INVESTIGATION OF THE EFFECTS OF TISSUE INHOMOGENEITIES ON THE DOSIMETRIC PARAMETERS OF A CS-137 BRACHYTHERAPY SOURCE USING THE MCNP4C CODE

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ZEHTABIAN MEHDI; FAGHIHI REZA; SINA SEDIGHEH; NOORIZADEH AZIMEH

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Journal: IRANIAN JOURNAL OF MEDICAL PHYSICS Year:2010 | Volume:7 | Issue:3 (28) Page(s): 15-20

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Title

INVESTIGATION OF THE EFFECTS OF TISSUE INHOMOGENEITIES ON THE DOSIMETRIC PARAMETERS OF A CS-137 BRACHYTHERAPY SOURCE USING THE MCNP4C CODE

Author(s)

ZEHTABIAN MEHDI | FAGHIHI REZA | SINA SEDIGHEH | NOORIZADEH AZIMEH | Issue Writer Certificate

Keywords

BRACHYTHERAPYQ3

DOSE RATE CONSTANTQ3

DOSIMETRYQ3

TG-43Q3

Abstract

Introduction: BRACHYTHERAPY is the use of small encapsulated radioactive sources in close vicinity of tumors. Various methods are used to obtain the dose distribution around BRACHYTHERAPY sources. TG-43 is a DOSIMETRY protocol proposed by the AAPM for determining dose distributions around BRACHYTHERAPY sources. The goal of this study is to update this protocol for presence of bone and air inhomogenities.Material and Methods: To update the DOSE RATE CONSTANT parameter of the TG-43 formalism, the MCNP4C simulations were performed in phantoms composed of water-bone and water-air combinations. The values of dose at different distances from the source in both homogeneous and inhomogeneous phantoms were estimated in spherical tally cells of 0.5 mm radius using the F6 tally.Results: The percentages of dose reductions in presence of air and bone inhomogenities for the Cs-137 source were found to be %4 and %10, respectively. Therefore, the updated DOSE RATE CONSTANT (L) will also decrease by the same percentages.Discussion and Conclusion: It can be easily concluded that such dose variations are more noticeable when using lower energy sources such as Pd-103 or I-125.

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APA: Copy

ZEHTABIAN, MEHDI, FAGHIHI, REZA, SINA, SEDIGHEH, & NOORIZADEH, AZIMEH. (2010). INVESTIGATION OF THE EFFECTS OF TISSUE INHOMOGENEITIES ON THE DOSIMETRIC PARAMETERS OF A CS-137 BRACHYTHERAPY SOURCE USING THE MCNP4C CODE. IRANIAN JOURNAL OF MEDICAL PHYSICS, 7(3 (28)), 15-20. SID. https://sid.ir/paper/96942/en

Vancouver: Copy

ZEHTABIAN MEHDI, FAGHIHI REZA, SINA SEDIGHEH, NOORIZADEH AZIMEH. INVESTIGATION OF THE EFFECTS OF TISSUE INHOMOGENEITIES ON THE DOSIMETRIC PARAMETERS OF A CS-137 BRACHYTHERAPY SOURCE USING THE MCNP4C CODE. IRANIAN JOURNAL OF MEDICAL PHYSICS[Internet]. 2010;7(3 (28)):15-20. Available from: https://sid.ir/paper/96942/en

IEEE: Copy

MEHDI ZEHTABIAN, REZA FAGHIHI, SEDIGHEH SINA, and AZIMEH NOORIZADEH, “INVESTIGATION OF THE EFFECTS OF TISSUE INHOMOGENEITIES ON THE DOSIMETRIC PARAMETERS OF A CS-137 BRACHYTHERAPY SOURCE USING THE MCNP4C CODE,” IRANIAN JOURNAL OF MEDICAL PHYSICS, vol. 7, no. 3 (28), pp. 15–20, 2010, [Online]. Available: https://sid.ir/paper/96942/en

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