• Title/Summary/Keyword: Intravascular brachytherapy

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Conceptual Source Design and Dosimetric Feasibility Study for Intravascular Treatment: A Proposal for Intensity Modulated Brachytherapy (혈관내 방사선치료를 위한 이론적 선원 설계 및 선량적 관점에서의 적합성 연구: 출력변조를 이용한 근접치료에 대한 제안)

  • Kim Siyong;Han Eunyoung;Palta Jatinder R.;Ha Sung W.
    • Radiation Oncology Journal
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    • v.21 no.2
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    • pp.158-166
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    • 2003
  • Purpose: To propose a conceptual design of a novel source for intensity modulated brachytherapy. Materials and Methods: The source design incorporates both radioactive and shielding materials (stainless steel or tungsten), to provide an asymmetric dose intensity in the azimuthal direction. The intensity modulated intravascular brachytherapy was performed by combining a series of dwell positions and times, distributed along the azimuthal coordinates. Two simple designs for the beta-emitting sources, with similar physical dimensions to a $^{90}Sr/Y$ Novoste Beat-Cath source, were considered in the dosimetric feasibility study. In the first design, the radioactive and materials each occupy half of the cylinder and in the second, the radioactive material occupies only a quater of the cylinder. The radial and azimuthal dose distributions around each source were calculated using the MCNP Monte Carlo code. Results: The preliminary hypothetical simulation and optimization results demonstrated the 87$\%$ difference between the maximum and minimum doses to the lumen wall, due to off-centering of the radiation source, could be reduced to less than 7$\%$ by optimizing the azimuthal dwell positions and times of the partially shielded intravascular brachytherapy sources. Conclusion: The novel brachytherapy source design, and conceptual source delivery system, proposed in this study show promising dosimetric characteristics for the realization of intensity modulated brachytherapy in intravascular treatment. Further development of this concept will center on building a delivery system that can precisely control the angular motion of a radiation source in a small-diameter catheter.