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本文介绍我院应用电子计算机绘制~(60)Co后装治疗子宫颈癌的盆腔剂量分布图及其计算方法。 一、放射源 我院使用日本Ralstron-20B型高剂量率~(60)Co后装治疗机。~(60)Co源单元为每边1mm之小立方体,每粒含放射性1Ci左右。阴道球用点源,左右阴道球各含~(60)Co珠两粒,粒间无间隔。宫腔管源含~(60)Co珠4粒,每两粒间隔2.5mm,组成有效长度为11.5mm的线状源。治疗时,阴道球点源的位置是固定的。而宫腔管线源的位置可作分段移动,移动次数(长度)视子宫大小及病变而定。 放射源的组织吸收剂量率见表1、2。剂量值为该治疗
This article describes the application of computer-based computer in our hospital to draw ~ (60) Co after the treatment of cervical cancer pelvic dose distribution and calculation methods. First, the radioactive sources in our hospital using Japan Ralstron-20B high dose rate ~ (60) Co after treatment machine. ~ (60) Co source cells are small cubes with 1mm on each side, each containing about 1Ci radioactivity. Vaginal ball with point source, left and right vaginal balls containing ~ (60) Co beads two, no interval between the particles. Uterine tube containing ~ (60) Co beads 4, each interval of 2.5mm, composed of a linear length of 11.5mm effective source. Treatment, the location of the vaginal ball point source is fixed. The location of the uterine line source can be used for segmented movement, the number of movements (length) depends on the size and lesion of the uterus may be. Tissue absorbed dose rates for radioactive sources are shown in Tables 1 and 2. The dose is the treatment