A remote guidance system for a medical device is provided that is capable of use with magnetic resonance imaging and other environments with a relatively high level of electromagnetic interference. In one embodiment, a fluid control system controls delivery of fluid to a fluid conduit supplying a fluid chamber of a fluid housing. A piston disposed within the fluid chamber moves in response to a change in fluid displacement in the chamber and causes corresponding movement of the medical device within a body. In another embodiment, means are provided for controlling a connector coupled to the medical device at a location outside the body wherein movement of the connector causes a corresponding movement of the medical device. A sensor generates a signal indicative of a characteristic associated with movement of the medical device. The sensor includes an optic fiber that transmits a light wave indicative of the characteristic.
