The investigators have developed co-registered transvaginal photoacoustic and ultrasound (US) imaging techniques that allow them to visualize ovarian tumor structure and functional changes simultaneously, which may potentially reveal early tumor angiogenesis development or residual tumors after systemic treatment that is not available by US alone. The ability to detect early angiogenesis changes, as well as tumor morphology changes using a non-invasive imaging modality will greatly enhance the care for patients. The investigators plan to explore these techniques in monitoring cervical cancer treatment response and conduct pilot feasibility studies.