Monte Carlo calculations of AAPM Task Group Report No. 43 dosimetry parameters for the MED3631-A/M125I source.
Monte Carlo calculations of AAPM Task Group Report No. 43 dosimetry parameters for the MED3631-A/M125I source.
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MED3631-A/M125I 源的 AAPM 任务组报告第 43 号剂量测定参数的蒙特卡罗计算。
DOI：
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
M. Rivard
中科院分区：
文献类型：
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作者：
M. Rivard
MED3631-A/M 125I 源的近距离放射治疗剂量测定参数已根据 AAPM 第 43 号任务组 (TG-43) 剂量测定方案确定。这些数据是使用 MCNP4B2 蒙特卡洛辐射传输代码的 *F8 计数与 DLC-189 横截面库计算得出的。由于胶囊内 125I 树脂珠和金铜标记的运动，使用具有“真实”或“理想”位置的珠和标记来检查几何函数、径向剂量函数、剂量率常数和各向异性函数等参数；实际位置是“垂直”和“对角”胶囊方向的加权组合。现实和理想几何形状的剂量率常数 lambda99std（现实）和 lambda99std（理想）分别为 1.066 和 1.067 cGy h(-1) U(-1)，这在 Wallace 和 Fan 测量值的不确定度范围内 [Med。物理。 26, 1925-1931 (1999)] 和 Li 等人。 [医学。物理。 27, 1275-1280 (2000)]，分别为 1.06 和 1.067 cGy h(-1) U(-1)。在 r0= 1 和 theta0= 90 度时计算出的实际源几何形状的参考剂量率比理想源几何形状低 0.7%。现实和理想几何形状的各向异性常数 phian（现实）分别为 0.948 和 0.965。 phian（现实）与 Wallace 和 Fan 测量的（0.941）相匹配，而 phian（理想）与 Wierzbicki 等人计算的（0.948）显着不同。 [医学。物理。 25, 2197-2199 (1998)] 用于理想的 MED3631-A/S 125I 源。
Brachytherapy dosimetry parameters for MED3631-A/M 125I sources have been determined in accordance with the AAPM Task Group No. 43 (TG-43) dosimetry protocol. These data were calculated using the *F8 tally from the MCNP4B2 Monte Carlo radiation transport code with the DLC-189 cross-section libraries. Due to motion of the 125I resin beads and gold-copper markers within the capsule, parameters such as the geometry function, radial dose function, dose rate constant, and anisotropy function were examined with the beads and markers having either "realistic" or "ideal" positions; the realistic position was a weighted combination of "vertical" and "diagonal" capsule orientations. The dose rate constants for the realistic and ideal geometries, lambda99std(realistic) and lambda99std(ideal) were 1.066 and 1.067 cGy h(-1) U(-1), respectively, which were within uncertainties of measured values by Wallace and Fan [Med. Phys. 26, 1925-1931 (1999)] and Li et al. [Med. Phys. 27, 1275-1280 (2000)], 1.06 and 1.067 cGy h(-1) U(-1), respectively. The calculated reference dose rate at r0= 1 and theta0= 90 degrees for the realistic source geometry was 0.7% less than for the ideal source geometry. The anisotropy constants, phian(realistic), for the realistic and ideal geometries were 0.948 and 0.965, respectively. phian(realistic) matched that (0.941) measured by Wallace and Fan, and phian(ideal) was significantly different from that (0.948) calculated by Wierzbicki et al. [Med. Phys. 25, 2197-2199 (1998)] for an ideal MED3631-A/S 125I source.
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。
影响因子：
3.8
作者：
Hedtjärn,H;Carlsson,GA;Williamson,JF
通讯作者：
Williamson,JF