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    MR method and arrangement for carrying out the method
    1.
    发明授权
    MR method and arrangement for carrying out the method 失效
    实施该方法的MR方法和装置

    公开(公告)号：US5938599A

    公开(公告)日：1999-08-17

    申请号：US754360

    申请日：1996-11-22

    申请人： Volker Rasche ,  Peter Bornert ,  Kai-Michael Ludeke ,  Michael Kuhn

    发明人： Volker Rasche ,  Peter Bornert ,  Kai-Michael Ludeke ,  Michael Kuhn

    IPC分类号： A61B5/055 ,  G01R33/28 ,  G01R33/561 ,  G01V3/14

    CPC分类号： G01R33/285 ,  G01V3/14 ,  G01R33/56308

    摘要： The position of an object, for example a catheter, in a body to be examined is determined so as to enable monitoring of its movement through the body at the same time that information concerning the anatomy in the surroundings of the object is to be acquired. An as high as possible temporal and spatial resolution should be achieved for this purpose. To this end, the nuclear magnetization in the surrounding region of the object is determined by means of a micro-coil which is mounted on the inserted object, it being possible to determine the position of the object from the nuclear magnetization. Subsequently, an RF coil system is used to perform a line scan around this position in order to determine the nuclear magnetization in a line-shaped region.

    摘要翻译： 确定物体（例如导管）在被检体内的位置，以便能够同时监视其在物体周围的解剖结构信息的同时通过身体的运动。 为此目的应该达到尽可能高的时间和空间分辨率。 为此，通过安装在插入对象上的微型线圈来确定物体的周围区域的核磁化，可以从核磁化确定物体的位置。 随后，RF线圈系统用于围绕该位置执行线扫描，以便确定线状区域中的核磁化。

    Method of suppressing current distribution noise in a DC SQUID
    2.
    发明授权
    Method of suppressing current distribution noise in a DC SQUID 失效
    抑制DC SQUID中电流分布噪声的方法

    公开(公告)号：US5095270A

    公开(公告)日：1992-03-10

    申请号：US565825

    申请日：1990-08-10

    申请人： Kai-Michael Ludeke

    发明人： Kai-Michael Ludeke

    IPC分类号： G01R33/035 ,  H01L39/22

    CPC分类号： G01R33/0354 ,  Y10S505/846

    摘要： A method of suppressing current distribution noise in a DC SQUID comprising two Josephson junctions (12) in a superconducting current. This current distribution noise is caused by individual fluctuations of the critical currents of the two Josephson junctions used for measuring weak magnetic fields. A DC SQUID is connected to a device which comprises a control device (14) for generating a periodic bias current (I.sub.b), a modulation device (15) for generating a flux modulation via an induced AC current in the loop (11), and a signal detection device (17) for forming a mean output voltage (V.sub.ges). The polarity of the bias current (I.sub.B) is reversed by the control device (14) with the modulation frequency and a time shift of one quarter of the period duration of the modulation frequency, so that the SQUID assumes different bias states. In the case of suitably weighted signal detection in the signal detection device (17), the current distribution noise signals stemming from fluctuations of the critical currents eliminate one another in the signal sum taken over four bias states.

    摘要翻译： 一种在超导电流中抑制包括两个约瑟夫逊结（12）的DC SQUID中的电流分布噪声的方法。 这种电流分布噪声是由用于测量弱磁场的两个约瑟夫逊结的临界电流的单独波动引起的。 DC SQUID连接到包括用于产生周期性偏置电流（Ib）的控制装置（14）的装置，用于通过环路（11）中的感应AC电流产生磁通量调制的调制装置（15），以及 用于形成平均输出电压（Vges）的信号检测装置（17）。 偏置电流（IB）的极性由调制频率和调制频率的周期持续时间的四分之一的时间偏移量的控制装置（14）反转，使得SQUID呈现不同的偏置状态。 在信号检测装置（17）中适当加权的信号检测的情况下，源自临界电流的波动的电流分布噪声信号在四个偏置状态下消除的信号中相互消除。

    Image synthesizing method for forming a composite image from basic images
    3.
    发明授权
    Image synthesizing method for forming a composite image from basic images 失效
    用于从基本图像形成合成图像的图像合成方法

    公开(公告)号：US5864234A

    公开(公告)日：1999-01-26

    申请号：US844913

    申请日：1997-04-22

    申请人： Kai-Michael Ludeke

    发明人： Kai-Michael Ludeke

    IPC分类号： A61B5/055 ,  G01R33/32 ,  G01R33/3415 ,  G06T1/00 ,  G01V3/00

    CPC分类号： G01R33/3415 ,  G01R33/246

    摘要： An image synthesizing method and apparatus for forming a composite image from basic images with complex image values acquired by sensors having sensitivities which vary differently across the area to be imaged, includes the deviation of complex image values of the composite image from the image values of the basic images which have been weighted in dependence on the complex values of the sensitivity of the sensors. The complex sensitivity values are determined according to the invention in that the sensitivities of the sensors are estimated on the basis of the basic images themselves by determining the sensitivity of each sensor from the basic image acquired thereby.

    摘要翻译： 一种图像合成方法和装置，用于从具有在要成像的区域上变化不同的灵敏度的传感器获得的具有复杂图像值的基本图像形成合成图像，包括合成图像的复合图像值与图像值的偏差 已经根据传感器的灵敏度的复数值加权的基本图像。 根据本发明确定复数灵敏度值，因为通过从由此获取的基本图像确定每个传感器的灵敏度，基于基本图像本身来估计传感器的灵敏度。