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This paper describes the design of a patient-specific, radiotherapy quality assurance target that can be used to verify a treatment plan by measurement of actual dosage. Staring from a patient's (segmented) MR images, a physical model containing insertable cartridges for holding dosimeters is printed in 3D. Dosimeters can be located at specific locations of interest (e.g., tumor, nerve bundles, urethra). The model (dosimeter insert) can be placed into a pelvis 'shell' and subject to a specified treatment plan. A design for the dosimeter insert can be efficiently fabricated using rapid prototyping techniques.

This paper describes the development of a procedure to generate patient-specific, three-dimensional (3D) solid models of prostates (and related anatomy) from magnetic resonance (MR) images. The 3D models are rendered in STL file format which can be physically printed or visualized on a holographic display system. An example is presented in which a 3D model is printed following this procedure.