Wrede D E, Dawalibi H
Acta Radiol Oncol. 1980;19(1):37-40. doi: 10.3109/02841868009130133.
A simple mathematical algorithm is derived from experimental data for dose rates from 137Cs sources in a finite tissue equivalent medium corresponding to the female pelvis. An analytical expression for a point source of 137Cs along with a simple numerical integration routine allows for rapid as well as accurate dose rate calculations at points of interest for gynecologic insertions. When compared with theoretical models assuming an infinite unit density medium, the measured dose rates are found to be systematically lower at distances away from a single source; 5 per cent at 2 cm and 10 per cent at 7 cm along the transverse axis. Allowance in the program for print out of dose rates from individual sources to a given point and the feature of source strength modification allows for optimization in terms of increasing the difference in dose rate between reference treatment points and sensitive structures such as the bladder, rectum and colon.
从对应于女性骨盆的有限组织等效介质中137Cs源的剂量率实验数据推导出一种简单的数学算法。137Cs点源的解析表达式以及简单的数值积分程序允许在妇科插入感兴趣点处快速且准确地计算剂量率。与假设无限单位密度介质的理论模型相比，发现在离单个源一定距离处测量的剂量率系统地更低；在横轴上，2厘米处低5%，7厘米处低10%。程序中允许打印从各个源到给定点的剂量率，以及源强度修改功能，使得能够在增加参考治疗点与诸如膀胱、直肠和结肠等敏感结构之间的剂量率差异方面进行优化。
