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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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公开(公告)号：US07769425B2
公开(公告)日：2010-08-03
申请号：US11575527
申请日：2005-09-13
申请人： Paul Royston Harvey , Willem Marten Prins , Zhiyong Zhai , Miha Fuderer , Gerrit Hendrik Van Yperen
发明人： Paul Royston Harvey , Willem Marten Prins , Zhiyong Zhai , Miha Fuderer , Gerrit Hendrik Van Yperen
IPC分类号： A61B5/05
CPC分类号： G01R33/543 , G01R33/34046 , G01R33/5612 , G01R33/5659
摘要： A device performs MR imaging of a body (7) placed in a stationary and substantially homogeneous main magnetic field, with an RF transmit antenna (6) for radiating RF pulses towards the body (7), which RF transmit antenna (6) has different resonance modes. In order to improve image uniformity in high field MR imaging, the device (1) is arranged to determine the size and/or the aspect ratio of the body (7), and to acquire an MR image of the body (7) by an imaging sequence including RF pulses. The phases and amplitudes of the different resonance modes of the RF transmit antenna (6) excited during irradiation of the RF pulses are controlled on the basis of the size and/or aspect ratio of the body (7).
摘要翻译： 设备对放置在固定且基本均匀的主磁场中的主体（7）进行MR成像，其中RF射频天线（6）用于向身体（7）辐射RF脉冲，该RF发射天线（6）具有不同的 谐振模式。 为了提高高场MR成像中的图像均匀性，设备（1）被布置成确定身体（7）的尺寸和/或纵横比，并且通过一个 成像序列包括RF脉冲。 基于身体（7）的尺寸和/或纵横比来控制RF辐射照射期间激发的RF发射天线（6）的不同谐振模式的相位和振幅。
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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：US06745064B2
公开(公告)日：2004-06-01
申请号：US09940042
申请日：2001-08-27
申请人： Miha Fuderer , Paul Royston Harvey
发明人： Miha Fuderer , Paul Royston Harvey
IPC分类号： A61B5055
CPC分类号： G01R33/5611 , G01R33/4835
摘要： A magnetic resonance method is described for fast dynamic imaging from a plurality of signals acquired by an array of multiple sensors. The k-space will be segmented into regions of different acquisition. In the region of a first acquisition type a first partial image will be reconstructed by data of normal magnetic resonance imaging with a full set of phase encoding steps or by data of fast dynamic imaging with a number of phase encoding steps being with a low reduction factor with respect to the fall set thereof and in the region of a second acquisition type a second partial image will be reconstructed by data of fast dynamic imaging with a full reduction factor. Thereafter the first and the second partial images will be formed to the full image of the scanned object.
摘要翻译： 描述了由多个传感器阵列获取的多个信号的快速动态成像的磁共振方法。 k空间将被分割成不同采集区域。 在第一采集类型的区域中，通过具有全套相位编码步骤的正常磁共振成像的数据或通过具有低缩减因子的多个相位编码步骤的快速动态成像数据来重构第一部分图像 相对于其下降组合，并且在第二获取类型的区域中，将通过具有完全缩小因子的快速动态成像的数据来重建第二部分图像。 此后，第一和第二部分图像将被形成为扫描对象的完整图像。
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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：US07417429B2
公开(公告)日：2008-08-26
申请号：US10547196
申请日：2004-02-18
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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公开(公告)号：US06448771B1
公开(公告)日：2002-09-10
申请号：US09918159
申请日：2001-07-30
申请人： Paul Royston Harvey , Miha Fuderer
发明人： Paul Royston Harvey , Miha Fuderer
IPC分类号： G01V300
CPC分类号： G01R33/5611 , G01R33/4835 , G01R33/56308
摘要： A magnetic resonance method is described for forming a fast dynamic image from a plurality of signals acquired by an array of multiple sensors. The k-space is segmented into regions of different type of acquisition. In the region of a first acquisition type a first partial image is reconstructed by data of normal magnetic resonance imaging with a full set of phase encoding steps or by data of fast dynamic imaging with a number of phase encoding steps with a low reduction factor with respect to the full set thereof, and in the region of a second acquisition type a second partial image is reconstructed by data of fast dynamic imaging with a full reduction factor. The first and the second partial images are subsequently combined so as to form the full image of the scanned object.
摘要翻译： 描述了从由多个传感器阵列获取的多个信号形成快速动态图像的磁共振方法。 k空间被分割成不同类型的采集区域。 在第一采集类型的区域中，通过具有全套相位编码步骤的正常磁共振成像的数据或通过具有相对低的缩小因子的多个相位编码步骤的快速动态成像数据来重建第一部分图像 在其全部集合中，并且在第二获取类型的区域中，通过具有完全缩减因子的快速动态成像的数据来重建第二部分图像。 随后组合第一和第二部分图像以形成扫描对象的完整图像。
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公开(公告)号：US07208949B2
公开(公告)日：2007-04-24
申请号：US10542828
申请日：2003-12-15
申请人： Miha Fuderer
发明人： Miha Fuderer
IPC分类号： G01V3/00
CPC分类号： G01R33/56518 , G01R33/5611 , G01R33/56563
摘要： A magnetic resonance imaging method is presented for forming an image of an object, wherein a stationary magnetic field and temporary magnetic fields having a position dependent field pattern are applied, magnetic resonance signals are acquired by at least one receiver antenna, spins are excitated in a part of the object, MR signals are acquired during application of the position-dependent field patterns (G1, G2, . . . ) and a magnetic resonance image is derived from the sampled magnetic resonance signals. The field patterns are substantially non-linear, the number N of total field patterns is larger than 3, and at least N−1 field patterns are independently controllable in field strength. The magnetic resonance signals are acquired in a sub-sampling fashion.
摘要翻译： 提出了用于形成物体的图像的磁共振成像方法，其中施加具有位置相关磁场图案的固定磁场和临时磁场，通过至少一个接收器天线获取磁共振信号，旋转在 在对象的一部分中，在施加位置相关的场图案（G 1，G 2，...）期间获取MR信号，并且从采样的磁共振信号导出磁共振图像。 场图案基本上是非线性的，总场图案的数量N大于3，并且至少N-1场图案在场强中是独立可控的。 以次采样的方式获取磁共振信号。
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公开(公告)号：US06897653B2
公开(公告)日：2005-05-24
申请号：US09992699
申请日：2001-11-14
IPC分类号： G01R33/36 , A61B5/055 , G01R33/565 , G01V3/00
CPC分类号： G01R33/56518
摘要： In a magnetic resonance imaging method flow quantities and diffusion quantities are measured in the presence of temporary magnetic gradient fields (gradient pulses). Signal amplitudes of the magnetic resonance signals and/or flow and diffusion quantities calculated from the magnetic resonance signals are corrected for non-linearities in the magnetic gradient fields.
摘要翻译： 在磁共振成像方法中，在临时磁梯度场（梯度脉冲）的存在下测量流量和扩散量。 根据磁共振信号计算的磁共振信号和/或流量和扩散量的信号幅度被校正为磁梯度场中的非线性。
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