Monte Carlo-aided dosimetry of the Symmetra model I25.S06 125I, interstitial brachytherapy seed.

Monte Carlo-aided dosimetry of the Symmetra model I25.S06 125I, interstitial brachytherapy seed.
复制标题

Symmetra 型号 I25.S06 125I 间质近距离放射治疗种子的蒙特卡罗辅助剂量测定。

DOI:
10.1118/1.598990
复制
发表时间:
2000
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:
Hedtjärn,H;Carlsson,GA;Williamson,JF

文献摘要

参考文献

被引文献

相似文献

采用Monte Carlo光子输运计算,对永久性前列腺植入物的新型种子(I25.S06型Symmetra种子)进行了剂量测定研究。已计算AAPM任务组43(TG-43)报告推荐的所有剂量测定量。确定了剂量率常数、径向剂量函数、各向异性函数、各向异性因子和各向异性常数。考虑了最近(1999年1月)修订的NIST(美国国家标准与技术研究所)空气比释动能强度校准标准以及更新的相互作用截面数据。为了进行比较,对竞争产品6702型源进行了计算。对于Symmetra和6702型粒子,两种粒子的计算剂量率常数分别为1.010和1.016 cGyh−1U− 1。后一个值偏离了TG-43报告中推荐的值1.039 cGyh−1U−1。Symmetra新粒子的径向剂量函数计算值比6711型粒子的径向剂量函数更具穿透性(在5 cm距离处增加20%),但在10 cm距离处与6702型粒子的径向剂量函数非常一致(在统计误差范围内)。晶种的各向异性函数也接近于6702晶种的各向异性函数,具有稍微更明显的各向异性趋势(在与纵轴成小角度时的值较低)。与型号6711种子相比,Symmetra新种子的各向同性更强。三种种子模型的各向异性常数(相对于角度和距离平均的各向异性函数)在2%以内。
A dosimetric study of a new seed for permanent prostate implant, the Symmetra Seed model I25.S06, has been undertaken utilizing Monte Carlo photon transport calculations. All dosimetric quantities recommended by the AAPM Task Group 43 (TG‐43) report have been calculated. Quantities determined are dose rate constant, radial dose function, anisotropy function, anisotropy factor, and anisotropy constant. The recently (January 1999) revised NIST (National Institute of Standards and Technology) standard for air kerma strength calibration was taken into account as well as updated interaction cross‐section data. Calculations were done for the competing model 6702 source for the purpose of comparison. The calculated dose‐rate constants for the two seeds are 1.010 and 1.016 cGyh−1U−1for the Symmetra and model 6702 seeds, respectively. The latter value deviates from the value, 1.039 cGyh−1U−1, recommended in the TG‐43 report. The calculated radial dose function for the Symmetra new seed is more penetrating than that of the model 6711 seed (by 20% at 5 cm distance) but agrees closely (within statistical errors) with that of the model 6702 seed up to distances of 10 cm. The anisotropy function for the seed is also close to that for the 6702 seed with a tendency of somewhat more pronounced anisotropy (lower values at small angles from the longitudinal axis). Compared to the model 6711 seed, the Symmetra new seed is more isotropic. The anisotropy constants (the anisotropy function averaged with respect to angle and distance) for the three seed models are within 2%.
用于未知光谱分布的 γ 或 x 辐射场中暴露评估的热释光剂量计
DOI: --
发表时间: 1988
期刊:
影响因子: --
作者:
L. Rosa;H. Nette
通讯作者: H. Nette
125I 种子的剂量率测定。
DOI: 10.1118/1.596586
发表时间: 1990
期刊: Medical physics
影响因子: 3.8
作者:
Chiu-Tsao,ST;Anderson,LL;O'Brien,K;Sanna,R
通讯作者: Sanna,R
测量暴露校准的 125I 种子的剂量率。
DOI: --
发表时间: 1990
期刊: International Journal of Radiation Oncology, Biology, Physics
影响因子: --
作者:
G. Luxton;M. Astrahan;David O. Findley;Zbigniew Petrovich
通讯作者: Zbigniew Petrovich
用于辐射传输计算的基于体积的几何建模。
DOI: 10.1118/1.596810
发表时间: 1992
期刊: Medical physics
影响因子: 3.8
作者:
Li,Z;Williamson,JF
通讯作者: Williamson,JF
DOI: --
发表时间: 1998
期刊: Medical Physics (Lancaster)
影响因子: --
作者:
J. Williamson;B. Coursey;L. Dewerd;W. Hanson;R. Nath
通讯作者: R. Nath