title: [Evaluation of setup error and adequate setup margins in patients with prostate cancer treated by IMRT and fixed in the prone position using a set of immobilization devices].
abstract: OBJECTIVE
  Positional reproducibility in patients with prostate cancer fixed in the prone position with a set of immobilization devices for external-beam intensity-modulated radiation therapy (IMRT) was evaluated. In addition, the adequacy of our positional error reduction strategy and current planning target volume (PTV) margins was also evaluated.
  
  
  RESULTS
  Systematic error was corrected by the positional correction that we executed at the first stage of irradiation. The setup margin that we had calculated was 1.1 mm in the L-R direction, 1.3 mm in the A-P direction, and 2.7 mm in the C-C direction.
  
  
  CONCLUSIONS
  We determined that the effectiveness of the method of correcting the error margin and the setup accuracy of the fixed method were well maintained.
authors.affiliation: Clinical Radiology Service, Kyoto University Hospital.
authors.forename: Toru
authors.initials: T
authors.lastname: Takakura
authors.forename: Manabu
authors.initials: M
authors.lastname: Nakata
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Yano
authors.forename: Takashi
authors.initials: T
authors.lastname: Okada
authors.forename: Takahiro
authors.initials: T
authors.lastname: Fujimoto
authors.forename: Kana
authors.initials: K
authors.lastname: Matsubara
authors.forename: Takashi
authors.initials: T
authors.lastname: Mizowaki
authors.forename: Kenji
authors.initials: K
authors.lastname: Takayama
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Norihisa
mesh_terms: D006801:Humans; D008297:Male; D016684:Prone Position / Q000502:physiology*; D011471:Prostatic Neoplasms / Q000532:radiotherapy*; D050397:Radiotherapy, Intensity-Modulated / Q000295:instrumentation* / Q000379:methods*; D015203:Reproducibility of Results; D012149:Restraint, Physical / Q000295:instrumentation*