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1.发明授权Magnetic resonance imaging apparatus with means for correcting magnetic field homogeneity 有权具有用于校正磁场均匀性的装置的磁共振成像装置公开(公告)号：US09188652B2
公开(公告)日：2015-11-17
申请号：US13519864
申请日：2011-01-18
申请人： Stefano Besio , Felice Badino , Davide Carlini , Stefano Pittaluga , Vincenzo Punzo , Alessandro Trequattrini
发明人： Stefano Besio , Felice Badino , Davide Carlini , Stefano Pittaluga , Vincenzo Punzo , Alessandro Trequattrini
IPC分类号： G01V3/00 , G01R33/38 , G01R33/3873 , G01R33/381 , G01R33/383 , G01R33/3875
CPC分类号： G01R33/3806 , G01R33/381 , G01R33/383 , G01R33/3873 , G01R33/3875
摘要： A Magnetic Resonance apparatus includes a 3D structure having a cavity for receiving a body under examination, a mechanism for generating a static magnetic field in the patient receiving cavity, a mechanism for generating variable magnetic fields in the cavity, an antenna for transmitting electromagnetic nuclear spin excitation pulses, an antenna for receiving the electromagnetic signals generated by nuclear spin relaxation, a plate for locating and fixing magnetic dipoles for fine correction of magnetic field homogeneity, and a compartment for the magnetic correction dipole locating and fixing plate, the compartment being adapted to be opened for direct access to the magnetic correction dipole locating and fixing plate from the outside. The compartment may be opened either by removal of an end plate of the magnetic field generating mechanism, or via a lateral slot for insertion and removal of the magnetic correction dipole locating and fixing plate.
摘要翻译： 磁共振装置包括具有用于接收检查体的空腔的3D结构，用于在患者容纳腔中产生静磁场的机构，用于在空腔中产生可变磁场的机构，用于传输电磁核旋转的天线 激励脉冲，用于接收由核自旋弛豫产生的电磁信号的天线，用于定位和固定用于磁场均匀性的精细校正的偶极子的板，以及用于磁校正偶极定位和固定板的隔间， 打开以从外部直接进入磁性校正偶极定位和固定板。 可以通过移除磁场产生机构的端板，或者通过用于插入和移除磁性校正偶极定位和固定板的侧向槽来打开隔间。
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公开(公告)号：US20110025332A1
公开(公告)日：2011-02-03
申请号：US12844227
申请日：2010-07-27
IPC分类号： G01R33/38 , G01R33/3815 , G01R33/381
CPC分类号： G01R33/3806 , G01R33/3804 , G01R33/381 , G01R33/3815 , G01R33/383 , G01R33/3873 , G01R33/3875
摘要： An MRI apparatus comprising a magnet structure which delimits a cavity for receiving a body under examination or a part thereof, and which includes means for generating a magnetic field in said cavity, as well as means for causing the body under examination or the part thereof to emit nuclear magnetic resonance signals, a region being defined in the cavity, known as imaging volume, and means for receiving the nuclear magnetic resonance signals. The MRI apparatus also comprises an electronic processing unit with which the means for receiving the nuclear magnetic resonance signals are electrically connected; the cavity has an access opening for receiving a body under examination or part thereof.The geometric center of the geometric shape of the cavity delimited by the magnet structure is in offset relation to the geometric center of the imaging volume.
摘要翻译： 一种MRI装置，包括限定用于接收检查体或其一部分的空腔的磁体结构，并且包括用于在所述空腔中产生磁场的装置，以及用于使被检体或其部分的装置 发射核磁共振信号，在空腔中限定的区域，称为成像体积，以及用于接收核磁共振信号的装置。 MRI装置还包括电子处理单元，用于接收核磁共振信号的装置通过该电子处理单元电连接; 空腔具有用于接收正在检查的身体或其一部分的进入开口。 由磁体结构限定的空腔的几何形状的几何中心与成像体积的几何中心偏移。
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公开(公告)号：US20100301861A1
公开(公告)日：2010-12-02
申请号：US12784623
申请日：2010-05-21
CPC分类号： G01R33/383 , G01R33/3873
摘要： An MRI apparatus including a magnetic structure defining a cavity for receiving a body under examination or a part thereof, a mechanism for generating a magnetic field inside the cavity, a mechanism for causing the body under examination or a part thereof to emit nuclear magnetic resonance signals, and a mechanism for receiving the nuclear magnetic resonance signals. The mechanism for generating the magnetic field includes one or more elements made of permanently magnetized material of the so-called superconducting bulk material type and, in combination therewith, a mechanism for keeping the magnetization condition of the superconducting bulk material which includes mechanisms for maintaining the temperature of the permanently magnetized material below the critical temperature thereof and for restoring the magnetization of the superconducting bulk material upon a complete or partial demagnetization.
摘要翻译： 一种MRI装置，包括限定用于接收检查体的空腔的磁性结构或其一部分，用于在腔内产生磁场的机构，用于使被检体或其一部分发射核磁共振信号的机构 以及用于接收核磁共振信号的机构。 用于产生磁场的机构包括由所谓的超导散装材料类型的永久磁化材料制成的一个或多个元件，并且与其结合，用于保持超导散装材料的磁化条件的机构包括用于保持 永久磁化材料的温度低于其临界温度，并且用于在完全或部分退磁时恢复超导体材料的磁化。
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4.发明授权Method for determining construction parameters of magnet structures designed to generate magnetic fields in predetermined volumes of space and method for correcting magnetic fields in predetermined volumes of space, particularly in MRI apparatus 有权用于确定设计成在预定体积的空间中产生磁场的磁体结构的构造参数的确定方法，以及用于校正预定体积的空间中的磁场的方法，特别是在MRI装置中公开(公告)号：US07492158B2
公开(公告)日：2009-02-17
申请号：US11515760
申请日：2006-09-06
IPC分类号： G01V3/00
CPC分类号： G01R33/3802 , G01R33/3875
摘要： A method for determining construction parameters of magnet structures designed to generate magnetic fields in predetermined volumes of space, comprising the steps of: a) defining a predetermined volume of space in which a static magnetic field is to be generated; b) defining the nominal strength and profile of the magnetic field in said predetermined volume of space; c) mathematically describing the nominal magnetic field on the surface of and/or in said predetermined volume of space by using a polynomial expansion of the magnetic field-describing function, which provides a series of coefficients; d) determining the size, geometry and relative position in space of the means for generating said nominal magnetic field, with respect to the volume of space in and on which the desired, i.e. nominal magnetic field, is defined. According to the invention, the predetermined volume of space is delimited by an ideal ellipsoidal closed surface and the magnetic field is expressed by coefficients of a polynomial ellipsoidal harmonic expansion. The method may be also used as a shimming method in volumes of space ideally delimited by ellipsoidal closed surfaces, to be implemented whether or not the predetermined volume of space defined by the magnet structure is also delimited by an ideal closed surface, with an ellipsoidal or other shape.
摘要翻译： 一种用于确定设计成在预定体积的空间中产生磁场的磁体结构的构造参数的方法，包括以下步骤：a）限定要在其中产生静磁场的预定体积的空间; b）限定所述预定体积的空间中的磁场的标称强度和轮廓; c）通过使用提供一系列系数的磁场描述函数的多项式展开来数学地描述和/或在所述预定体积的空间中的标称磁场; d）确定用于产生所述标称磁场的装置的空间中的尺寸，几何形状和相对位置，相对于限定期望的即标称磁场的空间体积。 根据本发明，预定体积的空间由理想的椭圆形封闭表面限定，并且磁场由多项式椭球谐波膨胀系数表示。 该方法还可以用作理想地由椭圆形封闭表面限定的空间体积中的匀场方法，以实现由磁体结构限定的预定体积的空间是否也被理想的封闭表面限定，具有椭圆形或 其他形状。
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公开(公告)号：US10024944B2
公开(公告)日：2018-07-17
申请号：US14669066
申请日：2015-03-26
申请人： Vincenzo Punzo
发明人： Vincenzo Punzo
IPC分类号： G01R33/565 , G01R33/383 , G01R33/3873 , G01R33/48
摘要： A shimming method for correcting inhomogeneity of a static magnetic field generated by a magnet of a nuclear magnetic resonance imaging machine includes: measuring the magnetic field at a plurality of points over a reference surface; generating a polynomial that solves Laplace's equation with boundary conditions given on the reference surface, the polynomial representing the magnetic field on the reference surface and having a plurality of harmonic terms, each associated with a coefficient; determining the coefficients from the field sampling values; defining a grid for positioning a plurality of correction elements and relating it to the field structure; and calculating the position and magnitude parameters of the correction elements, such that the correction elements affect the coefficients of the magnetic field to obtain the desired field characteristics, wherein the reference surface is a superquadric surface, such that the magnetic field is corrected in a volume delimited by the superquadric surface.
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公开(公告)号：US08598875B2
公开(公告)日：2013-12-03
申请号：US12844227
申请日：2010-07-27
IPC分类号： G01V3/00
CPC分类号： G01R33/3806 , G01R33/3804 , G01R33/381 , G01R33/3815 , G01R33/383 , G01R33/3873 , G01R33/3875
摘要： An MRI apparatus having a magnet structure which delimits a cavity for receiving a body under examination or a part thereof, which includes a mechanism for generating a magnetic field in the cavity, as well as a mechanism for causing the body under examination or the part thereof to emit nuclear magnetic resonance signals, a region defined in the cavity, known as an imaging volume, and a mechanism for receiving the nuclear magnetic resonance signals. The geometric center of the geometric shape of the cavity delimited by the magnet structure is offset in relation to the geometric center of the imaging volume.
摘要翻译： 一种具有磁体结构的磁共振成像装置，该磁体结构界定用于接收检查体的空腔或其一部分，该磁体结构包括用于在空腔中产生磁场的机构，以及用于使被检体或其部分的机构 发射核磁共振信号，在空腔中限定的区域，称为成像体积，以及用于接收核磁共振信号的机构。 由磁体结构限定的空腔的几何形状的几何中心相对于成像体积的几何中心偏移。
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公开(公告)号：US08593143B2
公开(公告)日：2013-11-26
申请号：US12784623
申请日：2010-05-21
IPC分类号： G01V3/00
CPC分类号： G01R33/383 , G01R33/3873
摘要： An MRI apparatus including a magnetic structure defining a cavity for receiving a body under examination or a part thereof, a mechanism for generating a magnetic field inside the cavity, a mechanism for causing the body under examination or a part thereof to emit nuclear magnetic resonance signals, and a mechanism for receiving the nuclear magnetic resonance signals. The mechanism for generating the magnetic field includes one or more elements made of permanently magnetized material of the so-called superconducting bulk material type and, in combination therewith, a mechanism for keeping the magnetization condition of the superconducting bulk material which includes mechanisms for maintaining the temperature of the permanently magnetized material below the critical temperature thereof and for restoring the magnetization of the superconducting bulk material upon a complete or partial demagnetization.
摘要翻译： 一种MRI装置，包括限定用于接收检查体的空腔的磁性结构或其一部分，用于在腔内产生磁场的机构，用于使被检体或其一部分发射核磁共振信号的机构 以及用于接收核磁共振信号的机构。 用于产生磁场的机构包括由所谓的超导散装材料类型的永久磁化材料制成的一个或多个元件，并且与其结合，用于保持超导散装材料的磁化条件的机构包括用于保持 永久磁化材料的温度低于其临界温度，并且用于在完全或部分退磁时恢复超导体材料的磁化。
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8.发明申请公开(公告)号：US20150276911A1
公开(公告)日：2015-10-01
申请号：US14669066
申请日：2015-03-26
申请人： Vincenzo Punzo
发明人： Vincenzo Punzo
IPC分类号： G01R33/565 , G01R33/383 , G01R33/3873 , G01R33/48
CPC分类号： G01R33/56572 , G01R33/383 , G01R33/3873 , G01R33/4822
摘要： A shimming method for correcting inhomogeneity of a static magnetic field generated by a magnet of a nuclear magnetic resonance imaging machine includes: measuring the magnetic field at a plurality of points over a reference surface; generating a polynomial that solves Laplace's equation with boundary conditions given on the reference surface, the polynomial representing the magnetic field on the reference surface and having a plurality of harmonic terms, each associated with a coefficient; determining the coefficients from the field sampling values; defining a grid for positioning a plurality of correction elements and relating it to the field structure; and calculating the position and magnitude parameters of the correction elements, such that the correction elements affect the coefficients of the magnetic field to obtain the desired field characteristics, wherein the reference surface is a superquadric surface, such that the magnetic field is corrected in a volume delimited by the superquadric surface.
摘要翻译： 用于校正由核磁共振成像机的磁体产生的静磁场的不均匀性的匀场方法包括：测量参考表面上的多个点处的磁场; 生成一个多项式，其解决了在参考表面上给出的边界条件的拉普拉斯方程，多项式表示参考表面上的磁场并具有多个谐波项，每个与系数相关联; 根据场采样值确定系数; 定义用于定位多个校正元件并将其与场结构相关联的网格; 以及计算所述校正元件的位置和幅度参数，使得所述校正元件影响所述磁场的系数以获得期望的场特性，其中所述参考表面是超四次表面，使得所述磁场被校正为体积 由超级表面划分。
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9.发明授权Method for making a permanent magnet particularly for MRI scanners and a permanent magnet, particularly for MRI scanners made by said method 有权特别是用于MRI扫描仪和永磁体的永磁体的制造方法，特别是用于通过所述方法制造的MRI扫描仪公开(公告)号：US08610436B2
公开(公告)日：2013-12-17
申请号：US12899176
申请日：2010-10-06
IPC分类号： G01V3/00
CPC分类号： G01R33/383 , Y10T29/49764
摘要： Method for making magnets particularly for the use in MRI scanners, which magnets are three-dimensional and have a tubular wall made of magnetized material, with a closed or open annular shaped cross-section, the tubular wall being composed of individual elements made of magnetized material, the magnetization of each element made of magnetized material having a predetermined direction in the transverse section plane and said directions being determined such to generate a uniform static magnetic field in the cavity of the tubular wall. The invention provides the following steps: determining the modulus and direction of the magnetization of elements necessary for generating a predetermined magnetic field in said cavity in a theoretical two-dimensional magnet model, extruding the two-dimensional model to a three-dimensional model and at least partially compensating aberrations, distortions or inhomogeneites of the magnetic field generated in the three-dimensional model by modifying the magnetization orientation in the individual elements and in the plane of the two-dimensional model such to minimize differences between the magnetic field in the two-dimensional model and the magnetic field in the three-dimensional model above all as regards its homogeneity level. The invention relates also to a magnet made by said method and particularly a small magnet.
摘要翻译： 用于制造磁铁的方法，特别是用于MRI扫描仪，其磁体是三维的并且具有由磁化材料制成的管状壁，具有闭合或开放的环形横截面，所述管状壁由被磁化的单个元件组成 材料，在横截面中具有预定方向的磁化材料制成的每个元件的磁化和所述方向被确定为在管状壁的空腔中产生均匀的静磁场。 本发明提供以下步骤：确定在理论二维磁体模型中在所述腔中产生预定磁场所必需的元件的磁化强度的模量和方向，将二维模型挤压成三维模型， 通过修改各个元件中的磁化取向和二维模型的平面中的最小化在三维模型中产生的磁场的像差，失真或不均匀性来最小化部分补偿，以最小化二维模型中的磁场之间的差异， 三维模型和三维模型中的磁场首先是其均匀性水平。 本发明还涉及由所述方法制成的磁体，特别是小磁体。
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10.发明申请公开(公告)号：US20120286785A1
公开(公告)日：2012-11-15
申请号：US13519864
申请日：2011-01-18
申请人： Stefano Besio , Felice Badino , Davide Carlini , Stefano Pittaluga , Vincenzo Punzo , Alessandro Trequattrini
发明人： Stefano Besio , Felice Badino , Davide Carlini , Stefano Pittaluga , Vincenzo Punzo , Alessandro Trequattrini
IPC分类号： G01R33/34
CPC分类号： G01R33/3806 , G01R33/381 , G01R33/383 , G01R33/3873 , G01R33/3875
摘要： A Magnetic Resonance apparatus includes a 3D structure having a cavity for receiving a body under examination, a mechanism for generating a static magnetic field in the patient receiving cavity, a mechanism for generating variable magnetic fields in the cavity, an antenna for transmitting electromagnetic nuclear spin excitation pulses, an antenna for receiving the electromagnetic signals generated by nuclear spin relaxation, a plate for locating and fixing magnetic dipoles for fine correction of magnetic field homogeneity, and a compartment for the magnetic correction dipole locating and fixing plate, the compartment being adapted to be opened for direct access to the magnetic correction dipole locating and fixing plate from the outside. The compartment may be opened either by removal of an end plate of the magnetic field generating mechanism, or via a lateral slot for insertion and removal of the magnetic correction dipole locating and fixing plate.
摘要翻译： 磁共振装置包括具有用于接收检查体的空腔的3D结构，用于在患者容纳腔中产生静磁场的机构，用于在空腔中产生可变磁场的机构，用于传输电磁核旋转的天线 激励脉冲，用于接收由核自旋弛豫产生的电磁信号的天线，用于定位和固定用于磁场均匀性的精细校正的偶极子的板，以及用于磁校正偶极定位和固定板的隔间， 打开以从外部直接进入磁性校正偶极定位和固定板。 可以通过移除磁场产生机构的端板，或者通过用于插入和移除磁性校正偶极定位和固定板的侧向槽来打开隔间。
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