1. A system for estimating a target ablation zone for a medical treatment device that applies electrical treatment energy through a plurality of electrodes defining a target treatment area, the system comprising: a memory; a display device; a processor coupled to the memory and the display device; and a treatment planning module stored in the memory and executable by the processor, the treatment planning module adapted to: receive a baseline electrical flow characteristic (EFC) in response to delivery of a test signal to tissue of a subject to be treated; determine, based on the baseline EFC, a second EFC representing an expected EFC during delivery of the electrical treatment energy to the target treatment area; estimate the target ablation zone for display in the display device based on the second EFC.