One aspect relates to limiting treatment to prescribed regions of an individual based at least in part on positioning a treatment limiter mechanism relative to the individual at least partially allowing treating at least some desired or planned location that is desired or planned to be treated, but not allowing treating other locations that are not planned or not desired to be treated from being treated. Another aspect relates to configuring at least a portion of a treatment limiter mechanism at least partially in response to attempting to treat at least a portion of an individual associated with the treatment limiter mechanism.