RecruitingPhase 2Drug trialMagnetic Resonance (MR) Imaging With Hyperpolarized 13C-Pyruvate +/- 13C,15N-Urea in Patients With Prostate CancerThis is a Phase 2 clinical study of hyperpolarized (HP) 13C-pyruvate (13C), 15N-urea (13C,15N) metabolic MR imaging in prostate cancer patients who are undergoing or have received radiation therapy for prostate cancer.