Supe S J, Supe D S
Strahlentherapie. 1978 Mar;154(3):200-7.
Various methods suggested in literature for estimating the ret dose for brachytherapy treatments do not provide unique answers to treatment scheduling problems. These schemes are reviewed with the aim to find out the cause of disparity and to suggest the most consistent system. The variability of the various schemes with the variations of the exponent of time is studied and the CRE system with its minimum variation is advocated for use in solving brachytherapy treatment scheduling problems. The average value of the exponent of time and the corresponding normalizing constant is used to evaluate CRE for brachytherapy fro various dose rates with increasing periods of treatments. Use of the CRE for solving treatment scheduling problems is simplified by providing ready made estimation of CRE for various dose rates and treatment times. A nomogram is devised which gives CRE values for various values of exponent of time.
文献中提出的用于估算近距离放射治疗剂量的各种方法，并不能为治疗计划问题提供唯一答案。对这些方案进行了综述，旨在找出差异的原因，并提出最一致的系统。研究了各种方案随时间指数变化的变异性，并提倡使用变异性最小的CRE系统来解决近距离放射治疗计划问题。利用时间指数的平均值和相应的归一化常数，对不同剂量率、治疗时间增加的近距离放射治疗的CRE进行评估。通过提供各种剂量率和治疗时间的CRE现成估计值，简化了使用CRE解决治疗计划问题的过程。设计了一种列线图，可给出不同时间指数值的CRE值。
