the target RF induced voltage signal converted by the control module to a host computer outside the magnetic resonance environment; the power supply module is used to supply power to the RF measurement module, the analog-to-digital conversion front-end module, the control module and the communication module.

[0010] In a possible implementation, the device also includes an electromagnetic shielding box, and the RF measurement module, the analog-to-digital conversion front-end module, the control module, the communication module and the power supply module in the device are encapsulated in the electromagnetic shielding box; wherein the RF measurement module is individually encapsulated in an electromagnetic shielding box, and the encapsulated RF measurement module is installed in the electromagnetic shielding box by means of a plug-in connection; the device includes a plurality of packaged RF measurement modules, and different packaged RF measurement modules match the frequencies of different RF magnetic fields. The device measures the RF induced voltage generated on the medical device in RF magnetic fields of different frequencies by installing different packaged RF measurement modules.

[0011] In a possible implementation, the material of the electromagnetic shielding box and the electromagnetic shielding box includes: an electromagnetic shielding material generated by sequentially plating aluminum oxide and / or a conductive film on an aluminum alloy.

[0012] In a possible implementation, the communication module includes a wireless communication module or a wired communication module; the wireless communication module includes a Bluetooth module; the wired communication module includes a first optical fiber communication module; wherein, in the case where the communication module adopts the first optical fiber communication module, the device also includes: a second optical fiber communication module and a serial port communication module; wherein the second optical fiber communication module and the serial port communication module are outside the magnetic resonance environment; the first optical fiber communication module is used to convert the digital signal into an optical fiber signal and transmit it to the second optical fiber communication module via an optical fiber, and the second optical fiber communication module is used to convert the received optical fiber signal back into a digital signal and transmit it to the serial port communication module; the serial port communication module is used to convert the received digital signal into a serial port signal, and transmit the serial port signal to the host computer via a universal serial bus.

[0013] In a possible implementation, the signal acquisition module includes: a non-magnetic radio frequency probe, a radio frequency connecting line and a metal sheet; wherein the non-magnetic radio frequency probe is used to collect the original radio frequency induced voltage signal, and the non-magnetic radio frequency probe is connected to the position where the radio frequency induced voltage flows into the medical device; the radio frequency connecting line is used to transmit the original radio frequency induced voltage signal collected by the non-magnetic radio frequency probe to the radio frequency measurement module, and is connected to the ground terminal of the device; the metal sheet is used to be attached to the housing of the medical device and connected to the ground terminal of the device through the radio frequency connecting line.

[0014] In a possible implementation, the RF connecting line includes, from the inside to the outside, a RF core, a ground shielding layer and a protective layer, the RF core is used to transmit the original RF induced voltage signal collected by the non-magnetic RF probe to the RF measurement module, the ground shielding layer is used to shield the magnetic resonance environment and is connected to the ground end of the device, and the protective layer is used to protect the ground shielding layer and the RF core; the metal sheet is connected to the ground shielding layer through an extension wire.

[0015] In a possible implementation, the RF connecting line includes a first connecting wire and a second connecting wire; wherein the non-magnetic RF probe is connected to the RF measurement module through the first connecting wire; and the metal sheet is connected to the ground terminal of the device through the second connecting wire.

[0016] In a possible implementation, the device further includes: a host computer; the host computer is used to receive the digital signal sent by the communication module, and perform at least one operation of display, storage and human-computer interaction based on the received digital signal.

[0017] According to various aspects of the present disclosure, by utilizing a signal acquisition module and a radio frequency measurement module, it is possible to accurately measure the radio frequency induced voltage generated by the radio frequency magnetic field on a medical device in any magnetic resonance environment, thereby facilitating users to evaluate the safety of the medical device in the radio frequency magnetic field based on the measured radio frequency induced voltage.

[0018] Further features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

[0020] Figure 1 A schematic diagram of an application scenario of a radio frequency induced voltage testing device according to an embodiment of the present disclosure is shown.

[0021] Figure 2 A block diagram of a radio frequency induced voltage testing device according to an embodiment of the present disclosure is shown.

[0022] Figure 3 A structural schematic diagram of a signal acquisition module according to an embodiment of the present disclosure is shown.

[0023] Figure 4 A schematic structural diagram of a non-magnetic radio frequency probe according to an embodiment of the present disclosure is shown.

[0024] Figure 5 A schematic structural diagram of a radio frequency connecting line according to an embodiment of the present disclosure is shown.

[0025] Figure 6 A block diagram of another radio frequency induced voltage testing device according to an embodiment of the present disclosure is shown.

[0026] Figure 7 A block diagram of another radio frequency induced voltage testing device according to an embodiment of the present disclosure is shown.

[0027] Figure 8 A circuit structure schematic diagram of a detection circuit according to an embodiment of the present disclosure is shown.

[0028] Figure 9a A schematic diagram showing an original radio frequency induced voltage signal in a square wave envelope input mode according to an embodiment of the present disclosure.

[0029] Figure 9b A schematic diagram showing an original radio frequency induced voltage signal in a sinc envelope input mode according to an embodiment of the present disclosure.

[0030] Fig.10a According to an embodiment of the present disclosure, Figure 9a Schematic diagram of the target RF induced voltage signal in the square wave envelope output mode obtained by processing the original RF induced voltage signal.

[0031] Fig.10b According to an embodiment of the present disclosure, Figure 9b Schematic diagram of the target RF induced voltage signal in the sinc envelope output mode obtained by processing the original RF induced voltage signal.

[0032] Fig.11 A block diagram of another radio frequency induced voltage testing device according to an embodiment of the present disclosure is shown.

[0033] Fig.12 A block diagram of another radio frequency induced voltage testing device according to an embodiment of the present disclosure is shown.

[0034] Fig.13 A schematic diagram of an electromagnetic shielding box according to an embodiment of the present disclosure is shown.

[0035] Fig.14a A schematic diagram of a packaged radio frequency measurement module according to an embodiment of the present disclosure is shown.

[0036] Fig.14b A schematic diagram of a packaged radio frequency measurement module according to an embodiment of the present disclosure is shown.

[0037] Fig.15A schematic diagram showing a pluggable connection method according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0038] Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0039] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0040] The term "and / or" herein is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C can represent any one or more elements selected from the set consisting of A, B, and C. In the description of the present disclosure, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0041] It should be understood that the terms "first", "second", etc. in the claims, specifications and drawings of the present disclosure are used to distinguish different objects rather than to describe a specific order. The terms "include" and "comprise" used in the specifications and claims of the present disclosure indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0042] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present disclosure can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present disclosure.

[0043] It should be noted that the medical devices involved in the embodiments of the present disclosure may include implantable electrical stimulation systems, such as: implantable cardiac pacemakers, implantable neural stimulators, implantable muscle stimulators, deep brain stimulators (DBS) or other implantable electrical stimulation systems; of course, the medical devices involved in the embodiments of the present disclosure may also include any medical device in the art that is expected to evaluate the safe use conditions under the radio frequency magnetic field of the magnetic resonance environment, and the embodiments of the present disclosure are not limited to this.

[0044] It should be understood that the radio frequency magnetic fields in different magnetic resonance environments have different frequency magnitudes, and the embodiments of the present disclosure do not limit the frequency magnitude of the radio frequency magnetic field in the magnetic resonance environment.

[0045] For example, in order to better understand the RF induced voltage test device provided in the embodiment of the present disclosure, the embodiment of the present disclosure takes the DBS system as an example and provides Figure 1 A schematic diagram of an application scenario of a radio frequency induced voltage test device is shown in FIG. Figure 1 As shown, a test environment is built in a magnetic resonance scene, including an MRI scanning room (i.e., inside the magnetic resonance environment) and an MRI operation room (i.e., outside the magnetic resonance environment to prevent the host computer 07 from being interfered by strong magnetic fields). A sodium chloride NaCl solution can be poured into the human body model 01 to form a human body model 01 that simulates the electromagnetic parameters of the human body.

[0046] Considering that the current mainstream medical magnetic resonance imaging devices are 1.5T main magnetic field MRI and 3.0T main magnetic field MRI, under the action of the main magnetic field, the hydrogen nuclei in the human body will be arranged along the direction of the magnetic field, with some arranged in the direction of the magnetic field and the other part arranged in the direction of the anti-magnetic field, forming a net magnetization vector. At the same time, the hydrogen nuclei will rotate around the main magnetic field under the action of the external magnetic field. The frequency of this rotation is called the Larmor frequency, and the formula is f 0 =γB 0 , where γ is the magnetic gyroscopic ratio of the proton. For hydrogen nuclei, the value of γ is about 42.58MHz / T, B 0 is the main magnetic field strength, f 0 is the resonant frequency of a particular spin. The frequency of the RF magnetic field is the frequency of the electromagnetic waves used to excite the hydrogen nuclei. In an MRI system, a specific frequency of RF pulses is emitted to cause the hydrogen nuclei to transition from a low energy state to a high energy state. To cause this transition of the hydrogen nuclei, the frequency of the RF pulses must match the Larmor frequency, i.e., f RF =f 0 , so that the RF energy can be absorbed by the hydrogen nuclei, causing their magnetic moments to flip, so that the hydrogen nuclei release energy and return to the ground state after the RF pulse stops. The energy released during this period is detected by the receiving coil and used to reconstruct the image. Therefore, Figure 1The radio frequency frequency in the magnetic resonance environment where the radio frequency induced voltage testing device 00 shown in FIG. 1 is located includes but is not limited to the radio frequency frequency corresponding to the main magnetic field of 1.5T or 3.0T.

[0047] in, Figure 1 The DBS system placed in a human body model 01 in a medium magnetic resonance environment includes a long wire 02 of an electrode and a pulse generator 03 connected to the long wire 02. The excitation of the radio frequency magnetic field in the magnetic resonance environment can induce the long wire 02 to generate a radio frequency induced voltage, and the radio frequency induced voltage generated on the long wire 02 will be injected into the pulse generator 03. The input terminal "-" of the radio frequency induced voltage measuring device 00 proposed in the embodiment of the present disclosure is connected to the housing of the pulse generator 03, and the input terminal "+" is connected to the feedthrough of the pulse generator 03, so that the radio frequency induced voltage measuring device 00 can be used to measure the target radio frequency induced voltage signal of the radio frequency induced voltage injected into the pulse generator 03 (that is, the radio frequency induced voltage generated on the long wire 02).

[0048] Among them, the radio frequency induced voltage measuring device 00 can further convert the measured target radio frequency induced voltage signal into a transistor-transistor logic level (Transistor-Transistor Logic, TTL) signal, and then convert the TTL signal into an optical fiber signal. The optical fiber signal is transmitted from the optical fiber 04 to the optical fiber signal adapter module 05 in the MRI operating room. The optical fiber signal adapter module 05 converts the optical fiber signal into a TTL signal, and then converts the TTL signal into a serial port signal. The serial port signal is then transmitted to the host computer 07 through a universal serial bus (Universal Serial Bus, USB) extension cable 06, so that the host computer 07 obtains the serial port signal, thereby realizing communication between the host computer 07 and the slave computer (i.e., the radio frequency induced voltage measuring device 00).

[0049] It should be understood that the above Figure 1 An application scenario of the RF induced voltage test device shown is a possible implementation method provided by the embodiment of the present disclosure. In fact, those skilled in the art can build corresponding test environments for different medical devices based on the RF induced voltage test device proposed in the embodiment of the present disclosure, as long as the RF induced voltage test device proposed in the embodiment of the present disclosure can be used to measure the RF induced voltage generated by the RF magnetic field on the medical device in the magnetic resonance environment.

[0050] The following Figures 2 to 15 The radio frequency induced voltage testing device proposed in the embodiment of the present disclosure is introduced in detail.

[0051] Figure 2 FIG. 1 is a block diagram of a radio frequency induced voltage testing device 00 according to an embodiment of the present disclosure. Figure 2As shown, the device 00 includes: a signal acquisition module 10 and a radio frequency measurement module 11.

[0052] The signal acquisition module 10 is used to collect the RF induced voltage generated by the RF magnetic field on the medical device (such as the wire in the medical device) in the magnetic resonance environment, obtain the original RF induced voltage signal and input it to the RF measurement module 11.

[0053] In one possible implementation, Figure 3 As shown, the signal acquisition module 10 may include: a non-magnetic radio frequency probe 101, a radio frequency connecting line 102 and a metal sheet 103;

[0054] The non-magnetic radio frequency probe 101 is used to collect the original radio frequency induced voltage signal, and the non-magnetic radio frequency probe is connected to the position where the radio frequency induced voltage flows into the medical device;

[0055] The RF connection line 102 is used to transmit the original RF induced voltage signal collected by the non-magnetic RF probe 101 to the RF measurement module 11 and is connected to the ground terminal of the device 00;

[0056] The metal sheet 103 is used to be attached to the housing of the medical device and is connected to the ground terminal of the device 00 through the radio frequency connection line 102 .

[0057] Among them, those skilled in the art can also design and manufacture the non-magnetic RF probe 101 according to actual needs (such as the hardware structure of the medical device, etc.). The embodiment of the present disclosure does not limit the structure, material and shape of the non-magnetic RF probe 101. For example, it can be a non-magnetic spring probe as long as it can realize the function of collecting the original RF induced voltage signal of the RF induced voltage on the medical device.

[0058] For example, Figure 4 A schematic diagram of the structure of a non-magnetic radio frequency probe 101 is shown, Figure 4As shown, the non-magnetic RF probe 101 includes a probe head 1011, a RF core 1012, a support layer 1013 and a connector 1014, wherein the probe head 1011 is used to be inserted into a position in the medical device where a RF induced voltage flows (for example, the feedthrough of the pulse generator 03 in the above-mentioned DBS system, specifically, it can be a channel of a long wire 02 connecting electrodes in the feedthrough), the RF core 1012 is used to transmit the original RF induced voltage signal collected by the probe head 1011, the support layer 1013 is used to protect and support the probe head 1011 and the RF core 1012, one end of the support layer 1013 is connected to the probe head 1011, and the other end is connected to the connector 1014, and the connector 1014 is used to be connected to the RF connecting line 102. The support layer 1013 may be a hollow bolt with an external thread, the middle of the hollow bolt passes through the RF wire core 1012, and the external thread may be fixed in a fixing frame, so that the entire non-magnetic RF probe 101 is fixed in position when collecting the original RF induced voltage signal. The connector 1014 may use, for example, an SMA (SubMiniature version A) connector, and of course, any other known connection method in the art may be used, which is not limited by the embodiments of the present disclosure.

[0059] Alternatively, if Figure 5 As shown, the RF connecting line 102 may include an RF core 1021, a ground shielding layer 1022 and a protective layer 1023 from the inside to the outside, the RF core 1011 is used to transmit the original RF induced voltage signal collected by the non-magnetic RF probe 101 to the RF measurement module 11, the ground shielding layer 1022 is used to shield the magnetic resonance environment and is connected to the ground end of the device 00, and the protective layer 1023 is used to protect the ground shielding layer 1022 and the RF core 1011; the metal sheet 103 is connected to the ground shielding layer 1022 through an extension wire 1024; wherein, two connectors 1025 and a connector 1026 may also be provided at both ends of the RF connecting line 102, one connector 1025 may be connected to the non-magnetic RF probe 101, and the other connector 1026 may be connected to the RF measurement module 11, so as to realize the transmission of the original RF induced voltage signal collected by the non-magnetic RF probe 101 to the RF measurement module 11.

[0060] Exemplarily, the connectors 1025 and 1026 at both ends of the RF connecting line 102 can use SMA connectors, and the connectors 1025 and 1026 can both be SMA female connectors, so that an SMA male connector can be provided on the RF measurement module 11, and the connector 1014 on the above-mentioned non-magnetic RF probe 101 can be an SMA male connector, thereby, the SMA female connector 1026 on the RF connecting line 102 can be connected via the SMA male connector on the RF measurement module 11, and the SMA female connector 1025 on the RF connecting line 102 can be connected to the SMA male connector 1014 on the above-mentioned non-magnetic RF probe 101; based on this, by The probe head 1011 of the RF probe 101 is connected to the position where the RF induced voltage flows into the medical device, so that the collected original RF induced signal can be input into the RF measurement module 11, wherein the protective layer 1023 plays a protective role outside the ground shielding layer 1022, and the ground shielding layer 1022 is responsible for shielding the external magnetic resonance environment interference and is connected to the GND end of the device 00. The ground shielding layer 1022 is led out through the metal sheet 103, and the metal sheet 103 is connected to the outer shell of the medical device. The RF core 1011 in the RF connecting line 102 can be connected to the probe head 1011 through the SMA male connector via the RF core 1012 in the non-magnetic RF probe 101.

[0061] Optionally, the non-magnetic RF probe 101 and the RF measurement module 11 can be directly connected by a wire, and connected by the wire to a metal sheet 103 attached to the outer shell of the medical device, wherein the conductive area can be increased by attaching the metal sheet 103 to the outer shell of the medical device; thus, the above-mentioned RF connecting line 102 can also include a first connecting wire and a second connecting wire; wherein the non-magnetic RF probe 101 can be connected to the RF measurement module 11 via the first connecting wire; the metal sheet 103 can be connected to the ground terminal of the device 00 via the second connecting wire.

[0062] It should be understood that in order to ensure the safety of the entire device 00, a ground terminal (GND terminal) is usually set in the device 00, and the RF connection line 102 can also be connected to the ground terminal of the device 00, and the metal sheet 103 attached to the medical device housing can be connected to the ground terminal of the device 00 through the RF connection line 102, which is equivalent to using the metal sheet 103 as the negative input terminal and the non-magnetic RF probe 101 as the positive input terminal, thereby realizing the RF induced voltage collected on the medical device by the signal acquisition module 10. Among them, the metal sheet 103 can be made of metal materials known in the art, such as copper foil, copper sheet, etc. The embodiment of the present disclosure does not limit the shape, size and material of the metal sheet 103, as long as it can achieve the desired function.

[0063] It should be noted that the various implementation methods of the signal acquisition module 10 provided in the above-mentioned embodiments of the present disclosure are some possible implementation methods provided by the embodiments of the present disclosure. In fact, those skilled in the art can adopt RF wires and RF devices known in the art to make the signal acquisition module 10 into a standardized module, so as to realize the connection between the signal acquisition module 10 and the medical device and the signal acquisition and signal transmission functions of the signal acquisition module 10, and the embodiments of the present disclosure are not limited to this.

[0064] like Figure 2 As shown, the radio frequency measurement module 11 includes: an attenuation circuit 110, a resonance circuit 111 and a detection circuit 112;

[0065] The attenuation circuit 110 is used to perform power attenuation on the input original radio frequency induced voltage signal to obtain a first radio frequency signal;

[0066] The resonant circuit 111 is used to select the frequency of the first radio frequency signal to obtain a second radio frequency signal in a specified frequency band, and the specified frequency band matches the frequency of the radio frequency magnetic field;

[0067] The detection circuit 112 is used to detect the second radio frequency signal to obtain a target radio frequency induced voltage signal.

[0068] Considering that there may be impedance mismatch between the attenuation circuit 110 and the resonant circuit 111 and between the resonant circuit 111 and the detection circuit 112 in actual situations, in a possible implementation, Figure 6 As shown, the radio frequency measurement module 11 may also include:

[0069] A first impedance matching circuit 113, used for performing impedance matching between the attenuation circuit 110 and the resonance circuit 111, and transmitting the first RF signal to the resonance circuit 111;

[0070] The second impedance matching circuit 114 is used to perform impedance matching between the resonant circuit 111 and the detection circuit 112 , and transmit the second RF signal to the detection circuit 112 .

[0071] Among them, those skilled in the art can use the impedance matching circuit design method known in the art to design the first impedance matching circuit 113 and the second impedance matching circuit 114, as long as they can achieve the impedance matching function required to be achieved, and the embodiments of the present disclosure are not limited to this. For example, if the impedance of the detection circuit 112 is 50 ohms, the impedance of the resonant circuit 111 can be matched to 50 ohms and matched with the detection circuit 112 through the second impedance matching circuit 114; wherein, the reflection of the RF signal can be reduced through impedance matching.

[0072] Among them, the attenuation circuit 110 can, for example, adopt a two-stage π-type attenuator known in the art, which is composed of a high-power thick film resistor and a microstrip line. The high-power original RF induced voltage signal is attenuated after passing through the attenuator and flows into the subsequent circuit; or, the attenuation circuit 110 can also use an RF transformer, which is composed of an RF coil, a transformer frame, etc., and is matched with an adjustable capacitor and an inductor, and can also have a resonant frequency selection function, which is not limited to the embodiments of the present disclosure.

[0073] The resonant circuit 111 is composed of a radio frequency winding inductor and a capacitor. The composition of the resonant circuit 111 may be different for radio frequency magnetic fields of different frequency bands, but the function is to select the frequency band signal corresponding to the frequency of the radio frequency magnetic field and filter out other frequency band signals. Of course, other resonant circuits known in the art may also be used, and the embodiments of the present disclosure are not limited to this.

[0074] Among them, Figure 7 As shown, the detection circuit 112 may include, for example:

[0075] The detection unit 1121 is used to detect the second radio frequency signal to obtain a first envelope signal, where the first envelope signal is a signal with a frequency below the radio frequency band;

[0076] The follower unit 1122 is used to provide a DC bias voltage to the detector unit 1121 based on the second radio frequency signal to offset the conduction voltage in the detector unit 1121;

[0077] The notch unit 1123 is used to attenuate the signal amplitude of the second RF signal flowing into the follower unit 1122, and to input the DC bias voltage output by the follower unit 1123 into the detector unit 1121;

[0078] The filtering unit 1124 is used to perform high-frequency filtering on the first envelope signal output by the detection unit 1121 to obtain a second envelope signal;

[0079] The voltage dividing unit 1125 is used to divide the second envelope signal output by the filtering unit 1124 in equal proportion to reduce the amplitude of the second envelope signal to obtain a target radio frequency induced voltage signal.

[0080] It should be understood that those skilled in the art can design a specific circuit structure of the detection circuit 112 according to the functions of each unit in the detection circuit 112, and the embodiments of the present disclosure are not limited to this. Figure 8 A schematic diagram of the circuit structure of a detection circuit 112 is shown, as shown in FIG. Figure 8As shown, the detection diode D1, the capacitor C1 and the resistor R2 constitute a detection unit 1121 (also referred to as a basic diode detection circuit); the resistor R2 and the resistor R4 constitute a voltage divider unit 1125, which is responsible for proportionally dividing the low-frequency second envelope signal to reduce the amplitude; the capacitor C1 and the resistor R2 constitute a filter unit 1124 (also referred to as an RC filter circuit), which is responsible for filtering out the high-frequency noise in the first envelope signal after detection by the detection unit 1121 to improve the signal purity; the operational amplifier constitutes a follower unit 1122, wherein the first terminal of the operational amplifier outputs a DC bias voltage, the second terminal inputs the second RF signal, and the third terminal The forward voltage of the input diode D2 is connected, the 4th terminal is connected to the negative power supply voltage (VCC-), and the 8th terminal is connected to the positive power supply voltage (VCC+); the diode D2 and D1 are the same Schottky diodes, and the diode D2 is also connected to the resistor R3 and the capacitor C2 to jointly generate the forward voltage of the diode D2; the capacitor C3 and the inductor L1 constitute a notch unit 1123 (also called an LC notch filter), and the DC bias voltage output by the operational amplifier is connected to the input end of the detection diode D1 through the notch unit 1123 to provide a DC bias voltage to offset the forward voltage of the diode D1, so that the diode detection unit 1121 is zero biased. Among them, since the voltage of the second RF signal input to the diode D1 end may be greater than the power supply voltage of the operational amplifier and cause damage to the operational amplifier, by adding a trap unit 1123 composed of a capacitor C3 and an inductor L1, the trap unit 1123 can have a larger impedance at the frequency of the RF magnetic field (such as 64MHz or 128MHz, etc.), but the impedance to the DC signal is approximately 0, thereby attenuating the high-power second RF signal flowing into the operational amplifier, and allowing the DC bias voltage output by the cloud amplifier to pass losslessly.

[0081] It is understandable that the above Figure 8 The circuit structure of each circuit in the detection circuit 112 shown is a possible implementation method provided by the embodiment of the present disclosure. In fact, under the guidance of the embodiment of the present disclosure, those skilled in the art can design the specific circuit structure of the above detection circuit 112 according to actual needs, as long as the detection function they need to achieve can be achieved. For example, in addition to using a diode for detection, the detection unit 1121 in the above detection circuit 112 can also use a transistor to achieve voltage doubling detection or full-wave detection, and can also combine an operational amplifier with a diode or a transistor to achieve precise linear half-wave detection and precise linear full-wave detection, etc., and the embodiment of the present disclosure does not limit this. The detection circuit 112 can be used to detect the input second RF signal into a low-frequency target RF induced voltage signal, so that the amplitude of the input second RF signal can be as low as 0V.

[0082] It can be known that the original RF induced voltage signal input into the RF measurement module 11 may be, for example, Figure 9aor Figure 9b Any of the two signals shown, where Figure 9a shows the original RF induced voltage signal of a square wave envelope input mode, Figure 9b shows the original RF induced voltage signal of a sinc envelope input mode, Figure 9a and Figure 9b The pulse width, period and peak value of the signal are also shown; it should be understood that the shape of the original RF induced voltage signal is determined by the scanning sequence in the MRI scene, for example. Figure 9a and Figure 9b The forms shown are some possible forms provided by the embodiments of the present disclosure. The original RF induced voltage signal may also be in any other form, and the amplitude may range from 0 volts to tens of volts. However, the target RF induced voltage signal output by the RF measurement module 11 may be a detection envelope form of the input original RF induced voltage signal. Therefore, the output target RF induced voltage signal may also be called a detection signal. For example, Fig.10a Show Figure 9a The target RF induced voltage signal in the square wave envelope output mode is obtained by processing the original RF induced voltage signal. Fig.10b Show Figure 9b The target RF induced voltage signal in the sinc envelope output mode is obtained by processing the original RF induced voltage signal.

[0083] Considering that the strong magnetic field in the magnetic resonance environment will cause damage and interference to the electromagnetic devices in the host computer, and the magnetic force on ferromagnetic objects in the strong magnetic field can easily cause danger, therefore, Figure 1 As shown, the measuring device 00 can be connected to a host computer outside the magnetic resonance environment to perform communication transmission between the measuring device 00 and the host computer, so that the user can view the measurement results through the host computer. Therefore, in order to realize the operation of the measuring device 00 and the communication connection with the host computer, in a possible implementation, as shown in FIG. Fig.11 As shown, the above device 00 may also include: an analog-to-digital conversion front-end module 12, a control module 13, a communication module 14 and a power supply module 15;

[0084] The analog-to-digital conversion front-end module 12 is used to perform impedance matching between the analog-to-digital conversion interface of the radio frequency measurement module 11 and the control module 13, and to filter the target radio frequency induced voltage signal output by the radio frequency measurement module 11 and transmit the filtered target radio frequency induced voltage signal to the analog-to-digital conversion interface of the control module 13;

[0085] The control module 13 is used to collect the target radio frequency induced voltage signal input to the analog-to-digital conversion interface by the analog-to-digital conversion front-end module 12 at a specified frequency, and convert the collected target radio frequency induced voltage signal into a digital signal;

[0086] The communication module 14 is used to send the digital signal of the target radio frequency induced voltage signal converted by the control module 13 to a host computer outside the magnetic resonance environment;

[0087] The power supply module 15 is used to supply power to the radio frequency measurement module 11 , the analog-to-digital conversion front-end module 12 , the control module 13 and the communication module 14 .

[0088] Among them, the analog-to-digital conversion front-end module 12 can be composed of two operational amplifiers and an RC low-pass filter, for example, to filter the target RF induced voltage signal after detection and voltage division and impedance match it to the analog-to-digital conversion interface adaptation impedance of the control module 13; specifically, the first operational amplifier is used as a follower and has an impedance matching function. There is a low-pass RC filter between the first operational amplifier and the second operational amplifier, which is responsible for filtering out high-frequency signals and improving signal purity. The second operational amplifier is still used as a follower, and the output end of the analog-to-digital conversion front-end module 12 is connected to the pin of the analog-to-digital conversion interface of the control module 13. Alternatively, the analog-to-digital conversion front-end module 12 can also use an LC filter or an operational amplifier to form an LC low-pass filter or a low-pass filter of the Butterworth, Chebyshev, etc. It should be understood that the embodiment of the present disclosure does not limit the specific circuit structure of the analog-to-digital conversion front-end module 12, as long as the disclosure required to be realized can be achieved.

[0089] Among them, the control module 13 can use electronic devices with logic processing capabilities known in the art, for example, one or more application-specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field-programmable gate arrays (FPGA), general-purpose processors, controllers, microcontrollers, microprocessors, etc., which are not limited to the embodiments of the present disclosure. Control 13 can realize circuit control of other modules in device 00, including data processing and communication, and needs to be able to meet the requirements of circuit control and signal acquisition rate.

[0090] It should be understood that the control module 13 may generally be provided with an analog-to-digital conversion interface and an analog-to-digital converter to convert the received analog signal into a digital signal; illustratively, the microcontroller generally integrates: a large-capacity FLASH memory used as a program memory and supporting self-programming operations; an analog-to-digital signal converter; a serial port; a timer and other electronic components. The control module 13, as the control core of the entire device 00, has the signal acquisition function of acquiring the target radio frequency induced voltage signal input to the analog-to-digital conversion interface by the analog-to-digital conversion front-end module 12 at a specified frequency; and it may also have the function of converting the acquired analog signal into a digital signal, and the function of encoding the digital signal with a custom protocol, so as to control the communication module 14 to send the digital signal of the target radio frequency induced voltage signal converted by the control module 13 to the host computer.

[0091] Optionally, the communication module 14 may be a wired communication module; wherein the wired communication module may include a first optical fiber communication module; Fig.12 As shown, in the case where the communication module 14 adopts the first optical fiber communication module, the device 00 further includes: a second optical fiber communication module 16 and a serial port communication module 17; wherein the second optical fiber communication module 16 and the serial port communication module 17 are outside the magnetic resonance environment;

[0092] The first optical fiber communication module 14 is used to convert the digital signal into an optical fiber signal and transmit it to the second optical fiber communication module 16 through the optical fiber. The second optical fiber communication module 16 is used to convert the received optical fiber signal back into a digital signal and transmit it to the serial communication module 17;

[0093] The serial communication module 17 is used to convert the received digital signal into a serial signal, and transmit the serial signal to the host computer 22 via a universal serial bus.

[0094] It should be understood that those skilled in the art can adopt signal conversion technology known in the art to construct the specific circuit structure of the first fiber optic communication module 14, the second fiber optic communication module 16 and the serial communication module 17 as long as they can achieve their respective functions, and the embodiments of the present disclosure are not limited to this.

[0095] The digital signal of the target RF induced voltage signal may be, for example, a TTL signal, and the serial communication module 17 may transmit the serial signal to the USB port of the host computer 22 through an extension cable of the universal serial bus USB, and the host computer 22 may convert the received serial signal into a desired digital signal or analog signal, and may have functions such as real-time display, storage, and interaction. The host computer may be, for example, an electronic device such as a computer, a notebook computer, or the like, which is not limited in the embodiments of the present disclosure.

[0096] Optionally, the communication module 14 can also adopt a wireless communication module; wherein the wireless communication module can include a Bluetooth module; wherein, when the communication module 14 adopts a Bluetooth module, the Bluetooth module can be a Bluetooth function module provided by the control module 13 (such as a microcontroller) or a Bluetooth chip, and combined with a balun circuit, a Bluetooth antenna, etc., to realize the reception and transmission of Bluetooth signals, that is, the digital signal can be sent to the host computer 22 via the Bluetooth mode.

[0097] In the embodiments of the present disclosure, the signal transmission method implemented by optical fiber communication or Bluetooth communication can avoid the influence of radio frequency magnetic field on signal transmission as much as possible, which is conducive to the lossless transmission of digital signals to the host computer. It should be understood that the various implementation methods of the communication module 14 provided in the above embodiments of the present disclosure are some possible implementation methods provided in the embodiments of the present disclosure. In fact, those skilled in the art can implement the above communication module 14 based on wired communication technology or wireless communication technology known in the art, and the embodiments of the present disclosure are not limited to this.

[0098] In actual applications, the control module 13 can control the communication module 133 in real time to send the digital signal of the target RF induced voltage signal converted by the control module 13 to the host computer 22, or a storage module can also be set in the device 00, and the control module 13 can store the converted digital signal in the storage module, so that the control module 13 can asynchronously control the communication module 133 to send the digital signal stored in the storage module to the host computer 22, and the embodiments of the present disclosure are not limited to this.

[0099] In a possible implementation, the device may further include: a host computer 22; the host computer 22 is used to receive the digital signal sent by the communication module 14, and perform at least one operation of displaying, saving and human-computer interaction based on the received digital signal.

[0100] Among them, the power supply module 15 can adopt a power supply circuit design known in the art. For example, the power supply module 15 may include a battery and a matching power management circuit, wherein the battery may be a lithium-ion rechargeable battery, and the power can be replenished by replacing the battery or charging after the battery is exhausted; the power management circuit may be composed of voltage conversion, rectification and filtering circuits, voltage stabilization circuits, etc., for realizing power supply control of each module in the entire device; or, the power management circuit may also include rectification and filtering circuits, charging management and protection circuits, etc. to realize rechargeable power management, which is not limited to this embodiment of the present disclosure.

[0101] As described above, when measuring the RF induced voltage on the medical device, the device 00 will be in a magnetic resonance environment. In order to shield the strong electromagnetic interference of the magnetic resonance environment on each module in the device 00, in a possible implementation, as Fig.13As shown, the device 00 also includes an electromagnetic shielding box 15, and the radio frequency measurement module 11, the analog-to-digital conversion front-end module 12, the control module 13, the communication module 14 and the power supply module 15 in the device 00 are encapsulated in the electromagnetic shielding box 15; wherein, a power switch 16 can also be provided on the electromagnetic shielding box 15 for starting or shutting down the device 00, and a fiber optic interface 17 can also be provided for connecting to an external optical fiber to transmit the fiber optic signal converted by the first fiber optic communication module.

[0102] Among them, Fig.14a As shown, the RF measurement module 11 can be packaged separately using an electromagnetic shielding box 115, wherein a connector 116 (such as an SMA male connector) can also be provided on the RF measurement module 11 for connecting to the signal acquisition module 10 (for example, connecting the SMA female connector 1026 on the RF connecting line 102 in the signal acquisition module 10 via the SMA male connector 116 on the RF measurement module 11), and the center of the connector 116 contains an RF core, which can receive and transmit the original RF induced voltage signal collected by the signal acquisition module 10 to the RF measurement module 11, wherein the packaged RF measurement module 11 can be installed in the electromagnetic shielding box 15 by means of plug-in connection.

[0103] Among them, those skilled in the art can use a pluggable connection method known in the art to install the packaged RF measurement module 11 in the electromagnetic shielding box 15 by a pluggable connection method. For example, Fig.14b As shown, the radio frequency measurement module 11 may also be provided with a pluggable connector 117, such as Fig.15 The electromagnetic shielding box 15 shown may also be provided with a spring probe array 18. When the RF measurement module 11 is inserted into the electromagnetic shielding box 15, the pluggable connector 117 on the RF measurement module 11 is in contact with the spring probe array 18 in the electromagnetic shielding box 15, thereby realizing the pluggable design of the packaged RF measurement module 11 and ensuring reliable electrical connection. It should be understood that the other end of the spring probe array 18 may be connected to the module conversion front-end module 12, so as to transmit the target RF induced voltage signal measured by the RF measurement module 11 to the control module 13 through the module conversion front-end module 12.

[0104] In practical applications, those skilled in the art can use materials known in the art that can shield electromagnetic fields to manufacture the above-mentioned electromagnetic shielding boxes and electromagnetic shielding boxes. For example, electromagnetic shielding boxes and electromagnetic shielding boxes can be made of materials such as aluminum alloy or brass alloy. By sealing the circuit in the metal alloy shell, strong external electromagnetic interference can be shielded; optionally, the embodiment of the present disclosure also provides a material that is both lightweight and can achieve a strong electromagnetic shielding effect to construct the electromagnetic shielding box and the electromagnetic shielding box. Specifically, the materials of the electromagnetic shielding box and the electromagnetic shielding box may include: electromagnetic shielding materials generated by sequentially plating aluminum oxide and / or a conductive film on an aluminum alloy (for example, the electromagnetic shielding material may be a synthetic material generated by plating a layer of aluminum oxide on an aluminum alloy and then plating a layer of conductive film on the aluminum oxide); wherein the conductive film may, for example, be a silver-containing conductive film, or other conductive films containing conductive ions, which is not limited by the embodiment of the present disclosure. It should be understood that the embodiment of the present disclosure does not limit the specific manufacturing method of the above-mentioned electromagnetic shielding material and the specific manufacturing method of the electromagnetic shielding box and the electromagnetic shielding box.

[0105] It should be noted that the above Fig.14a , Fig.14b as well as Fig.15 The packaged RF measurement module 11 and the connection method with the electromagnetic shielding box 15 shown are a possible implementation method provided by the embodiment of the present disclosure. In fact, those skilled in the art can, under the guidance of the embodiment of the present disclosure, customize the hardware structure of the packaged RF measurement module 11 and customize the pluggable connection method between the packaged RF measurement module 11 and the electromagnetic shielding box 15, and the embodiment of the present disclosure does not limit this.

[0106] As described above, the frequencies of the RF magnetic field in different magnetic resonance environments may be different. Therefore, a variety of packaged RF measurement modules 11 can be manufactured based on the frequencies of different RF magnetic fields. That is, the device 00 can include a variety of packaged RF measurement modules, and different packaged RF measurement modules match the frequencies of different RF magnetic fields. The RF induced voltage generated on the medical device in the RF magnetic field of different frequencies can be measured by installing different packaged RF measurement modules in the device 00. In this way, the corresponding RF measurement module 11 can be selected for detection according to the frequency of the RF magnetic field, so that the RF induced voltage at any RF frequency can be measured, and the RF induced voltage with an amplitude range of at least 0 to 70V can be measured.

[0107] According to the RF induced voltage measurement device of the embodiment of the present disclosure, by utilizing a signal acquisition module and a RF measurement module, it is possible to accurately measure the RF induced voltage generated by the RF magnetic field on a medical device in any magnetic resonance environment, thereby facilitating the user to evaluate the safety of the medical device in the RF magnetic field based on the measured RF induced voltage.

[0108] In response to the need for measuring radio frequency induced voltage in a magnetic resonance environment, the embodiments of the present disclosure provide a radio frequency induced voltage measuring device, which can measure the radio frequency induced voltage generated by the radio frequency magnetic field on the wires or electrodes in the medical device in the magnetic resonance environment through a signal sampling module and a radio frequency measurement module, and then transmit the measured results to a host computer outside the magnetic resonance environment through a communication module, and perform real-time display and human-computer interaction through the host computer.

[0109] The radio frequency induced voltage measurement device proposed in the embodiment of the present disclosure can realize the measurement of zero-bias radio frequency induced voltage in a wide power range under the MRI environment, and has a high application value for the compatibility and safety verification of implantable medical devices in the magnetic resonance environment. In addition, by adopting the communication method that can be used in the magnetic resonance environment (such as optical fiber communication or Bluetooth communication), the radio frequency induced voltage signal can be viewed and saved in real time, which facilitates the research on radio frequency induced voltage and the safety verification of related devices in the magnetic resonance environment. In addition, the radio frequency measurement module 11 adopts a pluggable design. For application scenarios under radio frequency magnetic fields of different frequency bands, the radio frequency measurement module 11 of the corresponding frequency band can be selected according to the needs, and it is compatible with radio frequency magnetic fields of different frequency bands in various magnetic resonance environments. In addition, by adopting various communication methods, the digital signal of the radio frequency induced voltage can be collected, viewed and saved in real time. The electromagnetic shielding box and the electromagnetic shielding box are used as the shell to shield the strong electromagnetic interference in the magnetic resonance environment.

[0110] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A radio frequency induced voltage measuring device, characterized in that: include: Signal acquisition module and radio frequency measurement module; The signal acquisition module is used to collect the radio frequency induced voltage generated by the radio frequency magnetic field on the medical device in the magnetic resonance environment, obtain the original radio frequency induced voltage signal and input it into the radio frequency measurement module; The radio frequency measurement module includes an attenuation circuit, a resonance circuit and a detection circuit; Wherein, the attenuation circuit is used to perform power attenuation on the input original radio frequency induced voltage signal to obtain a first radio frequency signal; The resonant circuit is used to perform frequency selection on the first radio frequency signal to obtain a second radio frequency signal in a specified frequency band, wherein the specified frequency band matches the frequency of the radio frequency magnetic field; The detection circuit is used to detect the second radio frequency signal to obtain a target radio frequency induced voltage signal.

2. The device according to claim 1, characterized in that The radio frequency measurement module also includes: a first impedance matching circuit, configured to perform impedance matching between the attenuation circuit and the resonance circuit, and transmit the first radio frequency signal to the resonance circuit; The second impedance matching circuit is used to perform impedance matching between the resonant circuit and the detection circuit, and transmit the second radio frequency signal to the detection circuit.

3. The device according to claim 1, characterized in that The detection circuit comprises: a detection unit, configured to detect the second radio frequency signal to obtain a first envelope signal, wherein the first envelope signal is a signal having a frequency below the radio frequency band; A follower unit, configured to provide a DC bias voltage to the detector unit based on the second radio frequency signal, so as to offset a conduction voltage in the detector unit; A notch unit, used for attenuating the signal amplitude and current of the second radio frequency signal flowing into the follower unit, and allowing the DC bias voltage output by the follower unit to be input into the detection unit; A filtering unit, used for performing high-frequency filtering on the first envelope signal output by the detection unit to obtain a second envelope signal; The voltage dividing unit is used to perform proportional voltage division on the second envelope signal output by the filtering unit to reduce the amplitude of the second envelope signal and obtain the target radio frequency induced voltage signal.

4. The device according to any one of claims 1 to 3, characterized in that The device also includes: an analog-to-digital conversion front-end module, a control module, a communication module and a power supply module; The analog-to-digital conversion front-end module is used to perform impedance matching between the radio frequency measurement module and the analog-to-digital conversion interface of the control module, and to filter the target radio frequency induced voltage signal output by the radio frequency measurement module and transmit the filtered target radio frequency induced voltage signal to the analog-to-digital conversion interface of the control module; The control module is used to collect the target radio frequency induced voltage signal input by the analog-to-digital conversion front-end module to the analog-to-digital conversion interface at a specified frequency, and convert the collected target radio frequency induced voltage signal into a digital signal; The communication module is used to send the digital signal of the target radio frequency induced voltage signal converted by the control module to a host computer outside the magnetic resonance environment; The power supply module is used to supply power to the radio frequency measurement module, the analog-to-digital conversion front-end module, the control module and the communication module.

5. The device according to claim 4, characterized in that The device further comprises an electromagnetic shielding box, in which the radio frequency measurement module, the analog-to-digital conversion front-end module, the control module, the communication module and the power supply module in the device are encapsulated; The radio frequency measurement module is packaged in an electromagnetic shielding box, and the packaged radio frequency measurement module is installed in the electromagnetic shielding box in a plug-in connection manner; The device comprises a plurality of packaged radio frequency measurement modules, and different packaged radio frequency measurement modules match the frequencies of different radio frequency magnetic fields. The radio frequency induced voltage generated on the medical device in radio frequency magnetic fields of different frequencies is measured by installing different packaged radio frequency measurement modules in the device; Wherein, the materials of the electromagnetic shielding box and the electromagnetic shielding box include: electromagnetic shielding materials generated by sequentially plating aluminum oxide and / or a conductive film on an aluminum alloy.

6. The device according to claim 4, characterized in that The communication module includes a wireless communication module or a wired communication module; the wireless communication module includes a Bluetooth module; the wired communication module includes a first optical fiber communication module; Wherein, in the case where the communication module adopts the first optical fiber communication module, the device further comprises: a second optical fiber communication module and a serial port communication module; Wherein, the second optical fiber communication module and the serial port communication module are outside the magnetic resonance environment; the first optical fiber communication module is used to convert the digital signal into an optical fiber signal and transmit it to the second optical fiber communication module through an optical fiber, and the second optical fiber communication module is used to convert the received optical fiber signal back into a digital signal and transmit it to the serial port communication module; The serial communication module is used to convert the received digital signal into a serial signal, and transmit the serial signal to the host computer through a universal serial bus.

7. The device according to claim 1, characterized in that The signal acquisition module comprises: Non-magnetic RF probes, RF connecting wires and metal sheets; Wherein, the non-magnetic radio frequency probe is used to collect the original radio frequency induced voltage signal, and the non-magnetic radio frequency probe is connected to the position where the radio frequency induced voltage flows into the medical device; The RF connection line is used to transmit the original RF induced voltage signal collected by the non-magnetic RF probe to the RF measurement module and is connected to the ground terminal of the device; The metal sheet is used to be attached to the housing of the medical device and connected to the ground terminal of the device through the radio frequency connection line.

8. The device according to claim 7, characterized in that The RF connecting line includes a RF core, a ground shielding layer and a protective layer from the inside to the outside, the RF core is used to transmit the original RF induced voltage signal collected by the non-magnetic RF probe to the RF measurement module, the ground shielding layer is used to shield the magnetic resonance environment and is connected to the ground terminal of the device, and the protective layer is used to protect the ground shielding layer and the RF core; The metal sheet is connected to the ground shielding layer through an extended wire.

9. The device according to claim 7, characterized in that The radio frequency connecting line includes a first connecting wire and a second connecting wire; wherein the non-magnetic radio frequency probe is connected to the radio frequency measurement module through the first connecting wire; and the metal sheet is connected to the ground terminal of the device through the second connecting wire.

10. The device according to claim 4, characterized in that The device further includes: a host computer; the host computer is used to receive the digital signal sent by the communication module, and perform at least one operation of display, storage and human-computer interaction based on the received digital signal.

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