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    MRI METHOD FOR DETERMINING A MAGNETIC FIELD MAP FROM A B0 REFERENCE SCAN AND A WASSR SCAN
    3.
    发明公开
    MRI METHOD FOR DETERMINING A MAGNETIC FIELD MAP FROM A B0 REFERENCE SCAN AND A WASSR SCAN 审中-公开

    公开(公告)号：EP3511726A1

    公开(公告)日：2019-07-17

    申请号：EP18151457.1

    申请日：2018-01-12

    Applicant: Koninklijke Philips N.V.

    Inventor： DE WEERDT, Elwin

    IPC: G01R33/24 ,  G01R33/48 ,  G01R33/56 ,  G01R33/561

    Abstract: The invention provides for a medical imaging system (100, 300). The medical imaging system (100, 300) comprises a processor (104). Execution of machine executable instructions (120) causes the processor (104) to: receive magnetic resonance data, wherein the magnetic resonance data comprises B0 field data (122) of a reference scan for a plurality of voxels and water saturation data (124) of a WASSR scan for a subset of voxels of the plurality of voxels, the water saturation data (124) comprising data of a limited number of sample points; determine a local absolute water saturation frequency (130) for each voxel of the subset using the water saturation data (124) of the WASSR scan; and reconstruct a field map (132) comprising a local absolute water saturation frequency for each voxel of the plurality of voxel, wherein the reconstruction comprises determining relative frequency differences between the voxels using the B0 field data (122) of the reference scan and adding a frequency offset to the relative frequency differences based on the determined local absolute water saturation frequencies (130) of the subset.

    PROPELLER MAGNETIC RESONANCE IMAGING
    4.
    发明公开
    PROPELLER MAGNETIC RESONANCE IMAGING 审中-公开
    螺旋桨MAGNETRESONANZBILDGEBUNG

    公开(公告)号：EP3123191A1

    公开(公告)日：2017-02-01

    申请号：EP15712843.0

    申请日：2015-03-20

    Applicant: Koninklijke Philips N.V.

    Inventor： DE WEERDT, Elwin

    IPC: G01R33/48 ,  G01R33/561

    CPC classification number: G01R33/5611 ,  G01R33/4818 ,  G01R33/4824

    Abstract: The invention provides for a magnetic resonance imaging system (100) configured for acquiring magnetic resonance data (142) from an imaging zone (108) according to a PROPELLER magnetic resonance imaging protocol. The pulse sequence is configured such that the pulse sequence data for each of the multiple blades of magnetic resonance data comprises coil specific magne tic resonance data (146, 146', 146", 146" ') acquired for each of multiple antenna elements simultaneously (126, 126', 126", 126" '). The magnetic resonance imaging system is further configured to perform the following for each blade: reconstruct (214) a blade image (150, 150') from the coil specific magnetic resonance data for each antenna element according to a parallel imaging magnetic resonance imaging protocol, construct (218) a Chi map (154, 154') for the blade image using the set of coil sensitivities, the blade image, and the coil specific magnetic resonance data.

    Abstract translation: 本发明提供一种配置成根据PROPELLER磁共振成像协议从成像区域（108）获取磁共振数据（142）的磁共振成像系统（100）。 脉冲序列被配置为使得多个磁共振数据中的每一个的脉冲序列数据包括同时为多个天线元件中的每一个获取的线圈特定磁共振数据（146,146'，146“，146”）（126 ，126'，126“，126'”）。 磁共振成像系统还被配置为对每个叶片执行以下操作：根据平行成像磁共振成像协议从每个天线元件的线圈特定磁共振数据重建（214）刀片图像（150,150'）， 使用线圈灵敏度集合，叶片图像和线圈特定磁共振数据构造（218）用于叶片图像的Chi图（154,154'）。

    MOTION ESTIMATION AND CORRECTION IN MAGNETIC RESONANCE IMAGING
    5.
    发明公开
    MOTION ESTIMATION AND CORRECTION IN MAGNETIC RESONANCE IMAGING 审中-公开

    公开(公告)号：EP3913387A1

    公开(公告)日：2021-11-24

    申请号：EP20175350.6

    申请日：2020-05-19

    Applicant: Koninklijke Philips N.V.

    Inventor： DE WEERDT, Elwin ,  PEZZOTTI, Nicola

    IPC: G01R33/565 ,  G06N3/02

    Abstract: Disclosed herein is a method of medical imaging comprising receiving (200) k-space data (124) that is divided into multiple k-space data groups (126). The method further comprises selecting (202) one of the multiple k-space data groups as a reference k-space data group (128). The method further comprises calculating (204) spatial transform data (130) for each of the multiple k-space data groups by inputting the multiple k-space data groups and the reference k-space data group into a transformation estimation module. The spatial transformation estimation module is configured for outputting spatial transform data descriptive of a spatial transform between a reference k-space data group and multiple k-space data groups in response to receiving the reference k-space data group and the multiple k-space data groups as input. The method further comprises reconstructing (206) a corrected magnetic resonance image (132, 132') according to the magnetic resonance imaging protocol using the multiple k-space data groups and the spatial transform data for each of the multiple k-space data groups.

    MULTI-ECHO MR IMAGING WITH SPIRAL ACQUISITION
    6.
    发明公开
    MULTI-ECHO MR IMAGING WITH SPIRAL ACQUISITION 审中-公开

    公开(公告)号：EP3745152A1

    公开(公告)日：2020-12-02

    申请号：EP19176859.7

    申请日：2019-05-28

    Applicant: Koninklijke Philips N.V.

    Inventor： FUDERER, Miha ,  DE WEERDT, Elwin

    IPC: G01R33/48 ,  G01R33/56

    Abstract: The invention relates to a method of MR imaging of an object (10) positioned in an examination volume of a MR device (1). It is an object of the invention to enable fast spiral MR imaging with a defined T 2 contrast. The method of the invention comprises the following steps:
    - generating a number of spin echoes by subjecting the object (10) to one or more shots of an imaging sequence, each shot comprising an RF excitation pulse (21) followed by a number of RF refocusing pulses (22), wherein modulated readout magnetic field gradients (23, 24) are applied in each interval between successive RF refocusing pulses (22),
    - acquiring MR signal data, wherein each spin echo is recorded along a spiral trajectory (31-33, 41-43) in k-space which winds around the k-space origin with varying radial distance, wherein the trajectory (31, 41) of at least one spin echo has a different rate of variation of the radial distance at least in a central k-space region compared to the trajectories (32, 33, 42, 43) of the other spin echoes, and
    - reconstructing an MR image from the acquired MR signal data.
    Moreover, the invention relates to an MR device (1) and to a computer program for an MR device (1).

    PARALLEL MR IMAGING WITH NYQUIST GHOST CORRECTION FOR EPI
    8.
    发明公开
    PARALLEL MR IMAGING WITH NYQUIST GHOST CORRECTION FOR EPI 审中-公开
    并行MR成像与NYQUIST对EPI的GHOST校正

    公开(公告)号：EP3183594A1

    公开(公告)日：2017-06-28

    申请号：EP15751013.2

    申请日：2015-08-18

    Applicant: Koninklijke Philips N.V.

    Inventor： DE WEERDT, Elwin ,  CHEN, Zhaolin

    IPC: G01R33/561 ,  G01R33/565

    CPC classification number: G01R33/5611 ,  G01R33/56545 ,  G01R33/56554

    Abstract: The invention relates to a method of parallel MR imaging. The method comprises the steps of: a) subjecting the portion of the body (10) to an imaging sequence of at least one RF pulse and a plurality of switched magnetic field gradients, wherein MR signals are acquired in parallel via a plurality of RF coils (11, 12, 13) having different spatial sensitivity profiles within the examination volume, b) deriving an estimated ghost level map from the acquired MR signals and from spatial sensitivity maps of the RF coils (11, 12, 13), c) reconstructing a MR image from the acquired MR signals, the spatial sensitivity maps, and the estimated ghost level map. Moreover, the invention relates to a MR device (1) and to a computer program for a MR device (1).

    Abstract translation: 平行MR成像的方法。 该方法包括以下步骤：a）使身体部分（10）经受至少一个RF脉冲和多个切换磁场梯度的成像序列，其中MR信号经由多个RF线圈并行采集 （11,12,13），其具有检查体积内的不同空间灵敏度分布，b）从所采集的MR信号和RF线圈（11,12,13）的空间灵敏度图导出估计的重影水平图，c）重建 来自所采集的MR信号的MR图像，空间敏感度图以及估计的重影图图。 此外，本发明涉及MR设备（1）和用于MR设备（1）的计算机程序。

    DETERMINIATON OF B0 INHOMOGENEITY IN MAGNETIC RESONANCE IMAGING
    9.
    发明公开
    DETERMINIATON OF B0 INHOMOGENEITY IN MAGNETIC RESONANCE IMAGING 审中-公开

    公开(公告)号：EP4306980A1

    公开(公告)日：2024-01-17

    申请号：EP22187466.2

    申请日：2022-07-28

    Applicant: Koninklijke Philips N.V.

    Inventor： BORUP, Daniel Duffy ,  DE WEERDT, Elwin ,  PEZZOTTI, Nicola

    IPC: G01R33/24 ,  G01R33/56 ,  G01R33/565

    Abstract: Disclosed herein is a medical system (100, 300) comprising a memory (110) storing machine executable instructions (120) and a convolutional neural network (122) configured for outputting a predetermined number of deblurred magnetic resonance images (126) that are slices of a deblurred magnetic resonance imaging data set in response to receiving a set of partially deblurred magnetic resonance images for each of the slices. The execution of the machine executable instructions causes a computational system (104) to: receive (200) the set of partially deblurred magnetic resonance images; receive (202) the predetermined number of deblurred magnetic resonance images in response to inputting the set of partially deblurred magnetic resonance images for each of the slices into the convolutional neural network; calculate (204) a set of difference images (128) for each of the slices by calculating a difference between the deblurred magnetic resonance image and each of the set of partially deblurred magnetic resonance images; and calculate (206) a determined B0 inhomogeneity map (130) for each of the slices by fitting a smooth manifold to B0 values determined from the set of difference images, the demodulation frequency map, and the assigned demodulating frequency for each of the set of difference images.

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