Currently, there is limited knowledge of cervical organ motion. Previous studies have evaluated interfractional cervical motion [daily set-up variation, i.e. the location of the cervix on Day 1 vs. Day 2 or Day 30 of radiation treatment] with weekly CT and MRI scans or localization of fiducial markers evaluated by fluoroscopy daily before radiation therapy. There is no published literature regarding intrafractional cervical motion [motion during a single radiation treatment]. We propose a prospective clinical trial utilizing the Calypso® 4D Localization System™ to evaluate intrafractional and interfractional cervical motion for intact cervical cancer.