Each patient will undergo three DCE-MRI (dynamic contrast-enhanced MRI) studies: a baseline DCE-MRI within two weeks before chemoradiation; a second DCE-MRI after the second week of treatment (within a week); and a third DCE-MRI three months after treatment. As a pilot study in 10 patients, we will perform 18F-FMISO PET/CT on the same day of a baseline DCE-MRI before chemoradiation. Treatment decisions will not be based on DCE-MRI and 18F-FMISO PET/CT studies.

DCE-MRIs: (i) Baseline DCE-MRI within two weeks before chemoradiation; (ii) Second DCE-MRI after the second week of chemoradiation (within a week); (iii) Third DCE-MRI three months after chemoradiation. iii. 18F-FMISO PET: Baseline 18F-FMISO PET within two weeks before chemoradiation (only 10 patients as a pilot study). iv. Clinical Follow-up: (i) Physical examination (every 3 months); (ii) Pap smear or cervical biopsy (every 3 months); (iii) follow-up imaging studies (CT and/or MRI) as per routine clinical follow-up of patients.

For each DCE-MRI parameter, the relative percent change from baseline to the two-week measurement will be calculated. These values will be assessed using ROC curves to evaluate whether they are predictive of tumor response.

baseline tumor perfusion parameters are predictive of disease-free survival at 2 years and 5 years, the primary analysis will again be an ROC analysis, but with the ROC curves modified to take into account the censored failure-outcome. We will create time-dependent ROC curves using methods described by Heagerty et al.