The invention provides devices and methods used to locate target areas within a patient for repeat therapeutic treatments. In the invention, fiduciary markers made of metal or metal alloys are placed within a patient near or at a target site as reference coordinates for particular body locations on the patient. Repeat treatments may then be given to the patient over a period of time based on the coordinates given by the fiduciary markers. The fiduciary markers are specially shaped or put into strand to improve marker attachment and prevent marker migration.