A non-transitory computer readable medium stores instructions that, when executed by at least one processor, cause the at least one processor to perform a method that includes computing a transfer matrix representing a relative influence that each respective electrode location for measuring electrical potentials on a patient's body has on an estimation of electrical potentials for locations on a surface of interest prior to the measuring of electrical potentials at the respective electrode locations and receiving electrical potential measurements measured via a plurality of electrodes at respective electrode locations on the patient's body. The method also includes computing the estimation of electrical potentials for the locations on the surface of interest based at least in part on the received electrical potential measurements and the computed transfer matrix and generating image data representing the estimation of electrical potentials.
