Automatic matching system, control method and terminal of magnetic resonance transmitting coil

Abstract

The present invention provides an automatic matching system, a control method and a terminal for a magnetic resonance transmitting coil, which automatically adjust the matching by detecting the matching scattering parameter value of the transmitting coil during the movement of the bed and driving the inductor or capacitor in the matching circuit to obtain a plurality of matching circuit implementation modes of suitable matching parameter values, and realize automatic matching of the transmitting coil for objects of various sizes to be examined without increasing the original volume of the transmitting coil by minimizing the matching circuit.

Description

Technical Field

[0001] The present invention relates to the field of magnetic resonance applications, and in particular to an automatic matching system, a control method and a terminal for a magnetic resonance transmitting coil. Background Art

[0002] The transmitting coil in the magnetic resonance system plays the role of transferring high-power radio frequency energy to human tissue. The efficiency of the transmitting coil will affect the amplification capacity of the radio frequency amplifier and the safety of energy absorption by the human body. Therefore, the working efficiency of the transmitting coil needs to be as high as possible, and the matching of the transmitting coil and different human body loads is the biggest factor determining the efficiency. At present, the matching of the transmitting coil in the magnetic resonance system on the market is based on a larger human body load such as 90kg-120kg, which can cover 99% of the body shape. At this time, the efficiency is highest when the human body load is the heaviest. Human body loads of other weights are in a mismatched state, and the efficiency of the transmitting coil is not in the optimal state. In conventional scans, more than 70% of the subjects to be examined weigh less than 90kg, which means that the transmitting coil does not reach the optimal state during most scans.

[0003] At present, some patents have proposed some automatic matching measures for coils, such as CN107209235B and CN103649767B, which proposed to achieve coil matching for different loads by switching multiple sets of different matching circuits. However, the above methods can only guarantee the matching of the transmitting coil to a certain extent, and may not achieve the best matching for some objects of intermediate size to be inspected; and the switch matching network needs to be equipped with a large number of different matching circuits to adapt to the matching of different weights, which will cause the matching circuit of the coil component to become bloated and bulky. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an automatic matching system, control method and terminal for a magnetic resonance transmitting coil, so as to solve the problems in the prior art that the matching of transmitting coils for different human body shapes in the magnetic resonance system is not adaptable, the matching efficiency is low and automatic matching cannot be achieved, and the matching circuit of the coil component becomes bloated and bulky due to the addition of the transmitting coil.

[0005] To achieve the above-mentioned object and other related objects, the present invention provides an automatic matching system for a magnetic resonance transmitting coil, the system comprising: a coupler for real-time detecting the current scattering parameters of the transmitting coil when a bed loaded with an object to be examined moves toward the transmitting coil;

[0006] A matching control device, connected to the coupler, for determining whether the current scattering parameter reaches a preset scattering parameter value corresponding to the current bed stroke set according to the weight distribution of the subject to be examined, and generating a corresponding matching control signal when the preset scattering parameter value is not reached;

[0007] A matching circuit is connected to the matching control device and is used to adjust its capacitance value or inductance value according to the matching control signal so as to adjust the current scattering parameter of the transmitting coil to its corresponding preset scattering parameter value.

[0008] In one embodiment of the present invention, the matching control device includes: an acquisition module, which is used to acquire in real time the scattering parameters of the transmitting coil and the corresponding current bed stroke when the bed loaded with the object to be inspected moves towards the transmitting coil; a judgment module, connected to the acquisition unit, which is used to judge whether the current scattering parameter reaches the preset scattering parameter value corresponding to the current bed stroke set according to the weight distribution of the object to be inspected; and a matching control module, which is connected to the judgment module, which is used to generate a matching control signal for adjusting the capacitance value or the inductance value of the matching circuit according to the current scattering parameter and the corresponding preset scattering parameter value when it is judged that the value has not been reached.

[0009] In one embodiment of the present invention, the method for setting the preset scattering parameter value includes: obtaining the weight distribution of the object to be inspected based on weight data collected by multiple pressure sensing devices installed on the bed, and setting the preset scattering parameter value corresponding to each bed stroke.

[0010] In one embodiment of the present invention, there are four pressure sensing devices, which are respectively placed at the four corners of the object bearing surface of the bed; or, there are six pressure sensing devices, which are respectively placed at the four corners of the object bearing surface of the bed and in the middle of the two sides of the long side of the bed bearing surface.

[0011] In one embodiment of the present invention, the matching circuit includes: a capacitor stepless adjustment device, including: a capacitor upper plate and a capacitor lower plate; the capacitor stepless adjustment device performs a corresponding gradual adjustment on the capacitance value by adjusting the facing area between the capacitor upper plate and the capacitor lower plate; and / or, an inductor stepless adjustment device, including: an inductor coil body and an inductor core wrapped with a high-voltage resistant dielectric layer; the inductor stepless adjustment device performs a corresponding gradual adjustment on the inductance value by adjusting the size of the inductor coil body including the inductor core.

[0012] In one embodiment of the present invention, a high voltage resistant dielectric layer is provided between the capacitor upper plate and the capacitor lower plate.

[0013] In one embodiment of the present invention, the capacitor bottom plate is an irregular shape with a gradually changing area, so that when the capacitor top plate and the capacitor bottom plate move relative to each other in one direction, the facing area of ​​the two gradually increases or decreases.

[0014] In an embodiment of the present invention, the matching circuit is one of an L-type network, a T-type network and a Pi-type network.

[0015] To achieve the above-mentioned purpose and other related purposes, the present invention provides an automatic matching control method for a magnetic resonance transmitting coil, the method comprising: obtaining in real time a current scattering parameter of the transmitting coil and a current bed stroke corresponding thereto when a bed loaded with a subject to be examined moves toward the transmitting coil as detected by a coupler; judging whether the current scattering parameter reaches a preset scattering parameter value corresponding to the current bed stroke set according to the weight distribution of the subject to be examined; and when judging that the current scattering parameter has not reached the preset scattering parameter value, generating a matching control signal for adjusting a capacitance value or an inductance value of the matching circuit according to the current scattering parameter and the preset scattering parameter value corresponding thereto, so as to make the matching circuit adjust its capacitance value or inductance value, so as to adjust the current scattering parameter of the transmitting coil to its corresponding preset scattering parameter value.

[0016] To achieve the above-mentioned object and other related objects, the present invention provides an automatic matching control terminal for a magnetic resonance transmitting coil, comprising: a memory for storing a computer program; and a processor for executing the automatic matching method for the magnetic resonance transmitting coil.

[0017] As described above, the present invention is an automatic matching system, control method and terminal for a magnetic resonance transmitting coil, which has the following beneficial effects: the present invention provides an automatic matching system for a magnetic resonance transmitting coil, which automatically adjusts the matching by detecting the matching scattering parameter value of the transmitting coil during the movement of the bed and driving the inductor or capacitor in the matching circuit to obtain a variety of matching parameter values, and realizes automatic matching of the transmitting coil for objects of various sizes to be examined without increasing the original size of the transmitting coil by minimizing the matching circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic diagram of an application scenario in an embodiment of the present invention.

[0019] Figure 2 Shown is a schematic diagram of an automatic matching system for a magnetic resonance transmitting coil in one embodiment of the present invention.

[0020] Figure 3 It is a schematic diagram showing the structure of a matching circuit in one embodiment of the present invention.

[0021] Figure 4 It is a schematic diagram showing the structure of a matching circuit in one embodiment of the present invention.

[0022] Figure 5 It is a schematic diagram of the structure of a capacitor stepless adjustment device in one embodiment of the present invention.

[0023] Figure 6 It is a schematic diagram of the structure of a capacitor stepless adjustment device in one embodiment of the present invention.

[0024] Figure 7 It is a schematic diagram of the structure of a capacitor stepless adjustment device in one embodiment of the present invention.

[0025] Figure 8 It is a schematic diagram of the structure of an inductor stepless adjustment device in one embodiment of the present invention.

[0026] Fig. 9 Shown is a schematic diagram of an automatic matching system for a magnetic resonance transmitting coil in one embodiment of the present invention.

[0027] Fig.10 Shown is a schematic diagram of a matching process in an embodiment of the present invention.

[0028] Fig.11 It is a schematic flow chart of an automatic matching control method of a magnetic resonance transmitting coil in one embodiment of the present invention.

[0029] Fig.12 Shown is a schematic structural diagram of an automatic matching control terminal for a magnetic resonance transmitting coil in one embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0031] It should be noted that in the following description, reference is made to the accompanying drawings, which describe several embodiments of the present invention. It should be understood that other embodiments may also be used, and that mechanical composition, structural, electrical and operational changes may be made without departing from the spirit and scope of the present invention. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present invention is limited only by the claims of the published patents. The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0032] Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a part is said to "include" a certain constituent element, unless otherwise stated, it does not exclude other constituent elements, but means that other constituent elements may be included.

[0033] The terms first, second and third mentioned herein are used to describe various parts, components, regions, layers and / or segments, but are not limited thereto. These terms are only used to distinguish a certain part, component, region, layer or segment from other parts, components, regions, layers or segments. Therefore, the first part, component, region, layer or segment described below may refer to the second part, component, region, layer or segment within the scope of the present invention.

[0034] Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions or operations is inherently mutually exclusive in some way.

[0035] An embodiment of the present invention provides an automatic matching system for a magnetic resonance transmitting coil, which automatically adjusts the matching by detecting the matching scattering parameter value of the transmitting coil during the movement of the bed and driving the inductor or capacitor in the matching circuit to obtain a variety of matching circuit implementation modes for obtaining appropriate matching parameter values, and realizes automatic matching of the transmitting coil for objects of various sizes to be examined without increasing the original volume of the transmitting coil by minimizing the matching circuit.

[0036] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention can be embodied in many different forms and is not limited to the embodiments described herein.

[0037] like Figure 1 As shown, a schematic diagram of an application scenario in an embodiment of the present application is shown.

[0038] In this embodiment, a magnetic resonance transmitting coil 11, a bed 12 loaded with an object to be examined, and an automatic matching system 13 for magnetic resonance transmitting coils are shown in the scene; wherein the transmitting coil 11 has a space for accommodating the object to be examined; the bed 12 is connected to a bed driving mechanism 14 to drive the bed to move toward the transmitting coil. The automatic matching system 13 for magnetic resonance transmitting coils is connected to the transmitting coil 11 and the bed driving mechanism 14, and is used to automatically match the scattering parameters of the transmitting coil corresponding to the bed travel while the bed is moving.

[0039] In this embodiment, the driving signal of the bed driving mechanism 14 can be used to achieve synchronization with the automatic matching system of the magnetic resonance transmitting coil 11. The shorter the bed travels, the smaller the equivalent load of the subject to be examined entering the transmitting coil, that is, the smaller the required adjustment matching range; the longer the bed travels, the greater the equivalent load of the subject to be examined entering the transmitting coil, that is, the greater the required adjustment matching range. In this way, the matching of the transmitting coil to different human body shapes and different scanning parts is completed at the same time as entering the bed, and no scanning time is taken up, which greatly improves the efficiency of the entire process.

[0040] It should be noted that the automatic matching system of the magnetic resonance transmitting coil can utilize any matching network circuit form, use the method of real-time monitoring of the scattering parameters of the transmitting coil, and realize the matching technology of different human body shapes by fully automatically checking feedback and adjusting the inductance or capacitance in the matching circuit.

[0041] like Figure 2 As shown, a structural schematic diagram of an automatic matching system for a magnetic resonance transmitting coil is shown.

[0042] The system comprises:

[0043] The coupler 21 is used to detect the current scattering parameters of the transmitting coil in real time under the current bed travel when the bed carrying the object to be detected moves toward the transmitting coil;

[0044] The matching control device 22 is connected to the coupler 21 and is used to determine whether the current scattering parameter reaches the preset scattering parameter value corresponding to the current bed stroke set by the weight distribution of the subject to be examined, and to generate a corresponding matching control signal if it is not reached; if it is reached, the matching is stopped;

[0045] The matching circuit 23 is connected to the matching control device 22 and is used to adjust its capacitance value or inductance value according to the matching control signal so as to adjust the current scattering parameter of the transmitting coil to its corresponding preset scattering parameter value.

[0046] In this embodiment, the automatic matching system of the magnetic resonance transmitting coil can realize one or more matching cycles; during the matching process, since the bed is constantly moving, the coupler 21 monitors the scattering parameter of the transmitting coil in real time. When the matching circuit 23 adjusts the scattering parameter to a preset scattering parameter value corresponding to the bed travel, the parameter value is the current scattering parameter of the transmitting coil, and then enters the next round of matching, that is, the matching control device 22 determines whether the preset scattering parameter value of the current bed travel is reached. If so, the matching of the transmitting coil is stopped to maintain operation with the scattering parameter; if not, the scattering parameter is adjusted, and then the next round of matching is entered until it is determined that the current scattering parameter reaches the corresponding preset scattering parameter value.

[0047] Optionally, the matching control device 22 includes: an acquisition module, which is used to acquire in real time the current scattering parameters of the transmitting coil and the corresponding current bed stroke when the bed loaded with the object to be tested moves toward the transmitting coil; wherein the current bed stroke can be synchronously obtained by the bed driving mechanism. A judgment module, connected to the acquisition module, is used to judge whether the current scattering parameter reaches the preset scattering parameter value corresponding to the current bed stroke set by the weight distribution of the object to be tested; if it reaches, the matching is terminated. A matching control module, connected to the judgment module, is used to generate a matching control signal for adjusting the capacitance value or inductance value of the matching circuit according to the current scattering parameter and the corresponding preset scattering parameter value when it is judged that it has not been reached.

[0048] Optionally, the matching control module is further used to calculate the capacitance value or inductance value that needs to be adjusted according to the current scattering parameter and its corresponding preset scattering parameter value; and generate a corresponding matching control signal based on the calculated capacitance value or inductance value that needs to be adjusted.

[0049] Optionally, the preset scattering parameter value is set in a manner including: obtaining the weight distribution of the subject to be inspected based on the weight data collected by multiple pressure sensors disposed on the bed, and setting the preset scattering parameter value corresponding to each bed stroke, wherein the preset scattering parameter value is proportional to the weight and the bed stroke.

[0050] For example, multiple pressure sensors are set on the hospital bed. After the subject to be tested successfully lies on the bed, the value fed back by the pressure sensor is calculated in the software to obtain the actual weight of the subject to be tested. Before the bed starts to drive, after the subject to be tested completes positioning on the bed, the preset scattering parameter values ​​corresponding to different strokes of the bed are set according to the obtained weight distribution.

[0051] Preferably, four sensors are provided, which are respectively arranged at the four corners of the bearing surface of the patient bed for the subject to be inspected, so as to accommodate subjects to be inspected of different sizes.

[0052] Preferably, six sensors are provided, which are respectively arranged at the four corners of the bearing surface of the bed for the object to be inspected and at the center of both sides of the long sides of the bearing surface of the bed, so as to accommodate objects to be inspected of different sizes.

[0053] Optionally, the matching circuit includes: a capacitance adjustment device and / or an inductance adjustment device. Specifically, the matching circuit is configured in the following ways:

[0054] The first type: Figure 3 As shown, the matching circuit includes: a capacitance adjustment device and a non-adjustable grounding inductance device; wherein the matching circuit adjusts the capacitance value through the capacitance adjustment device so that the current scattering parameter of the transmitting coil is adjusted to its corresponding preset scattering parameter value;

[0055] The second type: Figure 4 As shown, the matching circuit includes: an inductance adjustment device and a non-adjustable grounding capacitor device; wherein the matching circuit adjusts the inductance value through the inductance adjustment device so that the current scattering parameter of the transmitting coil is adjusted to its corresponding preset scattering parameter value;

[0056] The third type: the matching circuit includes: a capacitance adjustment device and an inductance adjustment device; wherein the matching circuit adjusts the capacitance value through the capacitance adjustable device so that the current scattering parameter of the transmitting coil is adjusted to its corresponding preset scattering parameter value; or adjusts the inductance value through the inductance adjustment device so that the current scattering parameter of the transmitting coil is adjusted to its corresponding preset scattering parameter value.

[0057] It should be noted that the circuit form of the matching circuit is not limited to Figure 3 as well as Figure 4 The described form can also be any form; for example, the matching circuit is one of an L-type network, a T-type network and a Pi-type network.

[0058] Optionally, the matching circuit can achieve matching of different human body shapes by a non-switch selection method through a gradual change of the capacitance or inductance value in the stereotyped matching circuit, that is, the capacitance adjustment device can be a capacitance stepless adjustment device, and the inductance adjustment device can be an inductance stepless adjustment device; the matching circuit 23 includes: a capacitance stepless adjustment device and / or an inductance stepless adjustment device;

[0059] Among them, Figure 5 As shown, the capacitor stepless adjustment device includes: a capacitor upper plate and a capacitor lower plate; the capacitor stepless adjustment device adjusts the capacitance value accordingly by adjusting the facing area between the capacitor upper plate and the capacitor lower plate.

[0060] The capacitance can be calculated according to the capacitance calculation formula, which is as follows:

[0061]

[0062] Wherein, ε is a constant, S is the area facing each other of the capacitor plates, d is the distance between the capacitor plates, and k is the electrostatic force constant. The capacitor stepless adjustment device changes the area facing each other between the S capacitor plates to achieve proportional adjustment of the capacitance. Optionally, the forward and backward movement driving source of the capacitor upper plate can be provided by the bed driving mechanism.

[0063] For example, if Figure 3 As shown, the matching circuit adopts a typical L-type network for matching adjustment. While the bed is moving, the motor can drive the mechanism to slide the upper plate of the adjustable capacitor, so that the corresponding capacitance value changes to adjust the impedance obtained by matching. The value of the adjustable capacitor can be calculated as follows:

[0064]

[0065] Among them, Z p is the impedance of the RF power amplifier, Zt is the impedance of the transmitting coil, and ω is the angular frequency.

[0066] like Figure 8 As shown, the inductance stepless adjustment device includes: an inductance coil body and an inductance core wrapped with a high-voltage resistant dielectric layer; the inductance stepless adjustment device performs corresponding gradual adjustment on the inductance value by adjusting the size of the inductance coil body including the inductance core.

[0067] The inductor core can be moved forward and backward, so that the amount of core material contained in the inductor coil body determines the size of the overall inductance value. The inductor stepless adjustment device adjusts the inductance value by moving the core position to change the size of the core material inside the inductor coil and thus affecting the change of magnetic flux. At the same time, the driving source for the forward and backward movement of the inductor core can be provided by the bed driving mechanism. It should be noted that the inductor core is a non-ferrite material core, preferably copper or aluminum.

[0068] For example, if Figure 4 As shown, the matching circuit adopts a typical L-type network for matching adjustment. While the bed is moving, the motor can drive the mechanism to move and adjust the inductor core of the adjustable inductor, so that the corresponding inductance value changes to adjust the impedance obtained by matching. The value of the adjustable inductor can be calculated as follows:

[0069]

[0070] Among them, Z p is the impedance of the RF power amplifier, Zt is the impedance of the transmitting coil, and ω is the angular frequency.

[0071] Optional, such as Figure 6 As shown, a high-voltage resistant dielectric layer is provided between the upper capacitor sheet and the lower capacitor sheet.

[0072] Optionally, the capacitor bottom plate is an irregular shape with a gradually changing area, so that when the capacitor top plate and the capacitor bottom plate move relative to each other in one direction, the facing area of ​​the two gradually increases or decreases. Figure 7 As shown, as the upper capacitor plate moves forward and backward, the area facing the lower capacitor plate of irregular shape with gradually changing area gradually changes.

[0073] In order to better describe the automatic matching system of the magnetic resonance transmitting coil, a specific embodiment is provided;

[0074] Embodiment 1: An automatic matching system for a magnetic resonance transmitting coil; Fig. 9 As shown, it is a structural diagram of the automatic matching system of this embodiment.

[0075] The system comprises: a directional coupler provided at a matching port of a transmitting coil, a control terminal and a matching circuit connected to the transmitting coil;

[0076] Wherein, the directional coupler is used to detect in real time the incident and reflected power of the transmitting coil when the bed loaded with the object to be inspected moves towards the transmitting coil to obtain the current scattering parameter; the matching situation can be obtained through the proportional relationship between the incident and reflected power. The control terminal is connected to the coupler and is used to determine whether the current scattering parameter reaches the preset scattering parameter value corresponding to the current bed travel set by the weight distribution of the object to be inspected, and generates a corresponding matching control signal when it is not reached. The matching circuit is connected to the control terminal and is used to adjust its capacitance value or inductance value according to the matching control signal so that the current scattering parameter of the transmitting coil is adjusted to its corresponding preset scattering parameter value.

[0077] While the patient's bed is moving, the value obtained by stimulating low-power radio frequency through the directional coupler is used to convert the ratio of radio frequency power entering and reflected into and out of the human body load, and then estimate the possible SAR value when the power rises as a precaution.

[0078] In this embodiment, the automatic matching system of the magnetic resonance transmission coil can implement one or more matching cycles; Fig.10As shown, it is a flow chart of matching using the automatic matching system of the magnetic resonance transmitting coil. During the matching process, since the bed is constantly moving, when the bed starts to send the subject to be tested into the transmitting coil, the positioning coupler monitors the scattering parameters of the transmitting coil in real time, and the control terminal determines whether the current scattering parameter reaches the preset scattering parameter value corresponding to the current bed travel set by the weight distribution of the subject to be tested. If so, the matching is terminated; if not, the scattering parameter is adjusted to the preset scattering parameter value corresponding to the bed travel by the matching circuit, and the parameter value is the current scattering parameter of the transmitting coil, and then the next round of matching is entered, that is, the control terminal determines whether the preset scattering parameter value of the current bed travel is reached, and if so, the matching of the transmitting coil is stopped to maintain the work with the scattering parameter; if not, the scattering parameter is adjusted, and then the next round of matching is entered, and the adjustment structure is driven in a cycle until it is determined that the current scattering parameter reaches the corresponding preset scattering parameter value. This scheme can realize the real-time automatic matching of the scattering parameters of the transmitting coil according to the bed travel, saving adjustment time.

[0079] Similar to the principle of the above embodiment, the present invention provides an automatic matching control method for a magnetic resonance transmitting coil.

[0080] The following provides specific embodiments in conjunction with the accompanying drawings:

[0081] like Fig.11 A schematic flow chart showing an automatic matching control method for a magnetic resonance transmitting coil according to an embodiment of the present invention.

[0082] The method comprises:

[0083] Step S111: acquiring in real time the current scattering parameters of the transmitting coil and the corresponding current bed travel when the bed loaded with the object to be detected moves toward the transmitting coil as detected by the coupler;

[0084] Step S112: determining whether the current scattering parameter reaches a preset scattering parameter value corresponding to the current bed stroke set according to the weight distribution of the subject to be examined.

[0085] Optionally, step S112 includes: comparing the current scattering parameter with a preset scattering parameter value corresponding to the current bed travel set according to the weight distribution of the subject to be examined, and determining whether the current scattering parameter reaches the corresponding preset scattering parameter value, and if so, ending the matching.

[0086] Optionally, the method for setting the preset scattering parameter value includes: obtaining the weight distribution of the object to be inspected based on the weight data collected by multiple pressure sensing devices arranged on the bed, and setting the preset scattering parameter value corresponding to each bed stroke. The preset scattering parameter value is proportional to the body weight and the bed stroke. Preferably, four sensors are provided, which are respectively arranged at the four corners of the bearing surface of the bed for the object to be inspected, so as to accommodate objects to be inspected of different sizes. Preferably, six sensors are provided, which are respectively arranged at the four corners of the bearing surface of the bed for the object to be inspected and in the center of the long sides of the bearing surface of the bed, so as to accommodate objects to be inspected of different sizes.

[0087] Step S113: When it is determined that the requirement is not reached, a matching control signal for adjusting the capacitance value or the inductance value of the matching circuit is generated according to the current scattering parameter and its corresponding preset scattering parameter value, so that the matching circuit adjusts its capacitance value or inductance value, so that the current scattering parameter of the transmitting coil is adjusted to its corresponding preset scattering parameter value.

[0088] Optionally, a capacitance value or an inductance value that needs to be adjusted is calculated according to the current scattering parameter and its corresponding preset scattering parameter value; and a corresponding matching control signal is generated based on the calculated capacitance value or inductance value that needs to be adjusted.

[0089] Optionally, the matching circuit includes: a capacitor stepless adjustment device, including: a capacitor upper plate and a capacitor lower plate; the capacitor stepless adjustment device performs a corresponding gradual adjustment on the capacitance value by adjusting the facing area between the capacitor upper plate and the capacitor lower plate; and / or, an inductance stepless adjustment device, including: an inductance coil body and an inductance core wrapped with a high-voltage resistant dielectric layer; the inductance stepless adjustment device performs a corresponding gradual adjustment on the inductance value by adjusting the size of the inductance coil body including the inductance core.

[0090] Optionally, a high-voltage resistant dielectric layer is provided between the capacitor upper sheet and the capacitor lower sheet.

[0091] Optionally, the capacitor lower plate is an irregular shape with a gradually changing area, so that when the capacitor upper plate and the capacitor lower plate move relative to each other in one direction, the facing area of ​​the two gradually increases or decreases.

[0092] Optionally, the matching circuit is one of an L-type network, a T-type network and a Pi-type network.

[0093] like Fig.12 A schematic diagram showing the structure of the automatic matching control terminal 120 for the magnetic resonance transmitting coil in an embodiment of the present invention is shown.

[0094] The automatic matching control terminal 120 of the magnetic resonance transmitting coil includes: a memory 121 and a processor 122. The memory 121 is used to store computer programs; the processor 122 runs the computer program to implement the following Figure 1 The automatic matching control method of the magnetic resonance transmitting coil.

[0095] Optionally, the number of the memory 121 can be one or more, the number of the processor 122 can be one or more, and Fig.12 Take one as an example.

[0096] Optionally, the processor 122 in the automatic matching control terminal 120 of the magnetic resonance transmitting coil will Figure 1 In the above steps, one or more instructions corresponding to the process of the application are loaded into the memory 121, and the processor 122 runs the application stored in the first memory 121, thereby achieving the following Figure 1 Various functions in the automatic matching control method of the magnetic resonance transmitting coil.

[0097] Optionally, the memory 121 may include but is not limited to high-speed random access memory and non-volatile memory. For example, one or more disk storage devices, flash memory devices or other non-volatile solid-state storage devices; the processor 122 may include but is not limited to a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0098] Optionally, the processor 122 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0099] In summary, the automatic matching system, control method and terminal of the magnetic resonance transmitting coil of the present invention automatically adjust the matching by detecting the matching scattering parameter value of the transmitting coil during the movement of the bed and driving the inductor or capacitor in the matching circuit to obtain a suitable matching parameter value through a variety of matching circuit implementation methods, and realize the automatic matching of the transmitting coil for various body shapes of the objects to be examined without increasing the original volume of the transmitting coil by minimizing the matching circuit. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0100] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An automatic matching system for a magnetic resonance transmitting coil, characterized in that: The system comprises: A coupler, used for real-time detection of current scattering parameters of the transmitting coil when the bed loaded with the object to be detected moves toward the transmitting coil; A matching control device, connected to the coupler, for determining whether the current scattering parameter reaches a preset scattering parameter value corresponding to the current bed stroke set according to the weight distribution of the subject to be examined, and generating a corresponding matching control signal when the preset scattering parameter value is not reached; a matching circuit, connected to the matching control device, and configured to adjust its capacitance value or inductance value according to the matching control signal, so as to adjust the current scattering parameter of the transmitting coil to its corresponding preset scattering parameter value; The setting method of the preset scattering parameter value includes: The weight distribution of the subject to be inspected is obtained according to the weight data collected by a plurality of pressure sensing devices arranged on the bed, and a preset scattering parameter value corresponding to each bed stroke is set.

2. The automatic matching system for magnetic resonance transmitting coils according to claim 1, characterized in that: The matching control device comprises: An acquisition module, used for acquiring in real time the scattering parameters of the transmitting coil and the corresponding current bed travel when the bed carrying the object to be inspected moves towards the transmitting coil; A judgment module, connected to the acquisition module, for judging whether the current scattering parameter reaches a preset scattering parameter value corresponding to the current bed travel set according to the weight distribution of the subject to be examined; A matching control module is connected to the judgment module and is used to generate a matching control signal for adjusting the capacitance value or the inductance value of the matching circuit according to the current scattering parameter and its corresponding preset scattering parameter value when it is judged that the value is not reached.

3. The automatic matching system for magnetic resonance transmission coils according to claim 1, characterized in that: There are four pressure sensing devices, which are respectively placed at the four corners of the bed's object bearing surface; or, there are six pressure sensing devices, which are respectively placed at the four corners of the bed's object bearing surface and in the middle of both sides of the long side of the bed's bearing surface.

4. The automatic matching system for magnetic resonance transmitting coils according to claim 1, characterized in that: The matching circuit comprises: The capacitor stepless adjustment device comprises: an upper capacitor sheet and a lower capacitor sheet; the capacitor stepless adjustment device adjusts the capacitance value gradually by adjusting the facing area between the upper capacitor sheet and the lower capacitor sheet; And / or, an inductance stepless adjustment device, comprising: an inductance coil body and an inductance core wrapped with a high-voltage resistant dielectric layer; the inductance stepless adjustment device performs a corresponding gradual adjustment on the inductance value by adjusting the size of the inductance coil body including the inductance core.

5. The automatic matching system for magnetic resonance transmitting coils according to claim 4, characterized in that: A high voltage resistant dielectric layer is provided between the capacitor upper plate and the capacitor lower plate.

6. The automatic matching system for magnetic resonance transmitting coils according to claim 4 or 5, characterized in that: The capacitor lower plate is an irregular shape with a gradually changing area, so that when the capacitor upper plate and the capacitor lower plate move relatively in one direction, the facing area of ​​the two gradually increases or decreases.

7. The automatic matching system for magnetic resonance transmitting coils according to claim 1 or 4, characterized in that: The matching circuit is one of an L-type network, a T-type network and a Pi-type network.

8. An automatic matching control method for a magnetic resonance transmitting coil, characterized in that: The method comprises: Real-time acquisition of the current scattering parameters of the transmitting coil and the corresponding current bed travel when the bed loaded with the subject to be detected moves toward the transmitting coil as detected by the coupler; Determining whether the current scattering parameter reaches a preset scattering parameter value corresponding to the current bed travel set according to the weight distribution of the subject to be examined; When it is determined that the value has not been reached, a matching control signal for adjusting the capacitance value or the inductance value of the matching circuit is generated according to the current scattering parameter and its corresponding preset scattering parameter value, so that the matching circuit adjusts its capacitance value or inductance value, so that the current scattering parameter of the transmitting coil is adjusted to its corresponding preset scattering parameter value.

9. An automatic matching control terminal for a magnetic resonance transmitting coil, characterized in that: include: Memory for storing computer programs; A processor, configured to execute the automatic matching control method for a magnetic resonance transmitting coil as claimed in claim 8.

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