The present invention is directed to a prevention and treatment for dermatological disorders. A planned target volume is identified for radiotherapy treatment and at least one volume of interest is identified. The method further includes precisely gating the detector via a gating element and a coincident signal with pulses that coincide with the expected arrival times of the pulses in the detected public channel signal. The unit connector is connected to the body power terminal for supplying a power voltage to the operation portion. The predetermined output may include alerting a user as to the presence of a bubble, flagging potentially corrupted data, and ceasing data collection until the interrogation zone is clear of bubbles. A plurality of faces are simultaneously processed during each subdivision iteration by using a super buffer that contains the vertices, their neighbors, and information about each face.