The increasing accuracy of external radiotherapy instruments such as intensity modulated radiotherapy, CyberKnife, and proton beam has enabled pursuit of the concept of “male lumpectomy” for prostate cancer treatment [1]. This would parallel accept breast cancer treatment regimens. A critical aspect of any radiotherapy treatment is the quality assurance (QA) that the patient is receiving the planned dose delivery. A three-dimensional phantom can be used to verify and validate the spatial energy distribution, total amount, and consistency of dosage. Typically, a phantom with a simple, uniform geometry is used. Although anthropomorphic, the phantoms described in Refs. [2] and [3] were constructed based upon a representative size and shape of a patient. Radiation detectors (e.g., ion chambers, thermoluminescent dosimeter, and radiochromic film) are built into the phantom at specific fixed locations (e.g., prostate and bladder). These locations cannot be moved...

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