Inclusion Criteria:  Male patients who are 18 years and older Histologically or cytologically proven prostate carcinoma s/p definitive radiation Patients suspected to have BCR based on phoenix criteria (prostate specific antigen value (PSA) of 2 ng/mL above the PSA nadir) Ability to understand and willingness to sign informed consent  Exclusion Criteria:  Patients with any medical condition or circumstance that the investigator believes may compromise the data collected or lead to a failure to fulfil the study requirements. Patients with contraindication to undergo MRI Patients with prior allergy to MRI contrast agent. Extreme Claustrophobia