Real-Time kV Imaging vs. Real-Time 3D Patient Surface Tracking for Head & Neck Cancer

Comparison of Intrafraction Motion in Patients With Head and Neck Cancer Using Real-Time kV Imaging vs. Real-Time 3D Patient Surface Tracking

To determine if a new optical system that can track a patient's movement during treatment can be used to measure motion and allow for motion adjustments in order to decrease the amount of healthy tissue that receives radiation without limiting our ability to cure cancers using radiation.

Inclusion Criteria:

• Patients with HNC undergoing radiation therapy at Stanford University
• Age >= 18 years old
• Radiation course >= 4 weeks duration
• Ability to understand and the willingness to sign a written informed consent document.

Exclusion Criteria:

• Factors such as claustrophobia inhibiting use of thermoplastic mask immobilization device.
• Patients who are pregnant or nursing, which preclude them from undergoing active radiation treatment.