Document Detail


Isocentric rotational performance of the Elekta Precise Table studied using a USB-microscope.
MedLine Citation:
PMID:  21098925     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The isocentric three-dimensional performance of the Elekta Precise Table was investigated. A pointer was attached to the radiation head of the accelerator and positioned at the geometric rotational axis of the head. A USB-microscope was mounted on the treatment tabletop to measure the table position relative to the pointer tip. The table performance was mapped in terms of USB-microscope images of the pointer tip at different table angles and load configurations. The USB-microscope was used as a detector to measure the pointer tip positions with a resolution down to 0.01 mm. A new elastic model of the treatment table was developed. This model describes the performance of the treatment table quite well except from some deviations due to backlash effects. Geometric and elastic features are described through six parameters. These parameters are calculated using the linear least squares fitting technique. A new method to ensure optimal positioning of the table relative to the accelerator is presented. This method cannot eliminate systematic errors completely. To eliminate systematic errors we suggest that geometric and elastic models of the table and accelerator gantry arm are incorporated in the dose planning system.
Authors:
Hans L Riis; Sune J Zimmermann; Poul Riis
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Publication Detail:
Type:  Journal Article     Date:  2010-11-22
Journal Detail:
Title:  Physics in medicine and biology     Volume:  55     ISSN:  1361-6560     ISO Abbreviation:  Phys Med Biol     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-12-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401220     Medline TA:  Phys Med Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  7597-614     Citation Subset:  IM    
Affiliation:
Radiofysisk Laboratorium, Odense University Hospital, Sdr. Boulevard 29, DK-5000 Odense C, Denmark.
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