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    • 1. 发明申请
    • CORRECTING THE STATIC MAGNETIC FIELD OF AN MRI RADIOTHERAPY APPARATUS
    • 矫正MRI放射治疗装置的静态磁场
    • WO2012164527A1
    • 2012-12-06
    • PCT/IB2012/052752
    • 2012-05-31
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBHAMTHOR, Thomas, ErikOVERWEG, Johannes, Adrianus
    • AMTHOR, Thomas, ErikOVERWEG, Johannes, Adrianus
    • G01R33/48A61N5/10
    • G01R33/56A61N5/1049A61N2005/1055G01R33/3873G01R33/3875G01R33/4808
    • A method of correcting a magnetic field of an MRI radiotherapy apparatus (300) comprising a magnetic resonance imaging system (302) and a radiation therapy system (304). The MRI system includes a magnet (306) for generating the magnetic field within an imaging zone 318. The magnet generates a magnetic field with a zero crossing (346, 404) outside of the imaging zone. The medical apparatus further comprises a gantry (332) configured for rotating a ferromagnetic component (336, 510) about a rotational axis (333). The method comprises the step of installing (100, 200) a magnetic correcting element (348, 900, 1000) located on a radial path (344, 504) perpendicular to the rotational axis. The magnetic correcting element is positioned on the radial path such that change in the magnetic field within the imaging zone due to the ferromagnetic component is reduced. The method further comprises repeatedly: measuring (102, 202, 1204) the magnetic field within the imaging zone; determining (104, 204, 1206) the change in the magnetic field in the imaging zone; and adjusting (106, 206, 1208) the position of the magnetic correcting element along the radial path if the change in the magnetic field is above a predetermined threshold.
    • 一种校正包括磁共振成像系统(302)和放射治疗系统(304)的MRI放射治疗装置(300)的磁场的方法。 MRI系统包括用于在成像区域318内产生磁场的磁体(306)。磁体在成像区域外部产生具有零交叉(346,404)的磁场。 医疗设备还包括构造成围绕旋转轴线(333)旋转铁磁部件(336,510)的台架(332)。 该方法包括安装(100,200)位于垂直于旋转轴线的径向路径(344,504)上的磁性校正元件(348,900,1000)的步骤。 磁性校正元件位于径向路径上,使得由于铁磁性部件而导致的成像区域内的磁场的变化减小。 该方法还包括:重复地:测量(102,202,1204)成像区域内的磁场; 确定(104,204,1206)所述成像区域中的磁场的变化; 以及如果所述磁场的变化高于预定阈值,则调整所述磁修正元件沿所述径向路径的位置(106,206,1208)。
    • 2. 发明申请
    • MAGNETIC RESONANCE IMAGING GRADIENT COIL, MAGNET ASSEMBLY, AND SYSTEM
    • 磁共振成像梯度线圈,磁铁组件和系统
    • WO2011145029A1
    • 2011-11-24
    • PCT/IB2011/052102
    • 2011-05-13
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBHOVERWEG, Johannes, Adrianus
    • OVERWEG, Johannes, Adrianus
    • G01R33/385
    • G01R33/385G01R33/3854G01R33/4215
    • A magnetic resonance imaging magnet assembly (100) comprising: -a magnet (102) adapted for generating a main magnetic field for aligning the magnetic spins of nuclei of a subject (502) located within an imaging volume (504); and -a gradient coil (103) for generating a gradient magnetic field for spatial encoding of the magnetic resonance signal of spins of nuclei within the imaging volume, wherein the gradient coil is adapted to be mounted into the magnet, wherein the gradient coil comprises: - a first gradient coil section (112), wherein the first gradient coil section comprises a first rigid element (113), - a second gradient coil section (114), wherein the second gradient coil section also comprises a second rigid element (115), - a connecting element (116, 300, 302, 304, 400) for joining the two half gradient coils, wherein the connecting element comprises an elastic material (116), wherein the elastic material is in contact with the first rigid element and the second rigid element.
    • 一种磁共振成像磁体组件(100),包括: - 磁体(102),适于产生主磁场,用于对准位于成像体积(504)内的对象(502)的核的磁旋转; 和梯度线圈(103),用于产生用于空间编码成像体积内的核心的磁共振信号的梯度磁场,其中所述梯度线圈适于安装到所述磁体中,其中所述梯度线圈包括: - 第一梯度线圈段(112),其中所述第一梯度线圈段包括第一刚性元件(113), - 第二梯形线圈段(114),其中所述第二梯形线圈段还包括第二刚性元件(115) , - 用于连接所述两个半梯度线圈的连接元件(116,300,302,304,400),其中所述连接元件包括弹性材料(116),其中所述弹性材料与所述第一刚性元件接触,并且 第二刚性元件。