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    • 51. 发明申请
    • Ferromagnetic foreign body detection using magnetics
    • 铁磁异物检测使用磁性
    • US20010012915A1
    • 2001-08-09
    • US09741774
    • 2000-12-15
    • William F. AvrinPeter V. CzipottR. Kemp MassengillSankaran Kumar
    • A61B005/05
    • A61B5/055A61B5/04005A61B5/05A61B5/416A61B5/4244G01R33/16G01V3/08
    • A probe instrument using room-temperature sensor(s) that can measure magnetic susceptibilities variations. The instrument includes room temperature magnetic sensors, and detects the sample, that is the tissue response to an applied field coil. The sensors that can be used include magnetoresistive, fluxgate and magnetoinductive sensors. The applied field coil dimensions are chosen so that the applied field is optimized for maximum response from the item of interest while minimizing the effects due to the overlying tissue and at the same time not unduly increasing the sensitivity of the instrument to adjacent organs. To minimize noise introduced in the sensor due to fluctuations in the applied field, the applied field is canceled at the position of the sensor. To overcome variations in the sensor output due to fluctuations in the applied field, change in the ambient temperature and mechanical relaxation of the instrument, the detector assembly is oscillated while the examined patient remains stationary.
    • 使用可测量磁化率变化的室温传感器的探头仪器。 该仪器包括室温磁传感器,并检测样品,即对施加的场线圈的组织响应。 可以使用的传感器包括磁阻,磁通门和磁感应传感器。 选择施加的磁场线圈尺寸,使得所施加的磁场被优化用于来自感兴趣项目的最大响应,同时使由于上覆组织引起的影响最小化,并且同时不会不适当地增加仪器对相邻器官的灵敏度。 为了最小化由于施加场的波动引起的传感器噪声,施加的场在传感器的位置被取消。 为了克服由于施加场的波动导致的传感器输出的变化,环境温度的变化和仪器的机械松弛,检测器组件在被检查的患者保持静止时振荡。