title: [Comparison of set-up control for head and neck patients between radiation oncologist and therapists with the aim of partial delegation].
abstract: OBJECTIVE
  The aim of this prospective study was to evaluate daily set-up by a radiation oncologist and by radiation therapists using on-board imaging of patients with head and neck cancer in order to calculate margin to PTV (planning target volume) and intent partial delegation of positioning images control.
  
  
  METHODS
  The files of 11 patients with head and neck cancer treated on a Synergy™ (Elekta™) accelerator with on-board imaging system were evaluated. Daily kV-kV images were double-blind reviewed by radiation therapists (7 participants) and by one radiation oncologist. The radiation oncologist's measures were used for margin calculation from CTV to PTV. The difference of measures and the concordance of decisions between radiation therapists and the radiation oncologist were calculated.
  
  
  RESULTS
  The 325 measures made by the radiation oncologist resulted in a margin of 5mm to be applied to the CTV in each direction. Nine hundred seventy-seven measures were made by the radiation oncologist and radiation therapists with a difference of 3mm or less in 98.46%. The concordance of decision for a 4mm difference or less to the isocenter was 96.7%.
  
  
  CONCLUSIONS
  This study confirms the 5mm PTV margin mostly used in ORL. The small gap between the radiation oncologist's and therapists' measures allows a partial delegation of positioning images control.
authors.affiliation: Service de radiothérapie, hôpital Robert-Boulin, 112, rue de la Marne, 33505 Libourne cedex, France. Electronic address: muriel.garcia-ramirez@ch-libourne.fr.
authors.forename: M
authors.initials: M
authors.lastname: Garcia-Ramirez
authors.affiliation: Service de radiothérapie, hôpital Robert-Boulin, 112, rue de la Marne, 33505 Libourne cedex, France.
authors.forename: S
authors.initials: S
authors.lastname: Maugey
authors.affiliation: Service de radiothérapie, hôpital Robert-Boulin, 112, rue de la Marne, 33505 Libourne cedex, France.
authors.forename: L
authors.initials: L
authors.lastname: Burgaud
authors.affiliation: Service de radiothérapie, hôpital Robert-Boulin, 112, rue de la Marne, 33505 Libourne cedex, France.
authors.forename: F
authors.initials: F
authors.lastname: Carpentey
authors.affiliation: Service de radiothérapie, hôpital Robert-Boulin, 112, rue de la Marne, 33505 Libourne cedex, France.
authors.forename: E
authors.initials: E
authors.lastname: Parezys
authors.affiliation: Service de radiothérapie, hôpital Robert-Boulin, 112, rue de la Marne, 33505 Libourne cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Carricaburu
mesh_terms: D002277:Carcinoma / Q000000981:diagnostic imaging / Q000532:radiotherapy; D003657:Decision Making; D004311:Double-Blind Method; D006258:Head and Neck Neoplasms / Q000000981:diagnostic imaging / Q000532:radiotherapy*; D006801:Humans; D015588:Observer Variation; D058958:Organs at Risk; D010315:Particle Accelerators; D056888:Patient Positioning; D032024:Personnel Delegation; D011446:Prospective Studies; D018787:Radiation Oncology; D011859:Radiography; D011880:Radiotherapy Planning, Computer-Assisted; D013679:Technology, Radiologic
keywords: Image-guided radiotherapy (IGRT); Manipulateurs en électroradiologie; Partage des tâches; Patient positioning; Positionnement du patient; Radiation therapists; Radiothérapie guidée par l’image (IGRT); Tasks sharing