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[Effect on dose owing to source displacement in coronary endovascular brachytherapy]
Zhi-yong Xu1, Liang-an Zhang, Shu-yu Yuan
1Institute of Radiation Medicine, CAMS, PUMC, Tianjin 300192, China. xzyong12@vip.sina.com
Objective:
To investigate the effect on the dose distribution of source position displacement with the target region margin in catheter-based 192Ir line source endovascular brachytherapy.
Method:
Dose rate distribution along longitudinal axes was estimated by the formula recommended by AAPM No.60 and No. 43.
Results:
In the two cases of source displacement (1.1 and 5 mm) doses of target region margin was decreased dramatically (at most 53.9% and 565.8% respectively) were compared to that of no source displacement, and the affected range was 6 mm and 9 mm respectively.
Conclusion:
Source displacement will lead to the decrease of dose in target region margin.