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    Magnetic resonance imaging apparatus
    43.
    发明授权
    Magnetic resonance imaging apparatus 有权
    磁共振成像装置

    公开(公告)号：US09310453B2

    公开(公告)日：2016-04-12

    申请号：US13669703

    申请日：2012-11-06

    Applicant: KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA MEDICAL SYSTEMS CORPORATION

    Inventor： Naho Imamura ,  Masao Yui

    IPC: G01V3/00 ,  G01R33/58 ,  G01R33/341 ,  G01R33/54 ,  G01R33/3415 ,  G01R33/563

    CPC classification number: G01R33/58 ,  G01R33/341 ,  G01R33/3415 ,  G01R33/543 ,  G01R33/56383

    Abstract: An MRI (magnetic resonance imaging) apparatus includes a main scan executing unit for executing a main scan, an image reconstruction unit for reconstructing image data based on MR signals acquired in the main scan, a calibration scan setting unit, a calibration scan executing unit, and a condition determining unit. The calibration scan setting unit calculates a condition of a calibration scan for determining an imaging condition of the main scan or a condition of correction processing of the image data, based on a type of an RF coil device and an imaging part. The calibration scan executing unit executes the calibration scan based on the condition of the calibration scan. The condition determining unit determines the imaging condition of the main scan or the condition of the correction processing, based on an execution result of the calibration scan.

    Abstract translation: MRI（磁共振成像）装置包括用于执行主扫描的主扫描执行单元，用于基于在主扫描中获取的MR信号重建图像数据的图像重建单元，校准扫描设置单元，校准扫描执行单元， 和条件确定单元。 校准扫描设置单元基于RF线圈装置和成像部件的类型来计算用于确定主扫描的成像条件的校准扫描的条件或图像数据的校正处理的条件。 校准扫描执行单元根据校准扫描的条件执行校准扫描。 条件确定单元基于校准扫描的执行结果来确定主扫描的成像条件或校正处理的条件。

    AUTOMATED OPTIMIZATION OF MRI IMAGE ACQUISITION PARAMETERS
    46.
    发明申请
    AUTOMATED OPTIMIZATION OF MRI IMAGE ACQUISITION PARAMETERS 审中-公开
    MRI图像获取参数的自动优化

    公开(公告)号：US20160061925A1

    公开(公告)日：2016-03-03

    申请号：US14840003

    申请日：2015-08-30

    Applicant: ASPECT IMAGING LTD.

    Inventor： Uri RAPOPORT

    IPC: G01R33/58 ,  G01R33/48 ,  G01R33/50

    CPC classification number: G01R33/58 ,  G01R33/50

    Abstract: A method for automatic determination of optimal Magnetic Resonance Imaging (MRI) acquisition parameters for imaging in an MRI instrument a sample containing two types of tissue, tissue A and tissue B, wherein said method comprises: determining T1A, T2A, T1B, T2B, ρA, and ρB, where ρ represents the density of NMR-active nuclei being probed; setting initial values of TR and TE; determining the signal intensities SA and SB from the equation S=ρE1E2, where E1=1−e−TR/T1 and E2=e−TE/T2; calculating the contrast-to-noise ratio for tissue A in the presence of tissue B (CNRAB) from the equation CNR AB = P  ( S A - S B ) T R , where P is a proportionality constant; and, determining optimal values of TR and TE that yield a maximum value of CNRAB(TR,TE). In other embodiments of the invention, the method includes optimization of additional acquisition parameters. An MRI system in which the method is implemented so that acquisition parameters can be optimized without any intervention by the system operator is also disclosed.

    Abstract translation: 一种用于自动确定最佳磁共振成像（MRI）获取参数的方法，用于在MRI仪器中成像含有两种类型的组织，组织A和组织B的样品，其中所述方法包括：确定T1A，T2A，T1B，T2B，＆rgr ; A和＆rgr; B，其中＆rgr; 表示被探测的核磁共振活性核的密度; 设定TR和TE的初始值; 从等式S =＆rgr; E1E2确定信号强度SA和SB，其中E1 = 1-e-TR / T1和E2 = e-TE / T2; 在组织B（CNRAB）的存在下，从方程式CNR AB = P（S A-S B）T R计算组织A的对比度信噪比，其中P是比例常数; 并且确定产生CNRAB（TR，TE）的最大值的TR和TE的最佳值。 在本发明的其它实施例中，该方法包括优化额外的采集参数。 还公开了一种MRI系统，其中实施该方法使得获取参数可以在没有系统操作者的任何干预的情况下被优化。

    MAGNETIC RESONANCE IMAGING DEVICE AND TIMING MISALIGNMENT DETECTION METHOD THEREOF
    47.
    发明申请
    MAGNETIC RESONANCE IMAGING DEVICE AND TIMING MISALIGNMENT DETECTION METHOD THEREOF 审中-公开
    磁共振成像装置及时序误差检测方法

    公开(公告)号：US20160025824A1

    公开(公告)日：2016-01-28

    申请号：US14760846

    申请日：2013-12-04

    Applicant: HITACHI, LTD. ,  HITACHI MEDICAL CORPORATION

    Inventor： Yo TANIGUCHI ,  Masahiro TAKIZAWA ,  Takeshi YATSUO ,  Atsushi KURATANI

    IPC: G01R33/385 ,  G01R33/565 ,  G01R33/58

    CPC classification number: G01R33/3852 ,  G01R33/546 ,  G01R33/56572 ,  G01R33/58

    Abstract: A magnetic resonance imaging device produces a magnetic field gradient with parallel driving of positive-side subcoils and negative-side subcoils with different power sources in the magnetic field gradient direction, to detect a misalignment in drive timing of the positive side and the negative side. Pulse sequences for timing misalignment detection having a slice magnetic field gradient pulse and a read-out magnetic field gradient pulse in the same direction as a magnetic field gradient of interest are executed. A positive-side slice echo and a negative-side slice echo of the magnetic field gradient are acquired. A phase difference between a positive-side projection image and a negative-side projection image is derived by computation with phase error from other factors being removed. From the slope of the phase difference with respect to a location, the drive timing misalignment between the positive-side subcoil and the negative-side subcoil of the magnetic field gradient production is detected.

    Abstract translation: 磁共振成像装置在磁场梯度方向上产生具有不同电源的正侧子线圈和负侧子线圈的平行驱动的磁场梯度，以检测正侧和负侧的驱动定时中的未对准。 执行具有与感兴趣的磁场梯度相同方向的切片磁场梯度脉冲和读出磁场梯度脉冲的定时未对准检测的脉冲序列。 获取磁场梯度的正侧切片回波和负侧切片回波。 正面投影图像和负侧投影图像之间的相位差通过计算得出，相位误差从其他因素被去除。 从相位差相对于位置的斜率检测出磁场梯度产生的正侧次线圈与负侧次线圈之间的驱动定时偏移。

    PHANTOM BASED MR FIELD MAPPING OF THE POLARIZING MAGNETIC FIELD
    48.
    发明申请
    PHANTOM BASED MR FIELD MAPPING OF THE POLARIZING MAGNETIC FIELD 有权
    偏振磁场的基于PHANTOM的MR场映射

    公开(公告)号：US20150338475A1

    公开(公告)日：2015-11-26

    申请号：US14652836

    申请日：2013-12-11

    Applicant: KONINKLIJKE PHILIPS N.V. ,  PHILIPS GMBH

    Inventor： JOHANNES ADRIANUS OVERWEG ,  KAY NEHRKE

    IPC: G01R33/24 ,  G01R33/34 ,  G01R33/58 ,  G01R33/385

    CPC classification number: G01R33/243 ,  G01R33/34 ,  G01R33/385 ,  G01R33/58

    Abstract: The present invention provides a phantom (200) for use in a magnetic resonance (MR) imaging system (110) with a set of resonating volumes (206) positioned in a base body (202), whereby the base body (202) has a spherical or ellipsoid shape in accordance with a volume of interest (203) of the MR imaging system (110), and the resonating volumes (206) are located at a circumference of the base body (202). The phantom is used in a method for evaluating the magnetic field of a main magnet (114) of a magnetic resonance (MR) imaging system (110), comprising the steps of positioning the phantom (200) within the main magnet (114), performing a 3D spectroscopic MR measurement of the phantom (200) using the MR imaging system (110), thereby measuring resonances of the resonating volumes (206), assigning the measured resonances to the resonating volumes (206), and evaluating the magnetic field of the main magnet (114) from the MR measurement of the phantom (200) based on the measured resonances of the resonating volumes (206). Accordingly, the MR imaging system itself is directly used for determining the magnetic field of its main magnet. Accordingly, the MR imaging system itself can be used as measurement equipment, instead of a separate NMR magnetometer, which is required for conventional determination of the magnetic field.

    Abstract translation: 本发明提供了一种用于磁共振（MR）成像系统（110）的体模（200），其具有定位在基体（202）中的一组谐振体积（206），由此基体（202）具有 根据MR成像系统（110）的感兴趣体积（203）和谐振体积（206）位于基体（202）的圆周处的球形或椭圆体形状。 该幻影用于评估磁共振（MR）成像系统（110）的主磁体（114）的磁场的方法，包括以下步骤：将体模（200）定位在主磁体（114）内， 使用MR成像系统（110）执行体模（200）的3D分光MR测量，从而测量谐振体积（206）的共振，将测量的共振分配给谐振体积（206），并且评估磁场 基于所测量的共振体积（206）的共振，来自所述体模（200）的MR测量的所述主磁体（114）。 因此，MR成像系统本身直接用于确定其主磁体的磁场。 因此，MR成像系统本身可以用作测量设备，而不是单独的NMR磁强计，这是常规确定磁场所需要的。

    Systems and methods for characterizing spatial distortion in 3D imaging systems
    49.
    发明授权
    Systems and methods for characterizing spatial distortion in 3D imaging systems 有权
    表征3D成像系统空间失真的系统和方法

    公开(公告)号：US09196082B2

    公开(公告)日：2015-11-24

    申请号：US14267660

    申请日：2014-05-01

    Applicant: Loma Linda University Medical Center

    Inventor： Robert D. Pearlstein ,  David Scott Kittle ,  Barbara Ann Holshouser

    IPC: G06K9/00 ,  G06T15/08 ,  A61B6/03 ,  A61B6/00 ,  A61B19/00 ,  G06T7/00 ,  A61N5/10 ,  G01R33/58 ,  A61B5/055 ,  A61B17/00

    CPC classification number: G06T11/003 ,  A61B5/055 ,  A61B6/037 ,  A61B6/583 ,  A61B90/36 ,  A61B2017/00716 ,  A61B2017/00725 ,  A61N5/1049 ,  A61N2005/1052 ,  A61N2005/1055 ,  A61N2005/1061 ,  A61N2005/1076 ,  B33Y50/00 ,  B33Y80/00 ,  G01R33/58 ,  G06T5/20 ,  G06T7/0016 ,  G06T15/08 ,  G06T2200/04 ,  G06T2207/10012 ,  G06T2207/10072

    Abstract: Systems and methods for characterizing spatial distortions in location data determined by an imaging system, for example as employed in imaged guided therapy. A three dimensional phantom is custom formed for a desired imaging space of a given imaging system. The phantom includes a large plurality of control points fixed rigidly in space to a high degree of known accuracy. The phantom is fixed to a stereotactic frame defining a known calibrated reference or zero and imaged. An algorithm customized for the phantom determines the spatial locations of the control points. A comparison is made between the known and the determined spatial locations for at least a subset of the control points. The comparison results in indicia for any determined spatial distortions observed. The raw image data can be manipulated to compensate for any spatial distortion. The control points can have fixed locations known to an accuracy of 100 μm or better. The algorithm can determine an initial estimate for the detected location of a control point accurate to .+−.0.5 pixel or better.

    Abstract translation: 用于表征由成像系统确定的位置数据中的空间失真的系统和方法，例如在成像引导治疗中使用。 为给定成像系统的期望的成像空间定制三维体模。 幻影包括大量已知精度的大量固定在空间中的控制点。 该体模固定在立体定向框架上，定义已知的校准基准或零点并成像。 为幻影定制的算法决定了控制点的空间位置。 对于控制点的至少一个子集的已知和确定的空间位置之间进行比较。 比较结果显示任何确定的空间失真的标记。 原始图像数据可以被操纵以补偿任何空间失真。 控制点可以具有已知的精确度为100μm或更好的固定位置。 该算法可以确定精确到±0.5像素或更好的控制点的检测位置的初始估计。

    MRI PHANTOM, METHOD FOR MAKING SAME AND ACQUIRING AN MRI IMAGE
    50.
    发明申请
    MRI PHANTOM, METHOD FOR MAKING SAME AND ACQUIRING AN MRI IMAGE 审中-公开
    MRI PHANTOM，其制作方法和获取MRI图像

    公开(公告)号：US20150323639A1

    公开(公告)日：2015-11-12

    申请号：US14802419

    申请日：2015-07-17

    Applicant: NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY

    Inventor： MICHAEL A. BOSS

    IPC: G01R33/58

    CPC classification number: G01R33/58 ,  G01R33/50 ,  Y10T29/49828

    Abstract: A magnetic resonance imaging (MRI) phantom includes an outer container that includes a first portion comprising a first wall; a second portion opposingly disposed to the first portion and sealingly engaged to the first portion, the second portion including a second wall; and an internal volume bounded by the first wall and the second wall, the internal volume being hollow and configured to receive a fluid; and a sample holder disposed in the internal volume of the outer container, wherein the MRI phantom is configured to maintain a constant temperature of the internal volume. A process for acquiring an MRI image includes providing an MRI; disposing a sample member in the sample holder; disposing a fluid in the MRI phantom; disposing the MRI phantom in an MRI device; achieving thermal equilibrium in the MRI phantom at a selected temperature; and subjecting the MRI phantom to MRI imaging at the selected temperature to acquire the MRI image of the sample.

    Abstract translation: 磁共振成像（MRI）体模包括外容器，其包括包含第一壁的第一部分; 第二部分，相对地设置在第一部分上并与第一部分密封接合，第二部分包括第二壁; 以及由所述第一壁和所述第二壁限定的内部容积，所述内部容积是中空的并且构造成容纳流体; 以及设置在所述外部容器的内部体积中的样本保持架，其中所述MRI体模被配置为保持所述内部体积的恒定温度。 用于获取MRI图像的过程包括提供MRI; 将样品置于样品架中; 在MRI模型中处理流体; 将MRI体模放置在MRI装置中; 在选定的温度下实现MRI体模的热平衡; 并在所选择的温度下对MRI体模进行MRI成像，以获取样本的MRI图像。

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