Development of a Program to Perform Automatic Shielding Evaluation Using Patient Data
DH Choi1*, SH Ahn2, DW Kim1, SH Choi3, YJ Jang3, NH KWON1, JH Seok1, SH Park4, WS Ahn5, JS Kim1, (1)Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, Republic of Korea, (2) Department of Medicine, Ewha Womans University College of Medicine, Seoul, Republic of Korea, (3) Research Team of Radiological Physics and Engineering, Korea Institute of Radiological and Medical Sciences, Seoul, Republic of Korea, (4) Department of Radiation Oncology, Jeju National University College of Medicine, Jeju, Republic of Korea, (5) Department of Radiation Oncology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Republic of Korea
Presentations
PO-GePV-T-434 (Sunday, 7/10/2022) [Eastern Time (GMT-4)]
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Purpose: The purpose of this study is to develop a program that automatically analyzes the DICOM RT (Digital Imaging and Communications in Medicine Radiation Therapy) plan file of the treated patient and applies it to the shielding evaluation.
Methods: MATLAB App Designer was used for GUI-based program development and analysis of DICOM RT plan files. The parameters required for shielding calculations, intensity modulated radiation therapy (IMRT) factor, and use factor were calculated from the DICOM RT plan file. Shielding calculation formulas was based on the National Council on Radiation Protection and Measurements (NCRP)-151 report. In addition, the maximum number of treatable patients calculated according to the radiation usage plan for each treatment room. For program evaluation and verification, the results of transmitted dose measured using a detector in 7 linacs at 4 institutions for 1 week (2021.09.01~2021.09.07) were compared with the program results. At this time, 30~67 DICOM RT Plan files were used.
Results: The program was able to automatically perform the treatment room shielding evaluation and calculate the number of treatable patients. The average IMRT factor calculated from the patient data of the pilot institution was 3.0±0.9, confirming the difference of up to 58.8% from the current IMRT factor 5. In addition, the use factor showed a difference of up to 33.8% compared to the NCRP-151 value. The transmission dose measurement data using the detector and the program result showed a difference of up to 0.01145 mSv/week. In all results, the results of the program were calculated higher than the measurement results.
Conclusion: The program developed in this study performs shielding evaluation in consideration of the clinical environment for each treatment room, and it is considered that it can be used as a safety regulation technique and construction of a real-time shielding management system using actual patient data.
Funding Support, Disclosures, and Conflict of Interest: Granted by the Nuclear Safety and Security Commission (NSSC) of the Republic of Korea (No. 2003013), No. 2020M2D9A09417012), supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (No. 2018R1D1A1B07050217, No. 2021R1I1A1A01057995), and funded by Asan Foundation (2021IC003).
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