-
公开(公告)号：US5107216A
公开(公告)日：1992-04-21
申请号：US473428
申请日：1990-02-01
IPC分类号： G01R33/32 , A61B5/055 , G01R33/343 , G01R33/36
CPC分类号： G01R33/3657 , G01R33/343
摘要： In an imaging apparatus using the nuclear magnetic resonance, a solenoid coil and a slot-resonator coil are combined with each other so as to constitute a quadrature-phase detection probe. In order to operate the slot-resonator coil at low frequency, inductance is added to the slot-resonator coil. Further in order to cut the coupling between a transmitting coil and a receiving coil in a cross coil system, a capacitor together with the added inductance to form a resonant circuit is connected in parallel to the inductance. A favorable probe can be obtained in a vertical-magnetic field type imaging apparatus.
摘要翻译： 在使用核磁共振的成像装置中，螺线管线圈和缝隙谐振器线圈彼此组合以构成正交相位检测探针。 为了以低频操作缝隙谐振器线圈，电感被加到缝隙谐振器线圈上。 此外，为了切断交叉线圈系统中的发送线圈和接收线圈之间的耦合，电容器与附加的电感一起形成谐振电路并联连接到电感。 可以在垂直磁场型成像装置中获得良好的探针。
-
62.发明授权
公开(公告)号：US4791372A
公开(公告)日：1988-12-13
申请号：US86368
申请日：1987-08-17
IPC分类号： A61B10/00 , A61B5/055 , G01R33/34 , G01R33/341 , G01R33/343 , G01R33/20
CPC分类号： G01R33/341 , G01R33/343 , G01R33/34084
摘要： A pickup coil for magnetic resonance imaging (MRI) includes a single thin metal copper sheet which is covered with cloth-like material with the interior of the two ends of the coil being covered with VELCRO-type connective material so that they adhere together. Thus, this provides a conforming fit to various specimens of varying diameters and configurations. The two ends of the coil are held by and inserted in a capacitive tuning unit which compensates for the resistive loading caused by the specimen and also for implementing the needed resonance condition.
-
公开(公告)号：US4780677A
公开(公告)日：1988-10-25
申请号：US44701
申请日：1987-05-01
IPC分类号： G01R33/343 , G01R33/36 , G01R33/20
CPC分类号： G01R33/343 , G01R33/3628
摘要： An RF probe for acquiring MR data comprising four loop means. There are first and second loop means that are substantially round, centered about a longitudinal axis of said probe and spaced apart substantially the length of said probe to define a cylindrical shape therebetween. There are third and fourth loop means being substantially saddle shaped spaced apart, oppositely disposed and extending between said first and second loop means. Conductors attached to said first and second loop means at points on said first and second loop means spaced apart by 180 degrees couple said third and fourth loop means to said first and second loop means to form a point of psuedo-saddle coils providing extremely homogenous signals.
摘要翻译： 一种用于获取包括四个环路装置的MR数据的RF探针。 存在基本上圆形的第一和第二环形装置，其围绕所述探针的纵向轴线居中并且基本上间隔开所述探针的长度以在其间限定圆柱形形状。 存在第三和第四环形装置，其基本上鞍形间隔开，相对设置并在所述第一和第二环路装置之间延伸。 连接到所述第一和第二回路装置上的导体在所述第一和第二回路装置上的间隔180度的点将所述第三和第四回路装置耦合到所述第一和第二回路装置，以形成提供非常均匀的信号的伪装鞍形线圈 。
-
公开(公告)号：US4755756A
公开(公告)日：1988-07-05
申请号：US13901
申请日：1987-02-12
申请人： Susumu Nishihara , Kiyoshi Yoda
发明人： Susumu Nishihara , Kiyoshi Yoda
IPC分类号： G01R33/343 , G01R33/36 , G01R33/20
CPC分类号： G01R33/3628 , G01R33/343
摘要： A radio frequency coil for nuclear magnetic resonance imaging comprises at least one pair of arcuate H-shaped members which are disposed about a longitudinal axis so as to form a tube. A variable capacitor means for adjusting the resonant frequency of the coil is connected across the feeding points of the coil. A balanced feed circuit comprising a balanced impedance matching circuit and a balanced-to-unbalanced converter is connected across the feeding points. An unbalanced current from a transceiver is converted into balanced currents which are fed to the feeding points.
摘要翻译： 用于核磁共振成像的射频线圈包括至少一对弓形H形构件，其围绕纵向轴线设置以形成管。 用于调节线圈的谐振频率的可变电容器装置连接在线圈的馈电点上。 包括平衡阻抗匹配电路和平衡不平衡转换器的平衡馈电电路连接在馈电点上。 来自收发器的不平衡电流被转换成馈送到馈电点的平衡电流。
-
65.发明授权Cavity resonator with improved magnetic field uniformity for high frequency operation and reduced dielectric heating in NMR imaging devices 失效具有改进的磁场均匀性的腔谐振器，用于高频操作和减少NMR成像装置中的介电加热
公开(公告)号：US4751464A
公开(公告)日：1988-06-14
申请号：US45403
申请日：1987-05-04
申请人： James F. Bridges
发明人： James F. Bridges
IPC分类号： H01P7/06 , A61B5/055 , G01R33/34 , G01R33/341 , G01R33/343 , G01R33/345 , G01R33/20
CPC分类号： G01R33/3678 , G01R33/343 , G01R33/34007
摘要： A cavity resonator suitable for use in a high-speed nuclear magnetic resonance (NMR) imaging device comprises a plurality of transmission lines aligned parallel to a common axis and magnetically coupled to produce an essentially uniform dipole magnetic field perpendicular to the axis. The transmission lines are two conductor lines, with the first conductors being arranged inwardly of a second conductor common to all lines. The common conductor is symmetrically arranged about the axis of the resonator and constitutes a shield to contain the magnetic field within the cavity. The plurality of transmission lines are conductively isolated from each other but spaced in sufficiently close proximity to each to provide for strong mutual magnetic coupling amongst all transmission lines. A single inductive coupling loop may be provided for driving the resonator with a linearly polarized magnetic field and for receiving NMR information from the resonator. The use of a pair of inductive coupling loops spaced 90.degree. about the resonator axis provides a circularly polarized magnetic field within the resonator when the loops are driven in electrical phase quadrature. Two inductive coupling loops for each imaging mode may be provided to eleminate undesirable modes and hence distortion in the NMR image. The common conductor and the longitudinal ends of the resonator are provided with slits designed to allow the changing high-speed gradient magnetic fields to fill the imaging volume fast enough to accomplish high-speed imaging.
-
公开(公告)号：US4740751A
公开(公告)日：1988-04-26
申请号：US894313
申请日：1986-08-07
申请人： George J. Misic , John L. Patrick
发明人： George J. Misic , John L. Patrick
CPC分类号： G01R33/34069 , G01R33/343 , G01R33/3628 , G01R33/34007 , G01R33/341
摘要： A resonator coil assembly (32) includes a dielectric sleeve (40) on which a first resonator coil portion (42) and a second resonator coil portion (44), each of copper foil, are adhered. The dielectric sleeve is dimensioned to receive a human torso therein and in one embodiment (FIG. 1) is circular in cross section and in another (FIG. 4) is elliptical in cross section. A pair of adjustable tuning capacitances (64, 66) and a pair of adjustable matching capacitances (68, 70) are interconnected between one end of the each coil portion and a metal bore liner (54). An opposite end of the coil portions are capacitively coupled to each other (FIG. 1) or to the bore liner (FIG. 3). A half wave length cable (72) interconnects the junctions between the first and second tuning and matching capacitances. One of these junctions is connected by a cable (74) with a radio frequency generator (30) and a radio receiver (34).
摘要翻译： 谐振器线圈组件（32）包括电介质套筒（40），其上粘附有每个铜箔的第一谐振器线圈部分（42）和第二谐振器线圈部分（44）。 电介质套筒的尺寸被设计成在其中容纳人体躯干，在一个实施例中（图1）的横截面是圆形的，而另一个（图4）的横截面是椭圆形的。 一对可调节调谐电容（64,66）和一对可调整的匹配电容（68,70）在每个线圈部分的一端和金属内衬（54）之间互连。 线圈部分的相对端部彼此电容耦合（图1）或孔径衬套（图3）。 半波长电缆（72）互连第一和第二调谐和匹配电容之间的结。 这些连接点中的一个通过具有射频发生器（30）的电缆（74）和无线电接收器（34）连接。
-
公开(公告)号：US4724389A
公开(公告)日：1988-02-09
申请号：US731923
申请日：1985-05-08
CPC分类号： G01R33/343
摘要： A local probe for use in nuclear magnetic resonance imaging includes a pair of loop-gap resonators which are connected together and positioned adjacent a region of interest. FID signals produced in the region of interest induce signals in coupling loops mounted near each loop-gap resonator, and these connect to a transmission line leading to the receiver. Three embodiments are disclosed, one best suited for imaging appendages, a second best suited for imaging the head and neck, and a third best suited for the spine.
摘要翻译： 用于核磁共振成像的本地探针包括一对连接在一起并位于感兴趣区域附近的环形间隙谐振器。 在感兴趣区域中产生的FID信号在安装在每个环形间隙谐振器附近的耦合回路中引起信号，并且这些信号连接到通向接收器的传输线。 公开了三个实施例，一个最适合于成像附件，第二个最适合于头部和颈部成像，以及最适合于脊柱的第三实施例。
-
公开(公告)号：US4717880A
公开(公告)日：1988-01-05
申请号：US893219
申请日：1986-08-05
申请人： Mitsuhiro Ono , Kokusho Sha , Michiya Suzuki , Tateaki Ogata , Ekuo Yoshida
发明人： Mitsuhiro Ono , Kokusho Sha , Michiya Suzuki , Tateaki Ogata , Ekuo Yoshida
IPC分类号： G01R33/343 , G01R33/345 , G01N24/10
CPC分类号： G01R33/343 , G01R33/345
摘要： The prior art split-ring resonator for use in an electron spin resonance (ESR) spectrometer comprises a circular cylinder made from an electrically conductive material and housed in a metallic tube. The cylinder is provided with a split extending axially of the cylinder. A sample to be investigated is inserted into the cylinder in the axial direction. In accordance with the invention, a shielding member which is wider than said slit and made from an electrically conductive material is disposed so as to shield the slit from the inside of the cylinder, whereby the resonance frequency of the resonator is not significantly affected by the presence or absence of the sample or by the amount of the inserted sample.
摘要翻译： 用于电子自旋共振（ESR）光谱仪的现有技术的分裂环谐振器包括由导电材料制成并容纳在金属管中的圆柱体。 气缸设有沿气缸轴向延伸的开口。 要研究的样品沿轴向插入圆柱体中。 根据本发明，由导电材料制成的比所述狭缝更宽的屏蔽构件被设置为将狭缝从气缸的内部屏蔽起来，由此谐振器的谐振频率不受 存在或不存在样品或插入样品的量。
-
公开(公告)号：US4633180A
公开(公告)日：1986-12-30
申请号：US567960
申请日：1984-01-04
IPC分类号： G01R33/343 , G01R33/345 , H01P7/06 , G01R33/08
CPC分类号： G01R33/343 , G01R33/345 , H01P7/06
摘要： A cavity resonator serves to generate magnetic dipole transitions in a sample, for instance for carrying out electron spin resonance measurements. The natural frequency of the cavity resonator (10) is influenced by a reduction in length of the E flux lines. To this end, conductive areas (20) are arranged at the points where the E flux lines are encountered. This results in an increase of the space factor, related to an unchanged specimen volume, and thus in an improvement of the measuring sensitivity.
摘要翻译： 空腔谐振器用于在样品中产生磁偶极子跃迁，例如用于进行电子自旋共振测量。 空腔谐振器（10）的固有频率受到E磁通线长度的减小的影响。 为此，导电区域（20）被布置在遇到E磁通线的点处。 这导致空间因子的增加，与样本体积不变有关，因此提高了测量灵敏度。
-
70.发明授权公开(公告)号：US11726152B1
公开(公告)日：2023-08-15
申请号：US17896416
申请日：2022-08-26
申请人： JEOL LTD.
发明人： Albert Zens
IPC分类号： G01R33/36 , G01R33/34 , G01R33/30 , G01R33/343
CPC分类号： G01R33/3635 , G01R33/307 , G01R33/343 , G01R33/34053 , G01R33/34092
摘要： In various embodiments of the invention, a solid sample magic angle spinning nuclear magnetic resonance (NMR) probe can utilize an appropriate inductance parent coil with a fixed capacitor and introducing an idler coil with a variable capacitor which can inductively couple to the parent coil by adjusting the variable capacitance of the idler coil. By coupling the idler coil to the parent coil in this manner a double resonance circuit can be provided without the disadvantages of prior art coils. In an alternative embodiment of the invention, a solid sample magic angle spinning nuclear magnetic resonance probe can utilize an appropriate inductance parent coil with a fixed capacitor, introducing an idler coil with a variable capacitor in a first region and two variable inductor coupling coils and two coupling coils in a second region, where the two variable inductors are connected to the parent coil to reduce the number of coils in the sample region of the NMR probe, where variable inductors can inductively couple to the parent coil by adjusting one or both the capacitance of the variable capacitor of the idler coil and/or adjusting the variable inductors to observe a tuned condition between the parent coil and the idler coil.
-
-
-
-
-
-
-
-
-
搜索结果
97 条记录 (耗时 0.015 秒)
