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
中科院分区:
文献类型:
--
作者:
Hedtjärn,H;Carlsson,GA;Williamson,JF
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%.
登录
查看更多内容
DOI:
--
发表时间:
1988
期刊:
影响因子:
--
作者:
L. Rosa;H. Nette
通讯作者:
H. Nette
影响因子:
3.8
作者:
Chiu-Tsao,ST;Anderson,LL;O'Brien,K;Sanna,R
通讯作者:
Sanna,R
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
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