利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

202 条记录 (耗时 0.032 秒)

    Low-field magnetic resonance imaging methods and apparatus
    1.
    发明授权
    Low-field magnetic resonance imaging methods and apparatus 有权

    公开(公告)号：US11105873B2

    公开(公告)日：2021-08-31

    申请号：US16742311

    申请日：2020-01-14

    申请人： Hyperfine, Inc.

    发明人： Michael Stephen Poole ,  Cedric Hugon

    IPC分类号： G01R33/38 ,  G01R33/385 ,  G01R33/383 ,  G01R33/44 ,  A61B50/13 ,  G01R33/389 ,  G01R33/421 ,  G01R33/56 ,  A61B6/00 ,  A61G13/10 ,  G01R33/34 ,  A61B5/055 ,  G01R33/48 ,  A61B90/00 ,  G01R33/3873 ,  G01R33/36 ,  G01R33/422

    摘要： According to some aspects, a low-field magnetic resonance imaging system is provided. The low-field magnetic resonance imaging system comprises a magnetics system having a plurality of magnetics components configured to produce magnetic fields for performing magnetic resonance imaging, the magnetics system comprising, a B0 magnet configured to produce a B0 field for the magnetic resonance imaging system at a low-field strength of less than 0.2 Tesla (T), a plurality of gradient coils configured to, when operated, generate magnetic fields to provide spatial encoding of magnetic resonance signals, and at least one radio frequency coil configured to, when operated, transmit radio frequency signals to a field of view of the magnetic resonance imaging system and to respond to magnetic resonance signals emitted from the field of view, a power system comprising one or more power components configured to provide power to the magnetics system to operate the magnetic resonance imaging system to perform image acquisition, and a power connection configured to connect to a single-phase outlet to receive mains electricity and deliver the mains electricity to the power system to provide power needed to operate the magnetic resonance imaging system. According to some aspects, the power system operates the low-field magnetic resonance imaging system using an average of less than 1.6 kilowatts during image acquisition.

    CRYOGENIC FIELD SENSING FOR COMPENSATING MAGNETIC FIELD VARIATIONS IN MAGNETIC RESONANCE IMAGING MAGNETS
    7.
    发明申请
    CRYOGENIC FIELD SENSING FOR COMPENSATING MAGNETIC FIELD VARIATIONS IN MAGNETIC RESONANCE IMAGING MAGNETS 审中-公开

    公开(公告)号：US20190154777A1

    公开(公告)日：2019-05-23

    申请号：US16305946

    申请日：2017-06-05

    申请人： KONINKLIJKE PHILIPS N.V.

    发明人： GERARDUS BERNARDUS JOZEF MULDER ,  CORNELIS LEONARDUS GERARDUS HAM

    IPC分类号： G01R33/389 ,  H01F6/00 ,  G01R33/3815 ,  G01R33/421

    摘要： A superconducting magnet includes superconducting magnet coils (C1, C2, C3, C4, C5, C6, S1, S2) disposed inside a magnet cryostat (12). The superconducting magnet coils generate a static (B0) magnetic field when an electric current flows in the superconducting magnet coils. A superconducting B0 compensation circuit (30, 60, 70) is also disposed inside the magnet cryostat, and is coupled with the superconducting magnet coils to passively reduce temporal variations in the B0 magnetic field generated by the superconducting magnet coils. An electric current sensor (40) is also disposed inside the magnet cryostat and is connected to measure electric current flowing in the superconducting B0 compensation circuit. An active B0 compensation component (50) is operatively connected with the electric current sensor to receive the measurement of electric current flowing in the superconducting B0 compensation circuit and to provide active B0 magnetic field compensation based on the measured electric current.

    Method and apparatus for magnetic resonance imaging
    8.
    发明授权
    Method and apparatus for magnetic resonance imaging 有权

    公开(公告)号：US10267885B2

    公开(公告)日：2019-04-23

    申请号：US14882793

    申请日：2015-10-14

    申请人： Siemens Aktiengesellschaft

    发明人： David Grodzki

    IPC分类号： G01R33/565 ,  G01R33/00 ,  G01R33/025 ,  G01R33/387 ,  G01R33/389

    摘要： To enable improved magnetic resonance imaging in the vicinity of an interference object that produces a magnetic interference field in an examination region, in a method and apparatus for magnetic resonance imaging of the examination region magnetic resonance raw data are acquired from the examination region by execution of a magnetic resonance sequence having multiple repetition intervals and refocusing of spins in the examination region at the end of each repetition interval repetition intervals. During at least part of the duration of the acquisition of the magnetic resonance raw data, a magnetic compensation gradient is activated that is opposed to the magnetic interference field.

    A METHOD OF DETERMINING A GRADIENT IMPULSE RESPONSE FUNCTION DURING EXECUTION OF A MAGNETIC RESONANCE IMAGING OR SPECTROSCOPY SEQUENCE
    10.
    发明申请
    A METHOD OF DETERMINING A GRADIENT IMPULSE RESPONSE FUNCTION DURING EXECUTION OF A MAGNETIC RESONANCE IMAGING OR SPECTROSCOPY SEQUENCE 审中-公开

    公开(公告)号：US20180136298A1

    公开(公告)日：2018-05-17

    申请号：US15573284

    申请日：2016-05-12

    申请人： EIDGENOSSISCHE TECHNISCHE HOCHSCHULE ,  UNIVERSITAT ZURICH

    发明人： Bertram Wilm ,  Christoph Barmet ,  Klaas P. Prussmann

    IPC分类号： G01R33/565 ,  G01R33/389 ,  G01R33/58 ,  G01R33/46

    CPC分类号： G01R33/56518 ,  G01R33/389 ,  G01R33/4625 ,  G01R33/58

    摘要： A method of determining an actual gradient impulse response function during execution of a magnetic resonance (MR) imaging or spectroscopy sequence, wherein a main magnetic field is generated in a sample region of an MR apparatus by means of a main magnet and wherein superimposed time dependent gradient fields and radiofrequency fields in a first RF band are generated in the sample region according to a first MR sequence for forming images or spectra, the gradient fields being generated by gradient forming means of the MR apparatus operated according to a gradient forming sequence part of said first MR sequence, the MR apparatus further comprising at least one magnetic field probe. The method comprises the steps of: —operating said at least one magnetic field probe according to a second sequence, whereby a time dependent probe signal is repeatedly acquired from each magnetic field probe during a probe acquisition time window, thus providing at least one time dependent probe signal; —obtaining said actual gradient impulse response function by calculating an impulse response function from said at least one time dependent probe signal and from said gradient forming sequence part.