Synchronization drive for a longitudinal axis telescopic guidance mechanism

Certain embodiments include a system and method for synchronized telescopic guidance along a longitudinal axis in a patient positioning system. The system includes a top channel driven by a motor, a bottom channel synchronized with the top channel, and a rack and pinion for transmitting drive from the top channel to the bottom channel. The bottom channel is driven by the top channel. The system may also include a gear for transmitting drive from the top channel to the bottom channel using the rack and pinion. The system may also include a plurality of racks and pinions for transmitting drive from the top channel to the bottom channel. Additionally, the size of the pinion meshing with the top channel may be half the size of the pinion meshing with the bottom channel. The bottom channel may move along the top channel.