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    • 4. 发明申请
    • Elecrtoimpedance tomograph
    • 电阻断层扫描
    • US20050059901A1
    • 2005-03-17
    • US10882050
    • 2004-06-30
    • Yvo GarberMarkus SteegerJianhua LiSteffen LeonhardtJan RuterboriesRainer Goldau
    • Yvo GarberMarkus SteegerJianhua LiSteffen LeonhardtJan RuterboriesRainer Goldau
    • A61B5/053G01N27/02A61B5/05
    • A61B5/0536Y10S128/908
    • An electroimpedance tomograph is provided with a plurality of electrodes placed on a body, measuring circuits that process the voltage signals recorded by the electrodes, and a control unit that supplies two, preferably adjacent electrodes each with an alternating current. The control unit has a preset feed frequency performed in different states and different preset feed frequencies performed at different frequencies. The control unit processes the processed voltage signals of all other electrodes to reconstruct the impedance distribution of the body in the electrode plane. To make the EIT more insensitive to electromagnetic interferences, the control unit provides for an automatic setting of the current feed frequency/frequencies to record a background frequency spectrum by detecting the electrode voltage signals over a preset period of time and record them as a voltage time series and transform them into a frequency spectrum. The control unit searches in the background frequency spectrum for a frequency (different states) or frequencies (different frequencies) that leads to a useful signal to background ratio above a preset threshold value when used as a feed frequency.
    • 电阻断层摄影机设置有放置在人体上的多个电极,处理由电极记录的电压信号的测量电路,以及提供两个优选相邻电极各自具有交流电流的控制单元。 控制单元具有在不同状态下执行的预设馈送频率和在不同频率执行的不同预设馈送频率。 控制单元处理所有其他电极的经处理的电压信号,以重建电极平面中的主体的阻抗分布。 为了使EIT对电磁干扰更加不敏感,控制单元通过在预设时间段内检测电极电压信号来自动设置当前馈送频率/频率以记录背景频谱,并将其记录为电压时间 并将其转换为频谱。 当用作馈送频率时,控制单元在背景频谱中搜索频率(不同状态)或频率(不同频率),导致有用信号到背景比高于预设阈值。