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公开(公告)号：US07193416B2
公开(公告)日：2007-03-20
申请号：US10498198
申请日：2002-11-20
申请人： Paul Royston Harvey , Johannes Adrianus Overweg , Cornelis Leonardus Gerardus Ham , Nicolaas Bernardus Roozen , Patrick Willem Paul Limpens
发明人： Paul Royston Harvey , Johannes Adrianus Overweg , Cornelis Leonardus Gerardus Ham , Nicolaas Bernardus Roozen , Patrick Willem Paul Limpens
IPC分类号： G01V3/00
CPC分类号： G01R33/3806 , G01R33/385 , G01R33/3856
摘要： The invention relates to an open magnetic resonance imaging (MRI) magnet system (1) for use in a medical imaging system. The open MRI magnet system has two main coil units which are accomodated, at some distance from each other, in a first housing (2) and in a second housing (3), respectively. Between the two housings, an imaging volume (6) is present wherein a patient to be examined is placed. A gradient coil unit (9, 10) facing the imaging volume is present near a side of each of the two housings. Functional connections of the gradient coil units (9, 10), such as electrical power supply lines (13, 14) and cooling channels (15, 16) are provided in a central passage (4, 5) which is present in each of the two housings. As a result, these functional connections do not reduce the space in the imaging volume available for the patient. The central passages and the electrical power supply lines provided therein are parallel to the direction of the main magnetic field of the open MRI magnet system, so that the Lorentz forces exerted on the power lines are limited.
摘要翻译： 本发明涉及用于医学成像系统的开放磁共振成像（MRI）磁体系统（1）。 开放MRI磁体系统具有分别在第一壳体（2）和第二壳体（3）中彼此相隔一定距离的两个主线圈单元。 在两个壳体之间，存在成像体积（6），其中放置待检查的患者。 面对成像体积的梯度线圈单元（9,10）存在于两个壳体中的每一个的侧面附近。 梯形线圈单元（9,10）的功能连接，例如电力供应线（13,14）和冷却通道（15,16）设置在中央通道（4,5）中，中心通道（4,5）存在于 两个外壳。 因此，这些功能连接不会减少可用于患者的成像体积的空间。 设置在其中的中央通道和电源线平行于开放式MRI磁体系统的主磁场的方向，使得施加在电力线上的洛伦兹力受到限制。
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2.发明授权公开(公告)号：US06998949B2
公开(公告)日：2006-02-14
申请号：US10513625
申请日：2003-04-11
申请人： Nicolaas Bernardus Roozen , Martijn Roger La Grange , Paul Royston Harvey , Patrick Willem Paul Limpens , Cornelis Leonardus Gerardus Ham
发明人： Nicolaas Bernardus Roozen , Martijn Roger La Grange , Paul Royston Harvey , Patrick Willem Paul Limpens , Cornelis Leonardus Gerardus Ham
IPC分类号： H01F7/00
CPC分类号： G01R33/3854
摘要： The invention relates to a magnetic resonance imaging (MRI) system (1) comprising an examination volume (11), a main magnet system (17) for generating a magnetic field (B0) in the examination volume, and a gradient magnet system (25) for generating altering gradients of the magnetic field in the examination volume. The gradient magnet system is accommodated in a housing (31) having a main wall (33) facing the examination volume and a substantially conical wall (35) facing away from the examination volume. The main wall and the conical wall enclose a substantially angular tip portion (47) of the housing. In order to limit the level of the acoustic vibrations in and around the MRI system (1) caused by mechanical vibrations of the angular tip portion (47), the MRI system comprises a plurality of acoustic resonators (55) which each comprise an elongate resonance volume (57) with an open end (59) and a closed end (61) and a length (L) between the open end and the closed end. The open ends of the resonators are arranged near the angular tip portion, and the length of the resonators is substantially equal to 0,25 k*(, wherein k=1, 3, 5, 7, . . . , and wherein (is the wavelength of an acoustic wave caused by mechanical vibrations of the angular tip portion. The resonators have the acoustic property of neutralizing acoustic waves having said wavelength (. Preferably, the length of the resonators is tuned to at least one of the wavelengths corresponding to the mechanical resonance frequencies of the vibrating angular tip portion, as the acoustic waves originating from the vibrations at these resonance frequencies constitute a main portion of the overall acoustic level of the MRI system.
摘要翻译： 本发明涉及一种磁共振成像（MRI）系统（1），包括检查体积（11），用于在检查体积中产生磁场（B 0）的主磁体系统（17）和梯度磁体系统 25）用于在检查体积中产生磁场的改变梯度。 倾斜磁体系统容纳在具有面向检查体积的主壁（33）的壳体（31）中，以及背离检查体积的基本上圆锥形的壁（35）。 主壁和锥形壁围绕壳体的基本角度的尖端部分（47）。 为了限制由角尖端部分（47）的机械振动引起的MRI系统（1）内和周围的声振动的水平，MRI系统包括多个声谐振器（55），每个声谐振器包括细长共振 在开口端和封闭端之间具有开口端（59）和封闭端（61）和长度（L）的容积（57）。 谐振器的开路端设置在角尖端部分附近，谐振器的长度基本上等于0.25 k *（其中k = 1,3,5,7，...，其中（是 谐振器具有具有所述波长的中和声波的声学特性（优选地，将谐振器的长度调谐到对应于波长的波长的至少一个波长 振动角尖端部分的机械共振频率作为源自这些共振频率处的振动的声波构成MRI系统的整体声级的主要部分。
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公开(公告)号：US07053616B2
公开(公告)日：2006-05-30
申请号：US10533991
申请日：2003-10-27
申请人： Nicolaas Bernardus Roozen , Cornelis Leonardus Gerardus Ham , Paul Royston Harvey , Patrick Willem Paul Limpens
发明人： Nicolaas Bernardus Roozen , Cornelis Leonardus Gerardus Ham , Paul Royston Harvey , Patrick Willem Paul Limpens
IPC分类号： G01V3/00
CPC分类号： G01R33/3854
摘要： The invention relates to a magnetic resonance imaging (MRI) system (1) comprising an examination volume (11), a main magnet system (13) for generating a main magnetic field (B0) in the examination volume in a Z-direction, a gradient magnet system (19) for generating gradients of the main magnetic field, and an anti-vibration system (33) for reducing vibrations of the gradient magnet system caused by a mechanical load (MX, MY) exerted on the gradient magnet system as a result of electromagnetic interaction between the main magnetic field and electrical currents in the gradient magnet system. According to the invention the anti-vibration system (33) comprises a balance member (39), which is coupled to the gradient magnet system (19) by means of an actuator system (51) and a coupling device (49) allowing displacements of the balance member relative to the gradient magnet system. The MRI system (1) also has a control system (81) which controls the actuator system in such a manner that the actuator system exerts upon the balance member a compensating mechanical load (MCX, MCY) which substantially corresponds to the mechanical load (MX, MY) exerted on the gradient magnet system. As a result, the actuator system exerts a mechanical reaction load (MRX, MRY) on the gradient magnet system which has the same magnitude as but is oppositely directed to the mechanical load (MX, MY) exerted on the gradient magnet system, so that vibrations of the gradient magnet system are effectively limited.
摘要翻译： 本发明涉及一种磁共振成像（MRI）系统（1），其包括检查体积（11），用于在检查中产生主磁场（B
0）的主磁体系统（13） 在Z方向上的体积，用于产生主磁场梯度的梯度磁体系统（19）和用于减少由机械载荷引起的梯度磁体系统的振动的防振系统（33） 由于梯度磁体系统中的主磁场和电流之间的电磁相互作用，施加在梯度磁体系统上的X，Y，Y）。 根据本发明，防振系统（33）包括平衡构件（39），其通过致动器系统（51）和耦合装置（49）耦合到梯度磁体系统（19），耦合装置（49）允许位移 平衡构件相对于梯度磁体系统。 MRI系统（1）还具有控制系统（81），该控制系统（81）以致动器系统对平衡构件施加补偿机械载荷（M SUB，M -
公开(公告)号：US07224166B2
公开(公告)日：2007-05-29
申请号：US10549057
申请日：2004-03-11
IPC分类号： G01V3/00
CPC分类号： G01R33/3854
摘要： The invention relates to an MRI system (1) comprising an examination volume (11), a main magnet system (13) for generating a main magnetic (field (B0) in the examination volume, a gradient magnet system (19) for generating gradients of the main magnetic field, and an anti-vibration system (39) for reducing vibrations of the gradient magnet system. According to the invention the anti-vibration system comprises a gyroscope (41) which is mounted to the gradient magnet system. As a result of the gyroscopic effect of the gyroscope, the vibrations of the gradient magnet system are effectively reduced. In an open type MRI system (1) according to the invention, a separate gyroscope (41, 43) is mounted to each of the two portions (21, 23) of the gradient magnet system (19), and each gyroscope has an axis of rotation (61) parallel to the main direction (Z) of the main magnetic field (B0).
摘要翻译： 本发明涉及一种MRI系统（1），包括检查体积（11），用于产生主磁场的主磁体系统（13），所述主磁体（检查体积中的磁场（B
0）），梯度 用于产生主磁场梯度的磁体系统（19）和用于减少梯度磁体系统振动的防振系统（39），根据本发明，防振系统包括安装在陀螺仪（41）上的陀螺仪 作为陀螺仪的陀螺效应的结果，梯度磁体系统的振动被有效地减少，在根据本发明的开放式MRI系统（1）中，单独的陀螺仪（41,43） 安装到梯度磁体系统（19）的两个部分（21,23）中的每一个上，并且每个陀螺仪具有平行于主磁场（B -
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：US07026815B2
公开(公告)日：2006-04-11
申请号：US10498441
申请日：2002-12-19
IPC分类号： G01V3/00
CPC分类号： G01R33/3806 , G01R33/3854 , G01R33/3856
摘要： The invention relates to an MR apparatus (1) having an examination volume (6) of the open type such that the examination volume (6) is also accessible laterally, having main coil devices (2) for producing a main magnetic field that are disposed on two opposite sides of the examination volume (6), having at least one high-frequency coil device (5) for exciting the proton precession and having at least one two-part gradient coil device (4), disposed on opposite sides of the examination volume (6), for the positional coding of the excitation of the proton precession. The dynamic Lorentz forces have hitherto resulted in a high oscillation level. It is an object of the invention to provide an MR apparatus (1) that has only a low oscillation level. The invention proposes that, on at least one side of the examination volume (6), a central recess (7) extends from the examination volume (6) and through the main coil device (2), in which recess (7) a holding element (9) is disposed to whose side facing the examination volume (6) the gradient coil device (4) is exclusively attached.
摘要翻译： 本发明涉及具有开放式检查体积（6）的MR装置（1），使得检查容积（6）也可横向接近，具有用于产生设置的主磁场的主线圈装置（2） 在检查体积（6）的相对两侧具有至少一个用于激发质子进动的高频线圈装置（5），并具有至少一个两部分的梯度线圈装置（4） 检查体积（6），用于质子进动的激发的位置编码。 迄今为止，动态的洛伦兹力量导致了高的振荡水平。 本发明的目的是提供一种仅具有低振荡电平的MR装置（1）。 本发明提出，在检查容积（6）的至少一侧，中心凹部（7）从检查体积（6）延伸并穿过主线圈装置（2），凹部（7）中的保持 元件（9）被设置为面向检查体积（6）的一侧，梯度线圈装置（4）是专门附接的。
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公开(公告)号：US11116418B2
公开(公告)日：2021-09-14
申请号：US13884005
申请日：2011-11-02
申请人： Paul Royston Harvey
发明人： Paul Royston Harvey
摘要： A therapeutic apparatus comprising a radiotherapy apparatus for treating a target zone and a magnetic resonance imaging system for acquiring magnetic resonance imaging data. The radiotherapy apparatus comprises a radiotherapy source for directing electromagnetic radiation into the target zone. The radiotherapy apparatus is adapted for rotating the radiotherapy source at least partially around the magnetic resonance magnet. The magnetic resonance imaging system further comprises a radio-frequency transceiver adapted for simultaneously acquiring the magnetic resonance data from at least two transmit-and-receive channels. The therapeutic apparatus further comprises a processor and a memory containing machine executable instructions for the processor. Execution of the instructions causes the processor to: calibrate the transmit-and-receive channels; acquire the magnetic resonance data; reconstruct a magnetic resonance image; register a location of the target zone in the image; and generate radiotherapy control signals using the registered image.
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公开(公告)号：US09638777B2
公开(公告)日：2017-05-02
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
CPC分类号： G01R33/48 , A61B5/0536 , A61B5/055 , G01R33/246 , G01R33/443
摘要： A magnetic resonance method of electric properties tomography imaging of an object includes 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).
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9.发明授权公开(公告)号：US09316710B2
公开(公告)日：2016-04-19
申请号：US13258622
申请日：2010-03-31
IPC分类号： G01R33/44 , G01R33/3415 , G01R33/561 , G01R33/28 , G01R33/54 , G01R33/565
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 pulse capable of causing a specific absorption rate (SAR) hot spot. The composition of the repetitive pulse is varied to generate versions of the repetitive pulse such that the SAR hot spot changes locations with subsequent applications of the repetitive pulse. To generate versions of the 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 pulse is performed to determine the location of SAR hot spot(s). A plurality of versions of the repetitive 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脉冲。 改变重复脉冲的组成以产生重复脉冲的形式，使得SAR热点随后应用重复脉冲而改变位置。 为了产生脉冲的版本，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脉冲。
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10.发明授权Real-time local and global SAR estimation for patient safety and improved scanning performance 有权实时的本地和全球SAR患者安全评估和改进的扫描性能公开(公告)号：US08941380B2
公开(公告)日：2015-01-27
申请号：US12936540
申请日：2009-04-13
申请人： Ingmar Graesslin , Sven Biederer , Ulrich Katscher , Ferdinand Schweser , Peter Boernert , Paul Royston Harvey , Wilhelmus Reinerius Maria Mens
发明人： Ingmar Graesslin , Sven Biederer , Ulrich Katscher , Ferdinand Schweser , Peter Boernert , Paul Royston Harvey , Wilhelmus Reinerius Maria Mens
IPC分类号： G01R33/44 , G01R33/58 , G01R33/561 , G01R33/28 , G01R33/565
CPC分类号： G01R33/583 , G01R33/288 , G01R33/5612 , G01R33/5659
摘要： In a method and apparatus to enable increased RF duty cycle in high field MR scans, a specific energy absorption rate (SAR) calculation processor calculates the local and global SAR or even a spatial SAR map. By incorporating additional information as, e.g. patient position, the SAR calculation accuracy can be increased as well as by using more patient specific pre-calculated information (e.g. based on different bio meshes), the so called Q-matrices. A sequence controller maybe provided to create a global SAR optimal RF pulse. After the optimal RF pulse is applied, the SAR and its spatial distribution are determined. SAR hotspots are also determined. Q-matrices within an appropriate radius around the hotspots are averaged and added to a global Q-matrix in a weighted fashion. After the global Q-matrix is updated, a new optimal RF pulse is created.
摘要翻译： 在能够在高场MR扫描中增加RF占空比的方法和装置中，比能量吸收率（SAR）计算处理器计算局部和全局SAR或甚至空间SAR图。 通过引入附加信息，例如。 患者位置，SAR计算精度以及通过使用更多患者特定的预先计算的信息（例如，基于不同的生物网格），即所谓的Q矩阵。 可以提供序列控制器以创建全局SAR最优RF脉冲。 在施加最佳RF脉冲之后，确定SAR及其空间分布。 SAR热点也是决定的。 在热点周围的适当半径内的Q矩阵被平均，并以加权的方式加到全局Q矩阵上。 在更新全局Q矩阵之后，创建一个新的最优RF脉冲。
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