公开(公告)号：US07941210B2

公开(公告)日：2011-05-10

申请号：US11427516

申请日：2006-06-29

申请人： Hans Matthiessen ,  Dieter Weismann ,  Jianhua Li ,  Yvo Gärber ,  Arndt Pöcher ,  Markus Steeger

发明人： Hans Matthiessen ,  Dieter Weismann ,  Jianhua Li ,  Yvo Gärber ,  Arndt Pöcher ,  Markus Steeger

IPC分类号： A61B5/05 ,  G01R27/00 ,  G01R27/08

CPC分类号： A61B5/0536 ,  A61B5/0809 ,  H03F3/45475 ,  H03F3/45928 ,  H03F2200/261 ,  H03F2203/45138

摘要： An electroimpedance tomograph with a plurality of electrodes (1) is provided, which can be placed on the body of a patient and are connected via a selector switch (60) with a control and evaluating unit (20). The control and evaluating unit (20) cooperates with the selector switch (60) such that two electrodes each are supplied with an alternating current from an AC power source (22) and the detected analog voltage signals of the other electrodes are processed in order to reconstruct therefrom the impedance distribution of the body in the plane of the electrodes, wherein a symmetrical AC power source is used to reduce common-mode signals. To further suppress interferences due to common-mode signals, provisions are made for the control and evaluating unit (20) to be set up, furthermore, for detuning the common-mode signal of the alternating current on the body against the ground by means of a common-mode signal measuring electrode (4) and, based on this, the symmetry of the symmetrical AC power source such that the common-mode signal on the body is minimized, and the corresponding detuning parameters are stored for each electrode pair.

摘要翻译： 提供具有多个电极（1）的电阻抗断层摄影机，其可以放置在患者体上，并经由选择器开关（60）与控制和评估单元（20）连接。 控制和评估单元（20）与选择器开关（60）配合使得两个电极各自被提供有来自AC电源（22）的交流电，并且处理其它电极的检测到的模拟电压信号，以便 从而重建在电极的平面中的主体的阻抗分布，其中使用对称的AC电源来减少共模信号。 为了进一步抑制由于共模信号引起的干扰，为控制和评估单元（20）进行设置，此外，为了使身体上的交流电的共模信号与地面相互抵消，借助于 共模信号测量电极（4），并且基于此，对称AC电源的对称性使得主体上的共模信号最小化，并且针对每个电极对存储相应的失谐参数。