Document Detail

Alternative X-ray filters for an intra-oral digital radiographic system.
MedLine Citation:
PMID:  22282509     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The aim of this study was to evaluate the effect of the modulation of the radiation spectrum with the use of alternative X-ray filters in the quality of intra-oral digital images from storage phosphor plates.
METHODS: The radiographic exposures were performed in a GE 1000 X-ray machine (General Electric Co., Milwaukee, WI), operating at 65 kVp, 10 mA, 40 cm focus receptor distance using three different exposure times: 0.05 s, 0.16 s and 0.35 s. The control filter (GC) was 100% aluminium (Al) with a thickness of 1.5 mm. The tested filters were: G1, 97% Al and 3% copper (Cu) with 1.47 mm thickness; G2, 96% Al and 4% Cu with 1.53 mm thickness; G3, 95% Al and 5% zinc (Zn) with 1.56 mm thickness; G4, 98% Al and 2% Zn with 1.5 mm thickness; and G5, 95% Cu and 5% Zn with 1.6 mm thickness. For formation of the image, a 12-step Al wedge (each step with increments of 1 mm in thickness) was radiographed 10 times. Pixel values measured in digital images were converted into optical density (OD).
RESULTS: All replicates showed OD with high reproducibility (r > 0.95) for all exposure times and tested filters. In comparison between filters, statistically significant differences in density (p < 0.05) were observed. The OD curve of the G5 filter in all exposure times and G3 filter in an exposure time of 0.05 s showed changes in shape (p < 0.05).
CONCLUSIONS: Excluding the G5 filter, all others tested filters can be used as a substitute for GC without losses in image quality.
J Stecke; A D Cruz; S M Almeida; F N Bóscolo
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Publication Detail:
Type:  Journal Article     Date:  2012-01-26
Journal Detail:
Title:  Dento maxillo facial radiology     Volume:  41     ISSN:  0250-832X     ISO Abbreviation:  Dentomaxillofac Radiol     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-06-18     Completed Date:  2012-09-20     Revised Date:  2013-07-02    
Medline Journal Info:
Nlm Unique ID:  7609576     Medline TA:  Dentomaxillofac Radiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  361-6     Citation Subset:  D    
Piracicaba Dental School of the State University of Campinas, Sao Paulo, Brazil.
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MeSH Terms
Equipment Design
Radiographic Image Interpretation, Computer-Assisted
Radiography, Dental, Digital / instrumentation*
Regression Analysis
X-Ray Intensifying Screens
Reg. No./Substance:
7429-90-5/Aluminum; 7440-50-8/Copper; 7440-66-6/Zinc

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

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