title: [The application of external fixator in CT guided ¹²⁵I Seeds implantation to treat head and neck neoplasms].
abstract: OBJECTIVE
  To investigate the effect of external fixator in posture fixation during the interstitial of ¹²⁵I seeds implantation for head and neck cancer under CT guidance.
  
  
  METHODS
  20 cases of head and neck cancer patients with CT guided radioactive ¹²⁵I particle implantation were enrolled. 10 patients of group A for external fixator, the other 10 of group B used conventional bind belt. Spiral CT scanning was performed with 5 mm slices, and we chose the first and last serial CT images during the operation for image fusion with automatic registration software, then we could get 3D displacement errors.
  
  
  RESULTS
  Patients in group A of X, Y, Z axis position deviation were 1.06 cm, 1.22 cm and 1.22 cm , respectively. As to group B, they were 8.76 cm (P = 0.041), 9.99 cm (P = 0.009) and 0.009 cm (P = 0.023), respectively.
  
  
  CONCLUSIONS
  The external fixator could applied in the treatment of head and neck cancer during CT-guided ¹²⁵I seed implantation, which fixed well in the operation, more comfortable, improve the positioning accuracy and reduce the extra rescanning radiation doses.
authors.affiliation: Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China.
authors.forename: Jinghong
authors.initials: J
authors.lastname: Fan
authors.affiliation: Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Lin
authors.affiliation: Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China. Email: junjiewang_edu@sina.cn.
authors.forename: Junjie
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China.
authors.forename: Na
authors.initials: N
authors.lastname: Meng
authors.affiliation: Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China.
authors.forename: Ziyi
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China.
authors.forename: Hailin
authors.initials: H
authors.lastname: Yao
mesh_terms: D001918:Brachytherapy; D016267:External Fixators; D006258:Head and Neck Neoplasms; D006801:Humans; D007457:Iodine Radioisotopes; D014057:Tomography, X-Ray Computed
chemical_list: D007457:Iodine Radioisotopes