Electrode Probe Modeling for Skin Cancer Detection by using Impedance Method
The transfer impedance measurement by using a tetrapolar probe is widely used for the detection of skin tumor. The probe sensitivity depends on the electrodes geometry of the probe. It is used the impedance method in order to calculate the transfer impedance of both homogeneous tissue and tumor tissue with a high admitivity content. The sensitivity of the transfer impedance was evaluated by changing both diameter and distance of the electrodes of the probe. The numerical method proposed in this work is a modified solution by using interpolation technique to calculate the electrical potential within a volume conductor. The simulations showed that the sensitivity for detecting skin tumor depends on both electrode diameter and electrode separation. The maximum calculated sensitivity was 10% for an electrode diameter of 1 mm and a separation of 2.5 mm. It was verified that the measured signal depends on the probe geometry and then it can be increased by decreasing the electrode spacing or by increasing the electrode diameter. The results are important in order to fabricate a more sensitive impedance probes for the detection of tumors in and also to better characterize biological tissues.
skin cancer impedance method transfer impedance tetrapolar probe sensibility