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Radiation Protection Dosimetry Advance Access published online on February 3, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/nci762
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Leuvens Special Issue Article

PERFORMANCE EVALUATION AND TESTING OF DIGITAL INTRA-ORAL RADIOGRAPHIC SYSTEMS

P. Doyle 1 * and L. Finney 1

1 Health Physics, Department of Clinical Physics and Bio-Engineering, Gartnavel Royal Hospital, Glasgow G12 OXH, UK

* To whom correspondence should be addressed.
P. Doyle, E-mail: philip.doyle{at}northglasgow.scot.nhs.uk


  Abstract

Four digital intra-oral radiographic systems were tested and evaluated; three charge-coupled device (CCD) based systems from RVG, Visualix and Sidexis and a photostimulable phosphor (PSP) system from DenOptix. Image quality was assessed using three purpose-built phantoms to measure uniformity, low contrast detail detectability and signal-to-noise ratio (SNR). Limiting resolution was measured using a 20 lp mm-1 bar pattern. Radiation output inaccuracies caused difficulties in achieving optimum doses for CCD systems. However, the accuracy was improved by using K-edge filters. SNR measurements proved to be a useful tool in assessing system performance. Each system has specific attributes: resolution was highest for the RVG system, the Visualix system measured the highest SNR and the lowest exposure settings were on the Sidexis system. Test methods and phantoms developed are suitable for acceptance testing and commissioning digital dental X-ray systems and for programming each system to produce an optimum level of image quality.


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