Using impedance imaging to determine intracavitary probe location

A multielectrode intracavitary probe is investigated as a means of estimating endocardial potentials. A necessary component of this procedure is knowledge of the probe location within the cavity. A method of obtaining the location of the probe using impedance imaging techniques is presented. Current sources and sinks are applied at two to six probe electrodes, thus generating a set of measured probe potentials. A surface integral formulation is then used to obtain a set of calculated probe potentials. This surface integral formulation assumes a knowledge of the probe location, and a comparison of the calculated and measured probe surface potentials indicates the correctness of the assumed probe location. The process is then repeated for another assumed probe location and is continued until the space of the possible probe locations has been spanned