Comparing an Investigational Scan (F-18 NaF PET/CT) to Standard of Care Imaging (F-18 FDG PET/CT) for Evaluating Vascular Complications in Patients Receiving Radiation Therapy for Head and Neck Cancer

Inclusion Criteria: * Males and females 18 years of age and older * Diagnosis of clinical stage III-IVb (American Joint Committee on Cancer \[AJCC\] 8th edition) squamous cell carcinoma of the oropharynx (human papillomavirus \[HPV\]-negative), larynx, or hypopharynx, or clinical stage I-III (AJCC 8th edition) HPV-associated squamous cell carcinoma of the oropharynx receiving curative-intent, organ preservation (non-surgical) * Treatment with concurrent chemoradiotherapy per institutional standard of care at the discretion of Medical Oncology. RT is delivered per institutional standard of care at the discretion of Radiation Oncology * Patients must give protocol-specific consent on an Institutional Review Board (IRB)-approved consent form prior to completion of protocol-specific testing/procedures * Women are eligible to participate in the study if they meet one of the following criteria: * Females of childbearing potential (FCBP) must have a negative pregnancy test at baseline and follow-up visit. Women of childbearing potential must undergo pregnancy testing during each study visit and agree to use at least one of the following methods of contraception throughout the study duration: * Oral contraceptives, transdermal contraceptives, injectable or implantable methods, intrauterine devices, and/or vaginal ring * Women who are postmenopausal (for at least one year), sterile, or hysterectomized; * Women who have undergone tubal ligation will be required to undergo pregnancy testing during each study visit Exclusion Criteria: * Adults who are unable to consent * Pregnant women * Prisoners * Patients who have had chemotherapy or radiotherapy within 4 weeks prior to entering the study or those who have not recovered from adverse events due to agents administered more than 4 weeks earlier (i.e., have residual toxicities \> grade 1) * Patients who are receiving any other investigational agents or an investigational device within 21 days before administration of the F-18 NaF for the pre-RT PET/CT imaging * Patients planned to receive any immunotherapy agent during their radiotherapy or in the interval between radiotherapy and post-RT PET/CT imaging * History of allergic reactions attributed to compounds of similar chemical or biological composition to F-18 NaF or other agents used in the study * Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements * Significant cardiovascular disease (eg, myocardial infarction, arterial thromboembolism, cerebrovascular thromboembolism) within 3 months prior to study entry; angina requiring therapy; symptomatic peripheral vascular disease; New York Heart Association class 3 or 4 congestive heart failure; or uncontrolled grade \>= 3 hypertension (diastolic blood pressure \>= 100 mmHg or systolic blood pressure \>= 160 mmHg) despite antihypertensive therapy