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Gholami, M H, Sadeghi, M, Babapour Mofrad, F, Mohammadi, M. (1399). Comparison of the 2-D Dose Distribution Calculated by Planning System and Measured by Gafchromic Film Physical Dosimetry for 60Co and 192Ir Brachytherapy Sources. سامانه مدیریت نشریات علمی, 10(3), 299-306. doi: 10.31661/jbpe.v0i0.1912-1004
M H Gholami; M Sadeghi; F Babapour Mofrad; M Mohammadi. "Comparison of the 2-D Dose Distribution Calculated by Planning System and Measured by Gafchromic Film Physical Dosimetry for 60Co and 192Ir Brachytherapy Sources". سامانه مدیریت نشریات علمی, 10, 3, 1399, 299-306. doi: 10.31661/jbpe.v0i0.1912-1004
Gholami, M H, Sadeghi, M, Babapour Mofrad, F, Mohammadi, M. (1399). 'Comparison of the 2-D Dose Distribution Calculated by Planning System and Measured by Gafchromic Film Physical Dosimetry for 60Co and 192Ir Brachytherapy Sources', سامانه مدیریت نشریات علمی, 10(3), pp. 299-306. doi: 10.31661/jbpe.v0i0.1912-1004
Gholami, M H, Sadeghi, M, Babapour Mofrad, F, Mohammadi, M. Comparison of the 2-D Dose Distribution Calculated by Planning System and Measured by Gafchromic Film Physical Dosimetry for 60Co and 192Ir Brachytherapy Sources. سامانه مدیریت نشریات علمی, 1399; 10(3): 299-306. doi: 10.31661/jbpe.v0i0.1912-1004

Comparison of the 2-D Dose Distribution Calculated by Planning System and Measured by Gafchromic Film Physical Dosimetry for 60Co and 192Ir Brachytherapy Sources

Journal of Biomedical Physics and Engineering
مقاله 7، دوره 10، شماره 3، شهریور 2020، صفحه 299-306    اصل مقاله (743.64 K)
نوع مقاله: Original Research
شناسه دیجیتال (DOI): 10.31661/jbpe.v0i0.1912-1004
نویسندگان
M H Gholami1؛ M Sadeghi* 2، 3؛ F Babapour Mofrad4؛ M Mohammadi5، 6
1MSc, Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
2PhD, Finetech in Medicine Research Center, Iran University of Medical Sciences, Tehran, Iran P.O. Box: 14155-6183, Tehran, Iran
3PhD, Medical Physics Department, School of Medicine, Iran University of Medical Sciences, P.O. Box: 14155-6183, Tehran, Iran
4PhD, Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
5PhD, Department of Medical Physics, Royal Adelaide Hospital, Adelaide, SA 5000 Australia
6PhD, School of Physical Sciences, the University of Adelaide, SA 5005 Australia
چکیده
Background: High Dose Rate (HDR) brachytherapy sources with high photon energy have been widely used in treating tumors. Dosimetric parameter of these brachytherapy sources should be determined according to the AAPM TG-43 recommendation. Gafchoromic films are reliable tools for this evaluation.
Objective: The aim of this study is to evaluate and compare dose accuracy of the two-brachytherapy sources in a dedicated phantom.
Material and Methods: In this analytical study, two common sources, including Cobalt and Iridium, were loaded into the dedicated phantom. The two-dimensional dose distribution around the source was calculated by TPS system for certain activities and geometries around the sources. Then, the experimental dose measured by Gafchromic film dosimetry was reported for different angles ranging from 0 to 180 degrees.
Results: The difference between calculated and measured doses was less than 6 percent (-5 to +6 percent) for all of the channels and angles. These errors are smaller and mainly more than zero (Dfilm>DTPS) for angles less than 20 and larger than 110 degrees. There is no statistically significant discrepancy in dose calculation by treatment planning system.
Conclusion: Although the estimated error in dose calculation is not significant, there is still an opportunity to increase the treatment precision. The correlation between the error and the angle should be considered in further plans of brachytherapy. The present study showed comparable errors compared to results of other research studies.
کلیدواژه‌ها
Brachytherapy؛ Film Dosimetry؛ Cobalt-60؛ Iridium-192
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