Separation of spectral components
    21.
    发明授权
    Separation of spectral components 失效
    光谱成分的分离

    公开(公告)号:US4902973A

    公开(公告)日:1990-02-20

    申请号:US172213

    申请日:1988-03-23

    申请人: Hanan Keren

    发明人: Hanan Keren

    IPC分类号: G01R33/485 G01R33/54

    CPC分类号: G01R33/4828 G01R33/485

    摘要: Separation of spectral components is achieved by acquiring radio frequency (RF) signals using a two dimensional scan sequence wherein the bandwidth of at least one of the RF pulses is less than or equal to the Larmor frequency difference of the spectral components. The slice select gradient pulse applied during the application of the RF pulse of limited frequency is smaller than the slice select gradient pulses applied during application of the other Rf pulses.

    摘要翻译: 通过使用二维扫描序列获取射频(RF)信号来实现频谱分量的分离,其中至少一个RF脉冲的带宽小于或等于频谱分量的拉莫尔频率差。 在施加有限频率的RF脉冲期间施加的切片选择梯度脉冲小于在施加其它Rf脉冲期间施加的切片选择梯度脉冲。

    Spatial separation of spectral components
    22.
    发明授权
    Spatial separation of spectral components 失效
    光谱成分的空间分离

    公开(公告)号:US4847559A

    公开(公告)日:1989-07-11

    申请号:US154041

    申请日:1988-02-09

    申请人: Hanan Keren

    发明人: Hanan Keren

    CPC分类号: G01R33/4828 G01R33/485

    摘要: Spatial separation of first and second spectral components in magnetic resonance imaging systems is accomplished by causing the first and second spectral components to generate first and second signals of different frequencies which are spatially separated and converting the spatially separated signals to image data for first and second images of said first and second spectral components respectively.

    摘要翻译: 磁共振成像系统中第一和第二光谱分量的空间分离是通过使第一和第二光谱分量产生空间分离的不同频率的第一和第二信号并将空间分离的信号转换成用于第一和第二图像的图像数据来实现的 的所述第一和第二光谱分量。

    Quadrature combiner
    23.
    发明授权
    Quadrature combiner 失效
    正交组合器

    公开(公告)号:US4833429A

    公开(公告)日:1989-05-23

    申请号:US194974

    申请日:1988-05-17

    IPC分类号: G01R33/341

    CPC分类号: G01R33/3678

    摘要: A quadrature coil combiner for phase shifting the pulses and signals of a quadrature coil system used in magnetic resonance (MR) systems to selectively combine or cancel the pulses and signals transmitted and received. The combiner comprises a first and a second conductor for coupling a first and a second coil respectively of the quadrature coil system to a transmit-receive circuit of the MR system. The first conductor comprises an insertable .pi./2 radian delay. The second conductor includes a fixed .pi./2 radian delay. At least one of either the fixed delay or the insertable delay is a quarter wavelength cable whereby active elements are minimized.

    摘要翻译: 一种正交线圈组合器,用于对在磁共振(MR)系统中使用的正交线圈系统的脉冲和信号进行相移,以选择性地组合或取消发射和接收的脉冲和信号。 组合器包括用于将正交线圈系统的第一和第二线圈耦合到MR系统的发射 - 接收电路的第一和第二导体。 第一导体包括可插入的π/ 2弧度延迟。 第二导体包括固定的pi / 2弧度延迟。 固定延迟或可插入延迟中的至少一个是四分之一波长的电缆,由此有源元件被最小化。

    Slice orientation selection arrangement
    24.
    发明授权
    Slice orientation selection arrangement 失效
    切片方向选择安排

    公开(公告)号:US4710716A

    公开(公告)日:1987-12-01

    申请号:US778503

    申请日:1985-09-20

    IPC分类号: G01R33/54 G01R33/20

    CPC分类号: G01R33/4833

    摘要: A slice orientation selection arrangement for magnetic resonance imaging in planes oblique to the normal cartesian coordinates. The coordinates are rotated to applying gradient signals using Euler computations.

    摘要翻译: 用于在垂直于正常笛卡尔坐标的平面中的磁共振成像的切片取向选择装置。 使用欧拉计算旋转坐标以应用梯度信号。

    Multi-band feed assembly for linear and circular polarization
    25.
    发明授权
    Multi-band feed assembly for linear and circular polarization 有权
    用于线性和圆偏振的多波段馈线组件

    公开(公告)号:US08994473B2

    公开(公告)日:2015-03-31

    申请号:US13338286

    申请日:2011-12-28

    摘要: A waveguide has distal, medial and proximal sections. The distal and medial sections rotate relative to each other and to the proximal section. In a first configuration, the waveguide transforms linearly polarized electromagnetic radiation at the proximal end of the proximal section to linearly polarized electromagnetic radiation at the distal end of the distal section and vice versa. In a second configuration, the waveguide transforms linearly polarized radiation at the proximal end of the proximal section into circularly polarized electromagnetic radiation at the distal end of the distal section and vice versa. Preferably, the distal and medial sections include respective eight-wavelength polarizers and the proximal section includes a quarter-wavelength polarizer. A multi-band antenna feed includes two such waveguides, one nested inside the other, for transforming electromagnetic radiation of respective frequency bands.

    摘要翻译: 波导具有远端,内侧和近端部分。 远侧和中间部分相对于彼此和近端部分旋转。 在第一构造中,波导将近端部分的近端处的线偏振电磁辐射转换成在远端部分的远端处的线偏振电磁辐射,反之亦然。 在第二配置中,波导将近端部分的近端处的线性偏振辐射转换成远端部分的远端处的圆极化电磁辐射,反之亦然。 优选地,远侧和中间部分包括相应的八波长偏振器,并且近侧部分包括四分之一波长的偏振器。 多频带天线馈电包括两个这样的波导,一个嵌套在另一个中,用于转换各个频带的电磁辐射。

    System, method and apparatus for measuring blood flow and blood volume
    26.
    发明授权
    System, method and apparatus for measuring blood flow and blood volume 有权
    用于测量血流量和血量的系统,方法和装置

    公开(公告)号:US08414498B2

    公开(公告)日:2013-04-09

    申请号:US10556483

    申请日:2004-05-10

    IPC分类号: A61B5/02 A61B5/05

    摘要: A system for measuring blood flow in an organ of a subject, particularly useful for non-invasive cardiac output monitoring (N.I.C.O.M.™), the system comprises: a radiofrequency generator for generating output radiofrequency signals; a plurality of electrodes, designed to be connectable to the skin of the subject, the electrodes being for transmitting the output radiofrequency signals to the organ and for sensing input radiofrequency signals of the organ. The system further comprises a mixer, electrically communicating with the radiofrequency generator and at least a portion of the plurality of electrodes, for mixing the output radiofrequency signals and the input radiofrequency signals, so as to provide a mixed radiofrequency signal being indicative of the blood flow. The system further comprises electronic circuitry, constructed and designed to filter out a portion of the mixed radiofrequency signal so as to substantially increase a signal-to-noise ratio of a remaining portion of the mixed radiofrequency signal.

    摘要翻译: 一种用于测量受试者器官中的血流的系统,特别用于非侵入式心输出量监测(N.I.C.O.M.TM),所述系统包括:射频发生器,用于产生输出射频信号; 多个电极,被设计为可连接到被检体的皮肤,所述电极用于将输出的射频信号传送到器官,并用于感测器官的输入射频信号。 该系统还包括混频器,与射频发生器和多个电极的至少一部分电连通,用于混合输出射频信号和输入射频信号,以便提供指示血流的混合射频信号 。 该系统还包括电子电路,其被构造和设计为滤除混合射频信号的一部分,以便基本上增加混合射频信号的剩余部分的信噪比。

    Method and apparatus for assessing vascular conditions
    27.
    发明申请
    Method and apparatus for assessing vascular conditions 审中-公开
    评估血管病变的方法和装置

    公开(公告)号:US20080009756A1

    公开(公告)日:2008-01-10

    申请号:US11822645

    申请日:2007-07-09

    申请人: Hanan Keren

    发明人: Hanan Keren

    摘要: A method suitable for assessing the vascular condition of a subject is disclosed. The method comprises: measuring the transit time TT1 of a blood wavefront from the subject's heart to a distal point in a limb of the subject, and measuring the transit time TT2 of a blood wavefront from an intermediate point in the limb of the subject to the distal point of the subject's limb. The method further comprises computing the ratio TT2/TT1 and determining the likelihood that a small vessel disease condition exists when the ratio TT2/TT1 is above a preselected threshold.

    摘要翻译: 公开了一种适用于评估受试者的血管状况的方法。 该方法包括:测量从对象的心脏到受试者的肢体中的远端点的血液波前的传播时间TT 1,并且测量传播时间TT 2 < 从对象肢体的中间点到受试者肢体的远端点的血液波前。 该方法还包括计算比例TT 2 / TT 1,并确定当比例TT 2 / TT 1时存在小血管疾病状况的可能性, TT <1> 高于预选阈值。

    Method and apparatus for monitoring the cardiovascular condition, particularly the degree of arteriosclerosis in individuals
    28.
    发明授权
    Method and apparatus for monitoring the cardiovascular condition, particularly the degree of arteriosclerosis in individuals 有权
    用于监测心血管病症,特别是个体动脉硬化程度的方法和装置

    公开(公告)号:US06676608B1

    公开(公告)日:2004-01-13

    申请号:US09577001

    申请日:2000-05-23

    申请人: Hanan Keren

    发明人: Hanan Keren

    IPC分类号: A61B502

    摘要: A method and apparatus for monitoring the presence of arteriosclerosis in an individual includes detecting an ECG signal of the individual's heart, detecting a blood front wave in a peripheral artery of the individual, and measuring the time lag between a predetermined reference point of the detected blood front wave and a predetermined reference point in the ECG signal to provide an indication of the cardiovascular condition of the individual, particularly arteriosclerosis or arterial obstruction.

    摘要翻译: 用于监测个体动脉硬化的存在的方法和装置包括检测个人心脏的ECG信号,检测个体的外周动脉中的血前波,并测量检测到的血液的预定参考点之间的时间差 前波和ECG信号中的预定参考点,以提供个体的心血管状况的指示,特别是动脉硬化或动脉阻塞。

    Radiation delivery devices and methods of making same
    29.
    发明授权
    Radiation delivery devices and methods of making same 失效
    辐射输送装置及其制作方法

    公开(公告)号:US06283911B1

    公开(公告)日:2001-09-04

    申请号:US09391054

    申请日:1999-09-16

    申请人: Hanan Keren

    发明人: Hanan Keren

    IPC分类号: A61N500

    摘要: A device for delivering radiation to at least one preselected site in a vascular system of a patient, includes an elongated flexible catheter tube of a diameter for insertion into the patient's vascular system, and a flexible guide wire within the catheter tube and movable along its length. The guide wire includes a proximal end to be located externally of the patient's vascular system for moving the guide wire within the catheter tube, and a rounded distal tip at the opposite end to facilitate movement of the guide wire through the catheter tube. At least one radiation-producing element is fixed to the guide wire at an intermediate location spaced from the rounded distal tip.

    摘要翻译: 用于将辐射递送到患者血管系统中的至少一个预选部位的装置包括用于插入患者血管系统中的直径的细长柔性导管,以及导管内的柔性引导线,并可沿其长度移动 。 引导线包括位于患者血管系统外部的近端,用于移动导管内的导丝,以及在相对端的圆形远端尖端,以便于导丝通过导管的移动。 至少一个辐射产生元件在与圆形远端尖端间隔开的中间位置处固定到导丝。

    Slice orientation selection arrangement
    30.
    再颁专利
    Slice orientation selection arrangement 有权
    切片方向选择安排

    公开(公告)号:USRE37325E1

    公开(公告)日:2001-08-14

    申请号:US09234439

    申请日:1999-01-21

    IPC分类号: G01V300

    CPC分类号: G01R33/4833

    摘要: A slice orientation selection arrangement for magnetic resonance imaging in planes oblique to the normal cartesian coordinates. The coordinates are rotated to applying gradient signals using Euler computations.

    摘要翻译: 用于在垂直于正常笛卡尔坐标的平面中的磁共振成像的切片取向选择装置。 使用欧拉计算旋转坐标以应用梯度信号。