A device, system, and method for predicting or determining lesion efficacy and method for displaying lesion efficacy data to a user. The device may include a treatment assembly including a plurality of electrodes and a location tracking element, such as a gyroscope or accelerometer. The location tracking element may determine an angular velocity and/or linear acceleration of the treatment assembly as the treatment assembly is rotated and moved, and the velocity data may be used to determine an angle of rotation, which may be used to determine the location of each of the plurality of electrodes relative to an area of tissue. As the tissue is ablated with the plurality of electrodes, a lesion prediction plot may be displayed to the user. The lesion prediction plot may include one or more graphical representations indicating a total number of effective contact seconds between each electrode and the tissue.
