利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

345 条记录 (耗时 0.017 秒)

    CHANNEL BY CHANNEL ARTIFACT REDUCTION IN PARALLEL MRI
    81.
    发明公开
    CHANNEL BY CHANNEL ARTIFACT REDUCTION IN PARALLEL MRI 审中-公开
    KANALWEISE ARTEFAKTVERRINGERUNG DER PARALLEL-MRI

    公开(公告)号：EP2856198A1

    公开(公告)日：2015-04-08

    申请号：EP13739793.1

    申请日：2013-06-03

    申请人： Koninklijke Philips N.V.

    发明人： HUANG, Feng ,  LIN, Wei

    IPC分类号： G01R33/561 ,  G01R33/565

    CPC分类号： G01R33/565 ,  G01R33/283 ,  G01R33/385 ,  G01R33/543 ,  G01R33/5611 ,  G01R33/56509

    摘要： An imaging system (5) includes a plurality of coil channel receivers (26) and one or more processors or modules (38). The plurality of coil channel receivers (26) demodulate magnetic resonance data from a multi-channel coil (10) which includes a plurality of coil elements (16) spatially separated, each element transmitting magnetic resonance data on a corresponding channel (25). The one or more processors or modules (38) are configured to detect (26) artifacts in the magnetic resonance data on each channel individually. The one or more processors or modules (38) are further configured to select (27) the magnetic resonance data from the channels which include detected artifacts at or below a threshold artifact level and reconstruct (32) one or more images using the selected magnetic resonance data.

    MR IMAGING WITH SUPPRESSION OF FLOW ARTEFACTS
    82.
    发明公开
    MR IMAGING WITH SUPPRESSION OF FLOW ARTEFACTS 审中-公开
    MR-BILDGEBUNG MITUNTERDRÜCKUNGVON FLUSSARTEFAKTEN

    公开(公告)号：EP2798364A1

    公开(公告)日：2014-11-05

    申请号：EP12813116.6

    申请日：2012-11-26

    申请人： Koninklijke Philips N.V. ,  Philips Deutschland GmbH

    发明人： EGGERS, Holger ,  BÖRNERT, Peter

    IPC分类号： G01R33/565

    CPC分类号： G01R33/56563 ,  G01R33/385 ,  G01R33/4828 ,  G01R33/5616 ,  G01R33/56509 ,  G01R33/56527

    摘要： The invention relates to a method of MR imaging of a body (10) placed in the examination volume of a MR device (1). It is an object of the invention to provide a method that enables efficient compensation of flow artefacts, especially for contrast-enhanced MR angiography in combination with Dixon water/fat separation. The method of the invention comprises the steps of: a) generating at least two gradient echo signals at two different echo times by subjecting the portion of the body (10) to an imaging sequence of RF pulses and switched magnetic field gradients, wherein the 0th moment of the readout magnetic field gradient essentially vanishes at the time of the first gradient echo, the 1st moment of the readout gradient being non-zero at the time of the first gradient echo, while both the 0th and 1st moments of the readout magnetic field gradient essentially vanish at the time of the second gradient echo; b) acquiring the gradient echo signals; c) repeating steps a) and b) for a plurality of phase encoding steps. Moreover, the invention relates to a MR device for carrying out the method of the invention and to a computer program to be run on a MR device; d) reconstructing a first MR image from the gradient echo signals of the first gradient echo and a second MR image from the gradient echo signals of the second gradient echo; and e) identifying ghosting artefacts in the first and/or second MR image by comparing the first and second MR images.

    摘要翻译： 本发明涉及放置在MR装置（1）的检查体积中的身体（10）的MR成像方法。 本发明的目的是提供一种能够有效补偿流动人造物的方法，特别是与Dixon水/脂肪分离相结合的对比度增强型MR血管造影术。 本发明的方法包括以下步骤M：a）通过使身体（10）的一部分经受RF脉冲和切换磁场梯度的成像序列，在两个不同的回波时间产生至少两个梯度回波信号，其中 读出磁场梯度的第0个时刻在第一梯度回波时基本上消失，读出梯度的第一时刻在第一梯度回波时为非零，而读出的第0和第1时刻 磁场梯度在第二梯度回波时基本消失; b）获取梯度回波信号; c）对多个相位编码步骤重复步骤a）和b）。 此外，本发明涉及一种用于执行本发明的方法的MR设备和一种在MR设备上运行的计算机程序; d）根据来自第二梯度回波的梯度回波信号的第一梯度回波的梯度回波信号和第二MR图像重构第一MR图像; 以及e）通过比较第一和第二MR图像来识别第一和/或第二MR图像中的重影伪像。

    Biomedical image reconstruction method
    84.
    发明公开
    Biomedical image reconstruction method 审中-公开
    Verfahren zur Rekonstruktion eines biomedizinischen Bildes

    公开(公告)号：EP2660618A1

    公开(公告)日：2013-11-06

    申请号：EP13166168.8

    申请日：2013-05-02

    申请人： Esaote S.p.A.

    发明人： Balbi, Luca ,  Buonanno, Amedeo ,  Pellegretti, Paolo ,  Serra, Andrea ,  Varriale, Rosario ,  Vicari, Marco

    IPC分类号： G01R33/561 ,  A61B8/08 ,  G01R33/56 ,  G01R33/565

    CPC分类号： A61B8/52 ,  A61B5/055 ,  A61B8/5207 ,  G01R33/5608 ,  G01R33/561 ,  G01R33/56509 ,  G01R33/56563

    摘要： A method of reconstructing an MRI or ultrasound biomedical image, based on compressed sensing and comprising the steps of acquiring several sets of image data from said generated signals, each data set being acquired in a different undersampling scheme and/or a different acquisition mode such as to make expected and unavoidable artifacts incoherent. Each of the acquired image data set is multiplied by a correction matrix Δ, which is calculated from a mathematical model of expected artifacts according to prior knowledge, for adjusting fidelity of the reconstructed image to the corrected acquired image data. For each iteration of said nonlinear iterative algorithm the data sets are processed to generate a combination image which will therefore be faithful to the acquired data but not to the incoherent artifacts.

    摘要翻译： 一种基于压缩感测重建MRI或超声生物医学图像的方法，包括以下步骤：从所述生成的信号获取几组图像数据，每个数据集以不同的欠采样方案和/或不同的采集模式获取，例如 使预期和不可避免的文物不连贯。 将所获取的图像数据集中的每一个乘以校正矩阵“，该校正矩阵”是根据现有知识从预期伪像的数学模型中计算出的，用于调整重建图像与校正后的图像数据的保真度。 对于所述非线性迭代算法的每次迭代，数据集被处理以产生因此将忠实于所获取的数据而不是非相干伪影的组合图像。

    Verfahren für schnelle Spin-Echo MRT Bildgebung
    85.
    发明公开
    Verfahren für schnelle Spin-Echo MRT Bildgebung 审中-公开
    Verfahrenfürschnelle旋转回波MRT Bildgebung

    公开(公告)号：EP2645119A1

    公开(公告)日：2013-10-02

    申请号：EP13161942.1

    申请日：2013-04-02

    申请人： Max-Delbrück-Centrum für Molekulare Medizin Berlin-Buch

    发明人： Niendorf, Thoralf ,  Hezel, Fabian ,  Klix, Sabrina

    IPC分类号： G01R33/561

    CPC分类号： G01R33/56509 ,  G01R33/5611 ,  G01R33/5615 ,  G01R33/5617 ,  G01R33/5676

    摘要： Die Erfindung betrifft ein Magnetresonanztomographie-Verfahren, wobei nach einer Grundanregung und einer Serie von Hochfrequenz-Refokussierungspulsen nach dem Spin-Echo Prinzip zwei Echogruppen entstehen, wobei beide Echogruppen unabhängig voneinander phasenkodiert werden, und wobei die Rekonstruktion für beide Echogruppen unabhängig voneinander erfolgt.

    摘要翻译： 该方法包括通过根据自旋回波原理的两个回波组的一系列激发和射频重聚焦脉冲形成基座，其中一个回波组用于接收用于自身的参考数据集或训练数据集 校准和另一个回波组通过下采样记录。 通过沿着相位编码方向实现独立梯度，独立地对回波组进行相位编码。 回波组被独立重建。