Techniques are provided for de-aliasing depth images. The channel assignment method includes obtaining information about signal modulation schemes from a plurality of optical transmitters, and assigning channels to the respective optical transmitters in consideration of the obtained information about the signal modulation schemes. The lift mechanism employs a cable system to raise both sides of the rack simultaneously, with the rack positioned within or outside the washing chamber and with the rack either loaded or unloaded. Effects that are inapplicable to the selected zone are hidden from view and not displayed. To meet stringent medical requirements, the system generates and senses pulsed DC magnetic fields embodied in an assemblage of miniaturized, disposable and reposable sensors functional with both dipole and co-planar transmitters.