公开(公告)号：US20070176602A1

公开(公告)日：2007-08-02

申请号：US10598670

申请日：2005-03-08

申请人： Nicolaas Roozen ,  Martijn La Grange ,  David Biloen

发明人： Nicolaas Roozen ,  Martijn La Grange ,  David Biloen

IPC分类号： G01V3/00

CPC分类号： G01R33/3854 ,  G01R33/4215

摘要： The present invention relates to a magnetic resonance imaging (MRI) device. The basic components of an MRI device are the main magnet system (2), the gradient system (3), the RF system and the signal processing system. According to the present invention, the magnetic resonance imaging (MRI) device has an eddy current shield system, wherein the eddy current shield system comprises at least one perforated eddy current screen (13, 14), and wherein the or each perforated eddy current screen (13, 14) is assigned to the main magnet system (2).

摘要翻译： 磁共振成像（MRI）装置技术领域本发明涉及磁共振成像（MRI）装置。 MRI设备的基本组成部分是主磁体系统（2），梯度系统（3），射频系统和信号处理系统。 根据本发明，磁共振成像（MRI）装置具有涡流屏蔽系统，其中涡流屏蔽系统包括至少一个穿孔涡流屏（13,14），并且其中所述或每个穿孔涡流屏 （13,14）被分配给主磁体系统（2）。

公开(公告)号：US20050219026A1

公开(公告)日：2005-10-06

申请号：US10513625

申请日：2003-04-11

申请人： Nicholaas Roozen ,  Martijn La Grange ,  Paul Harvey ,  Patrick Limpens ,  Cornelis Ham ,  Nicolaas Roozen ,  Martijn La Grange

发明人： Nicholaas Roozen ,  Martijn La Grange ,  Paul Harvey ,  Patrick Limpens ,  Cornelis Ham ,  Nicolaas Roozen ,  Martijn La Grange

IPC分类号： A61B5/055 ,  G01R33/385 ,  H01F1/00

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）。 谐振器的开放端设置在角尖端附近，谐振器的长度基本上等于0.25k *（其中k = 1,3,5,7等等，其中（是波长 谐振器具有具有所述波长的中和声波的声学特性（优选地，谐振器的长度被调谐到与机械谐振相对应的至少一个波长 作为源自这些共振频率的振动的声波，振动角尖端部分的频率构成MRI系统的整体声级的主要部分。

公开(公告)号：US20060273793A1

公开(公告)日：2006-12-07

申请号：US10557757

申请日：2004-05-17

申请人： Nicolaas Roozen ,  Robert Kleihorst ,  Cornelis Leonardus Ham ,  Martijn La Grange

发明人： Nicolaas Roozen ,  Robert Kleihorst ,  Cornelis Leonardus Ham ,  Martijn 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。

公开(公告)号：US20060006866A1

公开(公告)日：2006-01-12

申请号：US10518982

申请日：2003-06-13

申请人： Nicolaas Roozen ,  David Biloen ,  Johannes Overweg

发明人： Nicolaas Roozen ,  David Biloen ,  Johannes Overweg

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) in which a patient to be examined can be accommodated, a main magnet system (3) for generating a magnetic field having a main field portion (17) in the examination volume with a substantially constant magnetic field strength (B0), and a gradient magnet system (13) for generating gradients of the main field portion. The MRI system further comprises a damping member (25, 27) which is mounted to a part (5) of the MRI system susceptible to vibrations relative to the magnetic field during operation. Said damping member comprises an electrically conductive member (29, 35, 37) which is present in the magnetic field and in which eddy currents are generated as a result of said vibrations. According to the invention, the conductive member (29, 35, 37) is arranged in a secondary portion of the magnetic field at a distance from the main field portion (17), which secondary portion has a magnetic field strength which differs by more than 25% from the magnetic field strength (B0) of the main field portion. In this manner, the distance between the conductive member and the main field portion is sufficiently large to prevent the eddy currents in the conductive member from causing unacceptable distortions of the main field portion, while, on the other hand, the magnetic field strength in said secondary portion is still sufficiently large to provide an adequate damping effect of the damping member (25, 27). The damping member (25, 27) can for example be mounted to a housing (5) of the main magnet system (3). Alternatively, the damping member (139, 141) can be mounted to the gradient magnet system (127). In another embodiment the damping member (27) is mounted to a rigid portion of the MRI system (1), for example to the supporting member (21), which does hardly vibrate during operation. In this embodiment, the damping member (27) is used to damp the vibrations of the magnetic field generating portions (9) of the main magnet system (3).

公开(公告)号：US20050068032A1

公开(公告)日：2005-03-31

申请号：US10498198

申请日：2002-11-20

申请人： Paul Harvey ,  Johannes Overweg ,  Cornelis Leonardus Ham ,  Nicolaas Roozen ,  Patrick Limpens

发明人： Paul Harvey ,  Johannes Overweg ,  Cornelis Leonardus Ham ,  Nicolaas Roozen ,  Patrick Limpens

IPC分类号： G01R33/385 ,  A61B5/055 ,  G01R33/38 ,  G01R33/3815 ,  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。

公开(公告)号：US20050156595A1

公开(公告)日：2005-07-21

申请号：US10513526

申请日：2003-05-07

申请人： Cornellis Leonardus Gerardus Ham ,  Nicolaas Roozen ,  Patrick Limpens

发明人： Cornellis Leonardus Gerardus Ham ,  Nicolaas Roozen ,  Patrick Limpens

IPC分类号： G01R33/28 ,  A61B5/055 ,  G01R33/385 ,  G01V3/00

CPC分类号： G01R33/3854

摘要： The invention relates to a magnetic resonance imaging (MRI) apparatus (1) comprising a main magnetic system (2) for generating a main magnetic field in an examination volume (7) which is enclosed by the main magnetic system (2). The MRI apparatus also comprises a magnetic gradient coil system (3) comprising gradient coils. The gradient coil system (3) is accommodated between the main magnetic system and the examination volume in order to generate gradients of the main magnetic field. The MRI apparatus also comprises a vacuum space (13). According to the invention, the gradient coil system only partly adjoins the vacuum space, that is, by way of its side which faces the examination volume. Thus, the examination volume is effectively shielded from acoustic vibrations caused by the gradient coil system in operation, while, in a specific embodiment, the end sides (22) of the gradient coil system are available for electrical and mechanical connections outside the vacuum space.

摘要翻译： 本发明涉及一种磁共振成像（MRI）装置（1），其包括用于在由主磁体系统（2）包围的检查容积（7）中产生主磁场的主磁系统（2）。 MRI装置还包括包括梯度线圈的磁梯度线圈系统（3）。 梯度线圈系统（3）容纳在主磁系统和检查体积之间，以产生主磁场的梯度。 MRI装置还包括真空空间（13）。 根据本发明，梯度线圈系统仅部分地邻接真空空间，即通过面向检查体积的一侧。 因此，检查体积被有效地屏蔽在操作中由梯度线圈系统引起的声振动，而在具体实施例中，梯度线圈系统的端侧（22）可用于真空空间外的电和机械连接。

公开(公告)号：US20060192556A1

公开(公告)日：2006-08-31

申请号：US10549057

申请日：2004-03-11

申请人： Paul Harvey ,  Nicolaas Roozen ,  Cornelis Ham

发明人： Paul Harvey ,  Nicolaas Roozen ,  Cornelis Ham

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 0 ）。

公开(公告)号：US20050285594A1

公开(公告)日：2005-12-29

申请号：US10533991

申请日：2003-10-27

申请人： Nicolaas Roozen ,  Cornelis Leonardus Ham ,  Paul Harvey ,  Patrick Limpens

发明人： Nicolaas Roozen ,  Cornelis Leonardus Ham ,  Paul Harvey ,  Patrick Limpens

IPC分类号： G01R33/385 ,  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 (111), 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），包括检查体积（111），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：US20070182516A1

公开(公告)日：2007-08-09

申请号：US10598673

申请日：2005-03-11

申请人： Nicolaas Roozen ,  Adrian Toma ,  Georgo Angelis

发明人： Nicolaas Roozen ,  Adrian Toma ,  Georgo Angelis

IPC分类号： H01F3/00

CPC分类号： G01R33/421 ,  G01R33/3854

摘要： The present invention relates to a magnetic resonance imaging (MRI) device. The basic components of an MRI device are the main magnet system, the gradient system, the RF system and the signal processing system. According to the present invention the magnetic resonance imaging device comprises at least one active shielding device (19, 20) assigned to the main magnet system (2), wherein the or each is driven by an electrical current in order to reduce magnetic field penetration inside the main magnet system and to reduce mechanical forces induced in the main magnet

摘要翻译： 磁共振成像（MRI）装置技术领域本发明涉及磁共振成像（MRI）装置。 MRI设备的基本组成部分是主磁体系统，梯度系统，RF系统和信号处理系统。 根据本发明，磁共振成像装置包括分配给主磁体系统（2）的至少一个有源屏蔽装置（19,20），其中，所述至少一个有源屏蔽装置（19,20）被电流驱动，以便减小内部的磁场穿透 主磁体系统，并减少主磁铁感应的机械力