公开(公告)号：US08633693B2

公开(公告)日：2014-01-21

申请号：US12594341

申请日：2008-04-02

Applicant: Louis-Serge Bouchard ,  Alexander Pines ,  Vasiliki Demas

Inventor： Louis-Serge Bouchard ,  Alexander Pines ,  Vasiliki Demas

IPC: G01V3/00

CPC classification number: G01R33/48 ,  G01R33/445 ,  G01R33/483 ,  G01R33/4833 ,  G01R33/56341 ,  G01R33/56581

Abstract: A system and method for Fourier encoding a nuclear magnetic resonance (NMR) signal is disclosed. A static magnetic field B0 is provided along a first direction. An NMR signal from the sample is Fourier encoded by applying a rotating-frame gradient field BG superimposed on the B0, where the BG comprises a vector component rotating in a plane perpendicular to the first direction at an angular frequency ω in a laboratory frame. The Fourier-encoded NMR signal is detected.

Abstract translation: 公开了一种用于傅里叶编码核磁共振（NMR）信号的系统和方法。 沿着第一方向设置静磁场B0。 来自样本的NMR信号通过施加叠加在B0上的旋转帧梯度场BG进行傅里叶编码，其中BG包括在实验室框架中以角频率ω在垂直于第一方向的平面中旋转的矢量分量。 检测傅里叶编码的NMR信号。

公开(公告)号：US20130285654A1

公开(公告)日：2013-10-31

申请号：US13456739

申请日：2012-04-26

Applicant: THORSTEN FEIWEIER ,  MARTIN HARDER ,  JOHN KIRSCH ,  WILFRIED LANDSCHUETZ ,  ANDREAS SCHMIDT ,  KATRIN WOHLFARTH

Inventor： THORSTEN FEIWEIER ,  MARTIN HARDER ,  JOHN KIRSCH ,  WILFRIED LANDSCHUETZ ,  ANDREAS SCHMIDT ,  KATRIN WOHLFARTH

IPC: G01R33/56 ,  G01R33/34

CPC classification number: A61B5/055 ,  G01R33/4833 ,  G01R33/543 ,  G01R33/56563

Abstract: In a method and apparatus to generate a magnetic resonance (MR) image in a volume of interest of an examination subject, the magnetization is excited in an additional volume in the subject by at least one RF pulse, in order to achieve a desired magnetization in the volume of interest. The additional excitation volume differs at least partially from the volume of interest. For this purpose, at least one MR overview image of the examination subject is analyzed automatically to determine a position of at least one anatomical structure of the examination subject, from which the volume of interest is automatically determined. The additional excitation volume is automatically determined using the position of the at least one anatomical structure. The MR image in the volume of interest is acquired with excitation of the magnetization in the automatically determined additional excitation volume.

Abstract translation: 在用于在检查对象感兴趣的体积中产生磁共振（MR）图像的方法和装置中，通过至少一个RF脉冲在受试者的附加体积中激发磁化，以便实现期望的磁化 感兴趣的数量。 额外的励磁体积至少部分地与感兴趣的体积不同。 为此，自动分析检查对象的至少一个MR概述图像，以确定检查对象的至少一个解剖结构的位置，从该位置自动确定感兴趣的体积。 使用至少一个解剖结构的位置自动确定附加激发体积。 感兴趣体积中的MR图像在自动确定的附加激发体积中的磁化的激发获得。

公开(公告)号：US08547101B2

公开(公告)日：2013-10-01

申请号：US13123299

申请日：2009-07-22

Applicant: Satoshi Hirata ,  Yoshitaka Bito

Inventor： Satoshi Hirata ,  Yoshitaka Bito

IPC: G01V3/00

CPC classification number: G01R33/485 ,  G01R33/4833 ,  G01R33/5617

Abstract: In MRS measurement using magnetic resonance highly precise results are efficiently obtained with coincidence of axes with axes in positioning image. In measurement according to the PRESS method for a plurality of regions each localized (specified) with a set of perpendicularly intersecting three slices, wherein one or two slices are common to the sets of three slices localizing the regions, and slices not common do not intersect, a slice not common to those of a region to be selectively excited is excited with a radio frequency magnetic field of which phase is different by 180 degrees from that of a radio frequency magnetic field used for exciting the region to be selectively excited a number of times equal to the number of common slices, and during the measurement of the region to be selectively excited, a group of regions other than the region to be selectively excited are thermally equilibrated.

Abstract translation: 在使用磁共振的MRS测量中，通过定位图像中的轴与轴的重合而有效地获得高精度结果。 在根据PRESS方法对多个区域进行测量，每个区域具有一组垂直相交的三个片段（指定），其中一个或两个切片对于定位该区域的三个切片的组是共同的，并且不共同的切片不相交 与被选择性地激励的区域不共同的切片被与用于激励该区域的射频磁场的相位相差180度的射频磁场激发，以选择性地激发多个 时间等于公共切片的数量，并且在要选择性激发的区域的测量期间，除了要选择性激发的区域之外的一组区域被热平衡。

公开(公告)号：US20130144156A1

公开(公告)日：2013-06-06

申请号：US13698480

申请日：2010-05-21

Applicant: Nicolas Boulant

Inventor： Nicolas Boulant

IPC: A61B5/055

CPC classification number: A61B5/055 ,  G01R33/4833 ,  G01R33/5612 ,  G01R33/56563 ,  G01R33/5659

Abstract: A method of performing nuclear magnetic resonance imaging of a body, comprising: immerging said body in a static magnetic field for aligning nuclear spins along a magnetization axis; exposing said body to a gradient pulse and to a transverse radio-frequency pulse for performing slice-selective excitation of said nuclear spins, thus flipping the nuclear spins of atoms contained within a slice of said body; detecting a signal emitted by excited nuclear spins; and reconstructing a magnetic resonance image of said slice of the body on the basis of the detected signal; the method being characterized in that said radio-frequency pulse is constituted by a train of slice-selective elementary pulses, approximately equivalent to a train of elementary rectangular pulses with constant frequencies which are designed for compensating for inhomogeneity of the radio-frequency field within the body.

Abstract translation: 一种对身体进行核磁共振成像的方法，包括：将所述身体浸入静磁场中以沿着磁化轴对准核自旋; 将所述身体暴露于梯度脉冲和横向射频脉冲，以执行所述核自旋的切片选择性激发，从而翻转包含在所述身体的切片内的原子核旋转; 检测激发的核自旋发出的信号; 以及基于检测到的信号重构所述身体的所述切片的磁共振图像; 该方法的特征在于，所述射频脉冲由一系列切片选择性基本脉冲构成，大致相当于一系列具有恒定频率的基本矩形脉冲串，其被设计用于补偿该频率范围内的射频场的不均匀性 身体。

公开(公告)号：US20130038327A1

公开(公告)日：2013-02-14

申请号：US13571639

申请日：2012-08-10

Applicant: Hans-Peter Fautz

Inventor： Hans-Peter Fautz

IPC: G01R33/48

CPC classification number: G01R33/4833 ,  G01R33/56563 ,  G01R33/5659

Abstract: In a method to acquire a magnetic resonance image data set of a target volume with a magnetic resonance device, wherein the target volume is composed of a number of sub-volumes defined in a two-dimensional plane orthogonal to the readout direction, for each sub-volume, in order to acquire a partial data set of a sub-volume, a targeted excitation of the sub-volume and a data acquisition from that sub-volume to measure the partial data set take place by radiation of a first radio-frequency pulse acting in a first direction of the plane and radiation of a second radio-frequency pulse acting in a second direction that is orthogonal to the first direction. The partial data sets are combined into the magnetic resonance data set.

Abstract translation: 在利用磁共振装置获取目标体积的磁共振图像数据组的方法中，目标体积由在与读出方向正交的二维平面中定义的多个子体积构成，对于每个子 - 体积，为了获取子体积的部分数据集，子体积的目标激励和从该子体积进行数据采集以测量部分数据集通过第一射频辐射 在所述平面的第一方向上起作用的脉冲和在与所述第一方向正交的第二方向上作用的第二射频脉冲的辐射。 将部分数据组合成磁共振数据集。

公开(公告)号：US20130033264A1

公开(公告)日：2013-02-07

申请号：US13646205

申请日：2012-10-05

Applicant: TOSHIBA MEDICAL SYSTEMS CORPORATION ,  KABUSHIKI KAISHA TOSHIBA

Inventor： Satoshi SUGIURA

IPC: G01R33/32

CPC classification number: G01R33/543 ,  A61B5/0263 ,  A61B5/055 ,  A61B5/7285 ,  A61B5/742 ,  G01R33/307 ,  G01R33/3607 ,  G01R33/385 ,  G01R33/4818 ,  G01R33/4828 ,  G01R33/4833 ,  G01R33/54 ,  G01R33/546 ,  G01R33/5602 ,  G01R33/5607 ,  G01R33/563 ,  G01R33/56308 ,  G01R33/5635 ,  G01R33/56366 ,  G01R33/5673 ,  G01R33/5676

Abstract: According to a Magnetic Resonance Imaging (MRI) apparatus, a scanning-parameter limit calculating unit creates examination information that represents scanning conditions for collection of magnetic resonance signal data based on scanning parameters set by an operator; a scanning-condition edit/scan positioning unit creates a time chart that indicates the type and a sequential execution order of an event to be executed when collecting magnetic resonance signal data based on the examination information created by the scanning-parameter limit calculating unit, and causes a time-chart display unit to display the created time chart.

公开(公告)号：US08368400B2

公开(公告)日：2013-02-05

申请号：US12382202

申请日：2009-03-11

Applicant: Martin Haas ,  Maxim Zaitsev ,  Jürgen Hennig

Inventor： Martin Haas ,  Maxim Zaitsev ,  Jürgen Hennig

IPC: G01V3/00

CPC classification number: G01R33/483 ,  G01R33/4833 ,  G01R33/4836 ,  G01R33/543 ,  G01R33/5611 ,  G01R33/5612 ,  G01R33/5613 ,  G01R33/5617

Abstract: A magnetic resonance method for using radio frequency pulses for spatially selective and frequency selective or multidimensionally spatially selective excitation of an ensemble of nuclear spins with an initial distribution of magnetization in a main magnetic field aligned along a z-axis, wherein a spin magnetization with a given target distribution of magnetization is generated, and for refocusing the spin magnetization, is characterized in that the radio frequency pulse is used as a sequence of sub-pulses of independent duration, courses of gradients and spatial and/or spectral resolution, comprising one or more large angle RF pulses with tip angles greater than or approximately equal to 15°, which generate a gross distribution of magnetization approximating the target distribution of magnetization or a desired modification of the distribution of magnetization with a mean deviation less than or approximately equal to 15°, wherein the actual effect of the LAPs on the distribution of spin magnetization before the radio frequency pulse is used is calculated by integration of the Bloch equations without small angle approximation, and one or more small angle RF pulses=SAPs with tip angles less than or approximately equal to 15° reducing the difference between the target distribution of magnetization and the gross distribution of magnetization caused by the LAPs.

Abstract translation: 一种磁共振方法，用于使用射频脉冲用于沿着z轴对准的主磁场中的初始磁化分布的核自旋组合的空间选择性或频率选择性或多维空间选择性激发，其中自旋磁化与 产生磁化的目标分布，并且对于重新聚焦自旋磁化，其特征在于射频脉冲被用作独立持续时间，梯度，空间和/或光谱分辨率的子脉冲序列，包括一个或 具有大于或大约等于15°的尖角的更大的角度RF脉冲，其产生近似磁化的目标分布的磁化的总体分布或磁化分布的期望修改，平均偏差小于或等于15 °，其中LAP对分布的实际效果 使用无线电频率脉冲之前的自旋磁化是通过不使用小角度近似的Bloch方程的积分计算的，并且一个或多个小角度RF脉冲=具有小于或等于15°的尖角的SAP减少目标分布之间的差异 的磁化和由LAP引起的磁化的总分布。

公开(公告)号：US20120262171A1

公开(公告)日：2012-10-18

申请号：US13443908

申请日：2012-04-11

Applicant: Hans Weber ,  Maxim Zaitsev ,  Daniel Gallichan ,  Juergen Hennig

Inventor： Hans Weber ,  Maxim Zaitsev ,  Daniel Gallichan ,  Juergen Hennig

IPC: G01R33/54

CPC classification number: G01R33/4833 ,  G01R33/483 ,  G01R33/4835 ,  G01R33/4836

Abstract: A method of MR imaging applies a magnetic field Bgrad1 having a spatially non-linear dependence to select a volume of at least one curved slice. The slice is described by its midsurface AM, a volume of the selected slice being made up of nν partial volumes in each of which gradients of at least one pair of remaining superimposed magnetic fields Bgradi (i>1) exhibit an angle dependence of 70° to 110° with respect to one another and with respect to the normal of the midsurface AM. At least one superimposed magnetic field of the respective pair exhibits a spatially non-linear dependence and combinations of these pairs are used for spatial encoding. In this way, curved surfaces can be mapped efficiently in high resolution and the method can be adapted to the slice shape.

Abstract translation: MR成像的方法应用具有空间非线性依赖性的磁场Bgrad1来选择至少一个弯曲切片的体积。 切片由其中心面AM描述，所选切片的体积由n＆ngr组成; 至少一对剩余叠加磁场Bgradi（i> 1）的梯度中的每一个的部分体积相对于彼此表现出70°至110°的角度依赖性，并且相对于中空面AM的法线呈现角度依赖性。 相应对的至少一个叠加的磁场表现出空间非线性相关性，并且这些对的组合用于空间编码。 以这种方式，可以高分辨率地有效地映射曲面，并且该方法可以适应于切片形状。

公开(公告)号：US20120153950A1

公开(公告)日：2012-06-21

申请号：US13390618

申请日：2010-08-05

Applicant: Ulrich Katscher

Inventor： Ulrich Katscher

IPC: G01R33/44

CPC classification number: G01R33/5612 ,  G01R33/4824 ,  G01R33/4833 ,  G01R33/4836 ,  G01R33/5659

Abstract: A radio-frequency (RF) shimming apparatus (50) for use in a magnetic resonance imaging (MRI) system (10) comprises of a spatial sensitivity unit (30) which determines a transmit spatial sensitivity distribution of at least one RF coil (18,18′). A selection unit (32) selects an excitation pattern with a through-plane, one-dimensional excitation k-space trajectory. The through-plane, one-dimensional excitation k-space trajectory is curved into at least a second dimension by an optimization unit (34) according to the generated spatial sensitivity distribution. The optimization unit (34) supplies the curved excitation k-space trajectory to at least one transmitter (24) which causes the at least one RF transmit coil (18,18′) to transmit the selected excitation pattern with the curved excitation k-space trajectory.

Abstract translation: 用于磁共振成像（MRI）系统（10）的射频（RF）匀场装置（50）包括空间灵敏度单元（30），其确定至少一个RF线圈（18）的发射空间灵敏度分布 ，18'）。 选择单元（32）选择具有贯穿平面，一维激励k空间轨迹的激励图案。 根据生成的空间灵敏度分布，通过平面的一维激发k空间轨迹由优化单元（34）弯曲成至少第二维度。 优化单元（34）将弯曲激励k空间轨迹提供给至少一个发射器（24），所述发射器（24）使得至少一个RF发射线圈（18,18'）将所选择的激励模式与弯曲激励k空间 弹道。

公开(公告)号：US08198892B2

公开(公告)日：2012-06-12

申请号：US12386751

申请日：2009-04-22

Applicant: Mark Doyle

Inventor： Mark Doyle

IPC: G01V3/00

CPC classification number: G01R33/5613 ,  G01R33/4833 ,  G01R33/4838 ,  G01R33/5607 ,  G01R33/5611 ,  G01R33/563 ,  G01R33/56325

Abstract: An MRI includes imaging coils. The MRI includes receiving coils. The MRI includes a controller causing the imaging coils to produce RF pulses at every repetition time so different parts of a patient are receiving excitation by RF pulses at different rates and k space data are acquired at each repetition time by the receiving coils to form images of the patient with the k space data. A method for an MRI includes the steps of causing with a controller imaging coils to produce RF pulses at every repetition time so different parts of a patient are receiving excitation by RF pulses at different rates. There is the step of acquiring k space data at each repetition time by receiving coils. There is the step of forming images of the patient with the k space data using approaches such as Fourier transformation or filtered back projection.

Abstract translation: MRI包括成像线圈。 MRI包括接收线圈。 MRI包括控制器，其使成像线圈在每个重复时间产生RF脉冲，使得患者的不同部分通过不同速率的RF脉冲接收激励，并且通过接收线圈在每个重复时间获取k空间数据，以形成图像 患者与k空间数据。 用于MRI的方法包括以下步骤：使控制器成像线圈在每个重复时间产生RF脉冲，使得患者的不同部分通过不同速率的RF脉冲接收激励。 存在通过接收线圈在每个重复时间获取k空间数据的步骤。 使用诸如傅里叶变换或滤波反投影的方法，使用k空间数据形成患者的图像的步骤。