[1] SGRT uses cameras to feed data into a software program linked to the linear accelerator delivering the radiation.
[2] Each camera uses a projector and image sensors to create a 3D surface model of a patient, by projecting a red light containing a pseudo-random speckle pattern on their skin.
Information on movements is fed back to the radiation therapist, who is alerted if the patient moves from the optimal position (as determined by their treatment plan).
[8] When used with deep inspiratory breath-hold, SGRT supports initial positioning, both in free breathing (at mid-patient reference point) and in DIBH (at treatment isocenter).
It has also been used with Stereotactic Body Radiation Therapy to assist with the initial set-up and detect intrafraction patient motion throughout treatment.