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    Magnetic resonance method and apparatus wherein signal contributions outside of the measurement region are reduced
    83.
    发明授权
    Magnetic resonance method and apparatus wherein signal contributions outside of the measurement region are reduced 有权

    公开(公告)号：US09726743B2

    公开(公告)日：2017-08-08

    申请号：US14173176

    申请日：2014-02-05

    申请人： Hans-Peter Fautz

    发明人： Hans-Peter Fautz

    IPC分类号： G01V3/00 ,  G01R33/561 ,  G01R33/483

    CPC分类号： G01R33/561 ,  G01R33/4836 ,  G01R33/4838 ,  G01R33/5613

    摘要： In magnetic resonance imaging using a measurement sequence of the “free precession of transverse magnetization in the steady state”-type i.e., an SSFP measurement sequence, during the SSFP measurement sequence, the implementation of a preparation sequence takes place to reduce a signal contribution of the transverse magnetization in an outer region surrounding a measurement region in the MR imaging. The implementation of the preparation sequence includes the radiation of a multidimensional, spatially selective RF pulse that acts in a spatially selective manner on the transverse magnetization in the outer region. Saturation of the transverse magnetization and/or dephasing of the transverse magnetization in the outer region can be achieved by the multidimensional, spatially selective RF pulse.

    Magnetic resonance imaging using randomized radio frequency pulses
    86.
    发明授权
    Magnetic resonance imaging using randomized radio frequency pulses 有权
    使用随机射频脉冲的磁共振成像

    公开(公告)号：US09285445B2

    公开(公告)日：2016-03-15

    申请号：US13444806

    申请日：2012-04-11

    申请人： Eric C. Wong

    发明人： Eric C. Wong

    IPC分类号： G01R33/50 ,  G01R33/483

    CPC分类号： G01R33/4836 ,  G01R33/50

    摘要： Methods, systems and apparatus for magnetic resonance imaging that facilitate applying a gradient waveform to generate a k-space trajectory in a subject, applying radio frequency (RF) pulses having a pseudorandom phase distribution, such that the RF pulses are applied to the subject at a plurality of non-uniform locations near a center of the k-space trajectory and collecting, based on the applied RF pulses and the applied gradient waveform, imaging data from the subject.

    摘要翻译： 用于磁共振成像的方法，系统和装置，其有助于施加梯度波形以在对象中产生k空间轨迹，施加具有伪随机相位分布的射频（RF）脉冲，使得RF脉冲被施加到受试者 在k空间轨迹的中心附近的多个非均匀位置，并且基于所施加的RF脉冲和所施加的梯度波形收集来自对象的成像数据。

    Determination of a magnetic resonance system control sequence
    87.
    发明授权
    Determination of a magnetic resonance system control sequence 有权
    确定磁共振系统控制序列

    公开(公告)号：US09274195B2

    公开(公告)日：2016-03-01

    申请号：US13847680

    申请日：2013-03-20

    申请人： Josef Pfeuffer ,  Rainer Schneider

    发明人： Josef Pfeuffer ,  Rainer Schneider

    IPC分类号： G01V3/00 ,  G01R33/54 ,  G01R33/28 ,  G01R33/483 ,  G01R33/561

    CPC分类号： G01R33/543 ,  G01R33/28 ,  G01R33/4833 ,  G01R33/4836 ,  G01R33/5612

    摘要： In method and a control sequence determination device to determine a magnetic resonance system control sequence that includes at least one radio-frequency pulse train to be emitted by a magnetic resonance system, a target magnetization (m) is initially detected, and an energy distribution function in k-space is determined on the basis of the target magnetization. A k-space trajectory is then determined under consideration of the energy distribution function in k-space, for which the radio-frequency pulse train is then determined in an RF pulse optimization method. The method is suitable for operation of a magnetic resonance system, and a magnetic resonance system includes such a control sequence determination device.

    摘要翻译： 在方法和控制序列确定装置中，确定包括由磁共振系统发射的至少一个射频脉冲串的磁共振系统控制序列，最初检测目标磁化（m），并且能量分布函数 基于目标磁化确定k空间。 然后考虑k空间中的能量分布函数来确定k空间轨迹，然后在RF脉冲优化方法中确定射频脉冲序列。 该方法适用于磁共振系统的操作，并且磁共振系统包括这样的控制顺序确定装置。

    MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD
    88.
    发明申请
    MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD 有权
    磁共振成像装置和磁共振成像方法

    公开(公告)号：US20150260815A1

    公开(公告)日：2015-09-17

    申请号：US14418246

    申请日：2013-09-10

    申请人： HITACHI MEDICAL CORPORATION

    发明人： Takashi Nishihara ,  Hiroyuki Itagaki

    IPC分类号： G01R33/483 ,  G01R33/385 ,  G01R33/36 ,  G01R33/561 ,  G01R33/54

    CPC分类号： G01R33/4836 ,  A61B5/055 ,  G01R33/36 ,  G01R33/385 ,  G01R33/543 ,  G01R33/546 ,  G01R33/561

    摘要： In order to provide a technique for improving image quality by selectively exciting only a target region with high precision in either of a two-dimensional spatial selective excitation method or a three-dimensional spatial selective excitation method, selecting a k-space trajectory restraining excitation in a non-target region by side lobes is received. At this time, an excitation region of the selected k-space trajectory is presented to an operator, and the operator can adjust the excitation region through the display. After the adjustment of the excitation region by the operator is reflected, a multi-dimensional spatial selective excitation pulse is stabilized.

    摘要翻译： 为了提供一种通过在二维空间选择激励法或三维空间选择激励法中的任一种选择性地激发仅具有目标区域的目标区域来提高图像质量的技术，选择k-空间轨迹抑制激励 接收非目标区域旁瓣。 此时，将所选择的k空间轨迹的激励区域呈现给操作者，并且操作者可以通过显示器调节激发区域。 在由操作者调节激励区域之后，多维空间选择激励脉冲被稳定。

    METHOD TO GENERATE AN RF EXCITATION PULSE TO EXCITE AN ARBITRARILY SHAPED VOLUME, METHOD FOR TARGETED EXCITATION OF SPINS WITHIN A VESSEL, AND METHOD TO CREATE MR ANGIOGRAPHY IMAGES, AND MAGNETIC RESONANCE SYSTEM
    89.
    发明申请
    METHOD TO GENERATE AN RF EXCITATION PULSE TO EXCITE AN ARBITRARILY SHAPED VOLUME, METHOD FOR TARGETED EXCITATION OF SPINS WITHIN A VESSEL, AND METHOD TO CREATE MR ANGIOGRAPHY IMAGES, AND MAGNETIC RESONANCE SYSTEM 有权
    生成射频激发脉冲以产生ARBITRARILY形状体积的方法，用于在血管中靶向激发旋转的方法，以及创建MR血管成像的方法和磁共振系统

    公开(公告)号：US20140159722A1

    公开(公告)日：2014-06-12

    申请号：US14099034

    申请日：2013-12-06

    申请人： Hans-Peter Fautz

    发明人： Hans-Peter Fautz

    IPC分类号： A61B5/055 ,  G01R33/48

    CPC分类号： A61B5/055 ,  A61B5/004 ,  G01R33/48 ,  G01R33/4836 ,  G01R33/5635 ,  G01R33/56366

    摘要： In order to generate an RF excitation pulse together with a gradient curve to excite nuclear spins an arbitrarily shaped volume with a magnetic resonance system, a volume segment is prepared in which the volume is situated, such that only spins within the volume yield an MR signal portion in the subsequent detection of an MR signal. An MR signal is detected from the volume segment along a trajectory of k-space. At least one gradient for scanning k-space along the trajectory is switched during the detection. The RF excitation pulse is generated corresponding to the MR signal detected in a temporally inverted manner, and the gradient curve is generated corresponding to the temporally inverted curve of the at least one gradient to scan k-space.

    摘要翻译： 为了产生RF激励脉冲与梯度曲线一起使用磁共振系统激发具有任意形状的体积的体积，制备体积位于其中的体积段，使得仅在体积内的自旋产生MR信号 随后检测MR信号的部分。 沿着k空间的轨迹从卷段检测MR信号。 在检测期间切换至少一个沿着轨迹扫描k空间的梯度。 产生对应于以时间反转方式检测到的MR信号的RF激励脉冲，并且对应于扫描k空间的至少一个梯度的时间上颠倒的曲线产生梯度曲线。

    Method and system for designing excitation pulses for magnetic resonance imaging
    90.
    发明授权
    Method and system for designing excitation pulses for magnetic resonance imaging 有权
    用于设计磁共振成像激发脉冲的方法和系统

    公开(公告)号：US08749234B2

    公开(公告)日：2014-06-10

    申请号：US13015665

    申请日：2011-01-28

    申请人： William Grissom

    发明人： William Grissom

    IPC分类号： G01V3/00

    CPC分类号： G01R33/4836

    摘要： Methods and systems for designing excitation pulses for magnetic resonance imaging are provided. One method includes parameterizing spin-domain rotation parameters to define parameterized variables and defining a constrained optimization problem based on the parameterized variables. The method also includes solving the constrained optimization problem and generating parameters for the RF pulses based on the solved problem, wherein the RF pulses are one of multidimensional RF pulses on non-constant gradient trajectories or one dimensional RF pulses on non-constant gradient trajectories.

    摘要翻译： 提供了用于设计用于磁共振成像的激发脉冲的方法和系统。 一种方法包括参数化自旋域旋转参数以定义参数化变量，并基于参数化变量定义约束优化问题。 该方法还包括解决约束优化问题并基于解决的问题产生RF脉冲的参数，其中RF脉冲是非恒定梯度轨迹上的多维RF脉冲之一或非恒定梯度轨迹上的一维RF脉冲。