阅读说明：本技术 状态检测装置及方法、收发状态控制系统及方法 (state detection device and method, and transceiving state control system and method ) 是由 张启东 孙容 史建华 于 2019-09-04 设计创作，主要内容包括：本发明公开了状态检测装置及方法、收发状态控制系统及方法。其中,状态检测装置应用于磁共振成像磁共振设备；磁共振设备还包括：射频线圈和收/发开关；线圈单元和开关电路均设有开关组件；状态检测装置包括：采样单元,用于获取待测线圈单元的开关组件和/或与待测线圈单元连接的开关电路的开关组件的状态采样数据；判断单元,用于根据状态采样数据以及待测线圈单元的收/发状态确定待测线圈单元和/或开关电路的状态信息。本发明实现了对射频线圈的工作状态的检测,从而可根据检测结果正确地设置射频线圈的工作状态,避免了因射频线圈的工作状态设置错误导致的元件被损毁的现象,及MRI图像信噪比下降的现象。(the invention discloses a state detection device and method, and a transceiving state control system and method. Wherein the state detection device is applied to a magnetic resonance imaging magnetic resonance device; the magnetic resonance apparatus further includes: a radio frequency coil and a transmit/receive switch; the coil unit and the switch circuit are provided with switch components; the state detection device includes: the sampling unit is used for acquiring state sampling data of a switch component of the coil unit to be tested and/or a switch component of a switch circuit connected with the coil unit to be tested; and the judging unit is used for determining the state information of the coil unit to be detected and/or the switch circuit according to the state sampling data and the receiving/transmitting state of the coil unit to be detected. The invention realizes the detection of the working state of the radio frequency coil, thereby correctly setting the working state of the radio frequency coil according to the detection result, and avoiding the phenomenon that elements are damaged and the phenomenon that the signal-to-noise ratio of an MRI image is reduced due to the wrong setting of the working state of the radio frequency coil.)

1. A state detection apparatus is characterized in that the state detection apparatus is applied to a magnetic resonance imaging magnetic resonance device; the magnetic resonance apparatus further includes: a radio frequency coil and a transmit/receive switch; one coil unit of the radio frequency coil is correspondingly connected with one switch circuit of the receiving/transmitting switch, and the switch circuit is used for controlling the receiving/transmitting state of the corresponding coil unit; the coil unit and the switch circuit are provided with switch components;

the state detection device includes:

the sampling unit is used for acquiring state sampling data of a switch component of a coil unit to be tested and/or a switch component of a switch circuit connected with the coil unit to be tested;

and the judging unit is used for determining the state information of the coil unit to be detected and/or the switch circuit according to the state sampling data and the receiving/transmitting state of the coil unit to be detected.

2. the status detection apparatus according to claim 1, wherein the determination unit is specifically configured to:

Determining the on-off state of the switch assembly according to the state sampling data and a mapping relation between a predefined numerical range and the on-off state;

and determining the state information of the coil unit to be tested and/or the switch circuit according to the receiving/transmitting state and the on-off state of the coil unit to be tested.

3. the status detection apparatus according to claim 2, wherein the on-off state includes at least: a first on state, a second on state, a first off state, and a second off state;

the state information includes at least the following state types: normal state, fault state;

The state detection device further includes:

the execution unit is used for executing corresponding processing operation under the condition that the state information is in a fault state;

The processing operations include at least:

when the switch assembly is in a second conducting state or a first off state or a second off state, switching the on-off state of the switch assembly to the first conducting state;

or, when the switch assembly is in a first on state, a second on state or a first off state, switching the on-off state of the switch assembly to the second off state;

Or sending the state information to an external device connected with the execution unit.

4. The status detection apparatus of claim 3, wherein the external device comprises a spectrometer;

The magnetic resonance apparatus further includes: a radio frequency amplifier;

and in response to the state information sent by the execution unit, the spectrometer controls the radio frequency amplifier to stop outputting radio frequency signals to the coil unit.

5. the state detection device of claim 1, wherein the sampling unit comprises:

The load assembly is connected with the switch assembly and is used for converting the output current of the switch assembly into voltage;

The amplifying assembly is connected to two ends of the load assembly and used for amplifying the voltage;

And the analog-to-digital conversion component is connected with the output end of the amplifying component and is used for converting the amplified voltage into state sampling data.

6. a transmit-receive state control system is characterized in that the transmit-receive state control system is applied to a magnetic resonance device; the magnetic resonance apparatus further includes: a spectrometer;

The transmission/reception state control system includes: a switching device and a state detection device according to any one of claims 1-5;

The switching device is used for switching the receiving/transmitting state of a target coil unit in the radio frequency coil according to the radio frequency gate control signal under the condition of receiving the radio frequency gate control signal output by the spectrometer;

After the state of the target coil unit is switched, the state detection device is used for determining the state information of the target coil unit and/or the switch circuit.

7. the transmission/reception state control system according to claim 6, wherein the switching means includes: a resonance/detuning controller and a voltage control circuit;

The voltage control circuit is respectively connected with the resonance/detuning controller and the switch component;

under the condition that the radio frequency gating signal is at a high level, the resonance/detuning controller controls the voltage control circuit to output a positive power supply to the switch component;

Under the condition that the radio frequency gating signal is at a low level, the resonance/detuning controller controls the voltage control circuit to output a negative power supply to the switch component.

8. a state detection method is characterized in that the state detection method is applied to a magnetic resonance imaging magnetic resonance device; the magnetic resonance apparatus further includes: a radio frequency coil and a transmit/receive switch; one coil unit of the radio frequency coil is correspondingly connected with one switch circuit of the receiving/transmitting switch, and the switch circuit is used for controlling the receiving/transmitting state of the corresponding coil unit; the coil unit and the switch circuit are provided with switch components;

The state detection method comprises the following steps:

Acquiring state sampling data of a switch component of a coil unit to be tested and/or a switch component of a switch circuit connected with the coil unit to be tested;

And determining the state information of the coil unit to be tested and/or the switch circuit according to the state sampling data and the receiving/transmitting state of the coil unit to be tested.

9. The method of claim 8, wherein determining the state information of the coil unit under test and/or the switch circuit according to the state sampling data and the transmission/reception state of the coil unit under test comprises:

Determining the on-off state of the switch assembly according to the state sampling data and a mapping relation between a predefined numerical range and the on-off state;

and determining the state information of the coil unit to be tested and/or the switch circuit according to the receiving/transmitting state and the on-off state of the coil unit to be tested.

10. the state detection method of claim 9, wherein the on-off state comprises at least: a first on state, a second on state, a first off state, and a second off state;

the state information includes at least the following state types: normal state, fault state;

The state detection method further includes:

Executing corresponding processing operation under the condition that the state information is in a fault state;

The processing operations include at least:

When the switch assembly is in a second conducting state or a first off state or a second off state, switching the on-off state of the switch assembly to the first conducting state;

Or, when the switch assembly is in a first on state, a second on state or a first off state, switching the on-off state of the switch assembly to the second off state;

Or, the state information is sent to the external equipment.

11. the status detection method of claim 10, wherein the external device comprises a spectrometer;

The magnetic resonance apparatus further includes: a radio frequency amplifier;

The state detection method further includes:

in response to the transmitted status information, the spectrometer controls the radio frequency amplifier to stop outputting radio frequency signals to the coil unit.

12. The condition sensing method as recited in claim 9, wherein obtaining the condition sample data of the switching assembly comprises:

Acquiring a voltage of a load component connected with the switch component;

Amplifying the voltage;

And converting the amplified voltage into the state sampling data.

13. a transmit-receive state control method is characterized in that the transmit-receive state control method is applied to a magnetic resonance device; the magnetic resonance apparatus further includes: a spectrometer;

the transceiving state control method comprises the following steps:

Under the condition of receiving a radio frequency gate control signal output by a spectrometer, switching the receiving/transmitting state of a target coil unit in a radio frequency coil according to the radio frequency gate control signal;

Determining state information of the target coil unit and/or the switching circuit after switching of the state of the target coil unit using the state detection method of any one of claims 8-12.

Technical Field

the invention relates to the technical field of medical imaging, in particular to a state detection device and method and a transceiving state control system and method.

background

Magnetic Resonance Imaging (MRI) is one of the main Imaging modalities in modern medical Imaging. The MRI system mainly comprises a magnet system, a gradient system, a radio frequency system, a scanning computer and the like. Wherein, the radio frequency system includes: the radio frequency coil, a receiving and transmitting state controller for controlling the receiving and transmitting state of the radio frequency coil and a T/R switch (receiving/transmitting switch).

the receiving and transmitting state controller ensures that diode assemblies or PIN tubes of the radio frequency transmitting coil, the T/R switch and the radio frequency receiving coil are correctly turned off and turned on under the conditions of a transmitting state and a receiving state according to different working modes of clinical scanning, system calibration and fault diagnosis, and accurate control of tuning and detuning of the radio frequency transmitting coil and the radio frequency receiving coil is achieved.

If the diode components built in the radio frequency coil and the T/R switch cannot be properly set to be turned off and on according to the change of the radio frequency transmission and reception states in the various scanning modes, there occurs a phenomenon in which the diode components built in the radio frequency coil or the T/R switch are damaged due to the high-power radio frequency energy output from the radio frequency amplifier, or a phenomenon in which the signal-to-noise ratio of the MRI image is lowered due to the fact that the diode components built in the radio frequency coil or the T/R switch are not sufficiently set to be turned off and on.

Disclosure of Invention

The invention provides a state detection device and method, a receiving and sending state control system and method, which are used for realizing state detection after the working state of a radio frequency coil is switched, further ensuring the safety of the radio frequency coil and a T/R switch in a radio frequency transmitting state, and obtaining a magnetic resonance signal with a normal signal-to-noise ratio by the radio frequency coil in a receiving state.

specifically, the invention is realized by the following technical scheme:

In a first aspect, a state detection apparatus is provided, which is applied to a magnetic resonance imaging magnetic resonance device; the magnetic resonance apparatus further includes: a radio frequency coil and a transmit/receive switch; one coil unit of the radio frequency coil is correspondingly connected with one switch circuit of the receiving/transmitting switch, and the switch circuit is used for controlling the receiving/transmitting state of the corresponding coil unit; the coil unit and the switch circuit are provided with switch components;

the state detection device includes:

the sampling unit is used for acquiring state sampling data of a switch component of a coil unit to be tested and/or a switch component of a switch circuit connected with the coil unit to be tested;

and the judging unit is used for determining the state information of the coil unit to be detected and/or the switch circuit according to the state sampling data and the receiving/transmitting state of the coil unit to be detected.

In a second aspect, a transmit-receive state control system is provided, which is applied to a magnetic resonance device; the magnetic resonance apparatus further includes: a spectrometer;

the transmission/reception state control system includes: switching means and state detecting means as described in the first aspect;

The switching device is used for switching the receiving/transmitting state of a target coil unit in the radio frequency coil according to the radio frequency gate control signal under the condition of receiving the radio frequency gate control signal output by the spectrometer;

After the state of the target coil unit is switched, the state detection device is used for determining the state information of the target coil unit and/or the switch circuit.

In a third aspect, a state detection method is provided, which is applied to a magnetic resonance imaging magnetic resonance apparatus; the magnetic resonance apparatus further includes: a radio frequency coil and a transmit/receive switch; one coil unit of the radio frequency coil is correspondingly connected with one switch circuit of the receiving/transmitting switch, and the switch circuit is used for controlling the receiving/transmitting state of the corresponding coil unit; the coil unit and the switch circuit are provided with switch components;

the state detection method comprises the following steps:

Acquiring state sampling data of a switch component of a coil unit to be tested and/or a switch component of a switch circuit connected with the coil unit to be tested;

And determining the state information of the coil unit to be tested and/or the switch circuit according to the state sampling data and the receiving/transmitting state of the coil unit to be tested.

in a fourth aspect, a transmit/receive state control method is provided, which is applied to a magnetic resonance apparatus; the magnetic resonance apparatus further includes: a spectrometer;

the transceiving state control method comprises the following steps:

Under the condition of receiving a radio frequency gate control signal output by a spectrometer, switching the receiving/transmitting state of a target coil unit in a radio frequency coil according to the radio frequency gate control signal;

After the state of the target coil unit is switched, determining the state information of the target coil unit and/or the switch circuit by using the state detection method of the third aspect.

the technical scheme provided by the embodiment of the invention can have the following beneficial effects: the detection of the working state of the radio frequency coil is realized, so that the working state of the radio frequency coil can be correctly set according to the detection result, and the phenomena that elements are damaged due to the setting error of the working state of the radio frequency coil and the signal-to-noise ratio of an MRI image is reduced are avoided.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

fig. 1 is a schematic diagram of a radio frequency system according to an exemplary embodiment of the present invention;

Fig. 2A is a schematic structural diagram of a transmission/reception state control system according to an exemplary embodiment of the present invention;

Fig. 2B is a schematic structural diagram of a transceiving state control system according to another exemplary embodiment of the present invention, wherein the receiving module and the generating module are not shown;

Fig. 2C is a schematic structural diagram of a transceiving state control system according to another exemplary embodiment shown in an exemplary embodiment of the present invention, wherein the receiving module and the generating module are not shown;

Fig. 2D is a schematic structural diagram of a transceiving state control system according to another exemplary embodiment shown in an exemplary embodiment of the present invention, wherein the receiving module and the generating module are not shown;

FIG. 2E is another schematic diagram of the state detection device of FIG. 2A according to an exemplary embodiment of the present invention;

FIG. 3A is a flow chart illustrating a method of condition detection in accordance with an exemplary embodiment of the present invention;

FIG. 3B is a flow chart illustrating another method of condition detection in accordance with an exemplary embodiment of the present invention;

Fig. 4A is a flowchart illustrating a transceiving state control method according to an exemplary embodiment of the present invention;

fig. 4B is a flowchart illustrating another transceiving state control method according to an exemplary embodiment of the present invention;

Fig. 4C is a flowchart illustrating another transceiving state control method according to an exemplary embodiment of the present invention.

Detailed Description

reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

the magnetic resonance device comprises a magnet system, a gradient system and a radio frequency system. Fig. 1 is a schematic structural diagram of a radio frequency system according to an exemplary embodiment of the present invention, where the radio frequency system includes a radio frequency transmitting subsystem and a signal receiving subsystem. The radio frequency transmission subsystem comprises a radio frequency signal generation module 11, a radio frequency amplifier 12 and a radio frequency transmission coil 13. The radio frequency signal generating module 11 generates a radio frequency excitation signal; the radio frequency amplifier 12 is configured to amplify the radio frequency excitation signal and output a high-power radio frequency pulse current to the radio frequency transmitting coil 13, so that the radio frequency transmitting coil 13 generates a uniform radio frequency field for exciting a magnetic resonance phenomenon.

The signal receiving subsystem comprises a radio frequency receive coil 14 and a signal processor 15. The radio frequency receiving coil 14 is used for receiving free induction attenuation signals or echo signals generated by the resonance of a tested body; the signal processor 15 is used for analyzing and processing the echo signal.

the radio frequency coil is generally composed of a plurality of coil units, each of which can independently induce self-induced attenuation signals or echo signals, and is used for forming medical images with uniform brightness through image reconstruction and combination. The radio frequency coil can be divided into a radio frequency transmitting coil and a radio frequency receiving coil according to functions. In practical application, different coils can be used to realize the functions of radio frequency transmission or radio frequency reception respectively, and the functions of radio frequency transmission and radio frequency reception can also be realized by a common coil. Wherein, the coil unit is provided with a switch assembly inside. The switching assembly may comprise a single diode or a plurality of diodes connected in parallel. The diode may be a normal diode or a PIN tube (diode with an intrinsic layer).

During scanning imaging, it is necessary to switch the operating state of the coil unit, i.e. to switch the coil unit between a transmit state and a receive state. The magnetic resonance apparatus is further provided with a transmit/receive state control system (not shown) and a T/R switch 16. The T/R switch 16 includes a multi-way switch circuit, and one way switch circuit is connected to one coil unit. The switch circuit is internally provided with a switch assembly. Like the coil unit, the switching component of the switching circuit may comprise a single diode or a plurality of diodes connected in parallel. The diode can be a common diode or a PIN tube.

During scanning imaging, the transmitting state and the receiving state of the coil unit are determined by the high and low levels of the radio frequency gating signal RF _ Gate output by the spectrometer.

When the RF _ Gate is at a low level, the coil unit in the FOV (field angle) of the scanning field needs to be set to a transmitting state, and the T/R switch 16 controls the corresponding coil unit to be connected to the radio frequency amplifier 12, specifically, the coil unit in the FOV is connected to the radio frequency amplifier 12 through the corresponding switch circuit to form a transmitting loop, so as to feed the high-power output power energy of the radio frequency amplifier 12 into the corresponding coil unit, and simultaneously, the receiving loop is cut off, thereby protecting the radio frequency preamplifier in the receiving loop;

When the RF _ Gate is at a high level, the coil unit in the FOV of the scanning field needs to be set to a receiving state, and the T/R switch 16 controls the corresponding coil unit to be connected to the signal processor 15 to form a receiving loop, and simultaneously cuts off the transmitting loop to receive the magnetic resonance signal.

In the transmission/reception state setting of the coil unit, it is necessary to switch the switch module built in the coil unit and the switch module built in the switch circuit connected to the coil unit.

taking the implementation of the rf transmitting and receiving functions by using the common coil as an example, the on/off states of the coil unit and the switch component of the switch circuit connected to the coil unit are described below when the coil unit is in the transmitting/receiving state:

When the coil unit is in a transmitting state, the switch component of the coil unit is in a conducting state, and the switch component of the switch circuit connected with the coil unit is also in a conducting state, so that high-power output energy of the radio frequency amplifier can be fed into the coil unit, and a receiving loop is cut off; the coil unit forms a closed resonant loop to generate a B1 radio frequency field with a required frequency under the action of high-power closed current output by the radio frequency amplifier.

When the coil unit is in a receiving state, the switch component of the coil unit is in a conducting state, and the switch component of the switch circuit connected with the coil unit is in a switching-off state so as to cut off the transmitting loop and connect the coil unit into the receiving loop; the radio frequency coil itself forms a closed resonant circuit that receives the magnetic resonance signals.

during the non-scanning period, all the coil units and the switch components of the T/R switch can be set to be in an off state, so that the energy-saving effect is achieved.

Fig. 2A is a schematic structural diagram of a transmission/reception state control system according to an exemplary embodiment of the present invention, which is suitable for not only an MRI apparatus but also an NMR (nuclear magnetic resonance) apparatus, and which is capable of controlling switching between a transmission state and a reception state of a coil unit and detecting whether or not an operating state of the coil unit is correctly switched. In principle, one transceiving state control system is connected with one switching circuit of one coil unit or one T/R switch to realize switching and detection of the on-off state of a built-in switching component of one coil unit or one switching circuit, and the state switching and detection of a plurality of coil units and switching circuits can be realized by arranging a plurality of transceiving state control systems, and fault positioning is realized.

The operation principle of the transmission/reception state control system according to the embodiment of the present invention will be described below by switching the transmission/reception state of one coil unit.

as shown in fig. 2A, the transmission/reception state control system includes: a switching module 21, a state detection device 22 and a signal generation module 23. The state detection device 22 is connected to the switching module 21 and the signal generation module 23, respectively.

The switching module 21 is configured to switch the receiving/transmitting state of the target coil unit in the radio frequency coil according to the radio frequency gate control signal when receiving the radio frequency gate control signal output by the spectrometer. For the transmit/receive state setting of one coil unit, the on/off state of the switch assembly built in the coil unit and the switch assembly built in the switch circuit connected to the coil unit need to be switched, so that the transmit/receive state control system of the embodiment of the present invention needs to be arranged for the coil unit and the corresponding switch circuit respectively.

After the state of the target coil unit is switched, the state detection device 22 corresponding to the transmit-receive state control system is invoked to determine the state information of the target coil unit and/or the switching circuit. The state information characterizes whether the on-off state of the switch assembly is properly switched.

The signal generating module 23 may generate a state detection signal according to the state information, so as to allow operation and maintenance personnel to perform fault location. Wherein, the state detection signal is used for representing whether the working state of the target coil unit is correctly switched. It should be noted that the signal generating module 23 may be configured according to actual requirements, and is not a necessary element.

in one example, the signal generating module 23 may send the generated state detection signal to an upper computer, so that the upper computer generates a corresponding control instruction according to the state detection signal and sends the control instruction to a corresponding transceiving state control system. That is, if the on-off state of the switch assembly built in the coil unit or the switch circuit is different from the expected state after the state switching, the transceiving state control system can call the switching module according to the control instruction sent by the upper computer to switch the working state of the target coil unit again and switch the target coil unit to the expected state.

in another example, the signal generating module 23 further sends the state detection signal to the spectrometer, so that the spectrometer controls the rf amplifier to stop outputting the rf signal to the target coil unit, so as to protect the components.

on the basis of the transmission/reception state control system shown in fig. 2A, fig. 2B shows a schematic structural diagram of a transmission/reception state control system according to another exemplary embodiment of the present invention. Referring to fig. 2B, the switching module 21 includes a T/D controller (resonance/detuning controller) 211 and a voltage control circuit 212, and the T/D controller 211 is connected with the switching component 25 of the coil unit or the switching circuit through the voltage control circuit 212.

Under the condition that the radio frequency gating signal is at a high level, the T/D controller 211 controls the voltage control circuit 212 to output a positive power supply to the switch component; in the case that the rf gating signal is low, the T/D controller 211 controls the voltage control circuit 212 to output a negative power to the switch element.

Referring to fig. 2C, a possible implementation of the voltage control circuit is shown, the voltage control circuit comprising: a first level shifter, a second level shifter, an NMOS, a PMOS, a positive supply V + and a negative supply V-. The first control output end of the T/D controller is connected with the grid electrode of the NMOS through a first level shifter, the drain electrode of the NMOS is connected with a negative power supply V-, the source electrode of the NMOS is connected with the drain electrode of the PMOS, the source electrode of the PMOS is connected with a positive power supply V +, and the grid electrode of the PMOS is connected with the second control output end of the T/D controller through a second level shifter. The source of the NMOS and the drain of the PMOS are connected to the switching element (cathode of the diode).

in one example, the first level shifter and the second level shifter may be, but are not limited to, employing an optical coupler type level shifter.

in another example, a triode may be used instead of NMOS and PMOS, and the specific implementation process is not repeated here.

Referring to fig. 2B, the state detection device 22 includes a sampling unit 221 and a judgment unit 222. The sampling unit 221 is connected to the judging unit 222 and the switching element.

The sampling unit 221 is configured to obtain state sampling data of the switching element of the target coil unit and/or the switching element of the switching circuit connected to the target coil unit.

the judging unit 222 is configured to determine the state information of the target coil unit and/or the switching circuit according to the state sampling data and the expected transmission/reception state of the target coil unit.

specifically, the determining unit is specifically configured to:

Determining the on-off state of the switch assembly according to the state sampling data and the mapping relation between the predefined numerical range and the on-off state;

And determining the state information of the target coil unit and/or the switch circuit according to the receiving/transmitting state and the on-off state of the target coil unit.

The predefined value range is determined according to the resistance value of the load component and the conduction characteristic of the switch component. The on-off state includes at least: a first on state, a second on state, a first off state, and a second off state; the on-off state is, for example, a normal on state, a semi-off state, a normal off state. The corresponding state information includes at least the following state types: normal state, fault state.

Referring to the on/off state of the coil unit and the switch component of the switch circuit in the transmitting/receiving state of the coil unit, for example, if the coil unit is in the transmitting state, the expected state of the switch component of the coil unit is in the conducting state, and if the state is switched, the current state of the switch component is in the normal conducting state, which indicates that the switch component is correctly switched, the state information is in the normal state; and if the current state of the switch assembly is a semi-conducting state, a semi-off state or a normal off state after the state is switched, the current state indicates that the switch assembly is not switched correctly, and the state information is a fault state. Furthermore, according to actual requirements, fault states can be divided into a general alarm state and a serious alarm state according to specific numerical values of state sampling data.

in one example, the determining unit 222 may implement a corresponding function through a multi-threshold decider.

In the embodiment, the detection of the working state of the radio frequency coil is realized, the short circuit, the open circuit and other fault states of various radio frequency coils can be judged in all directions by setting a plurality of preset ranges, and the position of a fault occurrence point can be accurately positioned, so that when the radio frequency coil has the fault state, the magnetic resonance equipment can be controlled to stop scanning, turn off the radio frequency amplifier or output a warning state according to the fault states with different severity degrees, and the safety of each element of the radio frequency subsystem is protected.

referring to fig. 2C, which shows one possible implementation of the sampling unit, the sampling unit 221 includes a load component R, an amplifying component and an analog-to-digital conversion component. The load component R is connected to the switching component 25 for converting the output current of said switching component into a voltage. The amplifying assembly is connected to two ends of the load assembly and used for amplifying voltage; the analog-to-digital conversion component is connected with the output end of the amplifying component and used for converting the amplified voltage into state sampling data.

The load component may include one resistor, or may include a plurality of resistors connected in series or in parallel, and the resistance value of the resistor; the number and the resistance value of the resistors can be set according to actual requirements.

The amplifying component may be implemented by an operational amplifier a. Two input ends of the operational amplifier A are connected with two ends of the load component; the output terminal of the operational amplifier a is connected to the input terminal of the a/D conversion module, and the output terminal of the a/D conversion module is connected to the judgment unit 222.

It should be noted that, although in principle, one state detection device realizes detection of a switching element of one coil unit or one switching circuit, the a/D conversion element of this embodiment may adopt a multi-channel a/D converter, see fig. 2D, and detection of multiple switching elements may be realized by providing multiple load elements and operational amplifiers, for example, m +1 a/D converters with n channels, and acquisition of on-off states of (m +1) × n diodes may be realized.

Fig. 2B is a schematic structural diagram of a state detection device, and fig. 2E is a schematic structural diagram of a state detection device according to another exemplary embodiment of the present invention. Referring to fig. 2E, the state detection apparatus further includes: the execution unit 223.

the execution unit 223 is used for executing corresponding processing operation in case that the status information is in a failure status.

In one example, the processing operation includes: when the switch assembly is in a second conduction state or a first off state or a second off state, switching the on-off state of the switch assembly to the first conduction state; or, when the switch assembly is in the first on state, the second on state or the first off state, the on-off state of the switch assembly is switched to the second off state.

In this embodiment, if the state information is a fault state, it indicates that the current on-off state of the switch assembly is different from the expected state, and the state detection device can automatically switch the on-off state of the switch assembly again without passing through an upper computer.

That is, if the state information is a fault state, it indicates that the state after the switching of the switch assembly is not an expected state if the state after the switching of the switch assembly is a second on state, a first off state or a second off state, and the expected state of the switch assembly is a first on state, and the on-off state of the switch assembly needs to be switched to the first on state again;

If the state information is a fault state, it indicates that the state after the switching of the switch assembly is not an expected state if the state is a first on state, a second on state or a first off state, and the expected state of the switch assembly is a second off state, and the on-off state of the switch assembly needs to be switched to the second off state again.

It should be noted that the number of times of the on-off state re-switching of the switch assembly may be one time or two times, and if the number of times of the re-switching reaches the threshold value, the callable signal generating module 23 may generate the fault signal.

In another example, the processing operation includes: and sending the state information to the external equipment connected with the execution unit.

the external equipment comprises a spectrometer, and the spectrometer controls the radio frequency amplifier to stop outputting radio frequency signals to the coil unit in response to the state information sent by the execution unit so as to further protect the components.

or, taking the implementation of the rf transmitting and receiving functions by using the common coil as an example, the following further explains the working principle of the transmitting and receiving state control system:

When the magnetic resonance equipment is in a scanning period, and a spectrometer sends a low-level radio frequency gate control signal to a receiving and sending state control system, a T/D controller of the receiving and sending state control system connected with the coil unit and the switch circuit outputs a high-level signal, so that the first level converter and the second level converter output V + voltage to drive the NMOS tube to be conducted and the PMOS tube to be turned off, and a negative power supply V-is applied to a switch component of the coil unit and a cathode of the switch component of the switch circuit connected with the coil unit to enable the corresponding switch component to be in a conducting state.

after the working state is switched, the switching module calls the state detection device to detect whether the correct switching of the working state is completed, and it is assumed that the emission state multi-threshold decision criterion is shown in table 1.

TABLE 1

Voltage U of load assembly	Diode assembly state	Performing an action
			0V＜U≤3.1V	switch off	Generating fault diagnosis signal and stopping scanning
3.1＜U≤3.2V	Half turn-off	generating alarm prompt signal
			3.2＜U≤3.3V	semi-conducting	Generating alarm prompt signal
3.3＜U≤3.5V	Conduction of	generating a normal switching signal

If the voltages of the load components read by the a/D converters of the two coil state detection devices fall within (3.3V, 3.5V), it indicates that the diode components of the coil unit and the switching circuit to be detected are in a normal conduction state, the working states of the coil unit are correctly switched, allowing the rf amplifier to output a high-power rf signal to the coil unit, which generates an rf field to excite a magnetic resonance phenomenon, and the signal generation module 23 can generate a normal switching signal (state detection signal).

if the voltage of the load component read by the A/D converter of one coil state detection device falls within (3.2V, 3.3V), the diode component connected with the coil state detection device is in a semi-conducting state, at the moment, a radio frequency amplifier is allowed to output a high-power radio frequency signal, a drive coil unit generates a radio frequency field, but the radio frequency energy is reduced more frequently, the radio frequency flip angle cannot reach an expected angle, and an excited magnetic resonance signal is weaker, so the signal noise is lower;

If the voltage of the load component read by the A/D converter of one of the coil state detection devices falls within (3.1V, 3.2V), the diode component connected with the coil state detection device is in an almost off state, although the radio frequency amplifier is allowed to output a high-power radio frequency signal, the drive coil unit generates a radio frequency field, but because the radio frequency energy is lower than a normal value, the radio frequency flip angle cannot reach an expected angle, and the excited magnetic resonance signal is weaker, the signal noise is lower;

If the voltage of the load component read by the a/D converter of one of the coil state detection devices falls within (0, 3.1V), it indicates that the diode component connected to the coil state detection device is in an off state and the operating state is not correctly switched, and the signal generation module 23 may generate a fault signal (state detection signal).

During the non-scanning period of the magnetic resonance equipment, the spectrometer sends a high-level radio frequency gate control signal to the receiving and sending state control system, the T/D controllers of the receiving and sending state control system connected with the coil unit and the switch circuit both output low-level signals, so that the first level converter and the second level converter both output V-voltage to drive the NMOS tube to be switched off and the PMOS tube to be switched on, and then a positive power supply V + is applied to the cathode of the switch assembly of the coil unit or the switch assembly of the switch circuit to enable the corresponding switch assembly to be in a switched-off state, so that the working state of the radio frequency coil is set to be a receiving state.

after the receiving and sending states are switched, the switching module calls the state detection device to detect whether the correct switching of the working states is completed or not, except that the multiple threshold judgment criteria are different, the specific detection process is similar to that during the scanning period, and the detailed description is omitted here.

It should be noted that the a/D converter may be, but is not limited to, an AD7829-1 chip, and if chips of other types are used, the upper limit and the lower limit of each preset range need to be adaptively adjusted.

Corresponding to the embodiment of the state detection device, the invention also provides an embodiment of a state detection method.

Fig. 3A is a flowchart illustrating a status detection method according to an exemplary embodiment of the present invention, the method including the steps of:

301, acquiring state sampling data of a switch component of the coil unit to be tested and/or a switch component of a switch circuit connected with the coil unit to be tested.

Wherein the state sampling data represents an on-off state of the switch assembly. Specifically, the voltage of the load component connected to the cathode of the switching component may be acquired as the state sampling data.

And step 302, determining the state information of the coil unit to be tested and/or the switch circuit according to the state sampling data and the receiving/transmitting state of the coil unit to be tested.

On the basis of the flow chart of the state detection method shown in fig. 3A, referring to fig. 3B, step 302 specifically includes:

And step 302-1, determining the on-off state of the switch assembly according to the state sampling data and the mapping relation between the predefined numerical range and the on-off state.

wherein the on-off state comprises at least: a first on state, a second on state, a first off state, and a second off state.

and step 302-2, determining the state information of the coil unit to be tested and/or the switch circuit according to the receiving/transmitting state and the on-off state of the coil unit to be tested.

wherein the state information at least comprises the following state types: normal state, fault state.

And step 302-3, executing corresponding processing operation under the condition that the state information is in the fault state.

wherein the processing operation at least comprises:

when the switch assembly is in a second conduction state or a first off state or a second off state, switching the on-off state of the switch assembly into the first conduction state;

Or, when the switch assembly is in the first on state, the second on state or the first off state, the on-off state of the switch assembly is switched to the second off state;

or sending the state information to the external equipment.

in one example, the external device comprises a spectrometer, and the state detection method further comprises:

In response to the transmitted status information, the spectrometer controls the radio frequency amplifier to stop outputting radio frequency signals to the coil unit.

corresponding to the embodiment of the receiving and sending state control system, the invention also provides an embodiment of a receiving and sending state control method.

fig. 4A is a flowchart illustrating a transceiving state control method according to an exemplary embodiment of the present invention, the method including the steps of:

step 401, under the condition of receiving the radio frequency gate control signal output by the spectrometer, switching the receiving/transmitting state of the target coil unit in the radio frequency coil according to the radio frequency gate control signal.

step 402, after the state of the target coil unit is switched, determining the state information of the target coil unit and/or the switch circuit.

In step 402, the state information of the target coil unit and/or the switching circuit is detected by using the state detection method of the above embodiment.

on the basis of the flowchart of the transceiving state control method shown in fig. 4A, referring to fig. 4B, another possible implementation manner of the transceiving state control method is shown, in this embodiment, the on-off state of the switch assembly can be switched again by an upper computer, and after step 402, the method further includes:

And step 403, switching the working state of the target coil unit again when receiving the control command sent by the upper computer.

and the control command is generated by the upper computer according to the state information.

On the basis of the flowchart of the transceiving state control method shown in fig. 4A, referring to fig. 4C, another possible implementation manner of the transceiving state control method is shown, in this embodiment, after step 402, the method further includes:

step 403', the state information is sent to the spectrometer, so that the spectrometer controls the radio frequency amplifier to stop outputting the radio frequency signal to the target coil unit.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.