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公开(公告)号：US09014781B2
公开(公告)日：2015-04-21
申请号：US13451178
申请日：2012-04-19
申请人： Ek Tsoon Tan , Thomas Kwok-Fah Foo , Vincent B. Ho
发明人： Ek Tsoon Tan , Thomas Kwok-Fah Foo , Vincent B. Ho
CPC分类号： A61B5/055 , A61B5/0263
摘要： Systems and methods for Magnetic Resonance Angiography (MRI) are provided. One method includes obtaining Magnetic Resonance (MR) velocity data and determining a distance map for one or more vessels to define a distance path. The method also includes calculating, using the MR velocity data, at a plurality of time intervals and for a plurality of pixels (i) a distance traveled during a current time interval as a current distance traveled, wherein a total distance traveled is incremented by the current distance traveled and (ii) a bolus signal using a bolus signal profile, the distance path and total distance traveled, wherein a current time interval is incremented by a defined time step.
摘要翻译： 提供了磁共振血管造影（MRI）的系统和方法。 一种方法包括获得磁共振（MR）速度数据并且确定一个或多个容器的距离图以限定距离路径。 该方法还包括以多个时间间隔和多个像素（i）计算使用MR速度数据在当前时间间隔内行进的距离作为行进的当前距离，其中行进的总距离增加 当前距离行进，以及（ii）使用推注信号轮廓的推注信号，所述距离路径和所行驶的总距离，其中当前时间间隔增加定义的时间步长。
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公开(公告)号：US20130281829A1
公开(公告)日：2013-10-24
申请号：US13451178
申请日：2012-04-19
申请人： Ek Tsoon Tan , Thomas Kwok-Fah Foo , Vincent B. Ho
发明人： Ek Tsoon Tan , Thomas Kwok-Fah Foo , Vincent B. Ho
IPC分类号： A61B5/055
CPC分类号： A61B5/055 , A61B5/0263
摘要： Systems and methods for Magnetic Resonance Angiography (MRI) are provided. One method includes obtaining Magnetic Resonance (MR) velocity data and determining a distance map for one or more vessels to define a distance path. The method also includes calculating, using the MR velocity data, at a plurality of time intervals and for a plurality of pixels (i) a distance traveled during a current time interval as a current distance traveled, wherein a total distance traveled is incremented by the current distance traveled and (ii) a bolus signal using a bolus signal profile, the distance path and total distance traveled, wherein a current time interval is incremented by a defined time step.
摘要翻译： 提供了磁共振血管造影（MRI）的系统和方法。 一种方法包括获得磁共振（MR）速度数据并且确定一个或多个容器的距离图以限定距离路径。 该方法还包括以多个时间间隔和多个像素（i）计算使用MR速度数据在当前时间间隔内行进的距离作为行进的当前距离，其中行进的总距离增加 当前距离行进，以及（ii）使用推注信号轮廓的推注信号，所述距离路径和所行驶的总距离，其中当前时间间隔增加定义的时间步长。
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3.发明申请System and Method for Embedded Self-Calibration within an Inversion Recovery Pulse Sequence 有权反向恢复脉冲序列内嵌入式自校准的系统和方法公开(公告)号：US20100182008A1
公开(公告)日：2010-07-22
申请号：US12690756
申请日：2010-01-20
申请人： Ek Tsoon Tan , Stephen J. Riederer
发明人： Ek Tsoon Tan , Stephen J. Riederer
IPC分类号： G01R33/48
CPC分类号： G01R33/5611 , G01R33/243 , G01R33/5602
摘要： An improved self-calibration method for accelerated magnetic resonance imaging (MRI) using inversion recovery pulse sequences allows calibration data for determining coil sensitivity profiles to be acquired by employing a calibration pulse sequence within the delay time of an inversion recovery pulse sequence. The calibration pulse sequence includes a constrained number of calibration pulses having small flip angles so that acceptable longitudinal magnetization recovery is provided.
摘要翻译： 使用反转恢复脉冲序列的改进的用于加速磁共振成像（MRI）的自校准方法允许通过在反转恢复脉冲序列的延迟时间内采用校准脉冲序列来获得用于确定线圈灵敏度分布的校准数据。 校准脉冲序列包括具有小翻转角的受限数量的校准脉冲，从而提供可接受的纵向磁化恢复。
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4.发明申请IMAGE CORRECTION USING MULTICHANNEL BLIND DECONVOLUTION WITH HOMOMORPHIC FILTERING 有权使用多通道盲解卷积与均匀滤波的图像校正公开(公告)号：US20130281822A1
公开(公告)日：2013-10-24
申请号：US13451239
申请日：2012-04-19
IPC分类号： A61B5/055
CPC分类号： A61B5/055
摘要： A method includes obtaining a plurality of magnetic resonance (MR) coil images of a subject of interest, each MR coil image being generated from one of an array of MR receiving coils; combining the plurality of coil images to generate an image estimate of the subject of interest; performing a multichannel blind deconvolution (MBD) process including: deriving coil sensitivity information for every one of the array of MR receiving coils based on the image estimate or a filtered image estimate derived from the image estimate; updating the image estimate or the filtered image estimate using the derived coil sensitivity information to generate an updated image estimate; and applying a homomorphic filter to the image estimate to derive the filtered image estimate, or to the updated image estimate to derive a filtered updated image estimate, or a combination thereof.
摘要翻译： 一种方法包括获得感兴趣对象的多个磁共振（MR）线圈图像，每个MR线圈图像从MR接收线圈的阵列之一产生; 组合多个线圈图像以产生感兴趣对象的图像估计; 执行多通道盲解卷积（MBD）处理，包括：基于所述图像估计或从所述图像估计导出的滤波图像估计，导出所述MR接收线圈阵列中的每一个的线圈灵敏度信息; 使用导出的线圈灵敏度信息来更新图像估计或滤波图像估计以产生更新的图像估计; 以及将同态滤波器应用于所述图像估计以导出所述滤波图像估计，或对所述更新的图像估计来推导滤波的更新图像估计，或其组合。
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5.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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6.发明授权Image correction using multichannel blind deconvolution with homomorphic filtering 有权使用具有同态滤波的多通道盲解卷积的图像校正公开(公告)号：US08868153B2
公开(公告)日：2014-10-21
申请号：US13451239
申请日：2012-04-19
CPC分类号： A61B5/055
摘要： A method includes obtaining a plurality of magnetic resonance (MR) coil images of a subject of interest, each MR coil image being generated from one of an array of MR receiving coils; combining the plurality of coil images to generate an image estimate of the subject of interest; performing a multichannel blind deconvolution (MBD) process including: deriving coil sensitivity information for every one of the array of MR receiving coils based on the image estimate or a filtered image estimate derived from the image estimate; updating the image estimate or the filtered image estimate using the derived coil sensitivity information to generate an updated image estimate; and applying a homomorphic filter to the image estimate to derive the filtered image estimate, or to the updated image estimate to derive a filtered updated image estimate, or a combination thereof.
摘要翻译： 一种方法包括获得感兴趣对象的多个磁共振（MR）线圈图像，每个MR线圈图像从MR接收线圈的阵列之一产生; 组合多个线圈图像以产生感兴趣对象的图像估计; 执行多通道盲解卷积（MBD）处理，包括：基于所述图像估计或从所述图像估计导出的滤波图像估计，导出所述MR接收线圈阵列中的每一个的线圈灵敏度信息; 使用导出的线圈灵敏度信息来更新图像估计或滤波图像估计以产生更新的图像估计; 以及将同态滤波器应用于所述图像估计以导出所述滤波图像估计，或对所述更新的图像估计来推导滤波的更新图像估计，或其组合。
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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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8.发明授权System and method for embedded self-calibration within an inversion recovery pulse sequence 有权在反向恢复脉冲序列内进行嵌入式自校准的系统和方法公开(公告)号：US08334694B2
公开(公告)日：2012-12-18
申请号：US12690756
申请日：2010-01-20
申请人： Ek Tsoon Tan , Stephen J Riederer
发明人： Ek Tsoon Tan , Stephen J Riederer
IPC分类号： G01V3/00
CPC分类号： G01R33/5611 , G01R33/243 , G01R33/5602
摘要： An improved self-calibration method for accelerated magnetic resonance imaging (MRI) using inversion recovery pulse sequences allows calibration data for determining coil sensitivity profiles to be acquired by employing a calibration pulse sequence within the delay time of an inversion recovery pulse sequence. The calibration pulse sequence includes a constrained number of calibration pulses having small flip angles so that acceptable longitudinal magnetization recovery is provided.
摘要翻译： 使用反转恢复脉冲序列的改进的用于加速磁共振成像（MRI）的自校准方法允许通过在反转恢复脉冲序列的延迟时间内采用校准脉冲序列来获得用于确定线圈灵敏度分布的校准数据。 校准脉冲序列包括具有小翻转角的受限数量的校准脉冲，从而提供可接受的纵向磁化恢复。
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