RecruitingClinical trialNew MRI Biomarkers in Head and Neck CancersMagnetic resonance imaging (MRI) is a diagnostic technique that takes pictures of organs of the body. It uses magnetic fields and radio waves that cannot be felt. This makes specific organs, blood vessels, or tumors easier to see. Diffusion MRI lets us measure the motion of water in the tumor. The purpose of this study is to see if new MRI methods can give us more information about the tumor.