1. A system to track the movement of a target positioned in a MRI device comprising: a structured light generator producing a structured light signal related to the target; a receiver receiving the structured light signal and translating it into data related to the movement of the target; a feedback loop connected to the receiver and the MRI device, for supplying the data to the MRI device; and, a field adjustment means connected to the MRI device for adjusting the imaging capability of the MRI device in response to the movement of the target.