MONTE CARLO CALCULATION OF SHIELDED COLPOSTAT EFFECT ON RECTUM RECEIVED DOSE IN HIGH DOSE RATE BRACHYTHERAPY WITH COBALT-60 SOURCES

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MESBAHI ASGHAR; HAGHZADEH R.A.; NASERI A.R.; SHIRAZI A.R.

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Journal: International Journal of Radiation Research Year:2015 | Volume:13 | Issue:2 Page(s): 165-171

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Title

MONTE CARLO CALCULATION OF SHIELDED COLPOSTAT EFFECT ON RECTUM RECEIVED DOSE IN HIGH DOSE RATE BRACHYTHERAPY WITH COBALT-60 SOURCES

Author(s)

MESBAHI ASGHAR | HAGHZADEH R.A. | NASERI A.R. | SHIRAZI A.R. | Issue Writer Certificate

Keywords

INTRACAVITARY BRACHYTHERAPY

SHIELDED COLPOSTAT

RECTUM DOSE

HIGH DOSE RATE BRACHYTHERPY

COBALT-60

Abstract

Background: In the current study the effect of SHIELDED COLPOSTAT on rectum received dose was calculated in cervical brachytherapy using Monte Carlo (MC) method. Materials and Methods: Two 60Co sources of GZP6 brachytherapy unit used for intracavitary treatments were simulated using MCNPX Monte Carlo code. Also the two types of colpostats including shielded and unshielded were simulated inside a water phantom. The radial dose function, depth doses and dose distribution around sources were calculated with spa' al dose resolution of 2×2×2 mm. The effect of tungsten shields on RECTUM DOSE was studied. Moreover, the accuracy of treatment planning system (TPS) was verified comparing to MC results.Results: Our results showed that SHIELDED COLPOSTATs reduce the RECTUM DOSE up to 7% according to the MC calculations. Also, it was found less than 3% difference between TPS and MC results in percentage depth dose and radial doses for unshielded case.Conclusion: It can be concluded that the application of SHIELDED COLPOSTATs provide a relatively mild protection (7% reduction in dose) for the rectum in INTRACAVITARY BRACHYTHERAPY due to the higher energy of 60Co photons. However, application of SHIELDED COLPOSTATs in treatment planning system is desirable for more accurate treatments.

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APA: Copy

MESBAHI, ASGHAR, HAGHZADEH, R.A., NASERI, A.R., & SHIRAZI, A.R.. (2015). MONTE CARLO CALCULATION OF SHIELDED COLPOSTAT EFFECT ON RECTUM RECEIVED DOSE IN HIGH DOSE RATE BRACHYTHERAPY WITH COBALT-60 SOURCES. INTERNATIONAL JOURNAL OF RADIATION RESEARCH, 13(2), 165-171. SID. https://sid.ir/paper/286629/en

Vancouver: Copy

MESBAHI ASGHAR, HAGHZADEH R.A., NASERI A.R., SHIRAZI A.R.. MONTE CARLO CALCULATION OF SHIELDED COLPOSTAT EFFECT ON RECTUM RECEIVED DOSE IN HIGH DOSE RATE BRACHYTHERAPY WITH COBALT-60 SOURCES. INTERNATIONAL JOURNAL OF RADIATION RESEARCH[Internet]. 2015;13(2):165-171. Available from: https://sid.ir/paper/286629/en

IEEE: Copy

ASGHAR MESBAHI, R.A. HAGHZADEH, A.R. NASERI, and A.R. SHIRAZI, “MONTE CARLO CALCULATION OF SHIELDED COLPOSTAT EFFECT ON RECTUM RECEIVED DOSE IN HIGH DOSE RATE BRACHYTHERAPY WITH COBALT-60 SOURCES,” INTERNATIONAL JOURNAL OF RADIATION RESEARCH, vol. 13, no. 2, pp. 165–171, 2015, [Online]. Available: https://sid.ir/paper/286629/en

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