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    Phase controlled surface coil magnetic resonance imaging
    1.
    发明授权
    Phase controlled surface coil magnetic resonance imaging 失效
    相控面磁共振成像

    公开(公告)号：US06952100B1

    公开(公告)日：2005-10-04

    申请号：US10709354

    申请日：2004-04-29

    申请人： Graeme C. McKinnon ,  Eddy B. Boskamp ,  Shumin Wang

    发明人： Graeme C. McKinnon ,  Eddy B. Boskamp ,  Shumin Wang

    IPC分类号： G01R33/3415 ,  G01V3/00

    CPC分类号： G01R33/3415

    摘要： A magnetic resonance imaging assembly is provided. The assembly includes a magnet assembly defining a scanning bore along a z-direction. The assembly further includes a surface coil assembly positioned within the scanning bore. The surface coil assembly receives an imaging field. The surface coil assembly comprises a first surface coil positioned along the z-direction. The first surface coil is induced with a first coil current comprised of a first coil amplitude and a first coil phase. The surface coil assembly includes a second surface coil positioned along said z-direction. The second surface coil is induced with a second coil current comprised of a second coil amplitude and a second coil phase. The second coil phase is varied from the first coil phase to correct asymmetries within the imaging field.

    摘要翻译： 提供磁共振成像组件。 组件包括沿z方向限定扫描孔的磁体组件。 组件还包括位于扫描孔内的表面线圈组件。 表面线圈组件接收成像场。 表面线圈组件包括沿z方向定位的第一表面线圈。 用第一线圈振幅和第一线圈相位的第一线圈电流感应第一表面线圈。 表面线圈组件包括沿着z方向定位的第二表面线圈。 第二表面线圈由包括第二线圈振幅和第二线圈相的第二线圈电流感应。 第二线圈相位从第一线圈相位变化，以校正成像场内的不对称性。

    SYSTEM AND METHOD FOR MULTI-SPECTRAL MR IMAGING NEAR METAL
    2.
    发明申请
    SYSTEM AND METHOD FOR MULTI-SPECTRAL MR IMAGING NEAR METAL 有权
    用于多金属MR成像的系统和方法

    公开(公告)号：US20100308827A1

    公开(公告)日：2010-12-09

    申请号：US12860272

    申请日：2010-08-20

    申请人： Kevin M. Koch ,  Kevin F. King ,  Graeme C. McKinnon ,  Brian Hargreaves

    发明人： Kevin M. Koch ,  Kevin F. King ,  Graeme C. McKinnon ,  Brian Hargreaves

    IPC分类号： G01R33/48

    CPC分类号： G01R33/56563 ,  G01R33/243 ,  G01R33/4822 ,  G01R33/5608

    摘要： A system and method for multi-spectral MR imaging near metal include a computer programmed to calculate an MR pulse sequence comprising a plurality of RF pulses configured to excite spins in an imaging object and comprising a plurality of volume selection gradients and determine a plurality of distinct offset frequency values. For each respective determined offset frequency value, the computer is programmed to execute the MR pulse sequence having a central transmit frequency and a central receive frequency of the MR pulse sequence set to the respective determined offset frequency value. The computer is also programmed to acquire a three-dimensional (3D) MR data set for each MR pulse sequence execution and generate a composite image based on data from each of the acquired 3D MR data sets.

    摘要翻译： 用于金属附近的多光谱MR成像的系统和方法包括被编程为计算MR脉冲序列的计算机，该计算机包括被配置为激励成像对象中的自旋的多个RF脉冲，并且包括多个体积选择梯度并且确定多个不同的 偏移频率值。 对于每个相应确定的偏移频率值，计算机被编程为执行MR脉冲序列，该MR脉冲序列具有被设置为相应确定的偏移频率值的MR脉冲序列的中心发射频率和中心接收频率。 计算机还被编程为获取每个MR脉冲序列执行的三维（3D）MR数据集，并且基于来自每个获取的3D MR数据集的数据生成合成图像。

    Antenna for magnetic resonance imaging and method of use
    3.
    再颁专利
    Antenna for magnetic resonance imaging and method of use 有权
    磁共振成像用天线及其使用方法

    公开(公告)号：USRE40587E1

    公开(公告)日：2008-11-25

    申请号：US09804430

    申请日：2000-08-10

    申请人： Graeme C. McKinnon

    发明人： Graeme C. McKinnon

    IPC分类号： A61B5/055

    CPC分类号： G01R33/285 ,  A61B5/055 ,  A61B5/06 ,  A61M25/09

    摘要： A medical appliance for use in magnetic resonance imaging procedures. A guidewire for vascular procedures is formed by a coaxial cable acting as antenna in a magnetic resonance imaging system.

    摘要翻译： 一种用于磁共振成像程序的医疗器械。 用于血管程序的导丝由在磁共振成像系统中用作天线的同轴电缆形成。

    Method and apparatus for rapid T2 weighted MR image acquisition
    5.
    发明授权
    Method and apparatus for rapid T2 weighted MR image acquisition 有权
    用于快速T2加权MR图像采集的方法和装置

    公开(公告)号：US06239597B1

    公开(公告)日：2001-05-29

    申请号：US09417715

    申请日：1999-10-14

    申请人： Graeme C. McKinnon

    发明人： Graeme C. McKinnon

    IPC分类号： G01V300

    CPC分类号： G01R33/50

    摘要： The present invention relates to magnetic resonance imaging (MRI) and includes a method and apparatus to rapidly acquire T2 weighted MR images in a repetition time comparable to times usually associated with T1 weighted imaging. The invention also includes a pulse sequence for use with MR image acquisition to accomplish the foregoing. Two embodiments are disclosed, both of which have in common the use of a pulse sequence that has a first and second RF pulse, each RF pulse separated by an interval &tgr; and wherein the phase of the second and subsequent RF pulses is incremented linearly so as to spoil undesirable RF signal coherences so that the system can operate in steady state and acquire pure T2 weighted image in a time (TR) usually associated with T1 date acquisition.

    摘要翻译： 本发明涉及磁共振成像（MRI），并且包括以与通常与T1加权成像相关的时间相当的重复时间快速获取T2加权MR图像的方法和装置。 本发明还包括用于MR图像采集以完成上述的脉冲序列。 公开了两个实施例，这两个实施例共同地使用具有第一和第二RF脉冲的脉冲序列，每个RF脉冲以间隔＆amp; 并且其中第二和随后的RF脉冲的相位线性递增，以便破坏不期望的RF信号相干，使得系统可以在稳定状态下操作并且在通常与T1日期采集相关联的时间（TR）中获取纯T2加权图像。

    MR tomography method and apparatus for performing the method
    7.
    发明授权
    MR tomography method and apparatus for performing the method 失效
    用于执行该方法的MR断层摄影方法和装置

    公开(公告)号：US4818941A

    公开(公告)日：1989-04-04

    申请号：US936068

    申请日：1986-11-26

    申请人： Graeme C. McKinnon

    发明人： Graeme C. McKinnon

    IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/48 ,  G01R33/485 ,  G01R33/54 ,  G01R33/56 ,  G01R33/20

    CPC分类号： G01R33/4828 ,  G01R33/485 ,  G01R33/56

    摘要： An MR tomography method for generating water and fat images and an apparatus for performing the method. In one embodiment each sequence, consisting of a high-frequency pulse and different gradient fields, is executed twice, the gradient fields being influenced so that the distance between the high-frequency pulse and the echo signal in one execution of a sequence deviates from that in the other execution of the sequence by a given amount. Water images and fat images can thus be formed by summing and subtraction, respectively. In a second embodiment, two read phases are provided in each sequence.

    摘要翻译： 一种用于产生水和脂肪图像的MR断层摄影方法和用于执行该方法的装置。 在一个实施例中，由高频脉冲和不同梯度场组成的每个序列被执行两次，梯度场受到影响，使得一次执行序列中的高频脉冲与回波信号之间的距离偏离 在序列的另一个执行中给定的量。 因此，水图像和脂肪图像可以分别通过求和和形成。 在第二实施例中，在每个序列中提供两个读取相位。

    Integrated multi-modality imaging system
    8.
    发明授权
    Integrated multi-modality imaging system 失效
    综合多模态成像系统

    公开(公告)号：US06925319B2

    公开(公告)日：2005-08-02

    申请号：US10391065

    申请日：2003-03-18

    申请人： Graeme C. McKinnon

    发明人： Graeme C. McKinnon

    IPC分类号： A61B5/05 ,  A61B5/055 ,  A61B6/00 ,  A61B5/00

    CPC分类号： G01R33/4812 ,  A61B6/00 ,  A61B6/4417 ,  A61B6/5247

    摘要： An integrated, multi-modality imaging technique is disclosed. The embodiment described combines a split-magnet MRI system with a digital x-ray system. The two systems are employed together to generate images of a subject in accordance with their individual physics and imaging characteristics. The images may be displaced in real time, such as during a surgical intervention. The images may be registered with one another and combined to form a composite image in which tissues or objects difficult to image in one modality are visible. By appropriately selecting the position of an x-ray source and detector, and by programming a desired corresponding slice for MRI imaging, useful combined images may be obtained and displayed.

    摘要翻译： 公开了一种集成的多模态成像技术。 所描述的实施例将分离磁体MRI系统与数字X射线系统相结合。 这两个系统被一起使用以根据它们各自的物理和成像特征产生被摄体的图像。 图像可以实时地移位，例如在外科手术期间。 图像可以彼此登记并组合以形成合成图像，其中可以看到在一种模式中难以成像的组织或对象。 通过适当选择X射线源和检测器的位置，并且通过编程用于MRI成像的期望的对应切片，可以获得并显示有用的组合图像。

    System and method for unwrapping phase difference images
    9.
    发明授权
    System and method for unwrapping phase difference images 失效
    用于展开相位差图像的系统和方法

    公开(公告)号：US06703835B2

    公开(公告)日：2004-03-09

    申请号：US10119724

    申请日：2002-04-11

    申请人： Sarah K. Patch ,  Tejaswini Shubhachint ,  Graeme C. McKinnon ,  Sandhya Parameswaran ,  Joseph K. Maier

    发明人： Sarah K. Patch ,  Tejaswini Shubhachint ,  Graeme C. McKinnon ,  Sandhya Parameswaran ,  Joseph K. Maier

    IPC分类号： G01N300

    CPC分类号： G01R33/565 ,  G01R33/3875 ,  G01R33/56527 ,  G01R33/56563

    摘要： A method for processing digital images includes acquiring a phase difference image which includes one or more phase wraps, creating a modulated phase difference image from the phase difference image, comparing the modulated phase difference image to the phase difference image to locate areas in the phase difference image to be unwrapped, and unwrapping the phase difference image based on the areas located in the comparing step. The unwrapping step is performed by replacing wrapped pixels in the phase difference image with pixels in the modulated phase difference image plus an integer multiple of &pgr;. The integer multiplier is computed by comparing overlapping pixels in the image segments. This has a smoothing effect causing the wrapped pixels in the phase difference image to become unwrapped. As a result of this pixel replacement process, an image of improved quality and information content is produced compared with conventional methods.

    摘要翻译： 一种处理数字图像的方法包括获取包括一个或多个相位包的相位差图像，从相位差图像创建调制相位差图像，将调制相位差图像与相位差图像进行比较，以定位相位差中的区域 图像被展开，并且基于位于比较步骤中的区域展开相位差图像。 通过将相位差图像中的包围像素替换为调制相位差图像中的像素加上pi的整数倍来执行展开步骤。 通过比较图像片段中的重叠像素来计算整数乘数。 这具有使相位差图像中的被包裹的像素变得展开的平滑效果。 作为该像素替换处理的结果，与常规方法相比，产生了改善的质量和信息内容的图像。

    Method and apparatus for a pulse sequence for magnetic resonance imaging in an inhomogeneous magnetic field
    10.
    发明授权
    Method and apparatus for a pulse sequence for magnetic resonance imaging in an inhomogeneous magnetic field 失效
    用于在非均匀磁场中磁共振成像的脉冲序列的方法和装置

    公开(公告)号：US06570383B1

    公开(公告)日：2003-05-27

    申请号：US09748928

    申请日：2000-12-27

    申请人： Graeme C. McKinnon ,  Jean H. Brittain

    发明人： Graeme C. McKinnon ,  Jean H. Brittain

    IPC分类号： G01V300

    CPC分类号： G01R33/445 ,  G01R33/48 ,  G01R33/5617

    摘要： A method and system for imaging using an inhomogeneous static magnetic field is disclosed herein. The imaging includes providing the inhomogeneous static magnetic field to an object of interest located within an imaging volume. The imaging further includes providing a pulse sequence including a readout gradient pulse and a slice selection gradient pulse, both gradient pulses comprising a part of the inhomogeneous static magnetic field. The pulse sequence is configured to acquire a plurality of lines of k-space data per excitation.

    摘要翻译： 本文公开了使用非均匀静磁场成像的方法和系统。 该成像包括将不均匀的静磁场提供给位于成像体积内的感兴趣对象。 该成像还包括提供包括读出梯度脉冲和切片选择梯度脉冲的脉冲序列，两个梯度脉冲包括一部分非均匀静态磁场。 脉冲序列被配置为每次激励获取多行k空间数据。