公开(公告)号：US20130200897A1

公开(公告)日：2013-08-08

申请号：US13757459

申请日：2013-02-01

Applicant: TEC Edmonton ,  Alberta Health Services

Inventor： Iyer Ashwin ,  Justin Pollock ,  Nicola de Zanche

IPC: G01R33/28 ,  H01P11/00

CPC classification number: G01R33/28 ,  G01R33/4802 ,  H01P11/00 ,  Y10T29/49016

Abstract: A liner for a bore of a waveguide is provided. The liner as an aperture passing through it and is formed of a metamaterial that has a relative electrical permittivity that is negative and near zero. When the liner is installed in the waveguide, it lowers the cutoff frequency of the waveguide while allowing the waveguide to remain hollow. This liner can be used in the bore of an MRI machine to lower the cutoff frequency of the bore of the MRI machine to allow the MRI machine to operate using waves having a lower frequency that if the liner was not used.

Abstract translation: 提供了一种用于波导孔的衬套。 衬垫作为通过它的孔，并且由具有负和接近零的相对电容率的超材料形成。 当衬套安装在波导管中时，它降低波导的截止频率，同时允许波导保持中空。 该衬垫可用于MRI机器的孔中，以降低MRI机器的孔的截止频率，以允许MRI机器使用具有较低频率的波，如果不使用衬垫，则使用该波形。

公开(公告)号：US08653821B2

公开(公告)日：2014-02-18

申请号：US13172803

申请日：2011-06-29

Applicant: Wolfgang Renz ,  Karsten Wicklow

Inventor： Wolfgang Renz ,  Karsten Wicklow

IPC: G01V3/00

CPC classification number: G01R33/422 ,  G01R33/4802

Abstract: The present embodiments relate to a device and a method for attenuating a high-frequency field of a magnetic resonance tomography system, where at least one attenuation element attenuating high-frequency fields is provided outside a magnetic resonance tomography field of view.

Abstract translation: 本实施例涉及用于衰减磁共振断层摄影系统的高频场的装置和方法，其中至少一个衰减高频场的衰减元件设置在磁共振断层摄影视野外。

公开(公告)号：US20130241549A1

公开(公告)日：2013-09-19

申请号：US13819275

申请日：2011-08-18

Applicant: Andrew Kiruluta

Inventor： Andrew Kiruluta

IPC: G01R33/32 ,  G01R33/44

CPC classification number: G01R33/32 ,  G01R33/445 ,  G01R33/4802

Abstract: In an MRI scanner, the transmission and reception of RF excitation and detected signal waves is accomplished using far field excitation instead of conventional near field excitation. By superimposing two counter-propagating waves from the same source in the MRI sample interference fringes are recorded in the sample in such a way that the relative phase between the two propagation wave vectors determines the periodicity of the maxima and minima in the interference fringe pattern. The complete fringe pattern, known as a spatial hologram, contains both the phase and amplitude information of the information-bearing wave. When exposed to a replica of the original reference wave, the fringe pattern acts as a diffraction grating, reproducing the information-bearing field propagating at the same relative phase.

Abstract translation: 在MRI扫描仪中，RF激发和检测信号波的发射和接收使用远场激励而不是传统的近场激励来实现。 通过在MRI样本中叠加来自相同源的两个反向传播波，将干涉条纹记录在样本中，使得两个传播波矢量之间的相对相位确定干涉条纹图案中的最大值和最小值的周期性。 称为空间全息图的完整条纹图案包含信息承载波的相位和幅度信息。 当暴露于原始参考波的复制品时，条纹图案用作衍射光栅，再现在相同相对相位传播的信息承载场。

公开(公告)号：US20130082710A1

公开(公告)日：2013-04-04

申请号：US13250202

申请日：2011-09-30

Applicant: James S. Tropp

Inventor： James S. Tropp

IPC: G01R33/345 ,  H01F41/02 ,  G01R33/28

CPC classification number: G01R33/4802 ,  G01R33/345

Abstract: A system for travelling wave MR imaging includes an MR imaging apparatus having a magnet coil assembly having a magnet coil bore extending therethrough, a gradient coil assembly positioned within the magnet coil bore and having a gradient coil bore extending therethrough, and a waveguide positioned within the gradient coil bore. The waveguide has a waveguide bore extending therethrough. A computer is programmed to access a scan sequence comprising an RF pulse sequence and execute the scan sequence. During execution of the scan sequence, the computer is programmed to operate the waveguide in a hybrid mode to transmit an RF pulse of the RF pulse scan sequence as a travelling wave at a frequency lower than a cutoff frequency of a principal mode of the waveguide absent a dielectric core and to acquire MR signals from an imaging subject positioned within the waveguide bore.

Abstract translation: 用于行波MR成像的系统包括具有磁铁线圈组件的MR成像装置，磁体线圈组件具有延伸穿过其中的磁体线圈孔，位于磁体线圈孔内的梯度线圈组件，并且具有延伸穿过其中的梯度线圈孔， 梯度线圈孔。 波导具有延伸穿过其中的波导孔。 计算机被编程以访问包括RF脉冲序列的扫描序列并执行扫描序列。 在执行扫描序列期间，计算机被编程为以混合模式操作波导，以将RF脉冲扫描序列的RF脉冲作为行波以低于波导的主模式的截止频率的频率传输 介质芯并且从位于波导孔内的成像对象获取MR信号。

公开(公告)号：US20120169340A1

公开(公告)日：2012-07-05

申请号：US13394969

申请日：2010-09-14

Applicant: Christoph Leussler ,  Daniel Wirtz

Inventor： Christoph Leussler ,  Daniel Wirtz

IPC: G01R33/48 ,  G01R33/32

CPC classification number: G01R33/345 ,  G01R33/341 ,  G01R33/343 ,  G01R33/4802

Abstract: The invention relates to a magnetic resonance imaging system (1) comprising: a main magnet for generating a uniform, steady magnetic field within an examination volume (21), an RF waveguide (19) for guiding travelling RF waves along an axis of the examination volume (21) in at least one travelling mode of the RF waveguide (19), at least one RF antenna (9) for transmitting RF pulses to and/or receiving MR signals from a body (10) of a patient positioned in the examination volume (21), wherein the RF antenna (9) is configured to couple to the at least one travelling mode of the RF waveguide (19), and wherein the RF antenna (9) is located on the imaging system such that the examination volume (21) is freely accessible, a control unit (15) for controlling the temporal succession of RF pulses, and a reconstruction unit (17) for reconstructing an MR image from the received MR signals. Further, the invention relates to an RF antenna (9) for an MR imaging system (1), wherein the RF antenna (9) is formed by an electrically conductive plate (22) comprising at least one recess (23).

Abstract translation: 本发明涉及一种磁共振成像系统（1），包括：用于在检查体积（21）内产生均匀的稳定磁场的主磁体，用于沿检查轴引导行波RF波的RF波导（19） 在RF波导（19）的至少一个行进模式中的体积（21），用于将RF脉冲发送到和/或接收来自位于检查中的患者的身体（10）的MR信号的至少一个RF天线（9） （21），其中所述RF天线（9）被配置为耦合到所述RF波导（19）的所述至少一个行进模式，并且其中所述RF天线（9）位于所述成像系统上，使得所述检查体积 （21）可自由访问，用于控制RF脉冲的时间连续的控制单元（15），以及用于从所接收的MR信号重建MR图像的重建单元（17）。 此外，本发明涉及一种用于MR成像系统（1）的RF天线（9），其中RF天线（9）由包括至少一个凹部（23）的导电板（22）形成。

公开(公告)号：US09952297B2

公开(公告)日：2018-04-24

申请号：US14706143

申请日：2015-05-07

Applicant: AUBURN UNIVERSITY

Inventor： Shumin Wang

IPC: G01V3/00 ,  G01R33/345 ,  G01R33/34 ,  G01R33/36 ,  G01R33/48

CPC classification number: G01R33/345 ,  G01R33/34092 ,  G01R33/3635 ,  G01R33/3657 ,  G01R33/3678 ,  G01R33/4802

Abstract: A parallel plate waveguide forms a volume coil used for magnetic resonance imaging and spectroscopy. The waveguide includes a first conductor arranged on a first side of the waveguide and a second conductor arranged on a second side of the waveguide. Excitation of the first conductor and the second conductor creates a transverse electromagnetic field between the first conductor and the second conductor which causes a target within the volume coil to emit radio frequency signals used for producing an image of the target.

公开(公告)号：US20180067182A1

公开(公告)日：2018-03-08

申请号：US15697092

申请日：2017-09-06

Applicant: THE ROYAL INSTITUTION FOR THE ADVANCEMENT OF LEARNING/MCGILL UNIVERSITY ,  FRIEDRICH-ALEXANDER-UNIVERSITAT ERLANGEN-NURNBERG

Inventor： Aashish CLERK ,  Martin HOUDE ,  Florian MARQUARDT ,  Vittorio PEANO CAVASOLA

IPC: G01R33/48 ,  H03F1/56 ,  H03F3/189 ,  H03F3/20 ,  H03F3/213 ,  H03F7/02

CPC classification number: G01R33/4802 ,  H03F1/56 ,  H03F3/189 ,  H03F3/20 ,  H03F3/213 ,  H03F7/02 ,  H03F19/00

Abstract: A topologically-protected traveling-wave amplifier includes resonators arranged in a two-dimensional array defining a periphery including a first edge. An output line is coupled to an output resonator disposed along the first edge spaced from an input resonator coupled to an output line. A synthetic gauge field generator associated with the resonators provides a topologically-protected edge state corresponding to propagation along the periphery in a propagation direction from the input resonator along the first edge to the output resonator. A parametric driving element creates pairs of photons in the edge state and amplifies a signal propagating along the first edge in the propagation direction. A signal incident from the input line propagates in the propagation direction along the first edge while being amplified and is detected at the output line as an amplified signal. A signal incident from the output line is attenuated before emerging at the input resonator.

公开(公告)号：US20170299676A1

公开(公告)日：2017-10-19

申请号：US15490597

申请日：2017-04-18

Applicant: VANDERBILT UNIVERSITY

Inventor： Adam W. ANDERSON ,  John GORE

IPC: G01R33/44 ,  G01R33/36

CPC classification number: G01R33/5659 ,  G01R33/3607 ,  G01R33/4802

Abstract: Methods for operating a magnetic resonance apparatus and systems therefrom are provided. A method includes generating, via a coil former surrounding a subject or object of interest and disposed in the magnetic resonance apparatus, a plurality of field modes external to the subject or object, measuring for each of the plurality of external field modes, an associated internal field produced within the subject or object, generating, via the coil former a combination of external modes to produce a target internal field in the subject or object, and measuring nuclear magnetic resonance signals due to the resulting field from the combination to acquire an image or spectrum of the subject or object.

公开(公告)号：US09529062B2

公开(公告)日：2016-12-27

申请号：US13757459

申请日：2013-02-01

Applicant: The Governors of the University of Alberta ,  Alberta Health Services

Inventor： Ashwin Iyer ,  Justin Pollock ,  Nicola de Zanche

IPC: G01V3/00 ,  G01R33/28 ,  H01P11/00 ,  G01R33/48

CPC classification number: G01R33/28 ,  G01R33/4802 ,  H01P11/00 ,  Y10T29/49016

Abstract: A liner for a bore of a waveguide is provided. The liner as an aperture passing through it and is formed of a metamaterial that has a relative electrical permittivity that is negative and near zero. When the liner is installed in the waveguide, it lowers the cutoff frequency of the waveguide while allowing the waveguide to remain hollow. This liner can be used in the bore of an MRI machine to lower the cutoff frequency of the bore of the MRI machine to allow the MRI machine to operate using waves having a lower frequency that if the liner was not used.

Abstract translation: 提供了一种用于波导孔的衬套。 衬垫作为通过它的孔，并且由具有负和接近零的相对电容率的超材料形成。 当衬套安装在波导管中时，它降低波导的截止频率，同时允许波导保持中空。 该衬垫可用于MRI机器的孔中，以降低MRI机器的孔的截止频率，以允许MRI机器使用具有较低频率的波，如果不使用衬垫，则使用该波形。

公开(公告)号：US09423476B2

公开(公告)日：2016-08-23

申请号：US13446689

申请日：2012-04-13

Applicant: Graham C. Wiggins ,  Bei Zhang ,  Daniel K. Sodickson

Inventor： Graham C. Wiggins ,  Bei Zhang ,  Daniel K. Sodickson

IPC: G01R33/345 ,  G01R33/48

CPC classification number: G01R33/345 ,  G01R33/4802

Abstract: In accordance with certain exemplary embodiments of the present disclosure, provided herein are apparatus, systems and methods for, e.g., facilitating signal excitation and/or reception in a magnetic resonance system, such as, e.g., a system configured for magnetic resonance imaging (MRI) and/or spectroscopy. For example, exemplary embodiments of a method for traveling wave imaging in an MRI system can include, e.g., a circular conductive structure lying in a transverse plane within the scanner bore. The exemplary structure can be concentric with the center of the scanner RF shield. The structure can be arranged to have a resonant mode at the MR frequency characterized by a current pattern which can be configured to excite and receive an exemplary waveguide mode. The exemplary current pattern can be further configured to facilitate traveling wave imaging, for example.

Abstract translation: 根据本公开的某些示例性实施例，本文提供了用于例如在磁共振系统中促进信号激发和/或接收的装置，系统和方法，例如，被配置用于磁共振成像（MRI） ）和/或光谱学。 例如，在MRI系统中用于行波成像的方法的示例性实施例可以包括例如位于扫描器孔内的横向平面内的圆形导电结构。 示例性结构可以与扫描器RF屏蔽的中心同心。 该结构可以被布置成在MR频率处具有谐振模式，其特征在于可以配置为激发和接收示例性波导模式的电流模式。 例如，该示例性电流模式可进一步配置成便于行波成像。