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Momeni Harzanji, Zahra, Larizadeh, Mohammad Hassan, Namiranian, Nasim, Nickfarjam, Abolfazl. (1401). Evaluation and Comparison of Dosimetric Characteristics of Semiflex®3D and Microdiamond in Relative Dosimetry under 6 and 15 MV Photon Beams in Small Fields. سامانه مدیریت نشریات علمی, 12(5), 477-488. doi: 10.31661/jbpe.v0i0.2008-1160
Zahra Momeni Harzanji; Mohammad Hassan Larizadeh; Nasim Namiranian; Abolfazl Nickfarjam. "Evaluation and Comparison of Dosimetric Characteristics of Semiflex®3D and Microdiamond in Relative Dosimetry under 6 and 15 MV Photon Beams in Small Fields". سامانه مدیریت نشریات علمی, 12, 5, 1401, 477-488. doi: 10.31661/jbpe.v0i0.2008-1160
Momeni Harzanji, Zahra, Larizadeh, Mohammad Hassan, Namiranian, Nasim, Nickfarjam, Abolfazl. (1401). 'Evaluation and Comparison of Dosimetric Characteristics of Semiflex®3D and Microdiamond in Relative Dosimetry under 6 and 15 MV Photon Beams in Small Fields', سامانه مدیریت نشریات علمی, 12(5), pp. 477-488. doi: 10.31661/jbpe.v0i0.2008-1160
Momeni Harzanji, Zahra, Larizadeh, Mohammad Hassan, Namiranian, Nasim, Nickfarjam, Abolfazl. Evaluation and Comparison of Dosimetric Characteristics of Semiflex®3D and Microdiamond in Relative Dosimetry under 6 and 15 MV Photon Beams in Small Fields. سامانه مدیریت نشریات علمی, 1401; 12(5): 477-488. doi: 10.31661/jbpe.v0i0.2008-1160

Evaluation and Comparison of Dosimetric Characteristics of Semiflex®3D and Microdiamond in Relative Dosimetry under 6 and 15 MV Photon Beams in Small Fields

Journal of Biomedical Physics and Engineering
مقاله 5، دوره 12، شماره 5، دی 2022، صفحه 477-488    اصل مقاله (1.4 M)
نوع مقاله: Original Research
شناسه دیجیتال (DOI): 10.31661/jbpe.v0i0.2008-1160
نویسندگان
Zahra Momeni Harzanji1؛ Mohammad Hassan Larizadeh2؛ Nasim Namiranian3؛ Abolfazl Nickfarjam* 4
1MSc, Department of Medical Physics, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
2MD, Department of Radiation Oncology, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
3MD, Yazd Diabetes Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
4PhD, Department of Medical Physics, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
چکیده
Background: In modern radiotherapy techniques, the frequently small and non-uniformed fields can increase treatment efficiency due to their highly conformal dose distribution. Particular features including lack of Lateral Charge Particle Equilibrium (LCPE) lead to detectors with high resolution since any error in obtained dosimetric data could cause patient mistreatments.
Objective: This study aims to evaluate and compare two small detectors (Semiflex®3D and microdiamond) dosimetric characteristics in small field relative dosimetry.
Material and Methods: In this experimental study, the dosimetric properties of Semiflex®3D and microdiamond were assessed under 6 and 15 MV photon beams. The linearity and stability of the detector’s response and dose rate were measured. Square-field sizes ranging from 0.6×0.6 - 5×5 cm2 were used for obtaining percentage depth dose curves (PDDs) and in-plane profiles. The angular and temperature dependence of both detectors’ responses were also studied.
Results: The detector response shows good stability, no deviation from linearity, and low dose rate dependence (≤1.6%). PDDs and in-plan profiles of both detectors are in good agreement and no significant difference was observed except for the high dose gradient regions (P-value≤0.017). Both detectors demonstrated low angular dependence (<0.3%) with temperature dependence lower than 1% for both detectors. 
Conclusion: The results indicate both investigated detectors were well performed in small field relative dosimetry and for measuring penumbra, it is better to use microdiamond detector.
کلیدواژه‌ها
Radiotherapy, Conformal؛ Radiotherapy, High-Energy؛ Radiation Dosimeters؛ Small Field Dosimetry
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