Eliminating the geometric error in tissue conductivity measurements by increasing the sample size

In this study we simulated the tissue conductivity measurement with two-electrode probe in contact with the samples of different size. We found that after the sample reaches about twice the size of the probe, further increase in the size of the sample does not affect the resulting conductance. For smaller sizes of the sample we found that conductance decreases significantly. This decrease in conductance causes the underestimation of the conductivity of the sample. This error is caused by the limited geometry of the sample hence the geometric error. The geometric error can be avoided by ensuring the size of the sample is sufficiently larger than the probe, either by having large enough samples or by decreasing the size the probe.