Ezzell G A
Gershenson Radiation Oncology Center, Karmanos Cancer Institute and Wayne State University, Detroit, Michigan 48201, USA.
Med Phys. 2000 Jan;27(1):151-3. doi: 10.1118/1.598878.
It is useful to expedite high dose rate brachytherapy endobronchial treatments by using standardized dwell weights and worksheets, avoiding computerized planning where possible. Such methods assume the treatment catheter is straight. This study uses inverse-square considerations to quantify the curvature that invalidates the straight-line approximation. The ratio of the distance between end dwell positions and the active length can be used as a measure of the curvature. The variation in mean dose and maximum dose at the prescription points is presented as a function of active length and curvature, allowing the planner to determine quickly when a pre-treatment computer plan is necessary.
通过使用标准化的驻留权重和工作表来加快高剂量率近距离放射治疗支气管内治疗是有用的，尽可能避免使用计算机化规划。这些方法假定治疗导管是直的。本研究使用平方反比考虑因素来量化使直线近似无效的曲率。末端驻留位置之间的距离与有效长度的比值可作为曲率的度量。处方点处平均剂量和最大剂量的变化表示为有效长度和曲率的函数，使规划者能够快速确定何时需要进行治疗前计算机计划。
