利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

640 条记录 (耗时 0.025 秒)

    MASSIVELY PARALLEL MAGNETIC RESONANCE IMAGING WHEREIN NUMEROUS OFF-SURFACE COILS ARE USED TO ACQUIRE PARTIALLY UNDER-SAMPLED MAGNETIC RESONANCE SIGNAL DATA
    22.
    发明申请
    MASSIVELY PARALLEL MAGNETIC RESONANCE IMAGING WHEREIN NUMEROUS OFF-SURFACE COILS ARE USED TO ACQUIRE PARTIALLY UNDER-SAMPLED MAGNETIC RESONANCE SIGNAL DATA 审中-公开

    公开(公告)号：US20190041481A1

    公开(公告)日：2019-02-07

    申请号：US15668742

    申请日：2017-08-04

    申请人： Muralidhara Subbarao

    发明人： Muralidhara Subbarao

    IPC分类号： G01R33/561 ,  G01R33/341

    摘要： A system and three methods are provided for massively parallel Magnetic Resonance Imaging of an object. They are based on using numerous, perhaps hundreds of, radio frequency receiver coils that measure Magnetic Resonance (MR) signal. In particular, the receiver coils are arranged both on-surface, i.e. relatively close and roughly parallel to the object surface, as well as off-surface, i.e. relatively distant or at a significant angle, such as 45 or 90 degrees, with respect to the object surface. The coils are arranged in a three-dimensional volume space at different positions, orientations, and distances, possibly in multiple layers. Each receiver coil is associated with a sensitivity map and provides partially under-sampled MR signal data with respect to frequency, phase, or k-space. The data from all coils are combined, using all the sensitivity maps in the image space or k-space, to obtain over-sampled data which is processed to reconstruct an unaliased image.

    Circuits for magnetic resonance imaging systems for integrated parallel reception, excitation, and shimming
    24.
    发明授权
    Circuits for magnetic resonance imaging systems for integrated parallel reception, excitation, and shimming 有权

    公开(公告)号：US10185001B2

    公开(公告)日：2019-01-22

    申请号：US15838888

    申请日：2017-12-12

    申请人： Duke University

    发明人： Hui Han ,  Trong-Kha Truong ,  Allen W. Song

    IPC分类号： G01R33/3875 ,  G01R33/341 ,  G01R33/36 ,  G01R33/345 ,  G01R33/565

    摘要： Systems, methods and devices are configured for integrated parallel reception, excitation, and shimming (iPRES). Parallel transmit/receive (which can include B1 shimming and/or parallel imaging capabilities) and B0 shimming employ the same set of localized coils or transverse electromagnetic (TEM) coil elements, with each coil or TEM element working in both an RF mode (for transmit/receive and B1 shimming) and a direct current (DC) mode (for B0 shimming) simultaneously. Both an RF and a DC current can flow in the same coil simultaneously but independently with no electromagnetic interference between the two modes. This invention is not only applicable when the same coil array is used for parallel transmit, receive and shim, but also when two separate coil arrays are used. In that case, the B0 shimming capability can be integrated into one of the coil arrays (i.e. a transmit array with B1 shimming capability or a receive array), thereby increasing the flexibility and practical utility of the iPRES technology.

    Detuning a MRT receive antenna
    28.
    发明授权
    Detuning a MRT receive antenna 有权

    公开(公告)号：US10145912B2

    公开(公告)日：2018-12-04

    申请号：US15131201

    申请日：2016-04-18

    申请人： Klaus Huber ,  Robert Rehner ,  Markus Vester

    发明人： Klaus Huber ,  Robert Rehner ,  Markus Vester

    IPC分类号： G01R33/36 ,  G01R33/341

    摘要： An arrangement for detuning a receive antenna, a detunable magnetic resonance coil, and a magnetic resonance device having a detunable magnetic resonance coil are provided. The arrangement includes a receive antenna having at least one first capacitance, wherein radiofrequency signals from a magnetic resonance examination may be received by way of the receive antenna. The arrangement furthermore includes a switchable detuning circuit containing the first capacitance switched to form an oscillating circuit and a first inductance, and a switching device having a first and a second connection point to deliver a voltage between the first and a second connection point, and one or more transistors. The switching device switches the oscillating circuit to a high impedance level with aid of the one or more transistors on delivery of a positive voltage to the first connection point, preventing a radiofrequency signal from being received by way of the receive antenna.

    NMR logging apparatus
    29.
    发明授权
    NMR logging apparatus 有权

    公开(公告)号：US10113982B2

    公开(公告)日：2018-10-30

    申请号：US14054361

    申请日：2013-10-15

    申请人： VISTA CLARA INC.

    发明人： David O. Walsh ,  Peter Turner

    IPC分类号： G01V3/32 ,  G01N24/08 ,  G01R33/36 ,  G01R33/341 ,  G01R33/38

    摘要： Technologies including NMR logging apparatus and methods are disclosed. Example NMR logging apparatus may include surface instrumentation and one or more downhole probes configured to fit within an earth borehole. The surface instrumentation may comprise a power amplifier, which may be coupled to the downhole probes via one or more transmission lines, and a controller configured to cause the power amplifier to generate a NMR activating pulse or sequence of pulses. Impedance matching means may be configured to match an output impedance of the power amplifier through a transmission line to a load impedance of a downhole probe. Methods may include deploying the various elements of disclosed NMR logging apparatus and using the apparatus to perform NMR measurements.