This invention discloses a chargingdischarging protective circuit for a secondary battery pack, having an over-chargingdischarging voltage comparator, a reference voltage source and a battery status decision circuit. The images are acquired while the patient is in an initial position, and the images are registered to a treatment coordinate system. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The host system receives the associations from the remote systems, stores them, and consults the associations to identify recipients that need to be notified in connection with a lot number that needs to be tracked.