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A Feasibility Study of 3D Printing Plastic Scintillation Detector for Intensity Modulated Radiation Treatment (IMRT) Plan Verification

H Yang1*, T Kim2 , H Chung3 , T Suh1 , (1) Catholic University of Korea, College of Medicine, Seoul, Republic of Korea, (2) Hanyang University, Seoul, Republic of Korea, (3) Seoul National University College of Medicine, Seoul, Republic of Korea


(Sunday, 7/29/2018) 3:00 PM - 6:00 PM

Room: Exhibit Hall

Purpose: This study was aimed to validate a feasibility of a novel three-dimensional (3D) printing plastic scintillation detector (PSD) in the shape of a specific tumor for verification of intensity modulated radiation therapy (IMRT) plans.

Methods: : In this study, we performed Monte Carlo simulation in order to determine design characteristics of 3D printing detector to measure the absorbed energy in a tumor and a human organ for patient specific quality assurance (QA) and developed the optimized plastic scintillation detector made by 3D printing method. The IMRT planning was performed with the selected tumor-shaped scintillator. The measurement of absorbed energies in typical tumor region and organ at risk (OAR) using the developed detector was done. We compared the results with assessment performed by existing methods such as using radiochromic film and ion chamber.

Results: We confirmed the accuracy of the absorbed energy measured by a tumor-shaped plastic scintillator. Our results were applicable to provide user’s guideline of the developed plastic scintillation detector. The measurement was in good agreement and the measurement uncertainty of absorbed dose in the tumor was within 3%. Therefore, it could apply to the absorbed measurement of the absorbed dose as well as relative distribution simultaneously.

Conclusion: We have developed a novel plastic scintillation detector for patient specific IMRT QA. In this work, we demonstrated the feasibility of using 3D printing tumor-shaped scintillator for verification of a high precise IMRT patient plan. This study was to present a novel paradigm in radiotherapy plan verification process by using the absorbed total energy to the tumor or organs.


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