125I seed fixity after implantation in parotid region / 中华放射医学与防护杂志

ABSTRACT

Objective To observe the fixity of 125I seed after implantation in parotid region. Methods Ten patients treated with 125I seed interstitial brachytherapy in parotid were randomly selected. Within one week after the treatment, two plane radiographs were taken by radiotherapy simulator and 125I seed was counted. All plane dosimetry analysis were performed by treatment planning system. The areas surrounded by 50%, 100% and 150% of prescription dose curve and dose equality index were calculated. Two months after the treatment, the same examination were repeated and were compared with t test. Results The number of seeds was equal in two examination. There were no signifieant differences in two examinations either for the areas surrounded by 50%, 100% and 150% of prescription dose curve or for the dose equality index. Conclusions The position of 125I seed after implantation in parotid region is quite fixable, which can ensure the curative effect.