Monte Carlo-aided dosimetry of the new Bebig IsoSeed 103Pd interstitial brachytherapy seed.

Monte Carlo-aided dosimetry of the new Bebig IsoSeed 103Pd interstitial brachytherapy seed.
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新型 Bebig IsoSeed 103Pd 间质近距离放射治疗种子的蒙特卡罗辅助剂量测定。

DOI:
10.1118/1.1395035
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发表时间:
2001
期刊:
影响因子:
3.8
通讯作者:
Williamson,JF
Williamson,JF
中科院分区:
医学3区
文献类型:
--
作者:
Daskalov,GM;Williamson,JF

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BEBIG Isotopentechnik and Umwell诊断公司最近推出了一种新型组织间近距离放射治疗源IsoSeed®,用于永久植入应用。这项研究首次提出了种子剂量量的定量理论研究。蒙特卡罗光子输运(MCPT)模拟技术已经被用来评估液态水和空气模中IsoSeed®模型源周围的剂量率分布。这些结果已被用来计算和制表各向异性函数、径向剂量函数和各向异性因子,以及由AAPM任务组43(TG-43)报告定义的剂量率常数。给出了种子周围0.1-3厘米范围内水中每单位空气比释动能强度的笛卡尔“远离”表和“沿”表也被列了表。为实现低能光子近距离治疗源空气比释动能强度的基本标准,通过模拟美国国家标准与技术研究所最近实施的广角自由空气腔的刻度几何,估算了剂量率常数Λ。剂量率常数为Λ=0.660±0.017,单位空气比释动能剂量率单位(cGyGyh⋅h−1⋅U−1)。
A new model interstitial brachytherapy source, the IsoSeed®was recently introduced by Bebig Isotopentechnik und Umweltdiagnostik GmbH for permanent implant applications. This study presents the first quantitative theoretical study of the seed's dosimetric quantities. Monte Carlo photon transport (MCPT) simulation techniques have been used to evaluate the dose‐rate distributions around the model IsoSeed®source in liquid water and air phantoms. These results have been used to calculate and tabulate the anisotropy function, radial dose function, and anisotropy factors, and dose‐rate constant as defined by AAPM Task Group 43 (TG‐43) Report. Cartesian “away” and “along” tables, giving the dose rates per unit air‐kerma strength in water in the range 0.1–3 cm distance around the seed have also been tabulated. The dose‐rate constant, Λ, was evaluated by simulating the wide‐angle, free‐air chamber (WAFAC) calibration geometry recently implemented by NIST (National Institute of Standards and Technology) to realize the primary standard of air‐kerma strength for low‐energy photon‐emitting brachytherapy sources. The dose‐rate constant has been found to be Λ=0.660±0.017 in units of dose‐rate per unit air‐kerma strength (cGy⋅h−1⋅U−1).
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发表时间: 2000
期刊: Medical physics
影响因子: 3.8
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