title: [Clinical implementation of dose reconstruction and dose-guided intensity modulated radiotherapy for helical tomotherapy].
abstract: OBJECTIVE
  To implement dose reconstruction and dose-guided intensity modulated radiotherapy for helical tomotherapy.
  
  
  METHODS
  Dose reconstruction was implemented on adaptive helical tomotherapy with the online megavoltage CT (MVCT) imaging from a patient with nasopharyngeal cancer. The differences of isodose line between actual and planned deposition were analysis in 3D distribution, on which the hot spot and cold spot were lined. The dose delivered to these areas was modulated in later fractions to keep the planned requirement.
  
  
  RESULTS
  The differences between actual and planned isodose line were shown on the image visually. The modulation to the hot spot and cold spot in later fraction corrected the incorrectly delivered dose to achieve the requirement of primary plan.
  
  
  CONCLUSIONS
  The dose reconstruction and dose-guided intensity modulated radiotherapy can be implemented in adaptive helical tomotherapy.
authors.affiliation: Department of Radiation Oncology, Chinese PLA General Hospital, Beijing, China. yaoweirong2901@126.com
authors.forename: Weirong
authors.initials: W
authors.lastname: Yao
authors.forename: Shouping
authors.initials: S
authors.lastname: Xu
authors.lastname: Du Lei
authors.forename: Chuanbin
authors.initials: C
authors.lastname: Xie
authors.forename: Lin
authors.initials: L
authors.lastname: Ma
mesh_terms: D006801:Humans; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D050397:Radiotherapy, Intensity-Modulated / Q000379:methods*; D036542:Tomography, Spiral Computed / Q000379:methods*