Design of a Compacted-sized Eye-Tracking System with Indexed Gaze Target for Ring Gantry Linear Accelerators: Verification Study Using a Motorized Eye Phantom.

Eye-tracking systems and gaze targets provide effective immobilization of the eye during ocular radiation therapy treatment. This study proposes a compact-sized eye-tracking system with a gaze target to provide a simple setup in a ring gantry LINAC. The device should have accurate repositioning, while the gaze target should be easily interchangeable.