公开(公告)号：US5298863A

公开(公告)日：1994-03-29

申请号：US621040

申请日：1990-12-03

申请人： Stefan Nowak ,  Franz Schmitt ,  Hubertus Fischer

发明人： Stefan Nowak ,  Franz Schmitt ,  Hubertus Fischer

IPC分类号： G01R33/385 ,  G01R33/20

CPC分类号： G01R33/3852

摘要： A gradient coil for generating a periodically changing read-out gradient in a magnetic resonance imaging apparatus is operated in a series resonant circuit having a capacitor. One of the elements of the series resonant circuit is charged before the beginning of each read-out gradient. The gradient coil can be charged with current, or the capacitor can be charged with voltage. Such operation either avoids or significantly shortens the transient effect which occurs after excitation of the nuclear spins. The use of a series resonant circuit instead of a parallel resonant circuit significantly reduces the voltage load on the gradient amplifier, so that the gradient amplifier can be constructed simpler and more inexpensively.

摘要翻译： 在具有电容器的串联谐振电路中操作用于在磁共振成像装置中产生周期性变化的读出梯度的梯度线圈。 在每个读出梯度的开始之前，串联谐振电路的元件之一被充电。 梯度线圈可以充电电流，或者电容器可以充电电压。 这种操作可以避免或显着缩短在核自旋激发后发生的瞬态效应。 使用串联谐振电路代替并联谐振电路可以显着降低梯度放大器的电压负载，从而使梯度放大器的构造更简单，成本更低。

公开(公告)号：US5617030A

公开(公告)日：1997-04-01

申请号：US621622

申请日：1996-03-26

申请人： Hubertus Fischer ,  Stefan Nowak ,  Franz Schmitt

发明人： Hubertus Fischer ,  Stefan Nowak ,  Franz Schmitt

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

CPC分类号： G01R33/3852

摘要： A gradient coil is connected to a controllable gradient amplifier via a first diagonal of a bridge circuit having four switches and unbiased diodes respectively connected parallel thereto. A capacitor that forms a resonant circuit together with the gradient coil is connected into the second bridge diagonal of the bridge circuit. A sinusoidal current is supplied through the gradient coil. Due to intentionally incomplete discharging of the capacitor at every other half-wave, an offset current can be superimposed on the sinusoidal current through the gradient coil.

摘要翻译： 梯形线圈经由具有四个分别与其并联连接的开关和无偏置二极管的桥接电路的第一对角线连接到可控梯度放大器。 与梯度线圈一起形成谐振电路的电容器被连接到桥式电路的第二桥对角线中。 通过梯形线圈提供正弦电流。 由于电容器在每隔一个半波有意不完全放电，偏移电流可以叠加在通过梯度线圈的正弦电流上。

公开(公告)号：US5701076A

公开(公告)日：1997-12-23

申请号：US617568

申请日：1996-03-19

申请人： Franz Schmitt ,  Stefan Nowak

发明人： Franz Schmitt ,  Stefan Nowak

IPC分类号： G01R33/28 ,  A61B5/055 ,  G01R33/385 ,  G01R33/36

CPC分类号： G01R33/3852

摘要： The current supply of a gradient coil in a magnetic resonance tomography apparatus with a gradient amplifier and a connectable capacitor that can be interconnected with the gradient coil to form a series resonant circuit. The gradient amplifier produces at least a part of the voltage needed for driving a predetermined gradient current through the gradient coil. The resonant frequency of the capacitor in combination with the gradient coil is lower than 1/4 T.sub.r, whereby T.sub.r is the duration of a leading or trailing edge of the gradient current.

摘要翻译： 在具有梯度放大器和可连接电容器的磁共振断层摄影装置中电流供应梯度线圈，其可与梯度线圈互连以形成串联谐振电路。 梯度放大器产生驱动通过梯度线圈的预定梯度电流所需的电压的至少一部分。 电容器与梯度线圈的共振频率低于+ E，fra 1/4 + EE Tr，其中Tr是梯度电流的前沿或后沿的持续时间。

公开(公告)号：US5245287A

公开(公告)日：1993-09-14

申请号：US924976

申请日：1992-08-05

申请人： Stefan Nowak ,  Franz Schmitt

发明人： Stefan Nowak ,  Franz Schmitt

IPC分类号： G01R33/385

CPC分类号： G01R33/385

摘要： A nuclear magnetic resonance tomography apparatus has at least one gradient coil interconnected with a capacitor to form a resonant circuit. Before the beginning of each read-out sequence, the capacitor is charged to a higher voltage than would be necessary to produce a pure sine oscillation during the read-out sequence. The rise time of the gradient pulse thus produced is less than one-fourth of the duration of the sinusoidal oscillation before the zero-axis crossing, and the decay time is less than one-fourth of the duration of the sinusoidal oscillation after the zero-axis crossing. Additionally, a constant part of each gradient pulse is non-resonantly generated by a gradient amplifier. Only the steep parts of the oscillation of the resonant circuit are used for the rising and trailing edges, whereas the flattened part of the sine oscillation is cut off. The rising and trailing edges can thus be noticeably shortened, so that a greater range for the constant gradient value, which can be equidistantly sampled in the k-space is available for the signal evaluation.

摘要翻译： 核磁共振断层摄影装置具有与电容器互连以形成谐振电路的至少一个梯度线圈。 在每个读出序列开始之前，电容器被充电到比在读出序列期间产生纯正弦振荡所必需的电压更高的电压。 由此产生的梯度脉冲的上升时间小于零轴交叉之前的正弦振荡的持续时间的四分之一，并且衰减时间小于零点后的正弦振荡的持续时间的四分之一， 轴交叉。 此外，每个梯度脉冲的恒定部分由梯度放大器非谐振地产生。 谐振电路的振荡的陡峭部分用于上升沿和后沿，而正弦振荡的扁平部分被切断。 因此，上升沿和后沿可以明显缩短，使得可以在k空间中等距采样的恒定梯度值的更大范围用于信号评估。

公开(公告)号：US06977430B2

公开(公告)日：2005-12-20

申请号：US10895715

申请日：2004-07-21

申请人： Stefan Nowak

发明人： Stefan Nowak

IPC分类号： H01L25/07 ,  H01L25/18 ,  H01L23/52 ,  H01L23/34 ,  H01L23/48

CPC分类号： H01L25/18 ,  H01L2224/48091 ,  H01L2224/4846 ,  H01L2224/48472 ,  H01L2224/49111 ,  H01L2924/30107 ,  H01L2924/00014 ,  H01L2924/00012 ,  H01L2924/00

摘要： A transistor module formed on a substrate comprises a first transistor, a first recovery diode, a second transistor and a second recovery diode. A first transistor chip associated with the first transistor and a second diode chip associated with the second recovery diode are disposed adjacently on a positive potential area. The first transistor chip and the second diode chip are disposed on an output potential area. A second transistor chip associated with the second transistor and a first diode chip associated with the first recovery diode are adjacently disposed on the output potential area. At least two sides of the output potential area are adjacent to a negative potential area. Both the second transistor chip and the first diode chip are connected to the negative potential area, and one of the first and second transistor chips is disposed opposite one of the first and second diode chips located on a different potential area.

公开(公告)号：US09581666B2

公开(公告)日：2017-02-28

申请号：US14090107

申请日：2013-11-26

申请人： Stefan Nowak

发明人： Stefan Nowak

IPC分类号： G01R33/381 ,  G01R33/385 ,  G01R33/44 ,  H01F7/20 ,  A61B5/055

CPC分类号： G01R33/381 ,  A61B5/055 ,  G01R33/385 ,  G01R33/445 ,  H01F7/202

摘要： An arrangement to generate a basic magnetic field and a gradient magnetic field in a magnetic resonance tomography system include at least one basic electromagnet without an iron core that generates the basic magnetic field, at least three gradient field electromagnets that generate the gradient magnetic field, with the basic field electromagnet situated within the gradient field electromagnets such that during acquisition of magnetic resonance data from a subject, the basic field electromagnet is closer to the subject than the gradient field electromagnets. Because the basic electromagnet is situated within the gradient field electromagnets, an active shielding of the gradient field electromagnets can be foregone, and since the basic field electromagnet is situated near the subject, it can be a water-cooled air coil.

摘要翻译： 在磁共振断层摄影系统中产生基本磁场和梯度磁场的装置包括至少一个不产生基本磁场的铁芯的基本电磁体，产生梯度磁场的至少三个梯度场电磁体， 位于梯度场电磁体内的基本场电磁体使得在从对象获取磁共振数据期间，基本场电磁体比梯度场电磁体更接近物体。 由于基本电磁铁位于梯度场电磁体内，因此梯度场电磁体的有源屏蔽可以被放弃，由于基本场电磁体位于被摄体附近，因此可以是水冷空气线圈。

公开(公告)号：US06933825B2

公开(公告)日：2005-08-23

申请号：US10255979

申请日：2002-09-26

申请人： Stefan Nowak

发明人： Stefan Nowak

IPC分类号： G01R33/385 ,  H01F5/00

CPC分类号： G01R33/385

摘要： A gradient coil for use in magnetic resonance tomography is assembled from electrically conductive elements that each define a plane and that are arranged such that these planes lie parallel to one another. These elements are connected in a coil-forming fashion to electrically conductive spacers and in a stabilizing fashion to electrically insulating spacers.

摘要翻译： 用于磁共振断层摄影的梯度线圈由各自限定平面并且被布置成使得这些平面彼此平行的导电元件组装。 这些元件以线圈形成的方式连接到导电间隔件并且以稳定的方式连接到电绝缘间隔件。

公开(公告)号：US20070134992A1

公开(公告)日：2007-06-14

申请号：US10588241

申请日：2004-12-29

申请人： Siegfried Hofler ,  Stefan Nowak ,  Wieland Portisch

发明人： Siegfried Hofler ,  Stefan Nowak ,  Wieland Portisch

IPC分类号： H01R9/22

CPC分类号： H01R12/58 ,  H01R12/7088

摘要： A connection system that couples a contact of a flat block of components to an apparatus is provided. The connection system comprises a conductive connecting element electrically coupled to the contact of the flat block of components, and a clamping device electrically coupled to the apparatus. The clamping device receives the connecting element. The connecting element is a rigid conductor. The rigid conductor is a screw fastened conductively to the contact. The screw penetrates a bore in the flat block of components and is locked by a nut on a second side of the flat block of components, which is opposite a first side of the flat block of components.

摘要翻译： 提供了将平板组件的触点连接到装置的连接系统。 连接系统包括电耦合到部件的扁平块的触点的导电连接元件和电耦合到该装置的夹紧装置。 夹紧装置接收连接元件。 连接元件是刚性导体。 刚性导体是导电地接触触点的螺钉。 螺钉穿过平坦部件中的孔，并且通过与扁平部件的第一侧相对的部件的平坦块的第二侧上的螺母锁定。

公开(公告)号：US20070008676A1

公开(公告)日：2007-01-11

申请号：US11352453

申请日：2006-02-10

申请人： Hubertus Goesmann ,  Hartmut Michel ,  Stefan Nowak ,  Michael Setz ,  Annemarie Setz ,  Bernd Staib

发明人： Hubertus Goesmann ,  Hartmut Michel ,  Stefan Nowak ,  Michael Setz ,  Annemarie Setz ,  Bernd Staib

IPC分类号： H01G4/38

CPC分类号： H01G4/38

摘要： A capacitor module includes a first capacitor and a second capacitor, the first capacitor and the second capacitor each including a first electric terminal and a second electric terminal, a conductor to connect corresponding first electric terminals of the first capacitor and the second capacitor, and a connector to connect the conductor to corresponding second electric terminals of the first capacitor and the second capacitor.

摘要翻译： 电容器模块包括第一电容器和第二电容器，第一电容器和第二电容器各自包括第一电端子和第二电端子，用于连接第一电容器和第二电容器的对应的第一电端子的导体，以及 连接器，用于将导体连接到第一电容器和第二电容器的对应的第二电端子。

公开(公告)号：US20050023673A1

公开(公告)日：2005-02-03

申请号：US10895715

申请日：2004-07-21

申请人： Stefan Nowak

发明人： Stefan Nowak

IPC分类号： H01L25/07 ,  H01L25/18 ,  H01L29/00

CPC分类号： H01L25/18 ,  H01L2224/48091 ,  H01L2224/4846 ,  H01L2224/48472 ,  H01L2224/49111 ,  H01L2924/30107 ,  H01L2924/00014 ,  H01L2924/00012 ,  H01L2924/00

摘要： A transistor module formed on a substrate comprises a first transistor, a first recovery diode, a second transistor and a second recovery diode. A first transistor chip associated with the first transistor and a second diode chip associated with the second recovery diode are disposed adjacently on a positive potential area. The first transistor chip and the second diode chip are disposed on an output potential area. A second transistor chip associated with the second transistor and a first diode chip associated with the first recovery diode are adjacently disposed on the output potential area. At least two sides of the output potential area are adjacent to a negative potential area. Both the second transistor chip and the first diode chip are connected to the negative potential area, and one of the first and second transistor chips is disposed opposite one of the first and second diode chips located on a different potential area.

摘要翻译： 形成在衬底上的晶体管模块包括第一晶体管，第一恢复二极管，第二晶体管和第二恢复二极管。 与第一晶体管相关联的第一晶体管芯片和与第二恢复二极管相关联的第二二极管芯片相邻设置在正电位区域上。 第一晶体管芯片和第二二极管芯片设置在输出电位区域上。 与第二晶体管相关联的第二晶体管芯片和与第一恢复二极管相关联的第一二极管芯片相邻地布置在输出电位区域上。 输出电位区域的至少两侧与负电位区域相邻。 第二晶体管芯片和第一二极管芯片都连接到负电位区域，并且第一和第二晶体管芯片中的一个与位于不同电位区域上的第一和第二二极管芯片中的一个相对置。