Evaluation of On-Couch CBCT Image Quality

Inclusion Criteria: * Patient age is ≥ 18 years old. * Patient has a diagnosis of primary or metastatic cancer, including but not limited to tumors arising from or involving the head/neck, lungs, liver, pancreas, prostate, urinary bladder, rectum, cervix or uterus. * A previous (standard-of-care) decision was made to treat the patient with radiation therapy using a Varian TrueBeam treatment system. * A previous (standard-of-care) decision was made to treat the patient with a radiation dose of at least 20 Gy in at least 5 fractions, one fraction per day on consecutive days, Monday to Friday. * Patient is willing and able to provide informed consent to participate in the study. Exclusion Criteria: * Patient is pregnant or has plans for pregnancy during the period of treatment. * Patient is part of a vulnerable population (per ISO 14155:2020, "individuals who are unable to fully understand all aspects of the investigation that are relevant to the decision to participate, or who could be manipulated or unduly influenced as a result of a compromised position, expectation of benefits or fear of retaliatory response").