title: Surface dose measurement for helical tomotherapy.
abstract: OBJECTIVE
  To compare the surface dose measurements made by different dosimeters for the helical tomotherapy (HT) plan in the case of the target close to the surface.
  
  
  METHODS
  Surface dose measurements in different points for the HT plan to deliver 2 Gy to the planning target volume (PTV) at 5 mm below the surface of the cylindrical phantom were performed by radiochromic films, single use metal oxide semiconductor field-effect transistor (MOSFET) dosimeters, silicon IVD QED diode, and optically stimulated luminescence (OSL) dosimeters.
  
  
  RESULTS
  The measured doses by all dosimeters were within 12 +/- 8% difference of each other.
  
  
  CONCLUSIONS
  Radiochromic films, EBT, and EBT2, provide high spatial resolution, although it is difficult to get accurate measurements of dose. Both the OSL and QED measured similar dose to that of the MOSFET detectors. The QED dosimeter is promising as a reusable on-line wireless dosimeter, while the OSL dosimeters are easier to use, require minimum setup time and are very precise.
authors.affiliation: London Regional Cancer Program, London Health Sciences Centre, London, Ontario N6A 4L6, Canada.
authors.forename: Jonatan A
authors.initials: JA
authors.lastname: Snir
authors.forename: Homeira
authors.initials: H
authors.lastname: Mosalaei
authors.forename: Kevin
authors.initials: K
authors.lastname: Jordan
authors.forename: Slav
authors.initials: S
authors.lastname: Yartsev
mesh_terms: D008163:Luminescent Measurements; D019047:Phantoms, Imaging; D011874:Radiometry / Q000295:instrumentation / Q000379:methods*; D011880:Radiotherapy Planning, Computer-Assisted; D011881:Radiotherapy, Computer-Assisted / Q000379:methods*; D013499:Surface Properties; D014173:Transistors, Electronic