title: Measurement techniques, modeling strategies and pitfalls to avoid when implementing a mini MLC in a non dedicated planning system.
abstract: OBJECTIVE
  Ghent University Hospital investigated the feasibility of the Pinnacle system for planning intracranial stereotactic treatments. The aim was to perform precise dose computation using the collapsed cone engine for treatment delivery with the Moduleaf mini-MLC mounted on an Elekta accelerator.
  
  
  METHODS
  The Moduleaf was commissioned using dose rate corrected data recorded by a diamond detector and using data measured by cylindrical chambers each limited to restricted field sizes.
  
  
  RESULTS
  Automatic modeling resulted in clinical relevant dose errors up to 10%. Using manual modeling in Pinnacle, for clinical applicable fields a 2%/2 mm agreement between modeled data and measurements was obtained.
  
  
  CONCLUSIONS
  The overall accuracy of the collapsed cone algorithm is within tolerances for single fraction stereotactic treatments.
authors.affiliation: Department of Radiotherapy, Ghent University Hospital, 185 De Pintelaan, B-9000, Ghent, Belgium. geert@krtkg1.ugent.be
authors.forename: Geert
authors.initials: G
authors.lastname: Pittomvils
authors.forename: Marc
authors.initials: M
authors.lastname: Coghe
authors.forename: Werner
authors.initials: W
authors.lastname: De Gersem
authors.forename: Frederik
authors.initials: F
authors.lastname: Crop
authors.forename: Bart
authors.initials: B
authors.lastname: Van Duyse
authors.forename: Filip
authors.initials: F
authors.lastname: Jacobs
authors.forename: Carlos
authors.initials: C
authors.lastname: De Wagter
authors.forename: Wilfried
authors.initials: W
authors.lastname: De Neve
mesh_terms: D000465:Algorithms; D005240:Feasibility Studies; D006801:Humans; D019047:Phantoms, Imaging; D011874:Radiometry / Q000379:methods; D016634:Radiosurgery; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000295:instrumentation / Q000379:methods*