title: Is it time to change the standard of care from CT to MRI for defining the apex of the prostate to accomplish potency-sparing radiotherapy?
authors.forename: Mack
authors.initials: M
authors.lastname: Roach
mesh_terms: D006801:Humans; D018783:Impotence, Vasculogenic / Q000517:prevention & control*; D008279:Magnetic Resonance Imaging; D008297:Male; D010413:Penis / Q000033:anatomy & histology* / Q000098:blood supply / Q000000981:diagnostic imaging; D011467:Prostate / Q000000981:diagnostic imaging / Q000473:pathology; D011471:Prostatic Neoplasms / Q000532:radiotherapy*; D011879:Radiotherapy Dosage; D014057:Tomography, X-Ray Computed