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21.发明申请公开(公告)号：US20120013337A1
公开(公告)日：2012-01-19
申请号：US13258622
申请日：2010-03-31
IPC分类号： G01R33/44
CPC分类号： G01R33/3415 , G01R33/288 , G01R33/543 , G01R33/5612 , G01R33/5659
摘要： A magnetic resonance sequence includes a repetitively applied radiofrequency B1 pulse capable of causing a specific absorption rate (SAR) hot spot. The composition of the repetitive B1 pulse is varied to generate versions of the repetitive B1 pulse such that the SAR hot spot changes locations with subsequent applications of the repetitive B1 pulse. To generate versions of the B1 pulse, a pilot scan is performed to generate a patient model. A simulation of the SAR response to each of the versions of the repetitive B1 pulse is performed to determine the location of SAR hot spot(s). A plurality of versions of the repetitive B1 pulse is selected to be used in the magnetic resonance sequence.
摘要翻译： 磁共振序列包括能够引起比吸收率（SAR）热点的重复施加的射频B1脉冲。 改变重复B1脉冲的组成以产生重复B1脉冲的形式，使得SAR热点随后应用重复的B1脉冲而改变位置。 为了生成B1脉冲的版本，执行导频扫描以产生患者模型。 执行对每个重复B1脉冲版本的SAR响应的模拟，以确定SAR热点的位置。 选择在磁共振序列中使用多个版本的重复B1脉冲。
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公开(公告)号：US20100256477A1
公开(公告)日：2010-10-07
申请号：US11993028
申请日：2006-06-21
IPC分类号： A61B5/055
CPC分类号： G01R33/3415 , G01R33/3635
摘要： The invention relates to an MR device (1) for magnetic resonance imaging of a body (14) placed in an examination volume (7), the device (1) comprising a main magnet (2) for generating a stationary and substantially homogeneous main magnetic field in the examination volume (7), and an RF coil arrangement for generating RF fields in the examination volume (7) and/or for receiving MR signals from the body (14). In order to provide such an MR device, which is arranged to operate at the resonance (Larmor) frequencies of two or more different nuclear species at the same time, the invention suggests that the RF coil arrangement comprises a plurality of independent resonator elements (8, 9, 10, 11, 12, 13) which are adjacently arranged in or near the examination volume (7), wherein adjacent resonator elements (8, 9, 10, 11, 12, 13) are alternately tuned to one of two or more different MR resonance frequencies, and wherein each resonator element (8, 9, 10, 11, 12, 13) is associated with a separate signal transmission (16) and/or signal reception channel (17) of the MR device (1)
摘要翻译： 本发明涉及用于放置在检查体积（7）中的体（14）的磁共振成像的MR装置（1），所述装置（1）包括主磁体（2），用于产生静止且基本均匀的主磁 在检查体积（7）中的场和用于在检查体积（7）中产生RF场和/或用于从身体（14）接收MR信号的RF线圈装置。 为了提供这样的MR器件，其被布置为在同时在两个或更多个不同核物质的共振（Larmor）频率下操作，本发明提出RF线圈装置包括多个独立的谐振器元件（8 ，9,10,11,12,13），其相邻地布置在检查体积（7）中或附近，其中相邻的谐振器元件（8,9,10,11,12,13）交替地被调谐到两个或 更多不同的MR谐振频率，并且其中每个谐振器元件（8,9,10,11,12,13）与MR装置（1）的单独的信号传输（16）和/或信号接收通道（17）相关联，
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公开(公告)号：US07061240B2
公开(公告)日：2006-06-13
申请号：US10496489
申请日：2002-11-20
IPC分类号： G01V3/00
CPC分类号： G01R33/3854 , G01R33/3415 , G01R33/5611
摘要： A magnetic resonance imaging method comprises application of a pulse sequence which includes one or more pulses. The pulse sequence having an intrinsic scan time based on a full sampling rate in k-space for a predetermined full ‘field-of-view’ and a reference temporal pulse shape of the magnetic gradient pulses. A series of magnetic resonance signals is acquired by means of a receiver antennae system having a spatial sensitivity profile. Undersampled signal acquisition is applied to acquire undersampled magnetic resonance signals at a predetermined reduced sampling rate in k-space, the sampling rate being reduced by a reduction factor relative the full sampling rate. The pulse sequence being is during an actual signal scan time is applied. The actual signal scan time being larger than the intrinsic signal scan time times the reduction factor. The undersampling allows a smaller acquisition rate of the magnetic resonance signals and smaller slew rates and amplitudes of the magnetic gradient pulses and lower peak RF-fields of the refocusing pulses. Hence, lower acoustic noise and lower specific absorption rate are achieved.
摘要翻译： 磁共振成像方法包括施加包括一个或多个脉冲的脉冲序列。 脉冲序列具有基于k空间中的预定全“视场”的全采样率的本征扫描时间和磁梯度脉冲的参考时间脉冲形状。 通过具有空间灵敏度分布的接收机天线系统获得一系列磁共振信号。 应用未采样信号采集以在k空间中以预定的降低的采样率获取欠采样的磁共振信号，采样速率相对于全采样率减小减小因子。 脉冲序列是在实际的信号扫描时间期间。 实际信号扫描时间大于固有信号扫描时间乘以缩小因子。 欠采样允许较小的磁共振信号的采集速率和更小的转换速率和磁梯度脉冲的幅度以及重聚焦脉冲的较低峰值RF场。 因此，实现了较低的声学噪声和较低的比吸收率。
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公开(公告)号：US06653834B2
公开(公告)日：2003-11-25
申请号：US10014861
申请日：2001-11-13
申请人： Gabriele Marianne Beck , Romhild Martijn Hoogeveen , Paul Royston Harvey , Johan Samuel Van Den Brink
发明人： Gabriele Marianne Beck , Romhild Martijn Hoogeveen , Paul Royston Harvey , Johan Samuel Van Den Brink
IPC分类号： G01V300
CPC分类号： G01R33/4833 , G01R33/281 , G01R33/5619
摘要： A magnetic resonance imaging method is provided in which the magnetic resonance signals are acquired by sampling a selected region in the k-space. The selected region in the k-space is chosen in dependence on the object or structure to be imaged. In particular an anisotropic central sector in the k-space is chosen, its axis being dependent on the spatial orientation of the object or structure to be imaged. The magnetic resonance imaging method in accordance with the invention is particularly suitable for imaging arteries separately from veins in magnetic resonance angiography.
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25.发明授权Magnetic resonance system with cooling system and monitoring of helium pressure 有权具有冷却系统和监测氦气压力的磁共振系统公开(公告)号：US08593145B2
公开(公告)日：2013-11-26
申请号：US12746780
申请日：2008-12-08
IPC分类号： G01V3/00
CPC分类号： G01R33/3815 , G01R33/3804 , G01R33/3854 , G01R33/389 , G01R33/546 , G01R33/56509 , G01R33/56563 , G01R33/58 , H01F6/04
摘要： A magnetic resonance examination system includes a main magnet with superconducting coils to generate a main magnetic field and a gradient system to apply a gradient magnetic field superposed on the main magnetic field. A cooling system cools the superconducting coils to below their critical superconductivity temperature. A transfer monitor assesses the transfer of energy from the gradient system to the cooling system. The transfer monitor is configured to measure pressure changes in the cooling system. This leads to a simple manner of evaluating the transfer of energy from the gradient coils into the cooling system.
摘要翻译： 磁共振检查系统包括具有用于产生主磁场的超导线圈的主磁体和用于施加叠加在主磁场上的梯度磁场的梯度系统。 冷却系统将超导线圈冷却至低于其临界超导温度。 转移监测器评估从梯度系统到冷却系统的能量转移。 传送监控器被配置为测量冷却系统中的压力变化。 这导致了一种简单的方法来评估从梯度线圈到冷却系统的能量传递。
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公开(公告)号：US08483461B2
公开(公告)日：2013-07-09
申请号：US13119876
申请日：2009-09-21
申请人： Paul Royston Harvey
发明人： Paul Royston Harvey
IPC分类号： G06K9/00
摘要： A diagnostic imaging system including a plurality of scanning apparatuses. Each scanning apparatus including scanning hardware, a data acquisition system connected to the scanning hardware for generating raw image data representative of an object disposed in an imaging region of the scanning apparatus, and a reconstruction unit processing the raw image data for reconstructing an image representation therefrom. Subsets of the raw image data generated by the data acquisition system of one of the scanning apparatuses are distributed via a communication link among the scanning apparatuses for parallel processing by the reconstruction units of the respective scanning apparatuses.
摘要翻译： 一种诊断成像系统，包括多个扫描装置。 每个扫描装置包括扫描硬件，连接到扫描硬件的数据采集系统，用于产生代表设置在扫描装置的成像区域中的对象的原始图像数据;以及重构单元，处理用于重建图像表示的原始图像数据 。 其中一个扫描装置的数据采集系统生成的原始图像数据的子集通过各扫描装置的重构单元在用于并行处理的扫描装置之间的通信链路分配。
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公开(公告)号：US20120306493A1
公开(公告)日：2012-12-06
申请号：US13522367
申请日：2011-01-13
申请人： Tobias Ratko Voigt , Ulrich Katscher , Thomas Hendrik Rozijn , Paul Royston Harvey , Hanno Homann , Christian Findeklee , Eberhard Sebastian Hansis
发明人： Tobias Ratko Voigt , Ulrich Katscher , Thomas Hendrik Rozijn , Paul Royston Harvey , Hanno Homann , Christian Findeklee , Eberhard Sebastian Hansis
IPC分类号： G01R33/54 , G01R33/341
CPC分类号： G01R33/48 , A61B5/0536 , A61B5/055 , G01R33/246 , G01R33/443
摘要： The invention relates to a magnetic resonance method of electric properties tomography imaging of an object, the method comprising: applying an excitation RF field to the object via a coil at a first spatial coil position (402), acquiring resulting magnetic resonance signals via a receiving channel from the object, determining from the acquired magnetic resonance signals a first phase distribution and a first amplitude of a given magnetic field component of the excitation RF field of the coil at the first coil position (402), repeating these steps with a coil at a second different spatial coil position (404), to obtain a second phase distribution, determining a phase difference between the first and second phase distribution, determining a first and a second complex permittivity of the object, the first complex permittivity comprising the first amplitude of the given magnetic field component and the second complex permittivity comprising the second amplitude of the given magnetic field component and the phase difference, equating the first complex permittivity and the second complex permittivity for receiving a final equation and determining from the final equation a phase of the given magnetic field component for the first coil position (402).
摘要翻译： 本发明涉及一种物体的电性能断层摄影成像的磁共振方法，该方法包括：经由第一空间线圈位置（402）的线圈将激发RF场施加到物体，经由接收器获得产生的磁共振信号 从所述对象中确定所述线圈在所述第一线圈位置（402）处的所述磁共振信号的第一相位分布和所述线圈的激励RF场的给定磁场分量的第一幅度，并将线圈重复这些步骤 第二不同的空间线圈位置（404），以获得第二相位分布，确定所述第一和第二相位分布之间的相位差，确定所述对象的第一和第二复介电常数，所述第一复介电常数包括所述第一和第二相位分布的第一幅度 给定的磁场分量和包括给定磁场的第二振幅的第二复数介电常数 分量和相位差，将第一复数介电常数和第二复数介电常数相等以接收最终方程，并从最终方程确定用于第一线圈位置（402）的给定磁场分量的相位。
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公开(公告)号：US08072211B2
公开(公告)日：2011-12-06
申请号：US12439246
申请日：2007-08-29
申请人： Paul Royston Harvey
发明人： Paul Royston Harvey
IPC分类号： G01V3/00
CPC分类号： G01R33/3415 , G01R33/3664 , G01R33/4838 , G01R33/5659
摘要： A magnetic resonance (MR) system comprising multiple radio-frequency (RP) coils (303) configured to apply an MR pulse sequence (100) including at least a preparation segment (PRP) and an acquisition segment (ACQ), wherein the preparation segment (PRP) and the acquisition segment (ACQ) each comprise one or more excitation pulses, is disclosed herein. The MR system further comprises a first control unit (308) configured to apply the one or more excitation pulses of the preparation segment (PRP) by activating the multiple radio-frequency coils in a first excitation pattern, and a second control unit configured to apply the one or more excitation pulses of the acquisition segment (ACQ) by activating the multiple radio-frequency coils in a second excitation pattern, thereby providing dynamic rf shimming.
摘要翻译： 一种包括多个射频（RP）线圈（303）的磁共振（MR）系统，其被配置为施加至少包括准备段（PRP）和采集段（ACQ）的MR脉冲序列（100），其中所述准备段 （PRP）和采集段（ACQ）各自包括一个或多个激励脉冲。 MR系统还包括：第一控制单元（308），被配置为通过以第一激励模式激活多个射频线圈来施加准备段（PRP）的一个或多个激励脉冲;以及第二控制单元，被配置为应用 通过以第二激励图案激活多个射频线圈，从而提供动态rf匀场，以获得段（ACQ）的一个或多个激励脉冲。
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29.发明申请MAGNETIC RESONANCE SYSTEM WITH COOLING SYSTEM AND MONITORING OF HELIUM PRESSURE 有权具有冷却系统和氦压力监测的磁共振系统公开(公告)号：US20100253334A1
公开(公告)日：2010-10-07
申请号：US12746780
申请日：2008-12-08
IPC分类号： G01R33/44
CPC分类号： G01R33/3815 , G01R33/3804 , G01R33/3854 , G01R33/389 , G01R33/546 , G01R33/56509 , G01R33/56563 , G01R33/58 , H01F6/04
摘要： A magnetic resonance examination system comprises a main magnet with superconducting coils to generate a main magnetic field and a gradient system to apply a gradient magnetic field superposed on the main magnetic field. A cooling system cools the superconducting coils to below their critical superconductivity temperature. A transfer monitor assesses the transfer of energy from the gradient system to the cooling system. The transfer monitor being configured to measure pressure changes in the cooling system. This leads to a simple manner to evaluate the transfer of energy from the gradient coils into the cooling system.
摘要翻译： 磁共振检查系统包括具有超导线圈的主磁体以产生主磁场，以及梯度系统以施加叠加在主磁场上的梯度磁场。 冷却系统将超导线圈冷却至低于其临界超导温度。 转移监测器评估从梯度系统到冷却系统的能量转移。 传送监视器被配置成测量冷却系统中的压力变化。 这导致了一种简单的方法来评估从梯度线圈到冷却系统的能量传递。
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公开(公告)号：US20090192383A1
公开(公告)日：2009-07-30
申请号：US12438246
申请日：2007-08-17
CPC分类号： A61N1/403 , A61B5/015 , A61B5/055 , G01R33/4804
摘要： This invention relates to a device for retrieving information about one or more states of a mammalian body comprising: (a) a magnetic resonance imaging device comprising a first set of one or more radio-frequency coils for measuring the body temperature Ti at a selected location of a mammalian body, (b) a local heating means including a second set of one or more radio-frequency coils, said second set comprising at least two channels for delivering focused radio frequency energy to said selected location of said mammalian body and raising the temperature Ti thereof, and (c) means for modulating said radio-frequency energy delivered by said second set of coils as a function of said temperature Ti in order to reach and maintain a predefined temperature Tp above the normal mammalian body temperature Tb.
摘要翻译： 本发明涉及一种用于检索关于哺乳动物身体的一个或多个状态的信息的装置，包括：（a）磁共振成像装置，其包括用于测量所选位置处的体温Ti的一个或多个射频线圈的第一组 （b）包括第二组一个或多个射频线圈的局部加热装置，所述第二组包括至少两个通道，用于将聚焦的射频能量传送到所述哺乳动物身体的所述选定位置，并提高 温度Ti，以及（c）用于调节作为所述温度Ti的函数的由所述第二组线圈输送的所述射频能量的装置，以达到并保持高于正常哺乳动物体温Tb的预定温度T p。
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