title: [Effect on dose owing to source displacement in coronary endovascular brachytherapy].
abstract: 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.
  
  
  METHODS
  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.
  
  
  CONCLUSIONS
  Source displacement will lead to the decrease of dose in target region margin.
authors.affiliation: Institute of Radiation Medicine, CAMS, PUMC, Tianjin 300192, China. xzyong12@vip.sina.com
authors.forename: Zhi-yong
authors.initials: ZY
authors.lastname: Xu
authors.forename: Liang-an
authors.initials: LA
authors.lastname: Zhang
authors.forename: Shu-yu
authors.initials: SY
authors.lastname: Yuan
authors.forename: Guang-fu
authors.initials: GF
authors.lastname: Dai
mesh_terms: D000818:Animals; D001918:Brachytherapy / Q000379:methods*; D023903:Coronary Restenosis / Q000532:radiotherapy*; D003331:Coronary Vessels / Q000528:radiation effects*; D007496:Iridium Radioisotopes / Q000627:therapeutic use*; D011879:Radiotherapy Dosage
chemical_list: D007496:Iridium Radioisotopes