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Iranian Journal of Medical Physics، جلد ۱۶، شماره ۳، صفحات ۲۳۲-۲۴۰
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عنوان انگلیسی Penumbra Measurements and Comparison of In-House and Standard Circular Cones by the Gafchoromic Film, Pinpoint Ion Chamber, and MCNPX Monte Carlo Simulation
چکیده انگلیسی مقاله Introduction: Penumbra is an important property of the radiation beam to obtain a suitable margin surrounding the target volume. Therefore, the precise penumbra width determination in stereotactic radiotherapy is necessary for treatment planning. This study aimed to compare the obtained results of penumbra width by in-house and standard circular cones by different dosimeters, as well as evaluating the function of EBT3 for dosimetric properties of the small field radiation. Material and Methods: Different circular cones were mounted on the head of the accelerator to produce 12, 20, and 40 mm field sizes at isocenter. Dosimetric measurements were performed with the EBT3 film, PinPoint ion chamber. Afterwards, MCNPX Monte Carlo simulation was used to evaluate the dosimetric parameters. Results: According to the obtained results, the penumbra width was increased by larger diameters of circular cones. The obtained measured data by PinPoint ion chamber showed a larger penumbra width compared to those calculated by Monte Carlo at all field sizes. The gamma index analysis revealed  distance-to-agreement and dose-difference of 2 mm /2%/ at all points. The results of this study showed that source to diaphragm distance had a major role in penumbra size determination of small field dosimetry with PinPoint ion chamber, EBT3 film, and Monte Carlo simulation. Conclusion: As findings of this study reported, EBT3 films are reliable detectors for relative dosimetry due to high spatial resolution for small field sizes. Furthermore, they can be used for measuring beam profile and percentage depth dose curves.
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نویسندگان مقاله | Sareh Tajiki
Radiotherapy Oncology Research Center, Cancer Institute, Tehran University of Medical Sciences,Tehran, Iran.


| hassan nedaie
radiotherapy oncology department, cancer research centre, Tehran university of medical sciences,Tehran,Iran


| Mahbod Esfehani
Radiotherapeutic Oncology Department of Cancer Institute, Tehran, Iran


| Ghazale Geraily
Department of Medical Physics, Tehran University of Medical Science, Tehran, Iran


| mohsen hassani
Department of Radiotherapy Physics, Cancer Research Centre, cancer Institute, Tehran University of Medical Sciences, Tehran, Iran


| Ali Rastjoo Ardakani
Tehran University of Medical Sciences


| Ehsan Mohammadi
Radiotherapy Oncology Research Center, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran


| mansur naderi
Radiotherapy Oncology Department, Cancer Research Centre, Tehran University of Medical Sciences, Tehran, Iran
نشانی اینترنتی http://ijmp.mums.ac.ir/article_11751.html
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/145/article-145-1442333.pdf
کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده
نوع مقاله منتشر شده Original Paper
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