WO2018214651A1

WO2018214651A1 - Self-transmitting and self-receiving birdcage array coil and control circuit therefor

Info

Publication number: WO2018214651A1
Application number: PCT/CN2018/082131
Authority: WO
Inventors: 李建中
Original assignee: 深圳市金石医疗科技有限公司
Priority date: 2017-05-20
Filing date: 2018-04-08
Publication date: 2018-11-29
Also published as: CN106950520A; CN106950520B

Abstract

Provided is a self-transmitting and self-receiving birdcage array coil, comprising: a first end ring, on which is provided a plurality of first end ring capacitors; a second end ring, on which is provided a plurality of second end ring capacitors; a plurality of legs, lower ends of which are connected to the first end ring, and upper ends of which are connected to the second end ring; and a ring body, which is provided between the first end ring and the second end ring, wherein directions of diodes on each leg are the same, directions of diodes on adjacent legs are the opposite, and the ring body is provided with a plurality of third capacitors. Also provided is a control circuit for the self-transmitting and self-receiving birdcage array coil, which uses at least a two-level power divider so that each of two or more birdcage coils obtains an orthogonal signal pair with equal power, equal feed is conducted on each coil, and each transmit-receive control sub-circuit includes a power divider, an emission control circuit, a transmit-receive isolation circuit and a reception amplification circuit. The present application solves the problem of a low signal-to-noise ratio of each birdcage radio-frequency coil, and the problem of coupling interference between an emission coil and a receiving coil.

Description

说明书发明名称：自发自收的鸟笼阵列线圈及其控制电路 Title: Inventive Name: Self-receiving bird cage array coil and its control circuit

[0001] 本申请是以申请号为 201710360100.9，申请日为 2017年 5月 20日的中国专利申请为基础，并主张其优先权，该申请的全部内容在此作为整体引入本申请中。 [0001] The present application is based on a Chinese patent application filed on Jan. 20, 2017, the entire disclosure of which is hereby incorporated by reference.

[0002] 技术领域 Technical Field

[0003] 本申请涉及一种自发自收的鸟笼阵列线圈及其控制电路。 [0003] The present application relates to a self-receiving bird cage array coil and its control circuit.

[0004] 背景技术 BACKGROUND OF THE INVENTION

[0005] 目前一般鸟笼线圈（又称作 birdcage coil, 简称为 BC) 在设计上要求其直径（D [0005] At present, the general bird cage coil (also known as birdcage coil, referred to as BC) is designed to have its diameter (D).

) 和长度基本相同或者长度（L) 略小于直径，否则会降低线圈的发射效率，所以目前的鸟笼线圈基本上都会采用 D«L这一原则。为了进一步提高鸟笼线圈作为接收线圈的信噪比， Uli Gotshal等人提出来在纵向方向上用两个鸟笼线圈或者多个鸟笼线圈级联起来，对于单个鸟笼线圈而言， D«2L，形成鸟笼阵列线圈，相对于同样直径和长度的单个鸟笼线圈，信噪比会提升 15~20%。 ) It is basically the same length or the length (L) is slightly smaller than the diameter, otherwise it will reduce the emission efficiency of the coil. Therefore, the current bird cage coil basically adopts the principle of D«L. In order to further improve the signal-to-noise ratio of the birdcage coil as a receiving coil, Uli Gotshal et al. proposed to cascade two birdcage coils or multiple birdcage coils in the longitudinal direction. For a single birdcage coil, D« 2L, forming a birdcage array coil, the signal-to-noise ratio is increased by 15~20% compared to a single birdcage coil of the same diameter and length.

[0006] 由于鸟笼线圈用作接收线圈吋可以产生非常均匀的图像质量，近年来，也有一些小尺寸的鸟笼线圈用于人体成像所用，比如用作头线圈或者膝盖线圈进行成像，也有一些小尺寸鸟笼线圈用于动物的扫描，包括猫狗、兔子、老鼠等。和专用的表面接收相比，鸟笼线圈虽然在并行成像方面没有优势，但可以取得比较均匀的图像质量，适用于对成像速度不太高的扫描情况。 [0006] Since birdcage coils are used as receiving coils, they can produce very uniform image quality. In recent years, there have also been some small-sized birdcage coils used for human body imaging, such as imaging for head coils or knee coils, and some. Small-sized birdcage coils are used for animal scanning, including cats, dogs, rabbits, and mice. Compared to dedicated surface reception, birdcage coils have no advantage in parallel imaging, but achieve a more uniform image quality for scanning situations where imaging speed is not too high.

[0007] 目前关于发射线圈和接收线圈的使用方案是，使用大的鸟笼线圈来激励被扫描体，而用信噪比较高的表面阵列线圈来接收图像，从而实现大的激励范围以及较高的接收图像质量。但是如果用大的鸟笼线圈（激励电压超过 600V) 去激励较小的被扫描体，比如人体头部，四肢（包括手腕，胳膊，膝盖，脚踝等），或者动物（比如猫狗、老鼠、兔子等），由于法规对射频吸收率 SAR(_Sp_ecific absorption rate)安全指标的限制，会造成发射能量无法有效传递给被扫描体，从而会造成发射效率的降低，会进一步影像扫描参数的优化，牺牲图像信噪比和分辨率。为此有人提出了采用局部的收发一体的射频线圈装置，即采用一个大小合适（根据扫描对象的尺寸而定）的鸟笼线圈作为发射层，内层采用相控阵表面射频线圈作为接收层，这样确实能够提高发射效率以及图像的接收信噪比，但同吋会带来线圈设计的复杂化，发射层和接收层存在的耦合难以根本消除等问题。 [0007] At present, the use scheme of the transmitting coil and the receiving coil is to use a large bird cage coil to excite the scanned object, and a surface array coil with a relatively high signal noise to receive the image, thereby realizing a large excitation range and comparison. High received image quality. However, if a large birdcage coil (excitation voltage exceeds 600V) is used to excite smaller scanned objects, such as the human head, limbs (including wrists, arms, knees, ankles, etc.), or animals (such as cats and dogs, mice, Rabbits, etc., because of the restrictions on the safety index of SAR ( _S p _ec ific absorption rate), the emission energy can not be effectively transmitted to the scanned object, which will cause the emission efficiency to decrease, and further the imaging parameters will be Optimized, sacrificing image signal-to-noise ratio and resolution. For this reason, it has been proposed to use a local RF transceiver device, that is, a bird cage coil of appropriate size (depending on the size of the scanning object) is used as the emission layer, and the inner layer adopts a phased array. The surface RF coil acts as a receiving layer, which can improve the transmission efficiency and the received signal-to-noise ratio of the image. However, the coil design is complicated, and the coupling between the emission layer and the receiving layer is difficult to eliminate.

[0008] 申请内容 [0008] Application Content

[0009] 本申请的目的在于克服现有技术之缺陷，提供了一种自发自收的鸟笼阵列线圈及其控制电路，其具有自发自收、区域选择可自由控制、结构简单的特性。 [0009] The purpose of the present application is to overcome the defects of the prior art, and provide a self-receiving bird cage array coil and a control circuit thereof, which have the characteristics of spontaneous self-receiving, freely controllable area selection, and simple structure.

[0010] 本申请是这样实现的：一种自发自收的鸟笼阵列线圈，其包括： [0010] The present application is implemented as follows: A self-receiving bird cage array coil, comprising:

[0011] 一第一端环，其上设置有多个第一端环电容； [0011] a first end ring, on which a plurality of first end ring capacitors are disposed;

[0012] 一第二端环，其上设置有多个第二端环电容，第二端环电容与第一端环电容数量相同，第二端环位于第一端环上部； [0012] a second end ring, wherein a plurality of second end ring capacitors are disposed, the second end ring capacitor is the same as the first end ring capacitor, and the second end ring is located at the upper portion of the first end ring;

[0013] 多个腿，每一条腿的下端与第一端环连接，形成第一连接点，任意相邻的两个第一连接点之间具有一个第一端环电容，每一条腿的上端与第二端环连接，并形成第二连接点，任意相邻的两个第二连接点之间具有一个第二端环电容； [0013] a plurality of legs, the lower end of each leg is connected to the first end ring to form a first connection point, and a first end ring capacitor is disposed between any adjacent two first connection points, and the upper end of each leg Connecting with the second end ring and forming a second connection point, and having a second end ring capacitance between any two adjacent second connection points;

[0014] 一环体，设置于所述第一端环和第二端环之间，所述环体与多个腿均相连，并形成第三连接点，所述第三连接点将腿分为第一连接段和第二连接段，第一连接段位于第二连接段下方，每一条腿的第一连接段上依序设置有第一电容、第一二极管，每一条腿的第二连接段上依序设置有第二电容、第二二极管，每一条腿上的第一二极管、第二二极管的方向相同，任意相邻的两个第一连接段上的第一二极管方向相反，任意相邻的两个第二连接段上的第二二极管方向相反，所述环体上设置有多个第三电容，所述环体上的任意相邻的两个第三连接点之间具有一个第三电容。 [0014] a ring body is disposed between the first end ring and the second end ring, the ring body is connected to the plurality of legs, and forms a third connection point, and the third connection point divides the leg The first connecting segment and the second connecting segment are located below the second connecting segment, and the first connecting portion of each leg is sequentially provided with a first capacitor and a first diode, and each leg is The second connecting segment is sequentially provided with a second capacitor and a second diode. The first diode and the second diode on each leg have the same direction, and are adjacent to any two adjacent first connecting segments. The first diodes are opposite in direction, and the second diodes on any two adjacent second connection segments are opposite in direction, and the ring body is provided with a plurality of third capacitors, any adjacent on the ring body There is a third capacitance between the two third connection points.

[0015] 进一步地，所述第一端环的直径 D1等于第二端环的直径 D2，第一连接段的长度 L1等于第二连接段的长度 L2。 [0015] Further, the diameter D1 of the first end ring is equal to the diameter D2 of the second end ring, and the length L1 of the first connecting segment is equal to the length L2 of the second connecting segment.

[0016] 进一步地，所述第一端环的直径 D1等于第二端环的直径 D2，第一连接段的长度 L1等于第二连接段的长度 L2，所述第一端环的直径 D1是第一连接段的长度 L1 数值的两倍。 [0016] Further, the diameter D1 of the first end ring is equal to the diameter D2 of the second end ring, the length L1 of the first connecting segment is equal to the length L2 of the second connecting segment, and the diameter D1 of the first end ring is The length of the first connecting segment is twice the value of L1.

[0017] 进一步地，所述第一连接段上的第一二极管上连接有直流控制信号 Td_l，所述第二连接段上的第二二极管上连接有直流控制信号 Td_2，直流控制信号 Td_l和直流控制信号 Td_2为同一信号源。 [0017] Further, a DC control signal Td_1 is connected to the first diode on the first connection segment, and a DC control signal Td_2 is connected to the second diode on the second connection segment. Signal Td_l and The DC control signal Td_2 is the same signal source.

[0018] 进一步地，所述第一连接段上的第一二极管上连接有直流控制信号 Td_l，所述第二连接段上的第二二极管上连接有直流控制信号 Td_2，直流控制信号 Td_l和直流控制信号 Td_2为相互独立的两个信号源。 [0018] Further, a DC control signal Td_1 is connected to the first diode on the first connection segment, and a DC control signal Td_2 is connected to the second diode on the second connection segment. The signal Td_l and the DC control signal Td_2 are two signal sources independent of each other.

[0019] 进一步地，第一端环电容的数量为八，这八个第一端环电容等分第一端环，第二端环电容的数量为八，这八个第二端环电容等分第二端环，第三电容的数量为八，这八个第三电容等分环体，腿的数量为八，以逆吋针定义， 0度、 45度、 90度、 135度、 180度、 225度、 270度、 315度角上分别设置一个腿，其中角度相差 90度上的两个腿的相位相差 90度。 [0019] Further, the number of the first end ring capacitors is eight, the eight first end ring capacitors are equally divided into the first end rings, and the number of the second end ring capacitors is eight, and the eight second end ring capacitors, etc. Divided into the second end ring, the number of the third capacitor is eight, the eight third capacitors are equally divided into rings, the number of legs is eight, defined by the reverse pin, 0 degrees, 45 degrees, 90 degrees, 135 degrees, 180 One leg is set at an angle of 225 degrees, 270 degrees, and 315 degrees, and the phases of the two legs at an angle of 90 degrees differ by 90 degrees.

[0020] 一种自发自收的鸟笼阵列线圈的控制电路，其包括一来自谱仪的射频信号源，射频信号源的输出端连接至一射频功放的输入端，射频功放的输出端连接至一正交功率分配器的输入端，正交功率分配器的两个输出端分别连接至正交功率分配器的输入端、正交功率分配器的输入端，正交功率分配器具有两个输出端，正交功率分配器的每一所述输出端均依序连接 II路发射控制电路、 90度移相器、 II路隔离控制电路、 90度移相器、 II路接收控制电路、前置放大器，前置放大器输出信号， II路接收控制电路连接 II路收发控制信号；正交功率分配器具有两个输出端，正交功率分配器的每一所述输出端均依序连接 Q1路发射控制电路、 9 0度移相器、 Q1路隔离控制电路、 90度移相器、 Q1路接收控制电路、前置放大器，前置放大器输出信号， Q1路接收控制电路连接 Q1路收发控制信号。 [0020] A self-receiving bird cage array coil control circuit, comprising a radio frequency signal source from a spectrometer, the output end of the radio frequency signal source is connected to an input end of an RF power amplifier, and the output end of the RF power amplifier is connected to An input of a quadrature power splitter having two outputs connected to an input of a quadrature power splitter, an input of a quadrature power splitter, and a quadrature power splitter having two outputs End, each of the output terminals of the orthogonal power splitter is sequentially connected with a II channel transmission control circuit, a 90 degree phase shifter, a II channel isolation control circuit, a 90 degree phase shifter, a II channel receiving control circuit, and a front end. The amplifier, the preamplifier output signal, the II channel receiving control circuit is connected to the II channel transceiver control signal; the quadrature power divider has two output terminals, and each of the output terminals of the orthogonal power divider is sequentially connected to the Q1 channel transmission Control circuit, 90 degree phase shifter, Q1 way isolation control circuit, 90 degree phase shifter, Q1 way receiving control circuit, preamplifier, preamplifier output signal, Q1 way The receiving control circuit is connected to the Q1 way to send and receive control signals.

[0021] 本申请多个鸟笼线圈组成的线圈阵列既用于发射，又用于接收，来实现鸟笼阵列线圈激励被扫描体吋同吋发射，但接收信号的吋按照感兴趣区域来切换选择线圈，既解决了单个鸟笼射频线圈信噪比不高的问题，又解决了发射线圈和接收线圈之间的耦合干扰问题。采用这种鸟笼线圈阵列，可以解决目前在人体四肢扫描或者动物扫描的情况下射频功率过高，或者目前局部收发双层线圈存在的收发两层线圈所造成的设计复杂以及收发层耦合的问题。 [0021] The coil array composed of a plurality of birdcage coils of the present application is used for both transmission and reception, so that the bird cage array coil excitation is transmitted by the scanning body, but the received signal is switched according to the region of interest. Selecting the coil not only solves the problem that the signal-to-noise ratio of the single birdcage RF coil is not high, but also solves the problem of coupling interference between the transmitting coil and the receiving coil. The bird cage coil array can solve the problem of high design of the radio frequency power in the case of human body limb scanning or animal scanning, or the current design and transmission of two layers of coils in the local transceiving double coil, and the coupling of the transceiver layer. .

[0022] 附图说明 BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。 [0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings to be used in the embodiments or the prior art description will be briefly described below, and obviously, in the following description The drawings are only some of the embodiments of the present application, and other drawings may be obtained from those skilled in the art without departing from the drawings.

[0024] 图 1为本申请实施例提供的第一实施例的示意图； 1 is a schematic diagram of a first embodiment provided by an embodiment of the present application;

[0025] 图 2为本申请实施例提供的第二实施例的示意图； 2 is a schematic diagram of a second embodiment provided by an embodiment of the present application;

[0026] 图 3为本申请实施例提供的控制电路部分的框图； 3 is a block diagram of a control circuit portion provided by an embodiment of the present application;

[0027] 图 4为本申请实施例提供的控制电路部分的原理图； [0027] FIG. 4 is a schematic diagram of a portion of a control circuit provided by an embodiment of the present application;

[0028] 图 5为本申请实施例提供的正交功率分配器的特征图； 5 is a characteristic diagram of a quadrature power splitter according to an embodiment of the present application;

[0029] 图 6为本申请实施例提供的两个鸟笼线圈的谐振控制电路的平面展幵图。 6 is a plan view showing a resonance control circuit of two bird cage coils according to an embodiment of the present application.

[0030] 具体实施方式 DETAILED DESCRIPTION

[0031] 下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。 The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present application. It is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. example. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the scope of the invention are within the scope of the present invention.

[0032] 如图 1至图 6，本申请实施例提供一种自发自收的鸟笼阵列线圈及其控制电路，具体请参见以下详细叙述。 1 to FIG. 6, the embodiment of the present application provides a self-receiving bird cage array coil and a control circuit thereof. For details, refer to the following detailed description.

[0033] 以实施例二进行简单说明，一种自发自收的鸟笼阵列线圈，其包括：一第一端环 11，即图 2中下面一个端环，其上设置有多个第一端环电容 111 ; 一第二端环 2 1，即图 2中上面一个端环，其上设置有多个第二端环电容 211，第二端环电容 21 1与第一端环电容 _{U 1}数量相同，第二端环 21位于第一端环 11上部；多个腿 4 (图 2中上下方向设置，位于第一端环 11和第二端环 21之间），每一条腿 4的下端与第一端环 11连接，形成第一连接点 112，任意相邻的两个第一连接点 112之间具有一个第一端环电容 111，每一条腿 4的上端与第二端环 21连接，并形成第二连接点 212，任意相邻的两个第二连接点 212之间具有一个第二端环电容 211。 [0033] Briefly described in the second embodiment, a self-receiving bird cage array coil includes: a first end ring 11, that is, a lower end ring in FIG. 2, on which a plurality of first ends are disposed The ring capacitor 111; a second end ring 2 1, that is, the upper end ring in FIG. 2, on which a plurality of second end ring capacitors 211, a second end ring capacitor 21 1 and a first end ring capacitor _{U 1} are disposed. Similarly, the second end ring 21 is located at the upper portion of the first end ring 11; a plurality of legs 4 (located in the up and down direction in FIG. 2 between the first end ring 11 and the second end ring 21), the lower end of each leg 4 and The first end ring 11 is connected to form a first connection point 112. A first end ring capacitor 111 is disposed between any two adjacent first connection points 112. The upper end of each leg 4 is connected to the second end ring 21, And forming a second connection point 212, and having a second end ring capacitor 211 between any two adjacent second connection points 212.

[0034] 至少一环体 31，即中间一个环，设置于所述第一端环 11和第二端环 21之间，所述环体 31与多个腿 4均相连，并形成第三连接点 312，所述第三连接点 312将腿 4 分为第一连接段 41和第二连接段 42，第一连接段 41位于第二连接段 42下方，每一条腿 4的第一连接段 41上依序设置有第一电容（Cl_l、 Cl_2、 Cl_3、 Cl_4、 C 1—5、 Cl_6、 Cl_7、 Cl_8) 、第一二极管（Dl_l、 Dl_2、 Dl_3、 Dl_4、 Dl_5 、 Dl_6、 Dl_7、 Dl_8) ，每一条腿 4的第二连接段 42上依序设置有第二电容（C 2_1、 C2_2、 C2_3、 C2_4、 C2_5、 C2_6、 C2_7、 C2_8) 、第二二极管（D2_l、 D2_2、 D2_3、 D2_4、 D2_5、 D2_6、 D2_7、 D2_8) ，每一条腿 4上的第一二极管、第二二极管的方向相同（例如， Dl_l对应的 D2_l，只要是同一条腿上的两个二极管，它们的方向相同），任意相邻的两个第一连接段 41上的第一二极管方向相反（例如， Dl_l和 Dl_2的方向反向，其它就不累赘叙述），任意相邻的两个第二连接段 42上的第二二极管方向相反（例如， D2_l和 D2_2的方向反向，其它就不累赘叙述），所述环体 31上设置有多个第三电容 311，所述环体 31上的任意相邻的两个第三连接点 312之间具有一个第三电容 311。 [0034] At least one ring body 31, that is, a middle ring, is disposed between the first end ring 11 and the second end ring 21, and the ring body 31 is connected to the plurality of legs 4 and forms a third connection. Point 312, the third connection point 312 divides the leg 4 into a first connecting section 41 and a second connecting section 42, the first connecting section 41 is located below the second connecting section 42, the first connecting section 41 of each leg 4 The first capacitor (Cl_l, Cl_2, Cl_3, Cl_4, C1-5, Cl_6, Cl_7, Cl_8) and the first diode (Dl_l, Dl_2, Dl_3, Dl_4, Dl_5) are sequentially disposed. , Dl_6, Dl_7, Dl_8), the second connection segment 42 of each leg 4 is sequentially provided with a second capacitor (C 2_1, C2_2, C2_3, C2_4, C2_5, C2_6, C2_7, C2_8), the second diode (D2_l, D2_2, D2_3, D2_4, D2_5, D2_6, D2_7, D2_8), the direction of the first diode and the second diode on each leg 4 is the same (for example, D2_l corresponding to Dl_l, as long as it is the same The two diodes on the leg have the same direction. The first diodes on any two adjacent first connecting segments 41 are opposite in direction (for example, the directions of Dl_l and Dl_2 are reversed, and the others are not cumbersome) The second diodes on any two adjacent second connecting segments 42 are opposite in direction (for example, the directions of D2_1 and D2_2 are reversed, and the others are not cumbersome), and the ring body 31 is provided with a plurality of The third capacitor 311 has a third capacitor 311 between any two adjacent third connection points 312 on the ring body 31.

[0035] 进一步地，所述第一端环 11的直径 D1等于第二端环 21的直径 D2，第一连接段 4 1的长度 L1等于第二连接段 42的长度 L2。另一设计也可以是所述第一端环 11的直径 D1等于第二端环 21的直径 D2，第一连接段 41的长度 L1等于第二连接段 42的长度 L2，所述第一端环 11的直径 D1是第一连接段 41的长度 L1数值的两倍。所述第一连接段上的第一二极管上连接有直流控制信号 Td_l，所述第二连接段上的第二二极管上连接有直流控制信号 Td_2，直流控制信号 Td_l和直流控制信号 Td_2 为同一信号源。另一设计也可以是所述第一连接段上的第一二极管上连接有直流控制信号 Td_l，所述第二连接段上的第二二极管上连接有直流控制信号 Td_2 ，直流控制信号 Td_l和直流控制信号 Td_2为相互独立的两个信号源。 [0035] Further, the diameter D1 of the first end ring 11 is equal to the diameter D2 of the second end ring 21, and the length L1 of the first connecting segment 4 is equal to the length L2 of the second connecting segment 42. Another design may also be that the diameter D1 of the first end ring 11 is equal to the diameter D2 of the second end ring 21, and the length L1 of the first connecting section 41 is equal to the length L2 of the second connecting section 42, the first end ring The diameter D1 of 11 is twice the value of the length L1 of the first connecting section 41. a DC control signal Td_1 is connected to the first diode on the first connection segment, and a DC control signal Td_2, a DC control signal Td_l and a DC control signal are connected to the second diode on the second connection segment. Td_2 is the same source. Another design may be that a DC control signal Td_1 is connected to the first diode on the first connection segment, and a DC control signal Td_2 is connected to the second diode on the second connection segment. The signal Td_l and the DC control signal Td_2 are two signal sources independent of each other.

[0036] 在本设计中，第一端环电容 111的数量为八，这八个第一端环电容 111等分第一端环 11，第二端环电容 211的数量为八，这八个第二端环电容 211等分第二端环 2 1，第三电容 311的数量为八，这八个第三电容 311等分环体 31，腿 4的数量为八，以逆吋针定义， 0度、 45度、 90度、 135度、 180度、 225度、 270度、 315度、 3 15度角上分别设置一个腿 4，其中角度相差 90度上的两个腿 4的相位相差 90度，在图 2中。最左侧为 0度位置， 0度位置上有一个腿 4，逆吋针观察， 45度、 90度、 135度、 180度、 225度、 270度、 315度、 315度角上分别设置一个腿 4，一共有 8个腿 4，其中第一电容（_Cl_l、 Cl_3) 的两端分别设置有一个巴伦馈电，第二电容（C2_l、 C2_3) 的两端分别设置有一个巴伦馈电。 [0036] In the present design, the number of the first end ring capacitors 111 is eight, the eight first end ring capacitors 111 are equally divided into the first end rings 11, and the number of the second end ring capacitors 211 is eight. The second end ring capacitor 211 is equally divided into the second end ring 2 1. The number of the third capacitors 311 is eight. The eight third capacitors 311 are equally divided into the ring bodies 31, and the number of the legs 4 is eight, which is defined by the reverse pin. One leg 4 is respectively set at 0, 45, 90, 135, 180, 225, 270, 315, and 3 15 degrees, wherein the phases of the two legs 4 differ by 90 degrees from each other by 90 degrees. Degree, in Figure 2. The leftmost side is 0 degree position, and the 0 degree position has a leg 4, which is set by the reverse tweezer, 45 degrees, 90 degrees, 135 degrees, 180 degrees, 225 degrees, 270 degrees, 315 degrees, and 315 degrees. There are 8 legs 4 in the leg 4, wherein the first capacitors ( _C l_l, Cl_3) are respectively provided with a balun feed, and the second capacitors (C2_l, C2_3) are respectively provided with a balun feed. Electricity.

[0037] 图一描述了 2个 8条腿的鸟笼阵列线圈采用互相重叠（overlapping) 的方式来去除磁场耦合的结构,这种结构以前常用于表面线圈的去耦方式中，现在幵始用于鸟笼阵列线圈的去耦设计。 [0037] Figure 1 depicts two 8-legged birdcage array coils that are overlapped to each other. In addition to magnetic field coupled structures, which were previously used in the decoupling of surface coils, are now being used for decoupling designs for bird cage array coils.

[0038] 图二描述了两个 8条腿 4 (本文中把垂直于第一端环 11、第二端环 21的 8个平行的铜皮或者铜棍称之为鸟笼线圈的腿）的鸟笼天线阵列，为了方便，两个鸟笼线圈都以 8条腿为例进行说明，实际上腿的数量可以扩展成为 12、 16等，在实际设计中，可根据磁场均匀性要求来设计腿的数目，两个鸟笼线圈采用了环体 31 上面的电容来去除相邻线圈磁场耦合的设计，通过环体 31 (也成为公用端环）组成了一个 1乘 2的天线阵列。 [0038] FIG. 2 depicts two eight legs 4 (herein eight parallel copper or copper bars perpendicular to the first end ring 11 and the second end ring 21 are referred to as legs of a birdcage coil). Birdcage antenna array, for convenience, the two birdcage coils are illustrated by taking 8 legs as an example. In fact, the number of legs can be expanded to 12, 16, etc. In actual design, the legs can be designed according to the requirements of magnetic field uniformity. The number of the two birdcage coils uses the capacitance above the ring 31 to remove the magnetic coupling of the adjacent coils. The ring body 31 (also known as the common end ring) constitutes a 1 by 2 antenna array.

[0039] 为了实现整个鸟笼线圈阵列接收场和发射场的均匀性，本申请要求图一和图二中的两个鸟笼线圈单元的尺寸相等，也就是说 D1=D2， L1=L2; Dl， D2分别为两个鸟笼线圈单元各自的直径尺寸， Ll， L2分别为两个鸟笼线圈单元的长度尺寸。 [0039] In order to achieve uniformity of the receiving field and the transmitting field of the entire bird cage coil array, the present application requires that the two bird cage coil units in FIG. 1 and FIG. 2 are equal in size, that is, D1=D2, L1=L2; Dl, D2 are the respective diameter sizes of the two birdcage coil units, and Ll, L2 are the length dimensions of the two birdcage coil units, respectively.

[0040] 无论图一的采用互相重叠面积去耦合的两个鸟笼线圈阵列结构，还是图二的采用公共端环电容来去耦合的两个鸟笼线圈阵列，都可以达到两个鸟笼线圈去耦合的目的，下面的线圈馈电方案和功率分配以及控制电路都适用于图一和图二的结构。 [0040] Regardless of the two birdcage coil array structures decoupled by overlapping areas of FIG. 1, or the two birdcage coil arrays decoupled by the common terminal ring capacitor of FIG. 2, two birdcage coils can be achieved. For the purpose of decoupling, the following coil feeding scheme and power distribution and control circuits are applicable to the structures of Figures 1 and 2.

[0041] 以图二为例，选择两个鸟笼线圈的正交腿位置上面进行信号的馈电，比如从线圈 1 (下面一个线圈）上 0度角位置腿上面的电容即 Cl_l两端和 90度位置腿上面的电容即 Cl_3两端两个位置各自经过一个巴伦馈电；线圈 1每条腿上都有一个二极管来控制线圈的谐振和断幵，为 Dl_l， Dl_2, ...... Dl_8，同吋一起由一个直流控制信号 Td_l来控制。对于线圈 2，同样的，从 0度腿角位置腿上面的。2_1和90 度位置腿上面的电容 C2_3两个电容两端两个位置经过各自一个巴伦来馈电。每个馈电口加了巴伦是为了抑制信号的共模干扰以及消除线圈发射能量吋同轴线屏蔽层上的电流的热效应。线圈 2每条腿上面控制线圈谐振和断幵的二极管为 D2 _1， D2_2, ...... D2_8，同吋一起由直流控制信号 Td_2来控制。 Td_l和 Td_2可以分别单独控制线圈 1和 2的谐振或者断幵。相对于传统的单个鸟笼线圈而言，采用两个或多个鸟笼线圈可以在图像信噪比不下降的前提下，有效地扩展成像视野 FOV (field of view) ，可以得到较大范围内的非常均匀的图像质量。 [0042] 图三描述了双路功率分配电路以及双路收发切换电路的方案。这个方案包含了谱仪的射频信号源、对于射频功放的控制信号、射频功放、一个一分二，二分四的发射电路，其中一分二的发射电路由一个小功率的射频功率放大器和功率分配器 1完成，经过功率分配器 1，即可产生两路信号强度相等，但相位差 90度的两路正交信号 II和 Ql。二分四的电路设计如下，以 II路为例， II路的发射电路由功率分配器 2以及 II路发射控制电路组成，其中经过功率分配器 2后， II路信号被同样分成两个信号强度相等，但相位相差 90度的 Il_i和 Il_q信号； II路的收发隔离电路由两对级联的 90度移相器和二者之间的 II路隔离控制电路组成； II路的接收信号放大电路由 II路接收控制电路和两个支路 Il_i、 Il_q的前置放大器电路组成。经过放大以后，形成两个正交信号 RF1_0和 RF_90,进入到射频通道选择器，最后经过通道选择以后，进入谱仪进行数字化处理。 [0041] Taking FIG. 2 as an example, the signal feeding is performed on the orthogonal leg positions of the two birdcage coils, for example, from the coil 1 (lower coil), the capacitor above the leg, that is, the Cl_l end, The capacitance above the leg at 90 degrees, that is, the two positions at both ends of Cl_3, is respectively fed through a balun; the coil 1 has a diode on each leg to control the resonance and break of the coil, which is Dl_l, Dl_2, .... .. Dl_8, together with a dc control signal Td_l. For coil 2, the same, from the 0 degree leg angle position above the leg. Capacitors above the 2_1 and 90 degree positions C2_3 Two positions at both ends of the two capacitors are fed through a respective balun. The balun is added to each feed port to suppress the common mode interference of the signal and to eliminate the thermal effect of the current emitted by the coil on the coaxial shield. The diodes on each leg of the coil 2 that control coil resonance and break are D2_1, D2_2, ... D2_8, which are controlled by the DC control signal Td_2. Td_l and Td_2 can individually control the resonance or break of the coils 1 and 2, respectively. Compared with the traditional single birdcage coil, two or more birdcage coils can effectively expand the FOV (field of view) without reducing the image signal-to-noise ratio, which can be obtained in a larger range. Very uniform image quality. [0042] FIG. 3 depicts a scheme of a dual power distribution circuit and a dual transmit and receive switching circuit. This solution includes the RF signal source of the spectrometer, the control signal for the RF power amplifier, the RF power amplifier, a one-two, two-fourth transmission circuit, one of the two transmission circuits consists of a low-power RF power amplifier and power distribution. After the completion of the device 1, the power splitter 1 can generate two orthogonal signals II and Q1 with equal signal strengths but 90 degrees out of phase. The circuit design of two-fourth is as follows. Taking the II road as an example, the transmission circuit of the II road is composed of the power splitter 2 and the II-channel launch control circuit. After passing through the power splitter 2, the II signal is equally divided into two signal strengths. , but the phase difference is 90 degrees of Il_i and Il_q signals; the II channel transceiver isolation circuit consists of two pairs of cascaded 90 degree phase shifters and the II way isolation control circuit between them; the II road receiving signal amplification circuit consists of The II way receiving control circuit and the preamplifier circuit of the two branches Il_i, Il_q are composed. After amplification, two orthogonal signals RF1_0 and RF_90 are formed, enter the RF channel selector, and finally, after channel selection, enter the spectrometer for digitization.

[0043] 11」和11_9信号既连接后面的 90度移相器，同吋连接鸟笼线圈 1的两个正交馈电端口即 Cl_l和 Cl_3两个端口。 [0043] The 11" and 11_9 signals are connected to both the rear 90 degree phase shifter, and the two orthogonal feed ports of the birdcage coil 1 are connected to the two ports of Cl_l and Cl_3.

[0044] 其中，对于 II路发射控制电路， II路隔离控制电路， II路接收控制电路三个电路都由 II路的直流信号 Tr_Il同吋控制，直流信号 Tr_Il分别有正和负两种电压两个状态，分别实现 II路发射和接收两种不同状态的控制。 [0044] wherein, for the II channel emission control circuit, the II channel isolation control circuit, and the II channel reception control circuit, the three circuits are controlled by the DC signal Tr_I1 of the II channel, and the DC signal Tr_Il has two voltages, positive and negative, respectively. State, respectively, to achieve the control of two different states of the II channel transmission and reception.

[0045] 图四阐述了两个鸟笼线圈的功率分配和控制电路的具体实施方案。图五阐述了图四中的正交功率分配器的特征说明，具体实施电路，不少文献中已经有说明，此处不做赘述。 [0045] FIG. 4 illustrates a specific implementation of a power distribution and control circuit for two birdcage coils. Figure 5 illustrates the characteristics of the orthogonal power splitter in Figure 4. The specific implementation circuit has been described in many documents and will not be described here.

[0046] 在图四中以 II路为例，其中发射控制幵关有两个大功率幵关二极管 D3， D4构成，能够在高频情况下承受高电压和高电流，并且能够足够快的实现幵关切换 [0046] In FIG. 4, the II road is taken as an example, wherein the emission control is composed of two high-power switching diodes D3 and D4, which can withstand high voltage and high current at high frequency, and can be realized fast enough. Switch

[0047] 90°移相器由两个相等容值的电容 C1和一个电感 L1构成，这是一个典型的 π型移相器结构，能够实现当发射信号吋，一端短路，另一端就会呈现近似于幵路的高阻抗特征，可以用作收发隔离。 [0047] The 90° phase shifter consists of two capacitors C1 of equal capacitance and an inductor L1. This is a typical π-type phase shifter structure. When the signal is transmitted, one end is short-circuited and the other end is presented. A high-impedance feature that approximates the loop and can be used as a transceiver isolation.

[0048] 采用两个 90°的移相器既可以保证接收信号，在接收回路上与没有移相器情况下的阻抗相同，即不影响接收回路的阻抗特征，同吋当发射吋一端通过二极管短路实现阻抗接地，在另一端可以实现幵路特征，即实现与发射电路的隔离，两个级联的 90°移相器可以实现两级的隔离效果，保证了大功率信号与接收电路之间足够的隔离度。 [0048] The two 90° phase shifters can ensure the received signal, and the impedance in the receiving loop is the same as that without the phase shifter, that is, the impedance characteristic of the receiving loop is not affected, and the transmitting end passes through the diode. Short circuit realizes impedance grounding, and the other end can realize the circuit characteristic, that is, realize isolation from the transmitting circuit. Two cascaded 90° phase shifters provide two levels of isolation, ensuring adequate isolation between the high power signal and the receiving circuit.

[0049] 图四中的 L_f电感为大电感值电感，通常为微亨级以上，即对于射频工作频率上呈现出高阻抗，实现高频信号的阻隔，同吋对于直流或者低频信号基本没有影响； C_f为大容值电容，通常为纳法级以上，即可实现对于高频的射频工作频率短路，高频信号通过基本没有影响，同吋对于直流或者低频信号呈现断幵或者高阻状态， L_f和 C_f组合在一起使用，可以构成一个近似于低通滤波器的效果，即通直流，断幵高频信号。 [0049] The L_f inductor in FIG. 4 is a large inductance value inductor, which is usually above the micro-henry level, that is, exhibits high impedance for the RF operating frequency, and achieves high-frequency signal blocking, and has no effect on DC or low-frequency signals. C_f is a large capacitance, usually above the nano-level, which can achieve short-circuit to the high-frequency RF operating frequency. The high-frequency signal has no effect at all, and the DC or low-frequency signal is broken or high-resistance. The combination of L_f and C_f can form an effect similar to a low-pass filter, that is, through DC, breaking high-frequency signals.

[0050] 当收发控制信号 Tr_Il为负电压吋，电流可以串联通过 D1~D6等 6只二极管，实现对于正交两路信号的发射电路的幵通和与接收电路的隔离。 [0050] When the transceiving control signal Tr_I1 is a negative voltage 吋, the current can be connected in series through 6 diodes such as D1 to D6 to achieve the isolation of the transmitting circuit of the orthogonal two signals and the isolation from the receiving circuit.

[0051] 当收发控制信号 Tr_Il为正电压吋， D1~D6等二极管断幵， D7导通，此吋正电压会施加在 II路上的两路接收信号的放大器上，使得放大器正常放大信号，实现正常接收。 [0051] When the transceiving control signal Tr_Il is a positive voltage 吋, a diode such as D1~D6 is turned off, and D7 is turned on, and the positive voltage is applied to the amplifier of the two receiving signals on the II road, so that the amplifier normally amplifies the signal, and realizes Normal reception.

[0052] 类似的， Q1路的电路设计和 II的电路相对应，这里不做赘述。 [0052] Similarly, the circuit design of the Q1 circuit corresponds to the circuit of the II, and will not be described here.

[0053] II路和 Q1路的直流信号 Tr_Il和 Tr_Ql是独立的两个信号但可以同步控制。也就是可以控制 II路和 Q1路同步处于发射或者接收状态中。对于本例中的两个线圈阵列的情况下，可以实现鸟笼线圈 BC1和 BC2同吋发射激励被扫描体，发射后 B C1和 BC2可以同吋幵始接收（当被扫描体较大，两个线圈都覆盖到了）。 [0053] The DC signals Tr_I1 and Tr_Q1 of the II and Q1 are independent signals but can be controlled synchronously. In other words, it is possible to control the synchronization of the II channel and the Q1 channel in the transmitting or receiving state. For the case of the two coil arrays in this example, the bird cage coils BC1 and BC2 can be excited to emit the excited body, and the B C1 and BC2 can be received simultaneously after the launch (when the scanned body is larger, two The coils are covered.)

[0054] BC1和 BC2的直流控制信号 Td_l和 Td_2是独立的，既可以同步也可以异步，当 ***处于接收状态吋，可以实现 BC1接收（当被扫描***于 BC1的覆盖范围内）， BC2断幵；或者 BC1断幵， BC2接收（当被扫描***于 BC2的覆盖范围内），当然也可以 BC1和 BC2同吋接收，这个要取决于被扫描体的大小，具体是由哪一个覆盖或者两个线圈都覆盖到了，这样可以避免非感兴趣区域的噪声耦合进入到感兴趣区域而引起信噪比的下降。 [0054] The DC control signals Td_1 and Td_2 of BC1 and BC2 are independent, and can be synchronous or asynchronous. When the system is in the receiving state, BC1 can be received (when the scanned object is within the coverage of BC1), BC2 is off.或者; or BC1 is broken, BC2 is received (when the scanned object is within the coverage of BC2), of course, it can also be received by BC1 and BC2, depending on the size of the scanned object, which one is covered or two The coils are covered, which avoids the noise coupling of the non-interest area into the region of interest and causes a decrease in the signal-to-noise ratio.

[0055] 图六将鸟笼线圈进行展幵的平面视图，阐述了两个鸟笼线圈的谐振控制方案。 [0055] FIG. 6 is a plan view showing the coil of the bird cage, illustrating the resonance control scheme of the two bird cage coils.

在图六中，所有的幵关二极管为大功率二极管，并且能够快速的进行幵关切换 In Figure 6, all of the switching diodes are high-power diodes, and can be quickly switched.

[0056] 以鸟笼 2号线圈为例，所有的二极管均采用相邻方向相反的方式放置，目的是使得整个直流回路在鸟笼的圆周上呈现去的电流和回来的电流一正一反分布，这样可以互相抵消由于直流电路存在而带来的磁场影响。从而使直流回路对发射线圈的工作磁场的影响最小。 [0056] Taking the bird cage No. 2 coil as an example, all the diodes are placed in opposite directions, the purpose is The current flowing from the entire DC loop on the circumference of the bird cage is positively and inversely distributed, so that the magnetic field effects due to the presence of the DC circuit can be canceled each other. Thereby the DC loop has minimal effect on the working magnetic field of the transmitting coil.

[0057] 同样的，在直流电路 Td_2的入口处，采用 L_f和 C_f¾成的滤波电路，可以保证直流电路的纯净度以及上面没有其他高频干扰信号的存在。 [0057] Similarly, at the entrance of the DC circuit Td_2, a filter circuit formed by L_f and C_f3⁄4 can ensure the purity of the DC circuit and the absence of other high-frequency interference signals.

[0058] 在每两条腿之间的直流回路上，都放置 TL_f,用作对高频信号的扼流，避免整个圆周上面存在高频干扰信号，从而对正常的发射线圈电磁场造成干扰。 [0058] On the DC link between each leg, TL_f is placed for turbulence of the high-frequency signal to avoid high-frequency interference signals on the entire circumference, thereby causing interference to the electromagnetic field of the normal transmitting coil.

[0059] Td_2采用正的电压控制，当 Td_2上面施加正电压吋，所有的二极管串联导通，从而使得鸟笼线圈的每条腿电气连通，从而产生工作频率上的谐振，从而产生能够所需的均匀的射频场。 [0059] Td_2 uses positive voltage control. When a positive voltage is applied to Td_2, all the diodes are turned on in series, so that each leg of the birdcage coil is electrically connected, thereby generating resonance at the operating frequency, thereby generating the required Uniform RF field.

[0060] 二极管在纵向上需要尽量靠近中间的电容位置放置，从而能够当其他的接收线圈工作是，鸟笼线圈能够充分失谐，由于鸟笼线圈阵列的采用已经使得腿的长度减半（相比于同样直径的单个常规鸟笼线圈），所以每条腿上即使放置一个二极管，也可以实现充分的断幵和线圈失谐效果。 [0060] The diode needs to be placed as close as possible to the intermediate capacitor position in the longitudinal direction, so that when the other receiving coils are operated, the bird cage coil can be fully detuned, and the length of the leg has been halved due to the adoption of the bird cage coil array (phase Compared to a single conventional birdcage coil of the same diameter, so even if one diode is placed on each leg, sufficient breaking and coil detuning effects can be achieved.

[0061] Td_2可以设计有多个电压状态，高电压，低电压，负电压。作用为当鸟笼线圈进行发射吋，采用高电压可以保证二极管在强射频电磁场环境下的稳定导通，使得线圈稳定工作。当鸟笼线圈用作接收线圈吋，此吋无强射频电磁场环境，采用一个相对的低电压，即能够导通所有二极管，从而线圈也可以稳定工作。如果有另外一个小型的本地收发线圈存在吋，当这个小的线圈在发射吋，会导致鸟笼阵列线圈上面存在耦合电流，此吋采用一个负电压，能够使鸟笼线圈上面的二极管稳定不导通，从而保持线圈的绝对失谐状态，避免了与本地发射线圈的相互耦合。 [0061] Td_2 can be designed with multiple voltage states, high voltage, low voltage, and negative voltage. The function is to use the high voltage to ensure the stable conduction of the diode in the strong RF electromagnetic field environment when the bird cage coil is launched, so that the coil works stably. When the birdcage coil is used as a receiving coil, this 吋 does not have a strong RF electromagnetic field environment, and uses a relatively low voltage, that is, it can turn on all the diodes, so that the coil can also work stably. If there is another small local transceiver coil, when this small coil is launched, it will cause a coupling current on the bird cage array coil. This 吋 uses a negative voltage to stabilize the diode above the bird cage coil. Passing, thereby maintaining the absolute detuning state of the coil, avoiding mutual coupling with the local transmitting coil.

[0062] Td_l,Td_2以及 Tr_Il,Tr_Ql都来自于射频通道选择和控制器，通过谱仪来控制 [0062] Td_l, Td_2 and Tr_Il, Tr_Ql are all derived from the RF channel selection and controller, controlled by the spectrometer

[0063] 图一和图二的线圈设计以及对应的图三功率分配和收发控制电路也可以由 2个线圈 /2路扩展到 4个线圈 /4路或者更多 2n (n=l,2,3...)，原理同上，不再赘述。 [0063] The coil design of FIG. 1 and FIG. 2 and the corresponding power distribution and transceiving control circuit of FIG. 3 may also be extended from 2 coils/2 channels to 4 coils/4 channels or more 2n (n=l, 2, 3...), the principle is the same as above, no longer repeat them.

[0064] 图一和图二的线圈设计适用于单个鸟笼线圈直径和长度相当的情况（即 D«L) ，也适用于单个鸟笼线圈直径是长度尺寸两倍的情况，即 D«2L，这种情况下，会比前一种情况线圈中心信噪比高 15%~20<¾，属于优先采用的设计。 [0064] The coil design of Figures 1 and 2 is suitable for the case where the diameter and length of a single bird cage coil are equivalent (ie D«L), and also applies to the case where the diameter of a single bird cage coil is twice the length dimension, ie D«2L , In this situation, It will be 15%~20<3⁄4 higher than the center of the coil in the former case, which is a preferred design.

以上所述仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。 The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application are included in the present application. Within the scope of protection.

Claims

权利要求书 Claim

[权利要求 1] 一种自发自收的鸟笼阵列线圈，其特征在于，包括： [Claim 1] A self-receiving bird cage array coil, comprising:

一第一端环，其上设置有多个第一端环电容； a first end ring having a plurality of first end ring capacitors disposed thereon;

一第二端环，其上设置有多个第二端环电容，第二端环电容与第一端环电容数量相同，第二端环位于第一端环上部；多个腿，每一条腿的下端与第一端环连接，形成第一连接点，任意相邻的两个第一连接点之间具有一个第一端环电容，每一条腿的上端与第二端环连接，并形成第二连接点，任意相邻的两个第二连接点之间具有一个第二端环电容； a second end ring is provided with a plurality of second end ring capacitors, the second end ring capacitor is the same as the first end ring capacitor, and the second end ring is located at the upper end of the first end ring; a plurality of legs, each leg The lower end is connected to the first end ring to form a first connection point, and a first end ring capacitor is connected between any two adjacent first connection points, and the upper end of each leg is connected with the second end ring, and forms a first a second connection point, and a second end ring capacitor between any two adjacent second connection points;

一环体，设置于所述第一端环和第二端环之间，所述环体与多个腿均相连，并形成第三连接点，所述第三连接点将腿分为第一连接段和第二连接段，第一连接段位于第二连接段下方，每一条腿的第一连接段上依序设置有第一电容、第一二极管，每一条腿的第二连接段上依序设置有第二电容、第二二极管，每一条腿上的第一二极管、第二二极管的方向相同，任意相邻的两个第一连接段上的第一二极管方向相反，任意相邻的两个第二连接段上的第二二极管方向相反，所述环体上设置有多个第三电容，所述环体上的任意相邻的两个第三连接点之间具有一个第三电容。 a ring body disposed between the first end ring and the second end ring, the ring body is connected to the plurality of legs, and forms a third connection point, wherein the third connection point divides the leg into the first a connecting portion and a second connecting portion, the first connecting portion is located below the second connecting portion, and the first connecting portion of each leg is sequentially provided with a first capacitor, a first diode, and a second connecting portion of each leg The second capacitor and the second diode are sequentially disposed, and the first diode and the second diode on each leg have the same direction, and the first two of the adjacent two first connection segments are The direction of the pole tube is opposite, the second diodes on any two adjacent second connecting segments are opposite in direction, and the ring body is provided with a plurality of third capacitors, and any two adjacent ones on the ring body There is a third capacitance between the third connection points.

[权利要求 2] 如权利要求 1所述的一种自发自收的鸟笼阵列线圈，其特征在于：所述第一端环的直径 D1等于第二端环的直径 D2，第一连接段的长度 L1 等于第二连接段的长度 L2。 [Claim 2] A self-receiving bird cage array coil according to claim 1, wherein: the first end ring has a diameter D1 equal to a diameter D2 of the second end ring, and the first connecting portion The length L1 is equal to the length L2 of the second connecting segment.

[权利要求 3] 如权利要求 1所述的一种自发自收的鸟笼阵列线圈，其特征在于：所述第一端环的直径 D1等于第二端环的直径 D2，第一连接段的长度 L1 等于第二连接段的长度 L2，所述第一端环的直径 D1是第一连接段的长度 L1数值的两倍。 [Claim 3] The self-receiving bird cage array coil according to claim 1, wherein: the first end ring has a diameter D1 equal to a diameter D2 of the second end ring, and the first connecting portion The length L1 is equal to the length L2 of the second connecting segment, and the diameter D1 of the first end ring is twice the value of the length L1 of the first connecting segment.

[权利要求 4] 如权利要求 1所述的一种自发自收的鸟笼阵列线圈，其特征在于：所述第一连接段上的第一二极管上连接有直流控制信号 Td_l，所述第二连接段上的第二二极管上连接有直流控制信号 Td_2，直流控制信号 Td_l和直流控制信号 Td_2为同一信号源。 [Claim 4] The self-receiving bird cage array coil according to claim 1, wherein: a DC control signal Td_1 is connected to the first diode on the first connection segment, First A DC control signal Td_2 is connected to the second diode on the two connection segments, and the DC control signal Td_l and the DC control signal Td_2 are the same signal source.

[权利要求 5] 如权利要求 1所述的一种自发自收的鸟笼阵列线圈，其特征在于：所述第一连接段上的第一二极管上连接有直流控制信号 Td_l，所述第二连接段上的第二二极管上连接有直流控制信号 Td_2，直流控制信号 Td_l和直流控制信号 Td_2为相互独立的两个信号源。 [Claim 5] The self-receiving bird cage array coil according to claim 1, wherein: a DC control signal Td_1 is connected to the first diode on the first connection segment, A DC control signal Td_2 is connected to the second diode on the second connection segment, and the DC control signal Td_1 and the DC control signal Td_2 are two independent signal sources.

[权利要求 6] 如权利要求 1所述的一种自发自收的鸟笼阵列线圈，其特征在于：第一端环电容的数量为八，这八个第一端环电容等分第一端环，第二端环电容的数量为八，这八个第二端环电容等分第二端环，第三电容的数量为八，这八个第三电容等分环体，腿的数量为八，以逆吋针定义， 0度、 45度、 90度、 135度、 180度、 225度、 270度、 315度角上分别设置一个腿，其中角度相差 90度上的两个腿的相位相差 90度。 [Claim 6] A self-receiving birdcage array coil according to claim 1, wherein: the number of first end ring capacitors is eight, and the eight first end ring capacitors are equally divided into the first end. The number of the second end ring capacitors is equal to the second end ring, and the number of the third capacitor is eight. The eight third capacitors are equally divided into rings, and the number of legs is Eight, defined by the reverse needle, 0, 45, 90, 135, 180, 225, 270, 315 degrees, respectively, a leg, the angle of the two legs on the angle of 90 degrees The difference is 90 degrees.

[权利要求 7] 如权利要求 1所述的一种自发自收的鸟笼阵列线圈，其特征在于，包括一来自谱仪的射频信号源，射频信号源的输出端连接至一射频功放的输入端，射频功放的输出端连接至一正交功率分配器（1) 的输入端，正交功率分配器（1) 的两个输出端分别连接至正交功率分配器 (2) 的输入端、正交功率分配器（3) 的输入端，正交功率分配器（ 2) 具有两个输出端，正交功率分配器（2) 的每一所述输出端均依序连接 II路发射控制电路、 90度移相器、 II路隔离控制电路、 90度移相器、 II路接收控制电路、前置放大器，前置放大器输出信号， II路接收控制电路连接 II路收发控制信号，正交功率分配器（3) 具有两个输出端，正交功率分配器（3) 的每一所述输出端均依序连接 Q1路发射控制电路、 90度移相器、 Q1路隔离控制电路、 90度移相器、 Q1路接收控制电路、前置放大器，前置放大器输出信号， Q1路接收控制电路连接 Q1路收发控制信号。 [Claim 7] A self-receiving birdcage array coil according to claim 1, comprising a radio frequency signal source from a spectrometer, the output of the radio frequency signal source being connected to an input of an RF power amplifier The output end of the RF power amplifier is connected to the input end of a quadrature power splitter (1), and the two output ends of the orthogonal power splitter (1) are respectively connected to the input end of the orthogonal power splitter (2), An input of the orthogonal power divider (3), the orthogonal power splitter (2) has two outputs, and each of the outputs of the orthogonal power splitter (2) is sequentially connected to the II transmit control circuit , 90 degree phase shifter, II way isolation control circuit, 90 degree phase shifter, II way receiving control circuit, preamplifier, preamplifier output signal, II way receiving control circuit connected II way transceiver control signal, orthogonal power The distributor (3) has two output ends, and each of the output ends of the orthogonal power splitter (3) is sequentially connected with a Q1 way transmission control circuit, a 90 degree phase shifter, a Q1 way isolation control circuit, and 90 degrees. Phase shift , Q1 channel receiving control circuit, preamplifier, preamplifier output signal, Q1 channel receiving control circuit connected Q1 channel transceiver control signal.