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Figure 1

From: Biopsy Needle Integrated with Electrical Impedance Sensing Microelectrode Array towards Real-time Needle Guidance and Tissue Discrimination

Figure 1

Impedance sensor integrated biopsy needle as a solution of tip positioning problem of conventional image-guided biopsy and conventional EIS needle vs. microelectrode array based EIS needle: (a) basic strategy to confirm the position of the biopsy needle tip; (b) potential problems about mis-positioning of the biopsy needle; (c) biopsy needle with electrical impedance sensor (EIS needle) for tumor discrimination and accurate needle positioning; (d) schematic image of conventional EIS needle for 2-electrode measurement; (e) schematic image of microelectrode array based EIS needle for 4-electrode measurement and multi-spot EIS; (f) measurement error induced by electrode polarization effect in conventional EIS with two electrodes and its resolution by using 4-electrode measurement; (g) multi-spot and localized sensing based on microelectrode array.

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