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22 条记录 (耗时 0.02 秒)

    Power regulator with overcurrent protection
    1.
    发明授权
    Power regulator with overcurrent protection 失效
    功率调节器，具有过流保护功能

    公开(公告)号：US4855858A

    公开(公告)日：1989-08-08

    申请号：US142304

    申请日：1987-12-29

    申请人： Martin Boertzel ,  Reinhold Ludwig ,  Wilhelm Schmits ,  Ulrich Weiss

    发明人： Martin Boertzel ,  Reinhold Ludwig ,  Wilhelm Schmits ,  Ulrich Weiss

    IPC分类号： H02M3/28 ,  H02M3/337

    CPC分类号： H02M3/3378

    摘要： A regulator includes a switching transformer (TR) whose primary winding is divided into two halves through which current flows alternatingly via one respective switching transistor (Q1, Q2). The pulses on the secondary side of the transformer are rectified to attain the output voltage. The output voltage is controlled by pulse width modulated driver pulses for the two switching transistors. A protective circuit (12) with immediate effect terminates the currently applied driver pulse when the current flowing through the conductive switching transistor reaches a critical current value. A protective circuit (14) with delay effect prevents the generation of further driver pulses upon a further increased overload, this prevention being limited with respect to time. The protective system directly is controlled by the primary current of the power regulator.

    摘要翻译： 调节器包括开关变压器（TR），其初级绕组被分成两半，电流通过该两个电路经由一个相应的开关晶体管（Q1，Q2）交替流动。 变压器次级侧的脉冲被整流以达到输出电压。 输出电压由两个开关晶体管的脉宽调制驱动器脉冲控制。 当流过导电开关晶体管的电流达到临界电流值时，具有即时效应的保护电路（12）终止当前施加的驱动脉冲。 具有延迟效果的保护电路（14）防止在进一步增加的过载时产生进一步的驱动器脉冲，这种防止在时间上受到限制。 保护系统直接由电源调节器的初级电流控制。

    Microstrip coil design for MRI apparatus
    5.
    发明授权
    Microstrip coil design for MRI apparatus 失效
    MRI仪器的微带线圈设计

    公开(公告)号：US07202668B2

    公开(公告)日：2007-04-10

    申请号：US11357715

    申请日：2006-02-17

    申请人： Reinhold Ludwig ,  Mathew Brevard ,  Gene Bogdanov

    发明人： Reinhold Ludwig ,  Mathew Brevard ,  Gene Bogdanov

    IPC分类号： G01V3/00 ,  H01P7/04 ,  H01P7/06

    CPC分类号： G01R33/34046 ,  G01R33/34007

    摘要： A microstrip-based RF coil for use in an MRI apparatus constructed to perform human head imaging is provided and includes (a) a cylindrical non-magnetic core module having an outer surface and a longitudinal axis, a cylindrical bore extending through the core module along the longitudinal axis and defining an inner surface; and a plurality of conductive strip lines. The strip lines extend parallel to the longitudinal axis on the outer surface of the core module. The coil is constructed such that one or more of the conductive strips are divided into conductive microstrip segments with one or more tuning capacitors being bridged between two adjacent microstrip segmented sections of the conductive strip. The coil also include a shield support cylinder that is disposed concentrically about the core module and is spaced therefrom to receive the tuning capacitors. The shield support cylinder supports a conductive segmented shield that is operatively connected to the conductive strips through tunable capacitors at a front and rear of the shield support cylinder.

    摘要翻译： 提供了一种用于执行人头成像的MRI设备中使用的基于微带的RF线圈，其包括（a）具有外表面和纵向轴线的圆柱形非磁性核心模块，沿核心模块延伸穿过的圆柱形孔 纵轴并限定内表面; 和多条导电带状线。 带状线在芯模块的外表面上平行于纵向轴线延伸。 线圈被构造成使得一个或多个导电条被分成导电微带段，其中一个或多个调谐电容器被桥接在导电带的两个相邻微带分段部分之间。 线圈还包括屏蔽支撑圆筒，其围绕芯模块同心地设置并与之隔开以接收调谐电容器。 屏蔽支撑圆筒支撑导电分段屏蔽，该屏蔽通过在屏蔽支撑筒的前部和后部的可调电容器可操作地连接到导电条。

    Dual-tuned microstrip resonator volume coil
    6.
    发明申请
    Dual-tuned microstrip resonator volume coil 失效
    双调谐微带谐振器体积线圈

    公开(公告)号：US20060250125A1

    公开(公告)日：2006-11-09

    申请号：US11403205

    申请日：2006-04-11

    申请人： Gene Bogdanov ,  Reinhold Ludwig ,  Craig Ferris

    发明人： Gene Bogdanov ,  Reinhold Ludwig ,  Craig Ferris

    IPC分类号： G01R33/10

    CPC分类号： G01R33/34046 ,  G01R33/345 ,  G01R33/3453 ,  G01R33/3635 ,  G01R33/3678

    摘要： A dual-tuned volume coil for performing MR imaging according to one embodiment includes an inner cylinder having a first coil structure disposed on an inner surface thereof and a second coil structure disposed on an outer surface thereof. The first coil structure operates at a first resonance frequency and the second coil structure operates at a second resonance frequency. The volume coil includes an outer shield disposed about the inner cylinder, with the first and second coil structure being connected to the outer shield by means of a plurality of capacitors.

    摘要翻译： 根据一个实施例的用于执行MR成像的双调谐体积线圈包括：内筒，其具有设置在其内表面上的第一线圈结构和设置在其外表面上的第二线圈结构。 第一线圈结构以第一谐振频率工作，第二线圈结构以第二谐振频率工作。 体积线圈包括围绕内筒设置的外屏蔽，其中第一和第二线圈结构通过多个电容器连接到外屏蔽。

    Method and apparatus for performing neuroimaging
    9.
    发明授权
    Method and apparatus for performing neuroimaging 失效
    用于执行神经成像的方法和装置

    公开(公告)号：US07343194B2

    公开(公告)日：2008-03-11

    申请号：US10409625

    申请日：2003-04-08

    申请人： Craig F. Ferris ,  Arthur C. Allard ,  Reinhold Ludwig ,  Gene Bogdanov

    发明人： Craig F. Ferris ,  Arthur C. Allard ,  Reinhold Ludwig ,  Gene Bogdanov

    IPC分类号： A61B5/05

    CPC分类号： A61B5/0555

    摘要： In one aspect, a restraining assembly for an awake animal within a magnetic resonance imaging (MRI) device is provided and includes a body restrainer having a first part and a second part that hold a body of the awake animal therebetween. The assembly is of a dual coil design in that it has a volume coil for generating an excitation RF signal and an RF surface coil for receiving an RF response from the animal. The assembly further includes components that serve to restrain movements of the animal, thereby eliminating motion artifacts during the MRI procedure. For example, the assembly preferably includes an adjustable hip holder that has a first section that seats against and applies a restraining force to a buttocks/hip area of the animal and a second section that is adjustably coupled to a pivoting member that is attached to the first section of the body restrainer such that the hip holder is adjustable in both a longitudinal direction along a length of the body restrainer and an up/down direction within the body restrainer between the first and second parts thereof. The pivoting member having features that permit the hip holder to be locked in a desired location so that a sufficient restraining force is applied the animal.

    摘要翻译： 一方面，提供了一种用于在磁共振成像（MRI）装置内的清醒动物的约束组件，并且包括具有第一部分和第二部分的身体限制器，该第一部分和第二部分将醒来动物的身体保持在其间。 组件是双线圈设计，其具有用于产生激励RF信号的体积线圈和用于从动物接收RF响应的RF表面线圈。 组件还包括用于抑制动物运动的组件，从而消除MRI过程期间的运动伪影。 例如，组件优选地包括可调节的髋部保持器，其具有抵靠并施加约束力到动物的臀部/臀部区域的第一部分，以及可调节地联接到枢转构件的第二部分， 身体限制器的第一部分，使得臀部保持器沿着身体限制器的长度在纵向方向上可调节，并且在身体限制器之间的上/下方向之间可调节其第一和第二部分之间。 枢转构件具有允许臀部保持器锁定在期望位置的特征，使得动物施加足够的约束力。

    Systems for detecting measuring inclusions
    10.
    发明授权
    Systems for detecting measuring inclusions 失效
    检测夹杂物的系统

    公开(公告)号：US06590200B1

    公开(公告)日：2003-07-08

    申请号：US09285528

    申请日：1999-04-02

    申请人： Reinhold Ludwig ,  Diran Apelian ,  Sergey Makarov

    发明人： Reinhold Ludwig ,  Diran Apelian ,  Sergey Makarov

    IPC分类号： H01J4014

    CPC分类号： G01N15/12 ,  G01N33/206 ,  G01N2015/1037 ,  G01N2015/1062 ,  G01N2015/1272

    摘要： The present invention relates to systems of methods of detecting and measuring inclusions in liquid metals. More particularly, non-metallic inclusions having a conductivity level different from the liquid metal melt are forced to migrate and are collected on a measurement surface using electromagnetic Lorentz forces. The inclusions and their concentrations are detected at the measurement surface using either an electrostatic detection system or an optical detection system.

    摘要翻译： 本发明涉及检测和测量液态金属中的夹杂物的方法系统。 更具体地说，导电性与液态金属熔体不同的非金属夹杂物被迫迁移，并使用电磁洛伦兹力将其收集在测量表面上。 使用静电检测系统或光学检测系统在测量表面检测夹杂物及其浓度。