title: Radiation field feature of 188Re esophageal stent.
abstract: OBJECTIVE
  To evaluate the radiation field feature of Re esophageal stent and provide scientific basis for clinical application.
  
  
  METHODS
  We measure the beta-ray, gamma-ray and bremssfrahlung dose of every selected point on the bionics esophageal stent and then draw out computer software by mathematical formula.
  
  
  RESULTS
  The radiation field of Re esophageal stent has its own feature: the max range of beta-ray is 11 mm, 90% dose construction field is within 1.5 mm, 95% dose range is within 2.5 mm, and only 4.21% of total energy of gamma-ray and bremssfrahlung is out of 6.5 mm range. The absorption dose of every direction in same point of the esophageal model was similar (P>0.05).
  
  
  CONCLUSIONS
  Beta ray is the major radiation of Re esophageal stent while gamma-ray and bremssfrahlung are 4.21% among the radiation field. The max dose construction field is within 0.5-1.5 mm, just short at the depth of esophagus mucosa within 0.5-1.5 mm range. So Re stent is a good choice of palliative intracavitary radiotherapy of esophageal carcinoma.
authors.affiliation: Department of Radiotherapy, Soochou University, Wuxi, China. wxchujianjun@yahoo.com.cn
authors.forename: Jianjun
authors.initials: J
authors.lastname: Chu
authors.forename: Jianrong
authors.initials: J
authors.lastname: Jin
authors.forename: Shengfa
authors.initials: S
authors.lastname: Ni
authors.forename: Fuzhen
authors.initials: F
authors.lastname: Zhang
authors.forename: Difei
authors.initials: D
authors.lastname: Zhao
authors.forename: Mingzhi
authors.initials: M
authors.lastname: Wang
authors.forename: Liang
authors.initials: L
authors.lastname: Sun
mesh_terms: D001918:Brachytherapy / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D004947:Esophagus / Q000601:surgery*; D011874:Radiometry / Q000379:methods*; D011879:Radiotherapy Dosage; D015607:Stents