title: Patient position reproducibility in fractionated stereotactic radiotherapy: an update after changing dental impression material.
abstract: The reproducibility of patient positioning within the Gill-Thomas-Cosman relocatable stereotactic frame was re-evaluated following the substitution of a new, softer, dental impression material for the original hard acrylic compound. The average total displacement for a series of 10 patients was 1.1 mm (+/- 0.6 mm). Rotational discrepancies were small. This technique cannot deliver accurate repositioning in the absence of patient co-operation.
authors.affiliation: Physics Department, the Royal Marsden NHS Trust, London, UK.
authors.forename: I
authors.initials: I
authors.lastname: Rosenberg
authors.forename: H
authors.initials: H
authors.lastname: Alheit
authors.forename: C
authors.initials: C
authors.lastname: Beardmore
authors.forename: K S
authors.initials: KS
authors.lastname: Lee
authors.forename: A P
authors.initials: AP
authors.lastname: Warrington
authors.forename: M
authors.initials: M
authors.lastname: Brada
mesh_terms: D000180:Acrylic Resins; D003760:Dental Impression Materials; D019583:Dose Fractionation, Radiation; D006801:Humans; D009369:Neoplasms / Q000532:radiotherapy; D011187:Posture; D015203:Reproducibility of Results; D013238:Stereotaxic Techniques / Q000295:instrumentation*
chemical_list: D000180:Acrylic Resins; D003760:Dental Impression Materials