Designed and Validation of In-House Head and Neck Phantom for Quality Assurance and Radiotherapy Dose Measurements
محل انتشار: مجله فیزیک پزشکی ایران، دوره: 20، شماره: 5
سال انتشار: 1402
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 32
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شناسه ملی سند علمی:
JR_IJMP-20-5_005
تاریخ نمایه سازی: 24 دی 1402
چکیده مقاله:
Introduction: In radiotherapy treatment of head and neck (H&N) cancers, more complex quality assurance checks and patient-specific dosimetry are required to ensure accuracy in modern technology. In this paper, a new cost-effective human tissue equivalent H&N phantom was designed to serve as an economical and adaptable tool for assessment and assurance of precise radiotherapy dose delivery. Material and Methods: The phantom was designed using locally available paraffin wax and tissue-equivalent materials. Computed tomography (CT) images of the phantom were acquired using a conventional CT simulator and were registered with the images of a real patient having approximately similar physical dimensions. The geometric and attenuation properties of the structures in the phantom were studied and compared to the structures of the real patient. Results: Hounsfield unit (HU) values of different structures of the phantom were compared to the values obtained from the CT images of a real patient and were found to be in good agreement. HU values obtained for the right, and left eye, brain, larynx, and bone shell were ۷(±۱۰) HU, ۶(±۹), ۳۰(±۱۴) HU, -۹۸۴(±۶) HU and ۸۷۳(±۲۱۴) HU in phantom. Structures simulated in phantom agreed well on comparison regarding both their design and radiation properties with respect to real patient human tissues. Gamma analysis was performed for the axial dose plane at plan isocenter for both the calculated dose distribution in H&N phantom and the patient agrees for ۹۸.۷۹% passing rate for ۳% /۳mm criteria. Conclusion: The designed phantom depicts human anatomy and meets the requirements of tissue equivalence. The result shows that phantom has proved to be a cost-effective and valuable tool for accurate verification of dose distributions in regions of clinical and dosimetric interests.
نویسندگان
mamta mahur
۱. Department of Radiotherapy, Delhi State Cancer Institute, Dilshad Garden, Delhi – ۱۱۰۰۹۵, India ۲. II. Department of Physics, School of Basic Sciences & Research, Sharda University, Greater Noida, Uttar Pradesh- ۲۰۱۳۱۰, India
Munendra Singh
Department of Physics, School of Basic Sciences and Research, Sharda University, Greater Noida, India
Om Prakash Gurjar
Government Cancer Hospital, MGM Medical College, Indore
Manoj Kumar Semwal
Army Hospital (Research & Referral), Delhi Cantonment, New Delhi-۱۱۰۰۱۰, India
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