利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

245 条记录 (耗时 0.027 秒)

    Correction of Motion Effects in Magnetic Resonance (MR) Data Acquired Using a Magnetic Resonance System
    1.
    发明公开
    Correction of Motion Effects in Magnetic Resonance (MR) Data Acquired Using a Magnetic Resonance System 审中-公开

    公开(公告)号：US20240219503A1

    公开(公告)日：2024-07-04

    申请号：US18524260

    申请日：2023-11-30

    申请人： Siemens Healthcare GmbH

    发明人： Mario Zeller

    IPC分类号： G01R33/565 ,  G01R33/483

    CPC分类号： G01R33/56509 ,  G01R33/483

    摘要： Method including: a) loading sets of multislice MR data acquired simultaneously from identical slices of a subject, the slices are encoded with different phase patterns for each set of multislice MR data; b) separating the sets of multislice MR data into first single-slice MR data of the slices; c) determining slice-specific calibration data for a parallel imaging method for separating simultaneously acquired slices based on the first single-slice MR data; d) using the determined calibration data and an associated parallel imaging method for separating simultaneously acquired slices, separating each of the sets of multislice MR data into second single-slice MR data of the slices; e) determining motion correction parameters based on the second single-slice MR data, for compensating for motion effects between the sets of multislice MR data; and f) determining one motion-corrected set of multislice MR data each per set of multislice MR data using the motion correction parameters.

    NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY
    4.
    发明申请
    NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 审中-公开

    公开(公告)号：US20190195974A1

    公开(公告)日：2019-06-27

    申请号：US16331687

    申请日：2017-06-23

    申请人： UNIVERSITEIT GENT

    发明人： Hacene SERRAI ,  Eric ACHTEN ,  Sourav BHADURI

    IPC分类号： G01R33/485 ,  G01R33/56 ,  G01R33/565

    CPC分类号： G01R33/485 ,  G01R33/483 ,  G01R33/5608 ,  G01R33/56509 ,  G01R33/56527

    摘要： A method is provided for performing NMR spectroscopy. The method comprises positioning a sample in a homogeneous stationary magnetic field directed along an axis, preparing nuclei in at least a predetermined volume of the sample for resonant emission of an NMR signal and creating this NMR signal. This comprises irradiating the sample with at least one RF excitation pulse in accordance with an MRI sequence preparation and/or evolution module. The method also comprises sensing the NMR signal in the absence of frequency encoding magnetic field gradients such that analysis of the NMR signal yields a chemical shift spectrum from the nuclei. During this sensing, a plurality of intermittently blipped phase gradient pulses are applied to incrementally shift a position in k-space such that different time segments of the NMR signal, demarcated by the blipped phase gradient pulses, correspond to different predetermined locations in k-space.

    METHOD OF GENERATING MULTI-BAND RF PULSES
    7.
    发明申请
    METHOD OF GENERATING MULTI-BAND RF PULSES 审中-公开

    公开(公告)号：US20170276751A1

    公开(公告)日：2017-09-28

    申请号：US15512085

    申请日：2015-08-17

    申请人： KONINKLIJKE PHILIPS N.V.

    发明人： BIN XIE ,  ARTHUR FELIPE NISTI GRIGOLETTO BORGONOVI ,  ZHAOLIN CHEN ,  MIHA FUDERER

    IPC分类号： G01R33/48 ,  G01R33/561 ,  G01R33/565 ,  G01R33/54 ,  G01R33/483

    CPC分类号： G01R33/4816 ,  G01R33/483 ,  G01R33/4835 ,  G01R33/54 ,  G01R33/543 ,  G01R33/561 ,  G01R33/565 ,  G01R33/5659

    摘要： The present invention relates to a method for side-band suppression in a Magnetic Resonance imaging, MRI, system (100), the method comprising providing a first multiband RF pulse for simultaneously exciting at least two slices in a subject (118) at a first and a second frequency band (301,303) and to acquire using the MRI system (100) signals (307, 308) from the excited two slices and at least one additional signal (309) at a third frequency band (305), the additional signal (309) resulting from a sideband excitation of a slice different from the two slices; using the first multiband RF pulse for determining the additional signal (309); deriving a pre-compensating term from the first multiband RF pulse and the additional signal (309), adding the pre-compensating term to the first multiband RF pulse to obtain a second multiband RF pulse, thereby replacing the first multiband RF pulse by the second multiband RF pulse for suppressing at least part of the additional signal (309).