1. A Transcranial Magnetic Stimulation (TMS) method for stimulating a brain region deep within a patient's brain, the method comprising: positioning a first TMS electromagnet outside of a patient's head; determining the distance between a target deep brain region and a sulcus, wherein the sulcus is within the range of a magnetic field emitted by the first TMS electromagnet; determining stimulation parameters for the first TMS electromagnet based on the distance between the target brain region and the sulcus; and applying energy to the first TMS electromagnet at the determined stimulation parameters.