Inclusion Criteria:  Biopsy proven prostate cancer patients who are scheduled to undergo prostatectomy. Patient who is scheduled to have a clinically indicated staging endorectal prostate MRI exam. Patients who have signed their informed consent form to undergo the study.  Exclusion Criteria:  Known prior hormone ablation or radiation therapy (pelvic or prostate). Patients who do not want to undergo prostatectomy and prefer other therapy or surveillance. Contraindication to conventional MR imaging (e. g. metal implants, pace maker, etc.).