Conventional ultrasound imaging systems typically include a hand-held probe coupled to a processing and display unit. The controller connects the backup battery to the lamp upon detection of an emergency condition and loss of main power. Specifically, the column select signal controls a semiconductor junction that interrupts the data connection to the gate. A console is disclosed that communicates with each of a plurality of converged communications systems, e. The space between the two groups of teeth is substantially free of teeth or has projections whose average length is smaller than the average length of the teeth in the groups of teeth.