公开(公告)号：US20180224513A1

公开(公告)日：2018-08-09

申请号：US15890539

申请日：2018-02-07

申请人： Siemens Healthcare GmbH

发明人： Mario Zeller

IPC分类号： G01R33/56 ,  G01R33/36 ,  G01R33/48 ,  G01R33/34 ,  G01R33/54 ,  G01R33/561

CPC分类号： G01R33/5602 ,  G01R33/34092 ,  G01R33/3671 ,  G01R33/4812 ,  G01R33/543 ,  G01R33/5608 ,  G01R33/5611 ,  G01R33/5612 ,  G01R33/56563 ,  G01R33/56572

摘要： In a magnetic resonance (MR) apparatus and an operating method therefor, the MR apparatus has multiple reception coils each having an associated reception channel, a reference dataset is obtained from an examination volume of a subject, wherein the reference dataset completely fills a region of k-space. In a computer, a subregion of the examination volume is determined that has a lower homogeneity than other subregions of the examination volume, and the computer also determines at least one of the reception channels in which raw data signals are received that have a higher intensity in the determined subregion than others of the reception channels. The computer calculates a weighting matrix, in which signals, the determined reception channel are given a lower weighting than signals from the other channels. The weighting matrix is then applied to diagnostic data acquired with parallel imaging using the multiple reception coils and channels.

公开(公告)号：US09841475B2

公开(公告)日：2017-12-12

申请号：US14306576

申请日：2014-06-17

申请人： Ralph Kimmlingen ,  Norbert Rietsch

发明人： Ralph Kimmlingen ,  Norbert Rietsch

IPC分类号： G01R33/34 ,  G01R33/36 ,  G01R33/54 ,  G01R33/421 ,  A61B5/055 ,  G01R33/3415

CPC分类号： G01R33/3671 ,  A61B5/055 ,  G01R33/34092 ,  G01R33/3415 ,  G01R33/421 ,  G01R33/543

摘要： The embodiments relate to a magnetic resonance imaging device, where the cladding of the patient bore of the MR imaging device includes a conductive layer.

公开(公告)号：US20170315258A1

公开(公告)日：2017-11-02

申请号：US15143267

申请日：2016-04-29

申请人： Schlumberger Technology Corporation

发明人： Diogenes David Molina ,  Eugene Janssen ,  Krishnamurthy Ganesan ,  Nicholas Heaton ,  Vassilis Varveropoulos

IPC分类号： G01V3/32 ,  G01R33/58 ,  G01R33/44 ,  G01N15/08

CPC分类号： G01V3/32 ,  G01N15/08 ,  G01N2015/0846 ,  G01R33/3671 ,  G01R33/448 ,  G01R33/58

摘要： A method to calibrate a nuclear magnetic resonance tool is disclosed having steps of starting a nuclear magnetic resonance sequence from the nuclear magnetic resonance tool, disabling an active damping circuit in the nuclear magnetic resonance tool, collecting auxiliary calibration data for the nuclear magnetic resonance tool, estimating a natural Q value for the nuclear magnetic resonance tool, determining an optimal active damping setting for the tool, deploying the optimal active damping setting for the tool, collecting nuclear magnetic resonance response data generated from the nuclear magnetic resonance sequence and calibrating the nuclear magnetic resonance data.

公开(公告)号：US20050189943A1

公开(公告)日：2005-09-01

申请号：US10823273

申请日：2004-04-12

申请人： Robert Hammond ,  Jonathan Sun ,  Douglas Scalapino ,  Timothy James ,  Lincoln Bourne

发明人： Robert Hammond ,  Jonathan Sun ,  Douglas Scalapino ,  Timothy James ,  Lincoln Bourne

IPC分类号： G01R33/34 ,  H01F6/06 ,  H01G4/008 ,  H01L39/16 ,  H01P1/203 ,  H01P7/08 ,  H01Q1/36 ,  H03K17/00 ,  H03K17/78 ,  H03K17/92 ,  G01V3/00

CPC分类号： H01G4/008 ,  G01R33/34007 ,  G01R33/34023 ,  G01R33/34053 ,  G01R33/341 ,  G01R33/3642 ,  G01R33/3671 ,  H01F6/06 ,  H01P1/203 ,  H01P7/08 ,  H01P7/088 ,  H01Q1/364 ,  H03K17/78 ,  H03K17/92 ,  H03K2217/0036

摘要： A method of tuning a high temperature superconductor (HTS) resonator includes the steps of providing a HTS inductor and a HTS capacitor, the HTS capacitor being electrically connected to the HTS inductor. A tuning body is provided adjacent to the HTS inductor and the HTS capacitor. The relative position of the tuning body with respect to the HTS inductor and the HTS capacitor is altered so as to tune the resonator. A tunable resonant circuit is provided that includes a substrate having a planar surface. At least one resonator formed from HTS material is disposed on the substrate, the resonator having one or more turns that when combined, turn through greater than 360°.

摘要翻译： 调谐高温超导体（HTS）谐振器的方法包括提供HTS电感器和HTS电容器的步骤，HTS电容器电连接到HTS电感器。 调谐体靠近HTS电感和HTS电容。 改变调谐体相对于HTS电感器和HTS电容器的相对位置，以调谐谐振器。 提供了包括具有平坦表面的基板的可调谐谐振电路。 由HTS材料形成的至少一个谐振器设置在基板上，谐振器具有一个或多个匝，当组合时，该谐振器转过大于360°。

公开(公告)号：US5387868A

公开(公告)日：1995-02-07

申请号：US116387

申请日：1993-09-02

申请人： Johan W. Rust ,  Teunis R. Van Heelsbergen

发明人： Johan W. Rust ,  Teunis R. Van Heelsbergen

IPC分类号： A61B5/055 ,  G01R33/36 ,  G01R33/58 ,  G01V3/00

CPC分类号： G01R33/3621 ,  G01R33/3671 ,  G01R33/58

摘要： In magnetic resonance apparatus in a magnet system (1) for generating a steady magnetic field, a coil system (3) for generating gradient fields, and at least one RF coil (9) which is tuned to a predetermined frequency and connected to first and second input terminals (53, 55) of an input amplifier circuit (43) of a receiving device (13) for RF order to enable simulation of the loading of the RF coil (9) by a patient during installation and testing of the operation of the apparatus without utilizing a load phantom, the circuit formed by the RF coil (9) and the input amplifier circuit (43) comprises a load network (61 ). In one embodiments first and second input terminals (53, 55) of the input amplifier circuit (43) are interconnected via the load network (61) which comprises a series connection of a switch (63) and a resistor (65). The switch is preferably formed by a diode (63), one electrode of which is connected to one of the input terminals (53) of the input amplifier circuit (43), its other electrode being connected to one end of the resistor (65), the other end of which is connected to the other input terminal (55) via a capacitor (73). The junction point of the resistor (65) and the capacitor (73) is connected to a control terminal (71) whereto a positive or a negative direct voltage, relative to the first input terminal (53), can be applied as desired in order to set the diode (63) to a conductive state or a blocked state.

摘要翻译： 在用于产生稳定磁场的磁体系统（1）的磁共振装置中，用于产生梯度场的线圈系统（3）和至少一个调谐到预定频率并连接到第一和第 用于RF命令的接收装置（13）的输入放大器电路（43）的第二输入端子（53,55），以便在安装和测试操作期间由患者模拟RF线圈（9）的负载 该装置不使用负载体模，由RF线圈（9）和输入放大器电路（43）形成的电路包括负载网络（61）。 在一个实施例中，输入放大器电路（43）的第一和第二输入端子（53,55）经由负载网络（61）互连，负载网络（61）包括开关（63）和电阻器（65）的串联连接。 开关优选地由二极管（63）形成，二极管（63）的一个电极连接到输入放大器电路（43）的一个输入端子（53），其另一个电极连接到电阻器（65）的一端， ，其另一端经由电容器（73）与另一方的输入端子（55）连接。 电阻器65和电容器73的接点连接到控制端子71，在控制端子71上可以根据需要依次施加相对于第一输入端子（53）的正或负直流电压 以将二极管（63）设置为导通状态或阻塞状态。

公开(公告)号：US20170205481A1

公开(公告)日：2017-07-20

申请号：US15408555

申请日：2017-01-18

申请人： SAMSUNG ELECTRONICS CO., LTD.

发明人： Jin-sub KIM ,  Raghavendra PUTTI

IPC分类号： G01R33/36 ,  G01R33/58

CPC分类号： G01R33/3671 ,  G01R33/3628 ,  G01R33/3657 ,  G01R33/583

摘要： A magnetic resonance imaging (MRI) apparatus and a method of detecting an error of the MRI apparatus are provided. The MRI apparatus includes a radio frequency (RF) coil configured to transmit and receive an RF signal, a bias circuit configured to tune and detune the RF coil, and a monitoring circuit configured to monitor a parameter among a bias voltage and a bias current of the bias circuit, based on a monitoring pattern. The MRI apparatus further includes a controller configured to determine whether the bias circuit is in an abnormal state, based on a determination criteria and the monitored parameter, and either one or both of the monitoring pattern and the determination criteria vary based on a status of the bias circuit.

公开(公告)号：US20170198571A1

公开(公告)日：2017-07-13

申请号：US15100845

申请日：2015-08-13

申请人： Halliburton Energy Services, Inc.

发明人： Lakshmi Sri Jyothi Chimakurthy

IPC分类号： E21B49/00 ,  G01V3/32 ,  G01V3/30 ,  E21B47/12

CPC分类号： E21B49/00 ,  E21B47/12 ,  E21B47/122 ,  G01R33/3671 ,  G01V3/30 ,  G01V3/32 ,  H03F3/19 ,  H03F2200/294 ,  H03F2200/451 ,  H03K17/687

摘要： Circuits including a low noise amplifier (LNA) configured to receive a radio-frequency (RF) that include an input transistor to receive a waveform control signal at a gate terminal are provided. The circuits include a control transistor configured to receive a gate signal from a source terminal in the input transistor when the waveform control signal is high and to discharge the gate signal into a current sink coupled to ground when the waveform control signal is low at a controlled rate based on a resistor-capacitor (RC) network and a changing gain of the control transistor. The circuits include a buffer and a dump transistor to connect the critical resistor for optimal damping to the input of LNA when the dump transistor is ‘on’ and disconnect when the dump transistor if off. Systems and methods for use in an NMR sensor including a circuit as above are also provided.

公开(公告)号：US20150177345A1

公开(公告)日：2015-06-25

申请号：US14416075

申请日：2013-07-24

申请人： KONINKLIKE PHILIPS N.V.

发明人： Cornelis Leonardus Gerardus Ham

IPC分类号： G01R33/36

CPC分类号： G01R33/3671 ,  G01R33/3614 ,  G01R33/3852 ,  G01R33/3854

摘要： The present invention relates to a method for supplying current to a gradient coil (107,207) of a magnetic resonance imaging system (100) by a gradient amplifier (222), the method comprising: supplying, by an electrical power supply (241), a voltage at first level to the gradient amplifier output to generate a gradient current in the gradient coil (107,207) to produce a magnetic gradient field at an slew rate, wherein the slew rate is set to a first value, resetting the slew rate to a second value, comparing the second value to the first value, and adjusting the voltage to a second level if the second value is different from the first value.

摘要翻译： 本发明涉及一种通过梯度放大器（222）向磁共振成像系统（100）的梯度线圈（107,207）提供电流的方法，所述方法包括：通过电源（241）将电源 电压到所述梯度放大器输出以在所述梯度线圈（107,207）中产生梯度电流以产生转换速率的磁梯度场，其中所述转换速率被设置为第一值，将所述转换速率重置为第二值 值，将所述第二值与所述第一值进行比较，以及如果所述第二值与所述第一值不同，则将所述电压调整到第二电平。

公开(公告)号：US20150022209A1

公开(公告)日：2015-01-22

申请号：US14128423

申请日：2012-06-14

申请人： Howard Halpern ,  Subramanian V. Sundramoorthy ,  Boris Epel

发明人： Howard Halpern ,  Subramanian V. Sundramoorthy ,  Boris Epel

IPC分类号： G01R33/343 ,  G01R33/60

CPC分类号： G01R33/343 ,  A61B5/055 ,  G01R33/34069 ,  G01R33/3671 ,  G01R33/60

摘要： Techniques provide for passive Q switching in a bimodal resonator environment, where magnetic resonators are coupled for power transfer. A passive Q switch is responsive to a driving power from one magnetic resonator coupled to another magnetic resonator. After the driving power reaches a threshold, the passive Q switch shunts the receiving magnetic resonator, at least partially, to reduce the Q of that second resonator, which allows faster detection operation of the second resonator in some applications. The technique allows for fast Q switching in a bimodal resonator system, especially one having resonators having magnetic fields that are orthogonal to one another.

摘要翻译： 技术在双模谐振器环境中提供无源Q开关，其中磁共振器耦合用于功率传输。 无源Q开关响应于耦合到另一个磁共振器的一个磁共振器的驱动功率。 在驱动功率达到阈值之后，无源Q开关至少部分地分流接收磁共振器，以减小该第二谐振器的Q，这允许在一些应用中更快地检测第二谐振器的操作。 该技术允许双模谐振器系统中的快速Q开关，特别是具有彼此正交的具有磁场的谐振器的谐振器。

公开(公告)号：US08030925B2

公开(公告)日：2011-10-04

申请号：US11717596

申请日：2007-03-12

申请人： Robert B. Hammond ,  Jonathan Z. Sun ,  Douglas J. Scalapino ,  Timothy W. James ,  Lincoln C. Bourne

发明人： Robert B. Hammond ,  Jonathan Z. Sun ,  Douglas J. Scalapino ,  Timothy W. James ,  Lincoln C. Bourne

IPC分类号： G01V3/00

CPC分类号： H01G4/008 ,  G01R33/34007 ,  G01R33/34023 ,  G01R33/34053 ,  G01R33/341 ,  G01R33/3642 ,  G01R33/3671 ,  H01F6/06 ,  H01P1/203 ,  H01P7/08 ,  H01P7/088 ,  H01Q1/364 ,  H03K17/78 ,  H03K17/92 ,  H03K2217/0036

摘要： A method of tuning a high temperature superconductor (HTS) resonator includes the steps of providing a HTS inductor and a HTS capacitor, the HTS capacitor being electrically connected to the HTS inductor. A tuning body is provided adjacent to the HTS inductor and the HTS capacitor. The relative position of the tuning body with respect to the HTS inductor and the HTS capacitor is altered so as to tune the resonator. A tunable resonant circuit is provided that includes a substrate having a planar surface. At least one resonator formed from HTS material is disposed on the substrate, the resonator having one or more turns that when combined, turn through greater than 360°.

摘要翻译： 调谐高温超导体（HTS）谐振器的方法包括提供HTS电感器和HTS电容器的步骤，HTS电容器电连接到HTS电感器。 调谐体靠近HTS电感和HTS电容。 改变调谐体相对于HTS电感器和HTS电容器的相对位置，以调谐谐振器。 提供了包括具有平坦表面的基板的可调谐谐振电路。 由HTS材料形成的至少一个谐振器设置在基板上，谐振器具有一个或多个匝，当组合时，该谐振器转过大于360°。