Abstract
With a model based on Poisson’s equation, computations employing published data and measurements made in glass cylinders filled with saline, the influence of conductivity and geometry on the determination of volume was analysed with an impedancimetric catheter. Two distal electrodes inject a constant current while a set of central electrodes sense by sections the potential along the cylindrical chamber. It was concluded that each section ought to be independently calibrated, the distribution of the electrodes along the catheter and its relationship to the chamber radius being of paramount importance for a linear calibration. The ratio σr, of the external medium conductivity σe to the internal conductivity σi influences drastically both the linearity and the calibration of each section. If a section volume is linearly related to the total chamber volume, that section admittance is a total volume estimator.
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