Document Detail

The performance of multileaf collimators evaluated by the stripe test.
MedLine Citation:
PMID:  19647629     Owner:  NLM     Status:  MEDLINE    
The performance of 3 multileaf collimator (MLC) systems (Varian Medical Systems, Elekta, and Siemens Medical Solutions) mounted on 7 different radiotherapy linear accelerators was investigated by a stripe test. The stripe test consisted of 8 adjacent multileaf segments of 2.5 x 40 cm(2), enclosed by all leaf pairs. With 6-MV photons, the segments were used to irradiate Agfa CR films. The optical density profile of the irradiated film in the travel direction of the MLC was used to estimate the short- and long-term leaf positioning reproducibility. The short-term reproducibility was found by analyzing 6 consecutive stripe tests. The long-term reproducibility was obtained by performing 3 to 5 stripe tests over 2 months. The short-term reproducibility was mainly within 0.3 mm for all systems. For the long-term reproducibility, the Varian and Elekta MLCs were within 0.4 to 0.5 mm, while the Siemens MLC showed a wider distribution, with values up to 1 mm for some leaf pairs. The inferior long-term reproducibility of the Siemens MLCs was mainly due to a decrease of the segment size with time. In conclusion, the stripe test is a useful method for evaluating MLC performance. Furthermore, the long-term reproducibility varied among the MLC systems investigated.
Maria Sastre-Padro; Christoffer Lervåg; Karsten Eilertsen; Eirik Malinen
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article     Date:  2008-09-21
Journal Detail:
Title:  Medical dosimetry : official journal of the American Association of Medical Dosimetrists     Volume:  34     ISSN:  1873-4022     ISO Abbreviation:  Med Dosim     Publication Date:  2009  
Date Detail:
Created Date:  2009-08-03     Completed Date:  2009-10-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8908862     Medline TA:  Med Dosim     Country:  United States    
Other Details:
Languages:  eng     Pagination:  202-6     Citation Subset:  IM    
Department of Medical Physics, Division of Cancer Medicine and Radiotherapy, Rikshospitalet University Hospital, Oslo, Norway.
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MeSH Terms
Equipment Design
Equipment Failure Analysis / instrumentation*
Film Dosimetry*
Particle Accelerators / instrumentation*
Radiotherapy Dosage
Radiotherapy, Conformal / instrumentation*
Reproducibility of Results
Sensitivity and Specificity

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