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It contains a model of the prostate gland with a dominant intraprostatic lesion (DIL), seminal vesicles, urethra, ejaculatory duct, neurovascular bundles, rectal wall, and penile bulb generated from a series of combined T2-weighted\/dynamic contrast-enhanced magnetic resonance (MR) images. The iterative process for designing the phantom based on user interaction and evaluation is described. Using the CyberKnife System at Boston Medical Center, a treatment plan was successfully created and delivered. Dosage delivery results were validated through gamma index calculations based on radiochromic film measurements which yielded a 99.8% passing rate. This phantom is a demonstration of a methodology for incorporating high-contrast MR imaging into computed-tomography-based radiotherapy treatment planning; moreover, it can be used to perform quality assurance (QA).<\/jats:p>","DOI":"10.1115\/1.4040817","type":"journal-article","created":{"date-parts":[[2018,7,20]],"date-time":"2018-07-20T17:55:33Z","timestamp":1532109333000},"update-policy":"https:\/\/doi.org\/10.1115\/crossmarkpolicy-asme","source":"Crossref","is-referenced-by-count":4,"title":["A Three-Dimensional-Printed Patient-Specific Phantom for External Beam Radiation Therapy of Prostate Cancer"],"prefix":"10.1115","volume":"1","author":[{"given":"Christopher L.","family":"Lee","sequence":"first","affiliation":[{"name":"Mem. ASME Franklin W. Olin College of Engineering, 1000 Olin Way, Needham, MA 02492 e-mail:"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Max C.","family":"Dietrich","sequence":"additional","affiliation":[{"name":"Franklin W. 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