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8 条记录 (耗时 0.018 秒)

    Method and system for remotely controlled MR-guided focused ultrasound ablation
    1.
    发明申请
    Method and system for remotely controlled MR-guided focused ultrasound ablation 审中-公开
    用于远程控制MR导向聚焦超声消融的方法和系统

    公开(公告)号：US20080161784A1

    公开(公告)日：2008-07-03

    申请号：US11588043

    申请日：2006-10-26

    申请人： Joseph M. Hogan ,  Giora Sat ,  David M. Goldhaber

    发明人： Joseph M. Hogan ,  Giora Sat ,  David M. Goldhaber

    IPC分类号： A61B18/04 ,  A61B5/05

    CPC分类号： A61N7/02 ,  A61B5/055 ,  A61B2017/00084 ,  A61B2090/374 ,  G01R33/28 ,  G01R33/4804 ,  G01R33/4814

    摘要： A remotely controlled magnetic resonance guided focused ultrasound system includes a magnetic resonance scanner and focused ultrasound transducer assembly at a location where a patient is to be treated, and a control station which is not immediately at the location where the patient is to be treated. The control station may be remote from the patient location, and connected to the scanner and the transducer assembly via a network. A local controller aids in acquiring magnetic resonance guide images and thermographic images during sonication. The sonication itself is controlled remotely by a surgeon by the control station.

    摘要翻译： 远程控制的磁共振引导聚焦超声系统包括在待治疗的位置处的磁共振扫描器和聚焦超声换能器组件，以及不立即在待治疗患者的位置处的控制站。 控制站可以远离患者位置，并且经由网络连接到扫描器和换能器组件。 超声处理时，本地控制器有助于获取磁共振引导图像和热成像图像。 超声处理本身由外科医生由控制站远程控制。

    Apparatus and method for stabilizing the background magnetic field during MRI
    2.
    发明授权
    Apparatus and method for stabilizing the background magnetic field during MRI 失效
    MRI检测背景磁场的装置及方法

    公开(公告)号：US5245286A

    公开(公告)日：1993-09-14

    申请号：US702428

    申请日：1991-05-20

    申请人： Joseph W. Carlson ,  David M. Goldhaber

    发明人： Joseph W. Carlson ,  David M. Goldhaber

    IPC分类号： A61B5/055 ,  G01R33/387 ,  G01R33/3875 ,  G01R33/389 ,  G01R33/56 ,  G01R33/565

    CPC分类号： G01R33/389 ,  G01R33/56563

    摘要： A pair of serially-connected coils detect noise variations in an MRI background magnetic field. Although the coils are closely coupled to the primary background magnetic field generator of the MRI system, they are disposed so as to be substantially de-coupled from rapidly changing MRI gradient magnetic fields. The noise detecting loops drive a negative feedback loop including a low pass filter, amplifier and controlled current source driving a large correcting loop. The device attenuates background magnetic field noise during MRI data acquisition over a frequency band extending from a few millihertz to more than 100 Hz. It is preferably used with existing field stabilization software that otherwise compensates for fluctuations in an overlapping frequency band which starts at d.c. Thus, when used together, background magnetic field noise may be attenuated (or compensated for in subsequent MRI data processing) over a frequency band that extends from d.c. to more than 100 Hz.

    摘要翻译： 一对串联线圈检测MRI背景磁场中的噪声变化。 虽然线圈紧密耦合到MRI系统的主要背景磁场发生器，但是它们被布置成与快速变化的MRI梯度磁场基本上脱耦合。 噪声检测环路驱动负反馈回路，包括低通滤波器，放大器和驱动大校正环路的受控电流源。 该装置在从几毫赫到多于100赫兹的频带上的MRI数据采集期间衰减背景磁场噪声。 它优选与现有的场稳定软件一起使用，否则补偿以直流开始的重叠频带中的波动。 因此，当一起使用时，背景磁场噪声可以在从直流延伸的频带上衰减（或在随后的MRI数据处理中补偿）。 超过100 Hz。

    Correction for field variation in steady-state MRI by repeated acquisition of zero k-space line
    3.
    发明授权
    Correction for field variation in steady-state MRI by repeated acquisition of zero k-space line 失效
    通过重复采集零k空间线来校正稳态MRI中的场变化

    公开(公告)号：US5652514A

    公开(公告)日：1997-07-29

    申请号：US621240

    申请日：1996-03-25

    申请人： Weiguo Zhang ,  David M. Kramer ,  David M. Goldhaber

    发明人： Weiguo Zhang ,  David M. Kramer ,  David M. Goldhaber

    IPC分类号： G01R33/54 ,  A61B5/055 ,  G01R33/565 ,  G01V3/00

    CPC分类号： G01R33/56563

    摘要： Methods and apparatus for correcting image artefacts caused by variations in the main magnetic field of an MRI system are disclosed, particularly for MRI with steady-state spin precession. For field correction in MRI with steady-state spin precession, the effects of the field changes can be corrected by quantifying the time course of the field drifts by repeated acquisition of the zero k-space lines. The change in the phase between consecutive zero k-space lines is used as an indicator of field variation and for correction of associated image artifacts. By using for field correction the zero k-space lines acquired using the imaging sequence itself, the steady-states of spin precession are undisturbed throughout the MRI data acquisition.

    摘要翻译： 公开了用于校正由MRI系统的主磁场的变化引起的图像伪像的方法和装置，特别是对于具有稳态旋转进动的MRI。 对于具有稳态自旋进动的MRI中的场校正，可以通过重复采集零k空间线来量化场漂移的时间过程来校正场变化的影响。 使用连续零k空间线之间的相位变化作为场变化的指示符和用于校正相关联的图像伪像。 通过使用场校正，使用成像序列本身获取的零k空间线，自旋进动的稳态在整个MRI数据采集期间不受干扰。

    RF body coil with acoustic isolation of conductors
    6.
    发明授权
    RF body coil with acoustic isolation of conductors 有权
    RF体线圈与导体隔声

    公开(公告)号：US07671593B2

    公开(公告)日：2010-03-02

    申请号：US11424293

    申请日：2006-06-15

    申请人： David M. Goldhaber ,  Darren Lee Hallman ,  Anton Max Linz

    发明人： David M. Goldhaber ,  Darren Lee Hallman ,  Anton Max Linz

    IPC分类号： G01V3/00

    CPC分类号： G01R33/34046 ,  G01R33/288 ,  G01R33/341

    摘要： A system for isolating vibration and reducing acoustic noise in the RF coil of an MR imaging apparatus is presented. The system positions an RF conductor in its operative position proximate to an RF support form. The RF conductor is sandwiched between a vibration decoupling layer and a mass loading layer. The vibration decoupling layer is affixed to the RF support form so that the vibration decoupling layer is positioned between the RF conduit and the RF support form while the mass loading layer is located exterior of the RF conductor. By this arrangement, the acoustic energy is decoupled from the RF support form by the vibration decoupling layer while the vibration is reduced by the mass loading layer located exterior of the RF conductor.

    摘要翻译： 提出了一种用于隔离MR成像设备的RF线圈振动和降低声学噪声的系统。 该系统将RF导体定位在靠近RF支持形式的其操作位置。 RF导体夹在振动解耦层和质量加载层之间。 振动解耦层被固定到RF支撑形式，使得振动解耦层位于RF导管和RF支撑形式之间，而质量加载层位于RF导体的外部。 通过这种布置，声能通过振动解耦层从RF支撑形式解耦，同时通过位于RF导体外部的质量加载层减小振动。

    RF BODY COIL WITH ACOUSTIC ISOLATION OF CONDUCTORS
    7.
    发明申请
    RF BODY COIL WITH ACOUSTIC ISOLATION OF CONDUCTORS 有权
    射频身体线圈与导电体的声学隔离

    公开(公告)号：US20070290686A1

    公开(公告)日：2007-12-20

    申请号：US11424293

    申请日：2006-06-15

    申请人： David M. Goldhaber ,  Darren Lee Hallman ,  Anton Max Linz

    发明人： David M. Goldhaber ,  Darren Lee Hallman ,  Anton Max Linz

    IPC分类号： G01V3/00

    CPC分类号： G01R33/34046 ,  G01R33/288 ,  G01R33/341

    摘要： A system for isolating vibration and reducing acoustic noise in the RF coil of an MR imaging apparatus is presented. The system positions an RF conductor in its operative position proximate to an RF support form. The RF conductor is sandwiched between a vibration decoupling layer and a mass loading layer. The vibration decoupling layer is affixed to the RF support form so that the vibration decoupling layer is positioned between the RF conduit and the RF support form while the mass loading layer is located exterior of the RF conductor. By this arrangement, the acoustic energy is decoupled from the RF support form by the vibration decoupling layer while the vibration is reduced by the mass loading layer located exterior of the RF conductor.

    摘要翻译： 提出了一种用于隔离MR成像设备的RF线圈振动和降低声学噪声的系统。 该系统将RF导体定位在靠近RF支持形式的其操作位置。 RF导体夹在振动解耦层和质量加载层之间。 振动解耦层被固定到RF支撑形式，使得振动解耦层位于RF导管和RF支撑形式之间，而质量加载层位于RF导体的外部。 通过这种布置，声能通过振动解耦层从RF支撑形式解耦，同时通过位于RF导体外部的质量加载层减小振动。