公开(公告)号：US20070170918A1

公开(公告)日：2007-07-26

申请号：US10595474

申请日：2004-10-22

申请人： Marinus Vrinten ,  Cornelis Ham ,  Robert Kleihorst ,  Gerardus Mulder ,  Paulus Cornelius Haans

发明人： Marinus Vrinten ,  Cornelis Ham ,  Robert Kleihorst ,  Gerardus Mulder ,  Paulus Cornelius Haans

IPC分类号： G01V3/00

CPC分类号： G01R33/28 ,  G01R33/3806 ,  G01R33/422

摘要： The invention relates to a treatment room (7) suitable for recording images of a human or animal body on the basis of a magnetic resonance (MR) imaging technique, the walls (7a), the ceiling (7b) and the floor (7c) of the treatment room forming an electromagnetic shield for a magnetic resonance (MR) imaging system (1) arranged in the treatment room, which MR imaging system comprises at least a target area (5) in which a human or animal body can be placed, a housing (2, 3, 4) comprising at least one main magnetic unit and at least one gradient magnetic unit for generating one or more magnetic fields in the target area (5), and at least one radio-frequency (RF) pulse unit (6) for generating an electromagnetic RF pulse in the target area (5). The invention further relates to a magnetic resonance imaging system comprising a target area in which a human or animal body can be placed, a housing comprising at least one main magnetic unit and at least one gradient magnetic unit for generating one or more magnetic fields in the target area, and at least one radio-frequency (RF) pulse unit for generating an electromagnetic RF pulse in the target area. In accordance with the invention, means (10, 11, 12, 13, 14, 15, 16, 17) are present which, in operation, counteract the electromagnetic effects (8) of the RF pulse in the treatment room (7) outside the target area (5).

摘要翻译： 本发明涉及一种适用于基于磁共振（MR）成像技术，壁（7a），天花板（7b）和地板（MR）成像技术记录人体或动物体的图像的治疗室（7） 形成用于设置在治疗室中的磁共振（MR）成像系统（1）的电磁屏蔽的处理室，其中该MR成像系统至少包括目标区域（5），人体或动物体可以在其中 放置，包括至少一个主磁单元和用于在目标区域（5）中产生一个或多个磁场）和至少一个射频（RF）的至少一个梯度磁单元的壳体（2,3,4） ）脉冲单元（6），用于在目标区域（5）中产生电磁RF脉冲。 本发明还涉及一种磁共振成像系统，其包括其中可以放置人或动物体的目标区域，包括至少一个主磁单元和至少一个梯度磁单元的壳体，用于在该区域中产生一个或多个磁场 目标区域和用于在目标区域中产生电磁RF脉冲的至少一个射频（RF）脉冲单元。 根据本发明，存在装置（10,11,12,13,14,15,16,17），其在操作中抵消外部处理室（7）中的RF脉冲的电磁效应（8） 目标区域（5）。

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：US20070085542A1

公开(公告)日：2007-04-19

申请号：US10595580

申请日：2004-10-21

申请人： Cornelis Ham ,  Hans Tut

发明人： Cornelis Ham ,  Hans Tut

IPC分类号： G01V3/00

CPC分类号： G01R33/3854 ,  G01R33/3856

摘要： A magnetic resonance imaging (MRI) system including 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 extending substantially coaxially with both said coil configurations. The tubular body (7) comprises stainless steel rods (10) positioned substantially in axial direction.

摘要翻译： 包括梯度线圈系统的磁共振成像（MRI）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）。 两个线圈构造被连接到位于所述两个线圈构型（1,2,3,4,5,6）之间并与两个所述线圈构型基本上同轴延伸的管状体（7）上。 管状体（7）包括基本上沿轴向定位的不锈钢棒（10）。

公开(公告)号：US20060145699A1

公开(公告)日：2006-07-06

申请号：US10544513

申请日：2004-01-29

申请人： Cornelis Ham ,  Wilhelmus Mens ,  Johannes Groen

发明人： Cornelis Ham ,  Wilhelmus Mens ,  Johannes Groen

IPC分类号： G01V3/00

CPC分类号： G01R33/3854

摘要： The invention relates to a magnetic resonance imaging (MRI) system comprising an examination volume (9), a main magnet system (17) for generating a main magnetic field (Bo) in the examination volume, a gradient magnet system (25) for generating gradients of the main magnetic field, and a control system (37) for compensating disturbances of the magnetic field caused by mechanical vibrations of the MRI system. According to the invention, the control system is a feed-forward control system which determines a necessary compensation for said disturbances in dependence on an electric current in the gradient magnet system according to a predetermined response relation. Since in most MRI systems the mechanical vibrations are predominantly caused by the altering electric currents in the gradient magnet system and by eddy currents induced thereby, the invention provides an accurate and reliable compensation for said disturbances, so that artifacts and other distortions of the reconstructed image caused by said disturbances are considerably reduced.

摘要翻译： 本发明涉及一种磁共振成像（MRI）系统，其包括检查体积（9），用于在检查体积中产生主磁场（B ）的主磁体系统（17）， 梯形磁体系统（25），用于产生主磁场的梯度;以及控制系统（37），用于补偿由MRI系统的机械振动引起的磁场的扰动。 根据本发明，控制系统是前馈控制系统，其根据预定的响应关系，根据梯度磁铁系统中的电流来确定对所述干扰的必要补偿。 由于在大多数MRI系统中，机械振动主要是由梯度磁体系统中的改变电流和由此引起的涡流引起的，本发明为所述扰动提供了精确和可靠的补偿，从而使得重构图像的伪像和其它失真 所造成的干扰大大减少。

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：US20070063705A1

公开(公告)日：2007-03-22

申请号：US10595579

申请日：2004-10-18

申请人： Cornelis Ham

发明人： Cornelis Ham

IPC分类号： G01V3/00

CPC分类号： G01R33/385 ,  G01R33/3856

摘要： The present invention relates to a gradient coil system for magnetic resonance imaging (MRI) systems and to a magnetic resonance imaging (MRI) system comprising such a gradient coil system. Magnetic resonance imaging systems comprise at least a main magnet system, a gradient coil system, a RF system and a signal processing system. The gradient coil system according to the present invention comprises at least two X primary coil-like elements (X1pc, X2PC), at least two Y primary coil-like elements (Y1pc, Y2pc) and one Z primary coil-like element (ZPC) providing a modular gradient coil system, wherein the at least two X primary coil-like elements (X1PC, X2PC) have mutually different linearity volumes by themselves or in combination with each other, the at least two Y primary coil-like elements (Y1PC, Y2PC) have mutually different linearity volumes by themselves or in combination with each other, and the one Z primary coil-like element (ZPC) is placed between the X primary coil-like elements (X1PC, X2PC) and the Y primary coil-like elements (Y1PC, Y2PC).

摘要翻译： 本发明涉及用于磁共振成像（MRI）系统的梯度线圈系统和包括这种梯度线圈系统的磁共振成像（MRI）系统。 磁共振成像系统至少包括主磁体系统，梯度线圈系统，RF系统和信号处理系统。 根据本发明的梯度线圈系统包括至少两个X初级线圈状元件（X 1 PC 2，X 2 PC），至少两个Y初级线圈状元件， （Y 1 PC 2，Y 2 PC）和一个Z初级线圈状元件（Z PC PC），提供模块化梯度线圈系统 ，其中所述至少两个X初级线圈状元件（X 1 PC 1，X 2 PC PC）本身或彼此组合具有相互不同的线性体积， 至少两个Y初级线圈状元件（Y 1 PC PC 2，Y 2 PC PC）本身或彼此组合具有相互不同的线性体积，并且一个Z 初级线圈状元件（Z PC PC）放置在X初级线圈状元件（X 1 PC 1，X 2 PC PC）和 Y初级线圈状元件（Y 1 PC 1，Y 2 PC PC）。

公开(公告)号：US20060261811A1

公开(公告)日：2006-11-23

申请号：US10537451

申请日：2003-11-04

申请人： Cornelis Ham ,  Miha Fuderer

发明人： Cornelis Ham ,  Miha Fuderer

IPC分类号： G01V3/00

CPC分类号： G01R33/5659 ,  G01R33/246 ,  G01R33/3415 ,  G01R33/5612

摘要： The invention relates to an MRI system (1) for nuclear magnetic resonance imaging which comprises a plurality of transmit coils (11, 12). Each coil receives a coil drive signal (SD1, SD2). The respective coil drive signals have the same shape, but may have a different amplitude and phase, controlled by a controller (103) on the basis of characteristic information in a memory (104) as well as user input information. The controller is designed to set the respective amplitudes and phases in such a way that the resultant overall B1 field is as homogeneous as possible in a volume of interest.