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公开(公告)号：US08922210B2
公开(公告)日：2014-12-30
申请号：US13077517
申请日：2011-03-31
申请人： Luca Marinelli , Kevin King , Christopher Hardy , Marion Menzel
发明人： Luca Marinelli , Kevin King , Christopher Hardy , Marion Menzel
IPC分类号： G01V3/00 , G01R33/563 , G01R33/561
CPC分类号： G01R33/56341 , G01R33/5611
摘要： A method of generating a magnetic resonance (MR) image of a tissue includes acquiring MR signals at undersampled q-space encoding locations for a plurality of q-space locations that is less than an entirety of the q-space locations sampled at the Nyquist rate, wherein the acquired signal at the q-space locations represents the three-dimensional displacement distribution of the spins in the imaging voxel, synthesizing the MR signal for the entirety of q-space encodings using a compressed sensing technique for a portion of q-space locations at which MR data was not acquired, combining the acquired MR signals at q-space encodings and the synthesized MR signals at q-space encodings to generate a set of MR signals at q-space encodings that are evenly distributed in q-space, using the set of MR signals at q-space encodings to generate a function that represents a displacement probability distribution function of the set of spins in the imaging voxel, and generating an image of the tissue based on at least a portion of the generated function. A system and computer readable medium are also described herein.
摘要翻译： 生成组织的磁共振（MR）图像的方法包括：对于多个q空间位置的欠采样q空间编码位置获取低于以奈奎斯特速率采样的q空间位置的整体的MR信号 ，其中在q空间位置处获取的信号表示成像体素中的自旋的三维位移分布，使用用于q空间的一部分的压缩感测技术来合成用于整个q空间编码的MR信号 不获取MR数据的位置，以q空间编码的采集的MR信号和以q空间编码的合成的MR信号组合，以在均匀分布在q空间中的q空间编码处生成一组MR信号， 使用q空间编码的MR信号集合来生成表示成像体素中的旋转组的位移概率分布函数的函数，并且生成组织基底的图像 在生成的功能的至少一部分上进行编辑。 本文还描述了系统和计算机可读介质。
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公开(公告)号：US07782058B2
公开(公告)日：2010-08-24
申请号：US12110446
申请日：2008-04-28
IPC分类号： G01V3/00
CPC分类号： G01R33/3415 , G01R33/4833 , G01R33/4836 , G01R33/5611
摘要： A system and method for accelerated MR imaging includes a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet, and an RF transceiver system and an RF switch controlled by a pulse module to transmit RF signals to an RF coil assembly comprising at least one RF transmit coil and comprising multiple coils to acquire MR images. The MRI apparatus also has a computer programmed to excite multiple pencil regions by use of an under-sampled echo-planar excitation trajectory and acquire MR signals simultaneously on multiple channels of the RF coil assembly. The computer is also programmed to separate contributions from the various multiple pencil regions by use of parallel imaging reconstruction.
摘要翻译： 用于加速MR成像的系统和方法包括具有围绕磁体的孔定位的多个梯度线圈的磁共振成像（MRI）系统，以及RF收发器系统和由脉冲模块控制的RF开关以将RF信号传输到 RF线圈组件，其包括至少一个RF发射线圈并且包括多个线圈以获取MR图像。 MRI装置还具有被编程为通过使用欠采样的回波平面激发轨迹激发多个铅笔区域并且在RF线圈组件的多个通道上同时获取MR信号的计算机。 计算机还被编程为通过使用并行成像重建来分离来自各种多个铅笔区域的贡献。
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公开(公告)号：US20090256565A1
公开(公告)日：2009-10-15
申请号：US12421266
申请日：2009-04-09
IPC分类号： G01R33/20
CPC分类号： G01R33/561 , G01R33/5608 , G01R33/5611
摘要： A method for reconstructing an image in a magnetic resonance imaging system is provided. The method includes steps of acquiring magnetic resonance signals from a plurality of receiver coils placed about a subject, each receiver coil having a coil sensitivity, iteratively polling each acquired magnetic resonance signal for determining one or more significant wavelet components of each acquired magnetic resonance signal by utilizing a coil sensitivity function of each receiver coil for each acquired magnetic resonance signal, iteratively determining one or more coefficients based on the one or more significant wavelet components to generate a plurality of coefficients for each acquired magnetic resonance signal, reconstructing an image utilizing a corresponding plurality of coefficients corresponding to each acquired magnetic resonance signal, and generating a composite image by combining the reconstructed images.
摘要翻译： 提供了一种用于在磁共振成像系统中重建图像的方法。 该方法包括以下步骤：从放置在被摄体周围的多个接收器线圈获取磁共振信号，每个接收器线圈具有线圈灵敏度，迭代地轮询每个获取的磁共振信号，用于通过以下步骤确定每个获取的磁共振信号的一个或多个有效小波分量： 利用每个接收器线圈对于每个获取的磁共振信号的线圈灵敏度函数，基于所述一个或多个有效小波分量迭代地确定一个或多个系数，以产生用于每个获取的磁共振信号的多个系数，使用相应的 对应于每个获取的磁共振信号的多个系数，以及通过组合重建的图像来生成合成图像。
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4.发明授权Measuring diffusional anisotropy of ODF lobes having maxima peaks and minima troughs with diffusion weighted MRI 有权测量具有扩散加权MRI的具有最大峰值和最小波谷的ODF瓣的扩散各向异性公开(公告)号：US09255979B2
公开(公告)日：2016-02-09
申请号：US13444685
申请日：2012-04-11
IPC分类号： G01R33/563
CPC分类号： G01R33/56341
摘要： A method for measuring diffusional anisotropy in diffusion-weighted magnetic resonance imaging. The method includes determining an orientation diffusion function (ODF) for one or more fibers within a single voxel, wherein the ODF includes lobes representative of a probability of diffusion in a given direction for the one or more fibers. The method also includes characterizing an aspect ratio of the lobes. The method further includes determining a multi-directional anisotropy metric for the one or more fibers based on the aspect ratio of the lobes.
摘要翻译： 扩散加权磁共振成像中扩散各向异性的测量方法。 该方法包括确定单个体素内的一个或多个纤维的取向扩散函数（ODF），其中ODF包括代表一个或多个纤维在给定方向上的扩散概率的裂片。 该方法还包括表征凸角的纵横比。 所述方法还包括基于所述叶的宽高比来确定所述一个或多个光纤的多方向各向异性度量。
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公开(公告)号：US20130271130A1
公开(公告)日：2013-10-17
申请号：US13444685
申请日：2012-04-11
IPC分类号： G01R33/48
CPC分类号： G01R33/56341
摘要： A method for measuring diffusional anisotropy in diffusion-weighted magnetic resonance imaging. The method includes determining an orientation diffusion function (ODF) for one or more fibers within a single voxel, wherein the ODF includes lobes representative of a probability of diffusion in a given direction for the one or more fibers. The method also includes characterizing an aspect ratio of the lobes. The method further includes determining a multi-directional anisotropy metric for the one or more fibers based on the aspect ratio of the lobes.
摘要翻译： 扩散加权磁共振成像中扩散各向异性的测量方法。 该方法包括确定单个体素内的一个或多个纤维的取向扩散函数（ODF），其中ODF包括代表一个或多个纤维在给定方向上的扩散概率的裂片。 该方法还包括表征凸角的纵横比。 所述方法还包括基于所述叶的宽高比来确定所述一个或多个光纤的多方向各向异性度量。
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公开(公告)号：US08160342B2
公开(公告)日：2012-04-17
申请号：US12394398
申请日：2009-02-27
IPC分类号： G06K9/00
CPC分类号： H04N19/635
摘要： A signal processing method include steps initializing a residual data signal representative of an acquired data signal, determining a significant coefficient corresponding to the residual data signal, updating the residual data signal using the significant coefficient to generate updated residual data signal, iteratively determining significant coefficients to generate a plurality of significant coefficients using the updated residual data signal, updating the plurality of significant coefficients by using a successive approximation technique, to improve the numerical accuracy of the significant coefficients and reconstructing a data signal using the updated plurality of significant coefficients.
摘要翻译： 信号处理方法包括步骤：初始化表示所获取的数据信号的残差数据信号，确定对应于残差数据信号的有效系数，使用有效系数更新残差数据信号以产生更新的残留数据信号，迭代地确定有效系数 使用所更新的残差数据信号产生多个有效系数，通过使用逐次逼近技术来更新多个有效系数，以提高有效系数的数值精度并使用更新的多个有效系数重构数据信号。
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公开(公告)号：US07977943B2
公开(公告)日：2011-07-12
申请号：US12421266
申请日：2009-04-09
IPC分类号： G01V3/00
CPC分类号： G01R33/561 , G01R33/5608 , G01R33/5611
摘要： A method for reconstructing an image in a magnetic resonance imaging system is provided. The method includes steps of acquiring magnetic resonance signals from a plurality of receiver coils placed about a subject, each receiver coil having a coil sensitivity, iteratively polling each acquired magnetic resonance signal for determining one or more significant wavelet components of each acquired magnetic resonance signal by utilizing a coil sensitivity function of each receiver coil for each acquired magnetic resonance signal, iteratively determining one or more coefficients based on the one or more significant wavelet components to generate a plurality of coefficients for each acquired magnetic resonance signal, reconstructing an image utilizing a corresponding plurality of coefficients corresponding to each acquired magnetic resonance signal, and generating a composite image by combining the reconstructed images.
摘要翻译： 提供了一种用于在磁共振成像系统中重建图像的方法。 该方法包括以下步骤：从放置在被摄体周围的多个接收器线圈获取磁共振信号，每个接收器线圈具有线圈灵敏度，迭代地轮询每个获取的磁共振信号，用于通过以下步骤确定每个获取的磁共振信号的一个或多个有效小波分量： 利用每个接收器线圈对于每个获取的磁共振信号的线圈灵敏度函数，基于所述一个或多个有效小波分量迭代地确定一个或多个系数，以产生用于每个获取的磁共振信号的多个系数，使用相应的 对应于每个获取的磁共振信号的多个系数，以及通过组合重建的图像来生成合成图像。
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公开(公告)号：US07279893B1
公开(公告)日：2007-10-09
申请号：US11426728
申请日：2006-06-27
IPC分类号： G01V3/00
CPC分类号： G01R33/5611
摘要： An image reconstruction technique determines linear combinations of receiver channel information that contribute the most to image SNR and quantifies the SNR loss for the reduced receiver channel set for image reconstruction to reduce the computational burden placed on the reconstruction engine of an MRI system.
摘要翻译： 图像重建技术确定对图像SNR贡献最大的接收机信道信息的线性组合，并且量化用于图像重构的简化接收机信道集合的SNR损耗，以减少放置在MRI系统的重建引擎上的计算负担。
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公开(公告)号：US08768095B2
公开(公告)日：2014-07-01
申请号：US12541550
申请日：2009-08-14
CPC分类号： G06K9/6232 , G06K9/0057
摘要： A signal processing method is provided. The signal processing method includes the steps of generating undersampled data corresponding to an object, determining a variable thresholding parameter based on a composition of the undersampled data, and iteratively determining thresholded coefficients to generate a plurality of coefficients by utilizing the undersampled data, a current solution and the variable thresholding parameter by updating the variable thresholding parameter and the current solution, and reconstructing a data signal using the plurality of coefficients.
摘要翻译： 提供信号处理方法。 信号处理方法包括以下步骤：产生与对象相对应的欠采样数据，基于欠采样数据的组合确定可变阈值参数，以及迭代确定阈值系数以通过利用欠采样数据产生多个系数，当前解 以及可变阈值参数，通过更新可变阈值参数和当前解，并且使用多个系数重构数据信号。
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公开(公告)号：US20100220908A1
公开(公告)日：2010-09-02
申请号：US12394398
申请日：2009-02-27
CPC分类号： H04N19/635
摘要： A signal processing method include steps initializing a residual data signal representative of an acquired data signal, determining a significant coefficient corresponding to the residual data signal, updating the residual data signal using the significant coefficient to generate updated residual data signal, iteratively determining significant coefficients to generate a plurality of significant coefficients using the updated residual data signal, updating the plurality of significant coefficients by using a successive approximation technique, to improve the numerical accuracy of the significant coefficients and reconstructing a data signal using the updated plurality of significant coefficients.
摘要翻译： 信号处理方法包括步骤：初始化表示所获取的数据信号的残差数据信号，确定对应于残差数据信号的有效系数，使用有效系数更新残差数据信号以产生更新的残留数据信号，迭代地确定有效系数 使用所更新的残差数据信号产生多个有效系数，通过使用逐次逼近技术来更新多个有效系数，以提高有效系数的数值精度并使用更新的多个有效系数重构数据信号。
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