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公开(公告)号：US07403005B2
公开(公告)日：2008-07-22
申请号：US10597060
申请日：2005-01-05
IPC分类号： G01V3/00
CPC分类号： G01R33/4824 , G01R33/5608 , G01R33/5611
摘要： A magnetic resonance imaging apparatus includes a plurality of radio frequency coils (34) that acquire variable density sensitivity encoded data that is undersampled at least away from the center of k-space. A reconstruction processor (52) for each coil reconstructs: a regularization image reconstructed from a higher density portion of the variable density sensitivity encoded data disposed at or near a center of k-space acquired by that coil; and a folded image reconstructed from the variable density sensitivity encoded data acquired by that coil. An unfolding processor (66) unfolds the folded images. The unfolding is regularized by the regularization images.
摘要翻译： 磁共振成像设备包括多个射频线圈（34），其获取至少远离k空间中心的欠采样的可变密度灵敏度编码数据。 每个线圈的重建处理器（52）重建：从由该线圈获取的k空间的中心处或附近的可变密度灵敏度编码数据的较高密度部分重建的正则化图像; 以及从由该线圈获取的可变密度灵敏度编码数据重建的折叠图像。 展开处理器（66）展开折叠的图像。 正规化图像正规化展开。
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公开(公告)号：US20070182412A1
公开(公告)日：2007-08-09
申请号：US10597060
申请日：2005-01-05
IPC分类号： G01V3/00
CPC分类号： G01R33/4824 , G01R33/5608 , G01R33/5611
摘要： A magnetic resonance imaging apparatus includes a plurality of radio frequency coils (34) that acquire variable density sensitivity encoded data that is undersampled at least away from the center of k-space. A reconstruction processor (52) for each coil reconstructs: a regularization image reconstructed from a higher density portion of the variable density sensitivity encoded data disposed at or near a center of k-space acquired by that coil; and a folded image reconstructed from the variable density sensitivity encoded data acquired by that coil. An unfolding processor (66) unfolds the folded images. The unfolding is regularized by the regularization images.
摘要翻译： 磁共振成像设备包括多个射频线圈（34），其获取至少远离k空间中心的欠采样的可变密度灵敏度编码数据。 每个线圈的重建处理器（52）重建：从由该线圈获取的k空间的中心处或附近的可变密度灵敏度编码数据的较高密度部分重建的正则化图像; 以及从由该线圈获取的可变密度灵敏度编码数据重建的折叠图像。 展开处理器（66）展开折叠的图像。 正规化图像正规化展开。
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3.发明申请Contrast-enhanced moving table mr arteriography with stochastic sampling of central k-space 审中-公开对比度增强移动表与中央k空间随机抽样的动脉造影公开(公告)号：US20060173276A1
公开(公告)日：2006-08-03
申请号：US10559160
申请日：2004-05-26
申请人： Johan Van Den Brink , Miha Fuderer , Paul Harvey
发明人： Johan Van Den Brink , Miha Fuderer , Paul Harvey
IPC分类号： A61B5/05
CPC分类号： G01R33/56375 , G01R33/5601
摘要： A system is described for the acquisition of a magnetic resonance scan of a subject. The system is particularly useful when the subject which contains a volume of interest which is larger than the field of view of the system and when the scan includes a time dependent signal. The system also comprising a subject support capable of movement relative to the field of view. The system presented is arranged to perform at least a first scan and a second scan, the first scan being arranged so that signal is acquired from the central region of k-space as the subject support is moved through the field of view in a first direction and the second scan being arranged so that signal is acquired from the periphery of k-space as the subject support is moved through the field of view in a second direction.
摘要翻译： 描述了用于获取对象的磁共振扫描的系统。 当包含感兴趣的体积大于系统视野的主体以及扫描包括时间相关信号时，该系统特别有用。 该系统还包括能够相对于视场移动的对象支撑。 所呈现的系统被布置成执行至少第一扫描和第二扫描，第一扫描被布置成使得当主体支架沿第一方向移动通过视场时从k空间的中心区域获取信号 并且第二扫描被布置成使得当主体支架沿着第二方向移动通过视场时，从k空间的周边获取信号。
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公开(公告)号：US20060145696A1
公开(公告)日：2006-07-06
申请号：US10547196
申请日：2004-02-18
申请人： Miha Fuderer , Paul Harvey , Johan Van Den Brink
发明人： Miha Fuderer , Paul Harvey , Johan Van Den Brink
IPC分类号： G01V3/00
CPC分类号： G01R33/56375 , G01R33/5611
摘要： A novel magnetic resonance imaging method is described, for forming an image of an object from a plurality of signals sampled in a restricted homogeneity region of a main magnet field of a magnetic resonance imaging apparatus. A patient disposed on a table is moved continuously through the bore of the main magnet and spins in a predetermined area of the patient are excited by an excitation pulse from a transmitter antenna, such that an image is formed over a region exceeding largely the restricted region. Data is undersampled in the restricted region by means off at least one receiver antenna in a plurality of receive situations being defined as a block of measurements contiguous in time having preserved magnetisation and presaturation conditions within the excited area of the patient. Fold-over artefacts due to said undersampling are unfolded by means of the known sensitivity pattern of the receiver antenna and/or the properties of selected factors determining said receive situations.
摘要翻译： 描述了一种新颖的磁共振成像方法，用于从在磁共振成像装置的主磁场的受限同质区域中采样的多个信号形成物体的图像。 设置在桌子上的患者连续移动通过主磁体的孔并且在患者的预定区域中的旋转被来自发射器天线的激励脉冲激发，使得在超过大部分限制区域的区域上形成图像 。 通过在多个接收情况中的至少一个接收机天线被限定为在时间上相邻的测量块，其在患者的激动区域内保持了磁化和预饱和状态，因此在受限区域中数据被欠采样。 由于所述欠采样引起的折叠伪影通过接收机天线的已知灵敏度图案和/或确定所述接收情况的选定因素的特性而展开。
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5.发明申请Diffusion-weighted parallel imaging with navigator-signal-based phase correction 审中-公开基于导航信号的相位校正的扩散加权并行成像公开(公告)号：US20050036944A1
公开(公告)日：2005-02-17
申请号：US10498634
申请日：2002-12-02
申请人： Johan Van Den Brink , Miha Fuderer
发明人： Johan Van Den Brink , Miha Fuderer
IPC分类号： G01R33/48 , A61B5/055 , G01R33/3415 , G01R33/561 , A61K49/00
CPC分类号： G01R33/3415 , G01R33/5611
摘要： A magnetic resonance imaging method for forming an image of an object from a plurality of signals acquired by an array of multiple receiver antennae, wherein spins are excitated in a part of the object. MR signals are measured along a predetermined trajectory containing a plurality of lines in k-space by application of a read gradient and other gradients. Further, a navigator gradient is applied for the measurement of navigator MR signals and an additional gradient is applied in order to achieve diffusion sensitivity of the MR signal, wherein phase corrections are determined from phases and moduli of the navigator MR signals so as to correct the measured MR signals. An image of the part of the object is determined from the corrected MR signals. The corrected phase is determined from the weighted phase difference between a reference navigator signal for each antenna and the actual navigator MR signal of said antenna.
摘要翻译： 一种磁共振成像方法，用于从由多个接收器天线的阵列获取的多个信号中形成物体的图像，其中在物体的一部分中激发自旋。 通过应用读取梯度和其他梯度，沿着包含k空间中的多条线的预定轨迹测量MR信号。 此外，导航仪梯度被应用于导航器MR信号的测量，并且应用附加梯度以实现MR信号的扩散灵敏度，其中相位校正是从导航器MR信号的相位和模数确定的，以便校正 测量MR信号。 从校正的MR信号确定对象的一部分的图像。 根据每个天线的参考导航器信号与所述天线的实际导航器MR信号之间的加权相位差来确定校正的相位。
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公开(公告)号：US08938281B2
公开(公告)日：2015-01-20
申请号：US13496085
申请日：2010-09-27
IPC分类号： A61B5/05 , G01R33/561 , G01R33/565
CPC分类号： G01R33/5612 , G01R33/246 , G01R33/5659
摘要： The invention relates to a magnetic resonance imaging apparatus including an array of two or more RF antennas for transmitting RF pulses to and receiving MR signals from a subject positioned in an examination volume, and where the RF antennas have spatial transmit and receive sensitivity profiles. The apparatus is configured to control the temporal succession, the phase, and the amplitude of the RF feeding of each individual RF antenna. The apparatus is also configured to determine the phases and amplitudes from the spatial transmit sensitivity profiles of the RF antennas, and reconstruct a MR image from a combination of the received MR signals received via the individual RF antennas and from the spatial receive sensitivity profiles of the RF antennas. Further, the apparatus is configured to determine the spatial transmit sensitivity profiles of the RF antennas from the spatial receive sensitivity profiles of the RF antennas, or vice versa.
摘要翻译： 本发明涉及一种磁共振成像设备，包括两个或更多个RF天线的阵列，用于将RF脉冲发送到定位在检查体积中的被摄体并接收MR信号，并且其中RF天线具有空间发射和接收灵敏度分布。 该装置被配置为控制每个单独RF天线的RF馈送的时间连续性，相位和幅度。 该装置还被配置为根据RF天线的空间发射灵敏度分布来确定相位和振幅，并且从经由各个RF天线接收的接收的MR信号和从RF天线的空间接收灵敏度分布的组合重建MR图像 射频天线。 此外，该装置被配置为根据RF天线的空间接收灵敏度分布来确定RF天线的空间发射灵敏度分布，反之亦然。
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公开(公告)号：US06518760B2
公开(公告)日：2003-02-11
申请号：US09918160
申请日：2001-07-30
申请人： Miha Fuderer , Johan Samuel Van Den Brink , Michel Paul Jurriaan Jurrissen , Arianne Margarethe Corinne Van Muiswinkel , Ulrich Katscher
发明人： Miha Fuderer , Johan Samuel Van Den Brink , Michel Paul Jurriaan Jurrissen , Arianne Margarethe Corinne Van Muiswinkel , Ulrich Katscher
IPC分类号： G01V300
CPC分类号： G01R33/5611 , G01R33/4835
摘要： A magnetic resonance imaging method employs sub-sampled signal acquisition from a number of receiver coils such as surface coils. A full field-of-view magnetic resonance image is reconstructed on the basis of the sensitivity profiles of the receiver coils, for example on the basis of the SENSE technique. The reconstruction is carried out mathematically as an optimization, for example, requiring a minimum noise level in the magnetic resonance image. According to the invention, a priori information is also involved in the reconstruction and the a priori information is taken into account especially as a constraint in optimization.
摘要翻译： 磁共振成像方法采用来自多个接收线圈（例如表面线圈）的子采样信号采集。 基于接收器线圈的灵敏度分布，例如基于SENSE技术，重建完整的视场磁共振图像。 重建在数学上进行为优化，例如要求磁共振图像中的最小噪声电平。 根据本发明，先验信息也涉及重建，并且先验信息被特别地考虑在优化中作为约束。
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公开(公告)号：US20120179023A1
公开(公告)日：2012-07-12
申请号：US13496085
申请日：2010-09-27
IPC分类号： A61B5/055
CPC分类号： G01R33/5612 , G01R33/246 , G01R33/5659
摘要： The invention relates to a magnetic resonance imaging apparatus comprising an array of two or more RF antennas (9) for transmitting RF pulses to and receiving MR signals from a body (7) of a patient positioned in an examination volume (2), the RF antennas (9) having spatial transmit and receive sensitivity profiles. The apparatus is arranged to: control the temporal succession, the phase, and the amplitude of the RF feeding of each individual RF antenna (9), the phases and amplitudes being determined from the spatial transmit sensitivity profiles of the RF antennas (9), and reconstruct a MR image from a combination of the received MR signals received via the individual RF antennas (9) and from the spatial receive sensitivity profiles of the RF antennas (9). The invention proposes that the apparatus is further arranged to: determine the spatial transmit sensitivity profiles of the RF antennas (9) from the spatial receive sensitivity profiles of the RF antennas (9), or determine the spatial receive sensitivity profiles of the RF antennas (9) from the spatial transmit sensitivity profiles of the RF antennas (9).
摘要翻译： 本发明涉及一种磁共振成像设备，其包括用于向位于检查体积（2）中的患者的身体（7）发送RF脉冲并从其接收MR信号的两个或更多个RF天线（9）的阵列，RF 天线（9）具有空间发射和接收灵敏度分布。 该装置被设置为：控制每个单独RF天线（9）的RF馈送的时间连续性，相位和幅度，根据RF天线（9）的空间发射灵敏度分布确定相位和幅度， 并且从经由各个RF天线（9）接收的接收的MR信号和RF天线（9）的空间接收灵敏度分布的组合重建MR图像。 本发明提出，该装置还被布置为：根据RF天线（9）的空间接收灵敏度分布来确定RF天线（9）的空间发射灵敏度分布，或者确定RF天线的空间接收灵敏度分布（ 9）从RF天线（9）的空间发射灵敏度分布图。
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公开(公告)号：US09689941B2
公开(公告)日：2017-06-27
申请号：US13993689
申请日：2011-12-05
IPC分类号： G01R33/3873 , G01R33/24 , G01R33/565 , G01R33/54 , G01R33/34
CPC分类号： G01R33/3873 , G01R33/246 , G01R33/34 , G01R33/34076 , G01R33/543 , G01R33/5659
摘要： Coil elements (18) generate a B1 excitation field in an examination region (14), which B1 excitation field is distorted by patient loading (e.g., wavelength effects). Passive shimming elements (22, 24) are disposed between the coil elements and the subject in order to improve the B1 field uniformity. In one embodiment, passive shimming elements include one or more dielectric rods (55) disposed below the subject which generate no substantial MR proton signal and which have a permittivity of at least 100 and preferably greater than 500. In another embodiment, tubes (24) adjacent each coil element are supplied with a dielectric liquid, a thickness of the dielectric liquid between the coil element and the subject adjusting a phase of the B1 field generated by the coil element. Active B1 shimming may be combined with passive shimming elements (22, 24) to effect an improved RF field homogeneity result.
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公开(公告)号：US20130278262A1
公开(公告)日：2013-10-24
申请号：US13993689
申请日：2011-12-05
IPC分类号： G01R33/3873
CPC分类号： G01R33/3873 , G01R33/246 , G01R33/34 , G01R33/34076 , G01R33/543 , G01R33/5659
摘要： Coil elements (18) generate a B1 excitation field in an examination region (14), which B1 excitation field is distorted by patient loading (e.g., wavelength effects). Passive shimming elements (22, 24) are disposed between the coil elements and the subject in order to improve the B1 field uniformity. In one embodiment, passive shimming elements include one or more dielectric rods (55) disposed below the subject which generate no substantial MR proton signal and which have a permittivity of at least 100 and preferably greater than 500. In another embodiment, tubes (24) adjacent each coil element are supplied with a dielectric liquid, a thickness of the dielectric liquid between the coil element and the subject adjusting a phase of the B1 field generated by the coil element. Active B1 shimming may be combined with passive shimming elements (22, 24) to effect an improved RF field homogeneity result.
摘要翻译： 线圈元件（18）在检查区域（14）中产生B1激励场，其中B1激励场由患者负载变形（例如，波长效应）。 被动调光元件（22,24）设置在线圈元件和被摄体之间，以提高B1场均匀性。 在一个实施例中，被动调光元件包括设置在对象下方的一个或多个介电棒（55），其不产生实质的MR质子信号，并且具有至少100，优选大于500的介电常数。在另一实施例中，管（24） 相邻的每个线圈元件被提供有电介质液体，线圈元件和对象之间的电介质液体的厚度调节由线圈元件产生的B1场的相位。 有源B1匀场可以与被动调光元件（22,24）组合以实现改进的RF场均匀性结果。
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