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1. 发明授权

US09488709B2 Restriction of the imaging region for MRI in an inhomogeneous magnetic field 有权
标题翻译： MRI在不均匀磁场中的成像区域的限制
公开(公告)号：US09488709B2
公开(公告)日：2016-11-08
申请号：US14004823
申请日：2012-02-14
申请人： Johan Michiel Den Harder , Clemens Bos , Ulrike Andrea Blume
发明人： Johan Michiel Den Harder , Clemens Bos , Ulrike Andrea Blume
IPC分类号： G01R33/54 , G01R33/44 , G01R33/565
CPC分类号： G01R33/543 , G01R33/445 , G01R33/56536 , G01R33/56563
摘要： When magnetic resonance imaging in the vicinity of a metallic object (like, for instance, a metal implant), severe spatial perturbations of the static magnetic field occur. In order to suppress the back-folding of distant off-resonant signals into the region of interest, the imaging volume is spatially restricted by selection gradients applied concurrently with the excitation and the refocusing RF pulses in a spin echo sequence. The selection gradient applied during the excitation pulse has an amplitude and/or a polarity different from that of the selection gradient applied during the refocusing pulse so that the respectively selected slices in an off-resonance frequency versus spatial coordinate diagram become tilted with respect to one another. The applied imaging technique may of the SEMAC or MAVRIC type and may incorporate compressed sensing, parallel imaging, fat suppression and/or SVD-based noise reduction.
摘要翻译：当金属物体（例如金属植入物）附近的磁共振成像发生静态磁场的严重空间扰动时。为了抑制远离非共振信号向感兴趣区域的反向折叠，成像体积受空间限制，该选择梯度与自旋回波序列中的激发和重聚焦RF脉冲同时应用。在激励脉冲期间施加的选择梯度具有与在再聚焦脉冲期间施加的选择梯度的幅度和/或极性不同的幅度和/或极性，使得非共振频率对空间坐标图中的分别选择的切片相对于一个倾斜另一个。所应用的成像技术可以是SEMAC或MAVRIC型，并且可以包括压缩感测，平行成像，基于脂肪抑制和/或基于SVD的降噪。

2. 发明申请

US20140002080A1 RESTRICTION OF THE IMAGING REGION FOR MRI IN AN INHOMOGENEOUS MAGNETIC FIELD 有权
标题翻译：磁共振成像磁场的成像区域的限制
公开(公告)号：US20140002080A1
公开(公告)日：2014-01-02
申请号：US14004823
申请日：2012-02-14
申请人： Johan Michell Den Harder , Clemens Bos , Ulrike Andrea Blume
发明人： Johan Michell Den Harder , Clemens Bos , Ulrike Andrea Blume
IPC分类号： G01R33/54
CPC分类号： G01R33/543 , G01R33/445 , G01R33/56536 , G01R33/56563
摘要： The invention relates to magnetic resonance imaging in the vicinity of a metallic object (like, for instance, a metal implant) where severe spatial perturbations of the static magnetic field occur. In order to suppress the back-folding of distant off-resonant signals into the region of interest, the imaging volume is spatially restricted by means of selection gradients applied concurrently with the excitation and the refocusing RF pulses in a spin echo sequence. The selection gradient applied during the excitation pulse has an amplitude and/or a polarity different from that of the selection gradient applied during the refocusing pulse so that the respectively selected slices in an off-resonance frequency versus spatial coordinate diagram become tilted with respect to one another. The applied imaging technique may of the SEMAC or MAVRIC type and may incorporate compressed sensing, parallel imaging, fat suppression and/or SVD-based noise reduction.
摘要翻译：本发明涉及在发生静态磁场的严重空间扰动的金属物体（例如金属植入物）附近的磁共振成像。为了抑制远离非共振信号向感兴趣区域的反向折叠，通过与自旋回波序列中的激发和重聚焦RF脉冲同时施加的选择梯度，成像体积受空间限制。在激励脉冲期间施加的选择梯度具有与在再聚焦脉冲期间施加的选择梯度的幅度和/或极性不同的幅度和/或极性，使得非共振频率对空间坐标图中的分别选择的切片相对于一个倾斜另一个。所应用的成像技术可以是SEMAC或MAVRIC型，并且可以包括压缩感测，平行成像，基于脂肪抑制和/或基于SVD的降噪。

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