Beach J L, Mendiondo O A, Martin J L
Lexington Radiation Therapy Center, KY 40504.
Int J Radiat Oncol Biol Phys. 1991 Sep;21(4):1053-5. doi: 10.1016/0360-3016(91)90749-t.
A small diameter, single-step afterloading vaginal cylinder has been developed for 137Cs brachytherapy of the vaginal cuff and walls. The Lucite cylinder has an interior slot of rectangular cross section running along its length and opening to the outside of the patient. A single rectangular Lucite insert, containing preselected sources, fits into the slot. Two short sources in the tip form a T with the sources along the vaginal canal and provide a high, uniform dose rate across the spherical tip of the applicator. A catalog of 30 precalculated loadings provides surface dose rates at the tip which vary from 140 to 230 cGy/hr for standard source strengths, as well as a variety of dose rate profiles along the vaginal wall. The applicator is tapered at the base for comfortable and secure placement, and the single-step insertion reduces both patient discomfort and personnel radiation exposure for this procedure.
一种小直径、单步后装阴道施源器已被开发用于阴道断端及阴道壁的铯-137近距离放射治疗。该有机玻璃施源器有一个沿其长度方向延伸且通向患者体外的矩形横截面内部狭槽。一个装有预选放射源的单一矩形有机玻璃插入件可装入该狭槽。尖端的两个短放射源与沿阴道管的放射源形成一个“T”形，并在施源器的球形尖端提供高且均匀的剂量率。一份包含30种预先计算好的装源方案的目录提供了标准源强下尖端表面剂量率在140至230厘戈瑞/小时之间变化，以及沿阴道壁的各种剂量率分布。施源器底部呈锥形以便舒适且稳固地放置，单步插入减少了该操作过程中患者的不适以及工作人员的辐射暴露。
