Dosimetric optimization of a truncated conical-shaped transmission target for electronic brachytherapy X-ray source: A Monte Carlo study

The purpose of this study is to determine the optimal target configurations to improve the uniformity of dose distribution for the electronic brachytherapy source. A truncated conical-shaped transmission type was designed. Monte Carlo simulation technique was used to investigate the target thickness, geometry of electron beam, and target angle of a truncated conical-shaped target for the electronic brachytherapy X-ray source. Dosimetric parameters recommended by TG-43U1 protocol were used to determine the optimal target design of electronic brachytherapy source. The target thicknesses for maximizing the transmitted X-ray intensity were approximately 1.2 to 1.5 mu m for 0A degrees and 90A degrees. In a range of optimal thickness, transmitted X-ray intensity at 90A degrees was approximately 92% of maximum photon intensity. The effects of electron beam shapes on 2D anisotropy functions were investigated at radial distances of 0.5, 1.0, 2.0, 3.0, and 5.0 cm. Minimum variations for all radiation distances and angular ranges were observed for uniform cylindrical electron beam with a radius of 2.0 mm. Anisotropy functions at 0A degrees, F(r, 0A degrees ), were close to unity and slightly more than unity for non-uniform cylindrical (R = 1.0 - 2.0 mm) electron beam and uniform cylindrical electron beam with a radius of 2.0 mm. The angles of target anode between 45A degrees and 50A degrees show minimum fluctuations in the anisotropy functions and are close to unity for F(r, 0A degrees ). The optimal target configurations are a truncated conical-shaped target having an angle between 45A degrees and 50A degrees. It is concluded that tungsten target having the thickness of 1.2 to 1.5 mu m and uniform circular with a radius of 2.0 mm as electron beam produces optimal dosimetric characteristics for electronic brachytherapy X-ray source.
Publisher
KOREAN PHYSICAL SOC
Issue Date
2017-08
Language
English
Keywords

IR-192; PARAMETERS; PHANTOM; UPDATE; SYSTEM

Citation

JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.71, no.3, pp.178 - 184

ISSN
0374-4884
DOI
10.3938/jkps.71.178
URI
http://hdl.handle.net/10203/225590
Appears in Collection
NE-Journal Papers(저널논문)
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