Room to Move: Enhancing Head and Neck Radiotherapy with a 6 Degree of Freedom Couch

Summary: Image guided radiation therapy (IGRT) allows for a reduction in target volume margins but relies on accurate daily set-up. Recent introduction of 6 degree of freedom (DOF) couches allow for translational shifts and rotational adjustments along the roll, pitch, and yaw axes. We seek to evaluate the impact of rotational adjustments on both target coverage and critical structure dose in head and neck radiotherapy.