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Objective: To construct the cylindrical head and neck phantom using the three-dimensional printer for dosimetric verification in radiation therapy. Material and Medthod: The cylindrical head and neck phantom was constructed the using the three-dimensional printer. Inside the model is composed of soft tissue was constructed from para rubber latex, for planning target volume (PTV), organ at risk (OAR) and wall of phantom using acrylonitrile butadiene styrene from a three-dimensional printer, bone was made from resin mixed with calcium carbonate. Results: The computed tomography (CT) number of head and neck phantom was simulated with a CT simulator show that the soft tissue, PTV and OAR lie between -2 to 56 Hounsfield units (HU), -282 to -196 HU respectively, bone lies between 731 to 852 HU and wall of phantom lie between -152 to -89 HU. The average percent dose difference between calculated dose and measured dose in three-dimensional conformal radiotherapy (3DCRT) was 0.7%. Conclusion: The cylindrical head and neck phantom can be used to evaluate 3DCRT dose treatment planning and delivery.

Development of Cylindrical Head and Neck Phantom Using 3d Printing for Dosimetric Verification in Radiation Therapy