Document Detail

Surface laser scanning to routinely produce casts for patient immobilization during radiotherapy.
MedLine Citation:
PMID:  17419860     Owner:  NLM     Status:  MEDLINE    
Immobilization casts are used to reduce patient movement during the radiotherapy of head and neck and brain malignancies. Polyethylene-based casts are produced by first taking a Plaster of Paris 'negative' impression of the patient. A 'positive' mould is then made, which is used to vacuum form an immobilization cast. Taking the 'negative' cast can be messy, stressful for patients and labour intensive. Recently, lightweight hand-held laser surface scanners have become available. These allow an accurate 3-D representation of objects to be generated non-invasively. This technology has now been applied to the production of casts for radiotherapy. Each patient's face and head is digitized using the Polhemus FastSCAN (Polhemus, Colchester, VT, USA) scanner. The electronic data are transferred to a computer numerical controlled mill, where a positive impression is machined. The feasibility of the process was examined, the labour required and radiation therapists' satisfaction with aspects of the produced masks assessed. The scanner-based method of mask production was found to be simple, accurate and non-invasive. There was a reduction in radiation therapist labour required. Masks produced with the scanner-based method were reported to result in improved mask fitting, daily reproducibility, patient immobilization and patient comfort.
B McKernan; S A Bydder; T Deans; M A Nixon; D J Joseph
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Australasian radiology     Volume:  51     ISSN:  0004-8461     ISO Abbreviation:  Australas Radiol     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-04-10     Completed Date:  2007-06-28     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0047441     Medline TA:  Australas Radiol     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  150-3     Citation Subset:  IM    
Department of Radiation Oncology, Sir Charles Gairdner Hospital, Perth, Western Australia, Australia.
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MeSH Terms
Computer-Aided Design
Equipment Design
Feasibility Studies
Head and Neck Neoplasms / radiotherapy*
Radiotherapy / instrumentation*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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