Document Detail

Strict X-ray beam collimation for facial bones examination can increase lens exposure.
MedLine Citation:
PMID:  22374279     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: It is well accepted that collimation is a cost-effective dose-reducing tool for X-ray examinations. This phantom-based study investigated the impact of X-ray beam collimation on radiation dose to the lenses of the eyes and thyroid along with the effect on image quality in facial bone radiography.
METHODS: A three-view series (occipitomental, occipitomental 30 and lateral) was investigated, and radiation doses to the lenses and thyroid were measured using an Unfors dosemeter. Images were assessed by six experienced observers using a visual grading analysis and a total of 5400 observations were made.
RESULTS: Strict collimation significantly (p<0.0001) reduced the radiation dose to the lenses of the eyes and thyroid when using a fixed projection-specific exposure. With a variable exposure technique (fixed exit dose, to simulate the behaviour of an automatic exposure control), while strict collimation was again shown to reduce thyroid dose, higher lens doses were demonstrated when compared with larger fields of exposure. Image quality was found to significantly improve using strict collimation, with observer preference being demonstrated using visual grading characteristic curves.
CONCLUSION: The complexities of optimising radiographic techniques have been shown and the data presented emphasise the importance of examining dose-reducing strategies in a comprehensive way.
R Powys; J Robinson; P L Kench; J Ryan; P C Brennan
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Publication Detail:
Type:  Journal Article     Date:  2012-02-28
Journal Detail:
Title:  The British journal of radiology     Volume:  85     ISSN:  1748-880X     ISO Abbreviation:  Br J Radiol     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-07-20     Completed Date:  2012-10-01     Revised Date:  2013-08-14    
Medline Journal Info:
Nlm Unique ID:  0373125     Medline TA:  Br J Radiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  e497-505     Citation Subset:  AIM; IM    
Discipline of Medical Radiation Sciences, Faculty of Health Sciences, University of Sydney, Sydney, NSW, Australia.
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MeSH Terms
Analysis of Variance
Facial Bones / radiography*
Lens, Crystalline / radiation effects*
Organs at Risk / radiation effects*
Phantoms, Imaging
Radiation Dosage
Reference Standards
Thyroid Gland / radiation effects

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