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    Systems and methods of simultaneous multi-slice acquisition in magnetic resonance imaging
    3.
    发明授权
    Systems and methods of simultaneous multi-slice acquisition in magnetic resonance imaging 有权

    公开(公告)号：US12078707B2

    公开(公告)日：2024-09-03

    申请号：US17716672

    申请日：2022-04-08

    申请人： GE PRECISION HEALTHCARE LLC

    发明人： Sudhir Ramanna ,  Ramesh Venkatesan

    IPC分类号： G01R33/561 ,  G01R33/483 ,  G06T11/00

    CPC分类号： G01R33/5617 ,  G01R33/4835 ,  G06T11/006

    摘要： A magnetic resonance (MR) acquisition acceleration method is provided. The method includes, for each acquisition of a plurality of acquisitions, generating an excitation radio frequency (RF) pulse that excites a plurality of slices, applying, to a subject by an MR system, the excitation RF pulse, and acquiring MR signals of the plurality of slices. A number of slices in the plurality of slices is not a power of two, wherein generating an excitation RF pulse further includes modulating a base excitation RF pulse with a different modulation function during each acquisition. A number of acquisitions is equal to the number of slices, and MR signals from each acquisition are algebraic combinations of MR signals of individual slices. The method also includes reconstructing MR images of individual slices based on the MR signals from the plurality of acquisitions, and outputting the reconstructed images of the individual slices.

    Correction of Motion Effects in Magnetic Resonance (MR) Data Acquired Using a Magnetic Resonance System
    4.
    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.

    SYSTEM AND METHOD FOR MAGNETIC RESONANCE IMAGING
    5.
    发明公开
    SYSTEM AND METHOD FOR MAGNETIC RESONANCE IMAGING 审中-公开

    公开(公告)号：US20240175952A1

    公开(公告)日：2024-05-30

    申请号：US18437148

    申请日：2024-02-08

    申请人： SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD.

    发明人： Yu DING ,  Yuan ZHENG ,  Qi LIU ,  Jian XU

    IPC分类号： G01R33/483 ,  G01R33/56

    CPC分类号： G01R33/4835 ,  G01R33/5608

    摘要： A system for MRI is provided. The system may obtain a plurality of sets of under-sampled k-space data corresponding to a plurality of frames. Each set of under-sampled k-space data may be acquired simultaneously from a plurality of slice locations of a subject in one of the frames using an MRI scanner. The system may reconstruct a plurality of reference slice images based on the sets of under-sampled k-space data of the plurality of frames. Each of the reference slice images may be representative of one of the slice locations in more than one frame of the frames. The system may further reconstruct a plurality of image series based on the sets of under-sampled k-space data and the reference slice images. Each image series may correspond to one of the slice locations and include a plurality of slice images of the corresponding slice location in the plurality of frames.

    Magnetic resonance imaging apparatus
    7.
    发明授权
    Magnetic resonance imaging apparatus 有权

    公开(公告)号：US11927655B2

    公开(公告)日：2024-03-12

    申请号：US17814950

    申请日：2022-07-26

    申请人： CANON MEDICAL SYSTEMS CORPORATION

    发明人： Hiroki Kondo ,  Masaaki Umeda ,  Masanori Ozaki

    IPC分类号： G01V3/00 ,  G01R33/483 ,  G01R33/56

    CPC分类号： G01R33/4835 ,  G01R33/5608

    摘要： A magnetic resonance imaging apparatus according to an embodiment includes processing circuitry. The processing circuitry sets a pulse sequence to collect plural echo signals by application of a refocusing pulse more than once after application of an excitation pulse once, and collects data on plural slices that are parallel to each other by executing the pulse sequence more than once. The processing circuitry sets the pulse sequence such that a slice thickness for the refocusing pulse becomes larger than a slice thickness for the excitation pulse, and collects the data on the plural slices by executing the pulse sequence without consecutively collecting data on adjacent ones of the plural slices.

    Method for Slice-Specific Correction of Scan Data Recorded for at Least Two Slices Simultaneously by Means of an Echo-Planar Simultaneous Multi-Slice Technique
    9.
    发明公开
    Method for Slice-Specific Correction of Scan Data Recorded for at Least Two Slices Simultaneously by Means of an Echo-Planar Simultaneous Multi-Slice Technique 审中-公开

    公开(公告)号：US20240036142A1

    公开(公告)日：2024-02-01

    申请号：US18227353

    申请日：2023-07-28

    申请人： Siemens Healthcare GmbH

    发明人： Mario Zeller ,  Adam Kettinger

    IPC分类号： G01R33/567 ,  G01R33/483

    CPC分类号： G01R33/5676 ,  G01R33/4833

    摘要： In a method for slice-specific correction of scan data recorded for at least two slices simultaneously of an examination object using an EPI-SMS technique, navigator signals encoded in a slice selection direction using a bipolar readout gradient for the at least two slices temporally after a RF excitation pulse radiated into the examination object and temporally before the recording of scan data to be corrected may be simultaneously recorded. Mean navigator signal(s) from at least two of the recorded navigator signals of a same polarity may be determined. Single-slice navigator signals may be determined based on the mean navigator signal and a navigator signal having been recorded with the same polarity as the mean navigator signal(s), but with a different slice selection encoding. Slice-specific correction data from the single-slice navigator signals may be determined, and scan data may be corrected based on the slice-specific correction data.

    Generic and Dynamic Excitation Pulse for B0 Compensation
    10.
    发明公开
    Generic and Dynamic Excitation Pulse for B0 Compensation 审中-公开

    公开(公告)号：US20240036132A1

    公开(公告)日：2024-02-01

    申请号：US18226450

    申请日：2023-07-26

    申请人： Siemens Healthcare GmbH

    发明人： David Grodzki ,  Rainer Schneider

    IPC分类号： G01R33/385 ,  G01R33/36 ,  G01R33/44 ,  G01R33/56 ,  G01R33/567 ,  G01R33/483

    CPC分类号： G01R33/385 ,  G01R33/3607 ,  G01R33/443 ,  G01R33/5608 ,  G01R33/5673 ,  G01R33/4833

    摘要： Techniques are provided for operating a magnetic resonance tomography unit. The operation includes determining a B0 field map, determining an excitation of the nuclear spins that is to be achieved, and determining a spectrally selective, generic excitation pulse for transmission by the transmitter via the antenna in dependence upon the B0 field map. The generic excitation pulse is designed to generate the excitation of the nuclear spins that is to be achieved in the patient except for local differences. The operation also comprises determining a spectrally selective, dynamic excitation pulse for transmission by the transmitter via the antenna in dependence upon the B0 field map. The excitation pulse is designed so as to compensate the local differences and thus to generate the excitation of the nuclear spins that is to be achieved in the patient, and outputting the excitation pulse via the antenna.