Sparing Parotid Ducts Via MRI Sialography for Reduced Patient-Reported Xerostomia

Inclusion Criteria: To participate in this study a subject must meet all of the eligibility criteria outlined below. Eligibility must be maintained for the subject to be considered eligible for ongoing trial participation. * Provide written informed consent to participate in the study and HIPAA authorization for release of personal health information. * Able to comply with study procedures based on the judgment of the clinical investigator. * Male or female, aged ≥ 18 years at the time of consent. * Eastern Cooperative Oncology Group performance status 0-2 at the time of consent. * Women of reproductive potential must use highly effective contraception. * T0-4, N0-3, M0 stage cancer of the oropharynx (American Joint Committee on Cancer Staging System 8th edition) planned for definitive radiotherapy +/- chemotherapy. * No contraindications for magnetic resonance imaging (MRI). Exclusion Criteria: An individual who meets any of the following criteria will be excluded from participation In this study: * Patients with Sjogren's disease or baseline xerostomia. * Patients with lesions involving the salivary glands on diagnostic imaging * Patients with an allergy to lemon juice * Prior lifetime history of radiation therapy to the head and neck * Current pregnancy or lactation.