Body coil imbalance detection system and method

Abstract

The application provides a body coil unbalance degree detection system and method, which comprises a bridge body coil and a receiving device; the bridge is used for transmitting a first excitation signal and a second excitation signal to the body coil, so that the body coil forms a magnetic field and generates a first echo signal and a second echo signal, and transmits the first echo signal and the second echo signal to the receiving device; the receiving device is used for determining the amplitude unbalance degree and the phase unbalance degree of the two echo signals of the body coil according to the first echo signal and the second echo signal; the amplitude unbalance degree and the phase unbalance degree of the two echo signals of the body coil are determined according to the first echo signal and the second echo signal through the receiving device, so that the double-channel coupler in the conventional nuclear magnetic resonance system can be omitted, the layout space is saved, the nuclear magnetic resonance system circuit is simplified, the overall volume of the nuclear magnetic resonance system is reduced, and the device cost of the nuclear magnetic resonance system is reduced.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, and in particular to a body coil imbalance detection system and method. Background Art

[0002] During the implementation of nuclear magnetic resonance, it is necessary to ensure that the amplitude and phase of the two signals of the body coil are balanced so that accurate measurement of human or animal tissue information can be achieved through the nuclear magnetic resonance echo signal.

[0003] Currently, nuclear magnetic resonance systems generally design a two-way coupler in the bridge. The two-way coupler monitors the forward power and reflected power to calculate the reflection coefficient of the two signals of the body coil, thereby calculating the imbalance of the amplitude and phase of the two signals of the body coil, and then determining whether the body coil is abnormal.

[0004] However, due to the large size of the dual-path coupler, it takes up a lot of layout space, making the nuclear magnetic resonance system large in size, complex in circuit structure and high in cost. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a body coil imbalance detection system and method to solve the problems of large size, complex circuit structure and high cost of the current nuclear magnetic resonance system that monitors the dual-path imbalance of the body coil through a dual-path coupler.

[0006] In a first aspect, the present invention provides a body coil imbalance detection system, which includes a bridge body coil and a receiving device; the bridge is used to transmit a first excitation signal and a second excitation signal to the body coil, so that the body coil forms a magnetic field and generates a first echo signal and a second echo signal, and transmits the first echo signal and the second echo signal to the receiving device; the receiving device is used to determine the amplitude imbalance and phase imbalance of the two echo signals of the body coil based on the first echo signal and the second echo signal.

[0007] The body coil imbalance detection system designed above, on the basis of realizing conventional nuclear magnetic resonance functions, transmits both the first echo signal and the second echo signal generated by the body coil to a receiving device via an electrical bridge. The receiving device determines the amplitude imbalance and phase imbalance of the two echo signals of the body coil based on the first echo signal and the second echo signal. Thus, the two-way coupler in the conventional nuclear magnetic resonance system can be omitted, thereby saving layout space, simplifying the nuclear magnetic resonance system circuit, reducing the overall volume of the nuclear magnetic resonance system, and reducing the cost of the nuclear magnetic resonance system components.

[0008] In an optional implementation of the first aspect, the receiving device is specifically used to obtain a first power of the first echo signal and a second power of the second echo signal; and calculate the ratio of the first power to the second power to obtain the amplitude imbalance of the two echo signals of the body coil.

[0009] In an optional implementation of the first aspect, after obtaining the amplitude imbalance of the two echo signals of the body coil, the receiving device is also used to determine whether the calculated amplitude imbalance exceeds a preset amplitude imbalance range; if it is determined that the amplitude imbalance exceeds the preset amplitude imbalance range, an alarm is generated.

[0010] In an optional implementation of the first aspect, the receiving device is further specifically configured to obtain a phase difference between the first echo signal and the second echo signal, and determine a phase imbalance between the two echo signals of the body coil according to the phase difference between the first echo signal and the second echo signal.

[0011] In an optional implementation of the first aspect, the receiving device is further specifically configured to, after obtaining the phase imbalance of the two echo signals of the body coil, determine whether the calculated phase imbalance of the two echo signals of the body coil exceeds a preset phase imbalance range; and generate an alarm if it is determined that the phase imbalance exceeds the preset phase imbalance range.

[0012] In an optional implementation of the first aspect, the bridge is connected to the first end of the body coil through a first line, the bridge is connected to the second end of the body coil through a second line, and the bridge is electrically connected to the receiving device through a third line and a fourth line respectively.

[0013] In an optional implementation of the first aspect, the system further includes a first two-way switch and a second two-way switch; the bridge switches the connection with the first line and the third line through the first two-way switch, and the bridge switches the connection with the second line and the fourth line through the second two-way switch.

[0014] In an optional embodiment of the first aspect, the receiving device includes a receiver, a first preamplifier and a second preamplifier, the bridge is electrically connected to the first preamplifier through a third line, the bridge is electrically connected to the second preamplifier through a fourth line, and the receiver is electrically connected to the first preamplifier and the second preamplifier respectively.

[0015] In a second aspect, the present application provides a body coil imbalance detection method, which is applied to the receiving device described in any optional embodiment of the first aspect, and the method includes: obtaining a first echo signal and a second echo signal returned by the body coil; determining the amplitude imbalance and phase imbalance of the two echo signals of the body coil based on the first echo signal and the second echo signal.

[0016] The body coil imbalance detection method designed above, on the basis of realizing conventional nuclear magnetic resonance functions, transmits both the first echo signal and the second echo signal generated by the body coil to a receiving device via an electrical bridge. The receiving device determines the amplitude imbalance and phase imbalance of the two echo signals of the body coil based on the first echo signal and the second echo signal. As a result, the two-way coupler in the conventional nuclear magnetic resonance system can be omitted, thereby saving layout space, simplifying the nuclear magnetic resonance system circuit, reducing the overall volume of the nuclear magnetic resonance system, and reducing the cost of the nuclear magnetic resonance system components.

[0017] In an optional implementation of the second aspect, determining the amplitude imbalance and phase imbalance of the two echo signals of the body coil based on the first echo signal and the second echo signal includes: obtaining a first power of the first echo signal and obtaining a second power of the second echo signal; calculating a ratio of the first power to the second power to obtain the amplitude imbalance of the two echo signals of the body coil; obtaining a phase difference between the first echo signal and the second echo signal; and determining the phase imbalance of the two echo signals of the body coil based on the phase difference between the first echo signal and the second echo signal.

[0018] In a third aspect, the present application provides a body coil imbalance detection device, which is arranged in the receiving device described in any optional embodiment of the first aspect, and the device includes an acquisition module and a determination module. The acquisition module is used to obtain a first echo signal and a second echo signal returned by the body coil; the determination module is used to determine the amplitude imbalance and phase imbalance of the two echo signals of the body coil based on the first echo signal and the second echo signal.

[0019] The body coil imbalance detection device of the above design, on the basis of realizing the conventional nuclear magnetic resonance function, transmits both the first echo signal and the second echo signal generated by the body coil to a receiving device via an electrical bridge. The receiving device determines the amplitude imbalance and phase imbalance of the two echo signals of the body coil based on the first echo signal and the second echo signal. As a result, the two-way coupler in the conventional nuclear magnetic resonance system can be omitted, thereby saving layout space, simplifying the nuclear magnetic resonance system circuit, reducing the overall volume of the nuclear magnetic resonance system, and reducing the cost of the nuclear magnetic resonance system components.

[0020] In an optional implementation of the third aspect, the determination module is specifically used to obtain a first power of the first echo signal and a second power of the second echo signal; calculate the ratio of the first power to the second power to obtain the amplitude imbalance of the two echo signals of the body coil; obtain the phase difference between the first echo signal and the second echo signal; and determine the phase imbalance of the two echo signals of the body coil based on the phase difference between the first echo signal and the second echo signal.

[0021] In a fourth aspect, the present application provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it executes the method in the second aspect and any optional implementation of the second aspect.

[0022] In a fifth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method in the second aspect and any optional implementation of the second aspect is executed.

[0023] In a sixth aspect, the present application provides a computer program product, which, when running on a computer, enables the computer to execute the method in the second aspect or any optional implementation of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A first structural diagram of a body coil imbalance detection system provided in an embodiment of the present application;

[0026] Figure 2 A second structural diagram of the body coil imbalance detection system provided in an embodiment of the present application;

[0027] Figure 3 A third structural diagram of the body coil imbalance detection system provided in an embodiment of the present application;

[0028] Figure 4 A fourth structural diagram of the body coil imbalance detection system provided in an embodiment of the present application;

[0029] Figure 5 A flow chart of a method for detecting body coil imbalance according to an embodiment of the present application;

[0030] Figure 6 A schematic structural diagram of a body coil imbalance detection device provided in an embodiment of the present application;

[0031] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0032] Icons: 10-bridge; 20-body coil; 30-receiving device; 301-receiver; 302-first preamplifier; 303-second preamplifier; I1-first circuit; Q1-second circuit; I2-third circuit; Q2-fourth circuit; K1-first two-way switch; K2-second two-way switch; 600-acquisition module; 610-determination module; 7-electronic device; 701-processor; 702-memory; 703-communication bus. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0035] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0036] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0038] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0039] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0040] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0041] This application provides a body coil imbalance detection system, such as Figure 1 As shown, the system includes an electric bridge 10, a body coil 20 and a receiving device 30, wherein the electric bridge 10 is connected to the first end of the body coil 20 through a first line I1, the electric bridge 10 is connected to the second end of the body coil 20 through a second line QI, and the electric bridge 10 is electrically connected to the receiving device 30 through a third line I2 and a fourth line Q2 respectively.

[0042] In the above-designed body coil imbalance detection system, the bridge can receive the externally transmitted RF power transmission signal, and then form the RF power transmission signal into two excitation signals. For example, the first excitation signal V fwd1 and the second excitation signal V fwd2 .

[0043] The first excitation signal V fwd1 The second excitation signal V is transmitted to the body coil 20 through the first line I1. fwd2 The first excitation signal V is transmitted to the body coil 20 through the second line I2. fwd1 and the second excitation signal V fwd2 A nuclear magnetic resonance magnetic field is formed, and the nuclear magnetic resonance magnetic field excites the human tissue or animal tissue in the body coil 20 to generate two echo signals. The two echo signals can be respectively a first echo signal V rfl1 and the second echo signal V rfl2 , the first echo signal Vrfl1 The second echo signal V is transmitted to the receiving device 30 through the third line I3. rfl2 The data is transmitted to the receiving device 30 via the fourth line Q2, thereby realizing the nuclear magnetic resonance process.

[0044] In a conventionally designed nuclear magnetic resonance system, the first echo signal V rfl1 and the second echo signal V rfl2 The two-way coupler in the nuclear magnetic resonance system will collect the two-way imbalance of the body coil 20 through the two-way coupler.

[0045] However, in the nuclear magnetic resonance system, the first echo signal V rfl1 and the second echo signal V rfl2 The body coil imbalance detection system designed in this scheme can not only realize the nuclear magnetic resonance process, but also design the imbalance calculation process of the two echo signals in the receiving device that originally receives the two echo signals. rfl1 and the second echo signal V rfl2 The amplitude imbalance and phase imbalance of the two-path echo signals of the body coil 20 are determined to evaluate whether the performance of the body coil 20 has defects, thereby omitting the two-path coupler in the conventional nuclear magnetic resonance system.

[0046] The body coil imbalance detection system designed above, on the basis of realizing conventional nuclear magnetic resonance functions, transmits both the first echo signal and the second echo signal generated by the body coil to a receiving device via an electrical bridge. The receiving device determines the amplitude imbalance and phase imbalance of the two echo signals of the body coil based on the first echo signal and the second echo signal. Thus, the two-way coupler in the conventional nuclear magnetic resonance system can be omitted, thereby saving layout space, simplifying the nuclear magnetic resonance system circuit, reducing the overall volume of the nuclear magnetic resonance system, and reducing the cost of the nuclear magnetic resonance system components.

[0047] As a possible implementation, the receiving device 30 receives the first echo signal V rfl1 and the second echo signal V rfl2 After that, the receiving device can obtain the first echo signal V rfl1 The first power V1 and the second echo signal V rfl2 The amplitude imbalance of the two echo signals of the body coil can be obtained by calculating the ratio of the first power V1 to the second power V2.

[0048] The principle of calculating the power ratio of the two echo signals, that is, obtaining the amplitude imbalance of the two echo signals, is as follows:

[0049] like Figure 2 The figure shows the connection equivalent diagram of the receiving device 30 and the body coil 20. The impedance of the receiving device is set to R pre , the input impedance of the body coil is set to R coil_I and R coil_Q .

[0050] The excited human body signal is received by the transmitting body coil. Due to the symmetry and mutual difference of the body coil, V out There is always a point of equality between the I and Q paths of the body coil, and the input impedance of the I or Q path can be equivalent to R coil_I +j*X coil_I and R coil_Q +j*X coil_Q For the convenience of calculation, assume that X coil =0.

[0051] So the signal of I or Q path is at R pre The amplitude is

[0052] V Rpre =V out *(R pre / (R pre +R coil ));

[0053] Since the impedance of the receiving device is relatively small compared to the impedance of the I and Q paths and can be almost ignored, the above formula can be equivalent to:

[0054] V Rpre =V out *(R pre / R coil );

[0055] That is V Rpre_I / V Rpre_Q =R coil_I / R coil_Q ;

[0056] From the above analysis, it can be concluded that the impedance ratio of the two paths of the body coil is equal to the power ratio of the two paths of the signal. Based on this conclusion, the impedance ratio of the body coil can be characterized by the power ratio of the two paths of the echo signal of the body coil. The impedance ratio is used to characterize the amplitude imbalance of the two paths of the body coil. Therefore, the receiving device 30 can calculate the first path of the echo signal V rfl1 The first power V1 and the second echo signal V rfl2 The power ratio of the second power V2 can be used to obtain the two-way amplitude imbalance of the body coil.

[0057] In an optional implementation manner of this embodiment, this scheme may configure a preset amplitude imbalance range in the receiving device 30 in advance. After calculating the two-way amplitude imbalance of the body coil, the receiving device 30 may compare the calculated amplitude imbalance with the preset amplitude imbalance range to determine whether the calculated amplitude imbalance exceeds the preset amplitude imbalance range. If it is determined that the calculated amplitude imbalance exceeds the preset amplitude imbalance range, an alarm is generated to prompt the staff that there is a fault in the body coil; if it is determined that the calculated amplitude imbalance does not exceed the preset amplitude imbalance range, no alarm is issued, or a prompt is given that the body coil performance is normal.

[0058] In an optional implementation of this embodiment, the receiving device 30 can also obtain the first echo signal V rfl1 and the second echo signal V rfl2 The phase difference between the first echo signal and the second echo signal can be used to determine the phase imbalance between the two echo signals of the body coil. The receiving device 30 can obtain the phase difference between the two echo signals by using an ADC module in the receiving device 30 to collect the phase difference of the two echo signals.

[0059] In an optional implementation of this embodiment, after obtaining the phase imbalance of the two echo signals from the body coil, the receiving device 30 determines whether the calculated phase imbalance of the two echo signals from the body coil exceeds a preset phase imbalance range. If the phase imbalance is determined to exceed the preset phase imbalance range, an alarm is generated. Under normal circumstances, the phase difference between the two echo signals from the body coil should fluctuate around 90°. Therefore, the preset phase imbalance range designed in this solution can be [89°, 91°]. It should be noted that the designed preset phase imbalance range is only an example in this solution, and the specific range can be adaptively adjusted according to actual conditions.

[0060] In an optional implementation of this embodiment, since the echo signal of the body coil is relatively small, in order to enable the receiving device 30 to accurately measure the two echo signals of the body coil, this solution can design a preamplifier to amplify the two echo signals returned by the body coil, thereby achieving accurate measurement of the two echo signals. Figure 3 As shown, the receiving device 30 designed in this scheme may include a receiver 301, a first preamplifier 302 and a second preamplifier 303, the first preamplifier 302 is electrically connected to the third line I2, the second preamplifier 303 is electrically connected to the fourth line Q2, and the first preamplifier 302 and the second preamplifier 303 can both be electrically connected to the receiver 301.

[0061] Among them, based on the receiving device 30 designed above, the first echo signal V described aboverfl1 The first power V1 can be acquired by the first preamplifier 302, and the second echo signal V rfl2 The second power V2 can be collected by the second preamplifier 303. Of course, in addition to the power collection by the preamplifier, the receiver 301 can also collect the first echo signal V rfl1 and the second echo signal V rfl2 The power is collected.

[0062] In an optional implementation of this embodiment, if Figure 4 As shown, the bridge 10 designed in this solution may include a first two-way switch K1 and a second two-way switch K2. The bridge 10 switches the connection with the first line I1 and the third line I2 through the first two-way switch K1, and the bridge 10 switches the connection with the second line Q1 and the fourth line Q2 through the second two-way switch K2.

[0063] The present application also provides a method for detecting body coil imbalance, which is applied to the receiving device described above, such as Figure 5 As shown, the method can be implemented by the following methods, including:

[0064] Step S500: Acquire a first echo signal and a second echo signal returned by the body coil.

[0065] Step S510: determining the amplitude imbalance and phase imbalance of the two echo signals of the body coil according to the first echo signal and the second echo signal.

[0066] In the above embodiment, as described above, the receiving device may collect the first echo signal and the second echo signal returned by the body coil. As one possible embodiment, the first echo signal and the second echo signal collected by the receiving device may include signal power and signal phase. That is, the receiving device may collect the first power of the first echo signal and the second power of the second echo signal returned by the body coil, as well as the phase of the first echo signal and the phase of the second echo signal returned by the body coil.

[0067] Based on the above, the receiving device can determine the amplitude imbalance and phase imbalance of the two echo signals of the body coil based on the first echo signal and the second echo signal. Specifically, the receiving device can calculate the ratio of the first power to the second power to obtain the amplitude imbalance of the two echo signals of the body coil, and calculate the phase difference based on the phase of the first echo signal and the phase of the second echo signal to determine the phase imbalance of the two echo signals of the body coil. The specific implementation method is consistent with the method described above for detecting body coil imbalance and is not further described here.

[0068] The body coil imbalance detection method designed above uses a receiving device to determine the amplitude imbalance and phase imbalance of the two echo signals of the body coil based on the first echo signal and the second echo signal, thereby omitting the two-way coupler in the conventional MRI system, thereby saving layout space, simplifying the MRI system circuit, reducing the overall volume of the MRI system, and reducing the cost of MRI system components.

[0069] Figure 6 The present application provides a schematic structural block diagram of a body coil imbalance detection device. It should be understood that the device is Figure 5 The device corresponds to the method embodiment executed in the embodiment and is capable of executing the steps involved in the aforementioned method. The specific functions of the device can be found in the description above. To avoid repetition, a detailed description is omitted here. The device includes at least one software functional module that can be stored in a memory in the form of software or firmware or embedded in the device's operating system (OS). Specifically, the device includes: an acquisition module 600 and a determination module 610. The acquisition module 600 is used to acquire a first echo signal and a second echo signal returned by the body coil; the determination module 610 is used to determine the amplitude imbalance and phase imbalance of the two echo signals of the body coil based on the first echo signal and the second echo signal.

[0070] The body coil imbalance detection device designed above uses a receiving device to determine the amplitude imbalance and phase imbalance of the two echo signals of the body coil based on the first echo signal and the second echo signal, thereby omitting the two-way coupler in the conventional nuclear magnetic resonance system, thereby saving layout space, simplifying the nuclear magnetic resonance system circuit, reducing the overall volume of the nuclear magnetic resonance system, and reducing the cost of the nuclear magnetic resonance system components.

[0071] In an optional implementation manner of this embodiment, the determination module 610 is specifically configured to obtain a first power of the first echo signal and a second power of the second echo signal; calculate a ratio of the first power to the second power to obtain an amplitude imbalance of the two echo signals of the body coil; obtain a phase difference between the first echo signal and the second echo signal; and determine a phase imbalance of the two echo signals of the body coil based on the phase difference between the first echo signal and the second echo signal.

[0072] According to some embodiments of the present application, Figure 7As shown, the present application provides an electronic device 7, including: a processor 701 and a memory 702, the processor 701 and the memory 702 are interconnected and communicate with each other via a communication bus 703 and / or other forms of connection mechanisms (not shown), and the memory 702 stores a computer program executable by the processor 701. When the computing device is running, the processor 701 executes the computer program to execute the method performed by the receiving device in any optional implementation, such as steps S500 to S510: obtaining a first echo signal and a second echo signal returned by the body coil; and determining the amplitude imbalance and phase imbalance of the two echo signals of the body coil based on the first echo signal and the second echo signal.

[0073] The present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method in any of the aforementioned optional implementations is executed.

[0074] Among them, the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0075] The present application provides a computer program product. When the computer program product is run on a computer, the computer is enabled to execute the method in any optional implementation manner.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A body coil imbalance detection system, characterized in that: The system includes a bridge, a body coil and a receiving device; The bridge is used to transmit the first excitation signal and the second excitation signal to the body coil, so that the body coil forms a magnetic field and generates the first echo signal and the second echo signal, and transmits the first echo signal and the second echo signal to the receiving device; The receiving device is used to determine the amplitude imbalance and phase imbalance of the two echo signals of the body coil according to the first echo signal and the second echo signal.

2. The system according to claim 1, wherein: The receiving device is specifically used to obtain the first power of the first echo signal and the second power of the second echo signal; calculate the ratio of the first power to the second power to obtain the amplitude imbalance of the two echo signals of the body coil.

3. The system according to claim 2, characterized in that After obtaining the amplitude imbalance of the two echo signals of the body coil, the receiving device is further used to determine whether the calculated amplitude imbalance exceeds a preset amplitude imbalance range, and generate an alarm if it is determined that the amplitude imbalance exceeds the preset amplitude imbalance range.

4. The system according to claim 1, wherein: The receiving device is further specifically configured to obtain a phase difference between the first echo signal and the second echo signal, and determine a phase imbalance between the two echo signals of the body coil according to the phase difference between the first echo signal and the second echo signal.

5. The system according to claim 4, characterized in that The receiving device is further specifically configured to, after obtaining the phase imbalance of the two echo signals of the body coil, determine whether the calculated phase imbalance of the two echo signals of the body coil exceeds a preset phase imbalance range; and generate an alarm if it is determined that the phase imbalance exceeds the preset phase imbalance range.

6. The system according to claim 1, wherein: The bridge is connected to the first end of the body coil via a first line, the bridge is connected to the second end of the body coil via a second line, and the bridge is electrically connected to the receiving device via a third line and a fourth line respectively.

7. The system according to claim 6, characterized in that The system further includes a first two-way switch and a second two-way switch; the bridge switches connections with the first circuit and the third circuit via the first two-way switch, and the bridge switches connections with the second circuit and the fourth circuit via the second two-way switch.

8. The system according to claim 6, wherein: The receiving device includes a receiver, a first preamplifier and a second preamplifier. The bridge is electrically connected to the first preamplifier through a third line, the bridge is electrically connected to the second preamplifier through a fourth line, and the receiver is electrically connected to the first preamplifier and the second preamplifier respectively.

9. A method for detecting body coil imbalance, characterized in that: The method is applied to the receiving device according to any one of claims 1 to 8, and the method includes: Acquiring a first echo signal and a second echo signal returned by the body coil; The amplitude imbalance and phase imbalance of the two echo signals of the body coil are determined according to the first echo signal and the second echo signal.

10. The method according to claim 9, characterized in that The determining of the amplitude imbalance and phase imbalance of the two echo signals of the body coil according to the first echo signal and the second echo signal includes: Acquire a first power of the first echo signal, and acquire a second power of the second echo signal; Calculating the ratio of the first power to the second power to obtain the amplitude imbalance of the two echo signals of the body coil; Obtaining a phase difference between a first echo signal and a second echo signal; The phase imbalance of the two echo signals of the body coil is determined according to the phase difference between the first echo signal and the second echo signal.

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