Ovarian-Sparing Adaptive Radiotherapy in Young Adult Women

Inclusion Criteria: * Biologic female * Age between 18 and 50 years old (inclusive) * Clinically premenopausal (defined as having active, regular menstruation without vasomotor symptoms) * At least one of two ovaries readily visualized on diagnostic CT or MR imaging as confirmed by radiologist * Planning to receive radiation therapy (for any indication) * Ability to understand and willingness to sign an IRB-approved written informed consent document. Exclusion Criteria: * Prior pelvic radiation * Prior cancer therapies that are known to impact ovarian function * Prior diagnosis of ovarian insufficiency/failure or menopause * Clinically peri- or post-menopausal * For patients \> 45 years old, if there is a clinical history of vasomotor symptoms OR irregular periods, then the patient must be excluded. * For patients ≤ 45 years old, if there is a history of vasomotor symptoms consistent with menopause OR irregular menstruation for ≥3 months OR recent changes in their menstrual cycle \> 14 days, then the patient must be excluded. * Surgically removed or transposed ovaries * Pregnant and/or breastfeeding