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1.发明授权公开(公告)号：US09417301B2
公开(公告)日：2016-08-16
申请号：US13816512
申请日：2011-08-19
IPC分类号： G01V3/00 , G01R33/422 , C25D15/00 , G01R33/565
CPC分类号： G01R33/422 , C25D15/00 , G01R33/56518
摘要： The invention relates to a magnetic resonance imaging system (1) comprising: a main magnet (2) for generating a uniform, steady magnetic field within an examination volume, at least one RF antenna (9) for transmitting RF pulses to the examination volume for magnetic resonance spin excitation, a gradient coil unit comprising gradient coils (4, 5, 6) for generating gradient magnetic fields in the examination volume (100), an RF shield (104) disposed between said RF antenna (9) and said gradient coils (4, 5, 6), said RF shield (104) comprising a shielding material adapted for suppressing Eddy currents induced in the shield by said gradient magnetic fields and for screening RF fields towards the gradient coils (4, 5, 6), said RF fields being generated by the RF antenna (9), wherein the RF shield comprises a conductive coating (104, 110) as shielding material.
摘要翻译： 本发明涉及一种磁共振成像系统（1），包括：用于在检查体积内产生均匀的稳定磁场的主磁体（2），用于将RF脉冲发送到检查体积的至少一个RF天线（9），用于 磁共振自旋激励，梯度线圈单元，包括用于在检查体积（100）中产生梯度磁场的梯度线圈（4,5,6）; RF屏蔽（104），设置在所述RF天线（9）和所述梯度线圈 （4,6,6），所述RF屏蔽（104）包括屏蔽材料，所述屏蔽材料适于抑制所述屏蔽体中由所述梯度磁场感应的涡流，并用于屏蔽朝向所述梯度线圈（4,5,6）的RF场，所述屏蔽材料 RF场由RF天线（9）产生，其中RF屏蔽包括作为屏蔽材料的导电涂层（104,110）。
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公开(公告)号：US20090237079A1
公开(公告)日：2009-09-24
申请号：US11721173
申请日：2005-12-14
申请人： Marinus Johannes Adrianus Maria Van Helvoort , Johannes Petrus Groen , Robert Paul Kleihorst , Cornelis Leonardus Gerardus Ham
发明人： Marinus Johannes Adrianus Maria Van Helvoort , Johannes Petrus Groen , Robert Paul Kleihorst , Cornelis Leonardus Gerardus Ham
CPC分类号： G01R33/3692 , G01R33/3415 , G01R33/3621
摘要： The invention relates to a device (1) for magnetic resonance imaging of a body (7), comprising a main magnet (2) for generation of a stationary and substantially homogeneous main magnetic field within the examination zone, a plurality of wireless receiving units (10a, 10b) placed in or near the examination zone, and sampling means (21a, 21b) operating at a variable sampling frequency for sampling the received MR signals and for converting them into digital signal samples. In order to provide an MR device (1), which is arranged to inductively energize the wireless receiving units (10a, 10b) without interference with the nuclear spin system of the examined object (7) and which does not necessarily require bulky energy storage means for the operation of the wireless receiving units (10a, 10b), the invention proposes to make provision for energizing means (17) generating an RF energizing field within the examination zone for inductively supplying electric power to the wireless receiving units (10a, 10b), wherein the frequency of the RF energizing field is an integer multiple of the sampling frequency.
摘要翻译： 本发明涉及一种用于身体（7）的磁共振成像的装置（1），包括用于在检查区内产生静止且基本均匀的主磁场的主磁体（2），多个无线接收单元 10a，10b），以及以可变采样频率工作的采样装置（21a，21b），用于对接收的MR信号进行采样并将其转换成数字信号采样。 为了提供一种MR装置（1），其被布置成在不干扰检查对象（7）的核自旋系统的情况下感应地激励无线接收单元（10a，10b），并且不一定需要庞大的能量存储装置 为了无线接收单元（10a，10b）的操作，本发明提出为激励装置（17）提供在该检查区域内产生用于向无线接收单元（10a，10b）供电的电力的RF激励场， ，其中所述RF激励场的频率是所述采样频率的整数倍。
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公开(公告)号：US20090209842A1
公开(公告)日：2009-08-20
申请号：US12307623
申请日：2007-07-03
申请人： Adrianus Hendrikus Koevoets , Georgo Zorz Angelis , Nicolaas Bernardus Roozen , Gerardus Nerius Peeren , Cornelis Leonardus Gerardus Ham
发明人： Adrianus Hendrikus Koevoets , Georgo Zorz Angelis , Nicolaas Bernardus Roozen , Gerardus Nerius Peeren , Cornelis Leonardus Gerardus Ham
IPC分类号： A61B5/055
CPC分类号： G01R33/3854 , G01R33/4215
摘要： The invention relates to a magnetic resonance imaging system which comprises means for generating a static magnetic field and a gradient coils system for generating a time varying magnetic gradient field by use of a first electrical current and a second electrical current. The gradient coils system is located in the magnetic field and the gradient coils system has a plurality of vibrational modes. Lorentz forces are generated due to the interaction of the first and/or second electrical currents with the superposition of the static magnetic field and the magnetic gradient field. The gradient coils system and/or the first electrical current are adapted so that the integral of the in-products of said Lorentz forces and a vibrational mode of said plurality of vibrational modes is at a value close to zero, wherein said in-products are determined for all points of the gradient coils system, and wherein the integral is determined by summing the in-products determined for all the points. As the above mentioned integral is close to zero or preferably zero, the Lorentz forces are not able to excite the vibrational mode (for example the lowest order bending mode) of the gradient coils system. Thus acoustical noise that is generated by a vibrating gradient coils system is reduced and the comfort for a patient that is examined by the magnetic resonance imaging system is therefore enhanced.
摘要翻译： 本发明涉及一种磁共振成像系统，其包括用于产生静态磁场的装置和用于通过使用第一电流和第二电流产生时变磁梯度场的梯度线圈系统。 梯度线圈系统位于磁场中，梯度线圈系统具有多个振动模式。 由于第一和/或第二电流与静磁场和磁梯度场的叠加相互作用，产生洛伦兹力。 梯度线圈系统和/或第一电流被调整为使得所述洛伦兹力的所述产物和所述多个振动模式的振动模式的积分值接近于零，其中所述产品是 对于梯度线圈系统的所有点确定，并且其中通过对所有点确定的产品求和来确定积分。 由于上述积分值接近零或优选为零，所以洛伦兹力不能激发梯度线圈系统的振动模式（例如最低阶弯曲模式）。 因此，由振动梯度线圈系统产生的声学噪声减小，并且因此增强了由磁共振成像系统检查的患者的舒适度。
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公开(公告)号：US20080262340A1
公开(公告)日：2008-10-23
申请号：US11569069
申请日：2005-05-12
IPC分类号： A61B5/055 , G01R33/563
CPC分类号： G01R33/56375
摘要： The invention relates to a MRI system and to a method for producing an image with such an system. In order to provide a MR imaging technique with a high efficient MR signal acquisition, which provides a high level of comfort to a patient, a MRI system and method are suggested, where image data from an object are acquired while the object is moving with variable speed relative to the MRI system, and where the image data are combined and an image of the object is reconstructed.
摘要翻译： 本发明涉及一种MRI系统和一种用这种系统生产图像的方法。 为了提供具有高效MR信号采集的MR成像技术，其为患者提供高水平的舒适性，建议了MRI系统和方法，其中在物体运动时获取来自对象的图像数据， 相对于MRI系统的速度，并且其中图像数据被组合并且重建对象的图像。
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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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公开(公告)号：US09222997B2
公开(公告)日：2015-12-29
申请号：US13703705
申请日：2011-06-14
IPC分类号： G01V3/00 , G01R33/36 , G01R33/385 , H03F3/217 , H02M7/49
CPC分类号： G01R33/36 , G01R33/3852 , H02M7/49 , H03F3/2178
摘要： A gradient coil power supply includes: at least two H-bridge circuits connected in series, wherein each H-bridge circuit supplies: voltage of a first polarity when in a first switching state, voltage of a second polarity when in a second switching state, no voltage when in a third switching state, and no voltage when in a fourth switching state; and a controller for controlling the switching of the H-bridge circuits. The controller is adapted for: receiving a gradient pulse sequence; creating a switching plan for controlling the switching of the H-bridge circuits, wherein the switching plan includes controlling the voltage output of the gradient coil power supply by alternating between the first switching state and the second switching state, and at least one H-bridge circuit being in either the third or fourth switching state for part of the switching plan to cool the H-bridge circuit; and executing the switching plan.
摘要翻译： 梯度线圈电源包括：串联连接的至少两个H桥电路，其中每个H桥电路在处于第一开关状态时提供：第一极性的电压，当处于第二开关状态时具有第二极性的电压， 在第三开关状态时没有电压，当处于第四开关状态时没有电压; 以及用于控制H桥电路的切换的控制器。 控制器适用于：接收梯度脉冲序列; 创建用于控制H桥电路的切换的切换计划，其中切换计划包括通过在第一切换状态和第二切换状态之间交替来控制梯度线圈电源的电压输出，以及至少一个H桥 电路处于第三或第四开关状态，部分用于冷却H桥电路的开关方案; 并执行切换计划。
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公开(公告)号：US20130088234A1
公开(公告)日：2013-04-11
申请号：US13703705
申请日：2011-06-14
IPC分类号： G01R33/36
CPC分类号： G01R33/36 , G01R33/3852 , H02M7/49 , H03F3/2178
摘要： A gradient coil power supply (100, 812) for a magnetic resonance imaging system (800) comprising: at least two H-bridge circuits (104, 106, 108, 200, 202, 204, 206); wherein the H-bridge circuits are connected in series; wherein each of the H-bridge circuits supplies voltage of a first polarity when in a first switching state (200); wherein the each H-bridge circuit supplies voltage of a second polarity when the H-bridge is in a second switching state (202); wherein each H-bridge circuit supplies no voltage when in a third switching state (204); wherein each H-bridge circuit supplies no voltage when in a fourth switching state (206); and a controller (814) for controlling the switching of the H-bridge circuits, wherein the controller is adapted for: —receiving (600, 700) a gradient pulse sequence (818), —creating (602, 702) a switching plan for controlling the switching of each of the H-bridge circuits, wherein the switching plan comprises controlling the voltage output of the gradient coil power supply by alternating between the first switching state and the second switching state, wherein the switching plan further comprises operating (710) at least one H-bridge circuit selected from the H-bridge circuits in either the third or fourth switching state for part of the switching plan to cool the H-bridge circuit, —executing (604, 704) the switching plan.
摘要翻译： 一种用于磁共振成像系统（800）的梯度线圈电源（100,812），包括：至少两个H桥电路（104,106,108,200,202,204,206）; 其中所述H桥电路串联连接; 其中每个所述H桥电路在处于第一开关状态时提供第一极性的电压; 其中当所述H桥处于第二切换状态时，所述H桥电路提供第二极性的电压; 其中每个H桥电路在第三开关状态（204）中不提供电压; 其中每个H桥电路在第四切换状态（206）中不提供电压; 以及用于控制所述H桥电路的切换的控制器（814），其中所述控制器适于： - 接收（600,700）梯度脉冲序列（818）， - 创建（602,702）用于 控制每个H桥电路的切换，其中切换计划包括通过在第一切换状态和第二切换状态之间交替来控制梯度线圈电源的电压输出，其中切换计划还包括操作（710） 至少一个H桥电路从第三或第四开关状态的H桥电路中选择用于冷却H桥电路的切换计划的一部分，并执行切换计划（604,704）。
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公开(公告)号：US07508207B2
公开(公告)日：2009-03-24
申请号：US10557757
申请日：2004-05-17
申请人： Nicolaas Bernardus Roozen , Robert Paul Kleihorst , Cornelis Leonardus Gerardus Ham , Martijn Roger La Grange
发明人： Nicolaas Bernardus Roozen , Robert Paul Kleihorst , Cornelis Leonardus Gerardus Ham , Martijn Roger La Grange
IPC分类号： G01V3/00
CPC分类号： G01R33/3854
摘要： The invention provides a magnetic resonance imaging (MRI) device (21), comprising a diagnostic space (25), a main magnetic system (22) for generating a main magnetic field in said diagnostic space, a gradient magnetic coil system (23) comprising a gradient coil for generating at least one gradient of the main magnetic field, and noise reducing means (29, 32) for reducing noise that is generated as a result of vibrations of the gradient coil. The noise reducing means comprise a sound-absorbing panel (29) disposed between the gradient coil and the diagnostic space. The sound-absorbing panel (29) comprises channels having an open end and a closed end.
摘要翻译： 本发明提供一种磁共振成像（MRI）装置（21），包括诊断空间（25），用于在所述诊断空间中产生主磁场的主磁系统（22），梯度磁线圈系统（23），包括 用于产生主磁场的至少一个梯度的梯度线圈，以及用于降低由于梯度线圈的振动而产生的噪声的降噪装置（29,32）。 降噪装置包括设置在梯度线圈和诊断空间之间的吸音板（29）。 吸声板（29）包括具有开口端和封闭端的通道。
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公开(公告)号：US07292036B2
公开(公告)日：2007-11-06
申请号：US10595580
申请日：2004-10-21
IPC分类号： G01V3/00
CPC分类号： G01R33/3854 , G01R33/3856
摘要： A magnetic resonance imaging (MRI) system includes a gradient coil system. The gradient coil system comprises an inner coil configuration (1,2,3) and an outer coil configuration (4,5,6) positioned substantially coaxially with said inner coil configuration (1,2,3). Both coil configurations are attached to a tubular body (7) located between said two coil configurations (1,2,3,4,5,6) and extend substantially coaxially with both of the coil configurations. The tubular body (7) comprises stainless steel rods (10) positioned substantially in an axial direction.
摘要翻译： 磁共振成像（MRI）系统包括梯度线圈系统。 梯度线圈系统包括与所述内线圈构型（1,2,3）基本上同轴设置的内线圈构造（1,2,3）和外线圈构型（4,5,6）。 两个线圈构造都连接到位于所述两个线圈构型（1,2,3,4,5,6）之间的管状体（7）上并且与两个线圈构型基本同轴地延伸。 管状体（7）包括基本上沿轴向定位的不锈钢棒（10）。
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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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